JP2005102462A - Commutator motor - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide a commutator motor that reduces the occurrence of nasty smell after the occurrence of an excessive spark between a commutator and a brush, the emission of smoke, and firing, and that improves reliability. <P>SOLUTION: This commutator motor is provided with a stator, an armature, a commutator that is coupled to the armature, a brush that feeds electric power to the commutator, a brush sleeve into which the brush is inserted, a holder that holds the brush sleeve, and a detecting element that detects an excessive spark that occurs to the rectification end side of a brush tip. The motor is configured to stop when an excessive spark is detected by the detecting element. <P>COPYRIGHT: (C)2005,JPO&NCIPI

Description

  This invention is, for example, a commutator motor used in a vacuum cleaner, that is, a stator housed and fixed in a bracket, an amateur, a commutator connected to the amateur, and a brush that supplies power to the amateur via the commutator (usually, The present invention relates to a commutator electric motor including a carbon brush), a brush sleeve for inserting a brush, a brush holder for fixing the brush sleeve (simply referred to as a holder in this specification), and the like.

  In the commutator motor, an amateur coil terminal is connected to a commutator including a plurality of commutator pieces whose peripheral portions are arranged in parallel with each other. The amateur is configured to be energized via a brush that is elastically pressed against the commutator by a spring. The commutator is formed in a cylindrical shape by alternately combining commutator pieces and insulating pieces connected to the winding of the amateur. Therefore, in this commutator motor, since the current flowing through the brush is cut between the commutator pieces in the commutator during commutation, a spark is generated on the commutation terminal side of the brush each time. In addition, this spark is not so large in normal operation, but may become excessive in the following cases.

For example, when the commutator motor is used in a vacuum cleaner, if the amount of cooling air flowing around the commutator motor decreases from the blower attached to the front surface of the commutator motor due to filter clogging, The temperature rises. When the temperature of the commutator is about 200 degrees, the roundness of the commutator is lost, the contact between the brush and the commutator becomes intermittent, and the spark generated on the commutation terminal side of the brush increases.
Further, when dust adheres to the blower, the blower vibrates, the roundness of the commutator is impaired, the contact between the brush and the commutator becomes intermittent, and the spark generated on the rectifying terminal side of the brush increases.
In addition, sparks generated on the rectifying terminal side of the brush may increase due to electrical failures such as breakage of the armature winding coil, rare short of the armature winding coil, defective commutator, etc. .

  When the spark becomes large due to such a phenomenon, there are problems that cause overheating of the electric motor, smoke from the brush and commutator, generation of a strange odor, ignition, and the like.

Conventionally, for example, Patent Document 1 and Patent Document 2 have dealt with such problems.
In the former, a thermostat, a thermal fuse, a thermistor, or the like is attached to the outer shell (bracket, frame, etc.) of the motor, and the temperature is detected to protect the motor.
In the latter case, a conductive material such as solder made of a low melting point metal or a heat-melting synthetic resin is connected between the brush sleeve and the terminal fitting formed in the current path flowing through the armature.
JP-A-8-237925 Japanese Patent No. 3181182

  However, in the method of attaching a thermostat, a thermal fuse, a thermistor, etc. to the outer shell of the electric motor as in the device described in Patent Document 1, it is possible to detect an increase in the electric motor temperature due to abnormal overheating, but a brush caused by the occurrence of an excessive spark In the case of detecting the temperature rise from the part, it takes time until the temperature rises, and there is a problem that it does not operate until an abnormality, smoke generation, or ignition occurs. In order to solve such a problem, it is conceivable to lower the set value. In this case, however, there is a possibility of causing a malfunction such as stopping the commutator motor even if it is not abnormally increased. It was.

  In addition, the apparatus described in Patent Document 2 uses a low-melting-point conductor such as solder having weak mechanical strength, and thus has a problem of being detached due to vibration in actual use. In addition, there is a problem in that the operating temperature varies depending on the amount of low melting point conductor such as solder and how it is attached. In addition, it is necessary to attach a low melting point conductor between the two after assembling or attaching a brush sleeve, which is a fine product, or a terminal fitting that forms an electric circuit, so that assembly workability is poor and reliability is obtained. It was difficult and expensive. In addition, when using solder, there is a problem of discharge of harmful substances due to scattering of solder when the solder is melted.

  Therefore, the present invention has been made to solve such problems in the prior art, and reduces the generation of off-flavor, smoke, and ignition after excessive sparks are generated between the commutator and the brush. An object of the present invention is to provide a commutator motor with improved reliability.

  An invention according to a first problem solving means for achieving the above object includes a stator, an amateur, a commutator connected to the amateur, a brush for supplying power to the commutator, a brush sleeve for inserting the brush, and a brush sleeve. A holder for holding, a detection element for detecting the temperature of the brush sleeve near the rectifying terminal side of the brush tip, and a substrate disposed along a side surface of the brush sleeve on the rectifying terminal side, The detection element is attached to the surface on the sleeve side, the circuit pattern of the detection element is arranged on the opposite side surface, and the detection element detects the temperature rise of the brush sleeve near the rectifying terminal side of the brush tip, thereby The electric motor is configured to stop when it is detected that an excessive spark has occurred on the rectifying terminal side of the unit.

  With this configuration, when an excessive spark occurs on the rectifying end side of the brush tip, the detection element detects the temperature in the vicinity of the brush sleeve where the temperature is highest, so it can quickly detect the occurrence of an excessive spark. And by stopping a commutator motor, generation | occurrence | production of a strange odor, smoke generation, and ignition can be reduced and reliability can be improved.

In the present invention, the detection element may be made of a molten material connected between a lead wire of a thermal fuse, a thermistor, or a brush.
In this way, a mass fuse, a thermistor, or a molten material connected between the lead wires of the brush can be used as the detection element, so the molten conductor is assembled with the brush sleeve and the terminal plate. Sometimes it can be installed easily and stably compared to the conventional one formed between the two parts, and as a result, the variation in operation due to the parts and the mounting method can be reduced, and the reliability is improved. To do. In addition, when an axial lead wire type thermal fuse is used as the thermal fuse, it is possible to easily insulate the brush sleeve by sticking an insulating sheet on the lead wire portion protruding linearly from both sides of the thermal fuse. .

In the above invention, the substrate may be fixed to the holder along the side surface of the brush sleeve on the rectifying terminal side.
In this way, the detection element can be arranged on the brush sleeve side of the substrate so that the detection element detects the temperature of the side surface on the rectifying end side of the brush sleeve, and the lead wire portion to the detection element is connected to the substrate. It can be arranged on the brush sleeve side. Accordingly, since the exposure of the conductive portion between the brush sleeve and the holder is reduced, insulation is facilitated.

In the above invention, the substrate may be disposed along the side surface of the brush sleeve formed in a direction orthogonal to the rotation axis of the amateur, and the detection element may be attached to the rectifying terminal side on the brush sleeve side surface of the substrate. .
In this way, the detection element can be arranged on the brush sleeve side of the substrate so that the detection element detects the temperature of the side surface on the rectifying end side of the brush sleeve, and the lead wire portion to the detection element is connected to the substrate. It can be arranged on the brush sleeve side. Accordingly, since the exposure of the conductive portion between the brush sleeve and the holder is reduced, insulation is facilitated. Further, in this case, unlike the case described above, since the detection element is not sandwiched between the substrate and the brush sleeve, it is useless between the surface portion of the brush sleeve to which the detection element is not attached and the substrate. Space is not born. Therefore, the commutator motor can be reduced in size accordingly.

  In addition, the position of the substrate can be fixed to eliminate variations in the operation of the detection element. For this purpose, a substrate fixing means for fixing the relative positional relationship between the brush sleeve and the substrate may be formed at the contact portion between the brush sleeve and the substrate. Moreover, in order to make this fixing means simple, you may comprise from the protrusion formed in the brush sleeve, and the through-hole formed in the board | substrate so that this protrusion can be inserted. Similarly, a protrusion formed on the brush sleeve and a through hole formed in the substrate so as to be able to penetrate the protrusion are provided, and the leading end is bent by penetrating the protrusion through the through hole of the substrate. You may comprise so that a board | substrate may be fixed to a predetermined position.

  Further, by positioning the substrate with respect to the holder, the substrate may be positioned with respect to the brush sleeve so as to eliminate variations in the operation of the detection element. That is, substrate positioning means for positioning the substrate may be formed at the joint between the substrate and the holder. Further, in order to simplify the configuration of the substrate positioning means, it is configured by fitting a protrusion formed on one of the substrate and the holder and a recess formed on either the substrate or the holder. Also good.

Further, in the above invention, the brush sleeve is cylindrical and has a target shape with the center surface in the rotation axis direction of the arm at both ends as a target surface, and flange portions protruding from the cylindrical container on the target surface Are formed in a shape that is joined so as to overlap, and a long object that forms the shape of the halved part before joining is formed, and the flange portion is cut at the length position that becomes the end portion on the commutator side, and at this cutting position You may make it form by bending a flange part in the length direction of a brush sleeve.
If comprised in this way, a cylindrical brush sleeve can be easily manufactured from one board | plate material. Moreover, the plate cutting can be performed efficiently.

  The invention according to the second problem solving means for achieving the above object includes a stator, an amateur, a commutator connected to the amateur, a brush for supplying power to the commutator, a brush sleeve for inserting the brush, and a brush A holder that holds the sleeve and a detection element that detects a temperature of the brush sleeve in the vicinity of the rectifying terminal side of the brush tip, and the brush sleeve protrudes further from the tip on the commutator side The detection element is attached to the holder so as to protrude from the holder to the vicinity of the rectifying terminal side of the brush tip, and is covered by bending the protruding piece. By detecting an increase in temperature, the motor is configured to stop when an excessive spark is detected on the rectifying terminal side of the brush tip. And wherein the Rukoto.

  In this way, the detection element is mounted so that it protrudes from the holder to the vicinity of the rectifying terminal end of the brush tip, so that if an excessive spark occurs on the rectifying terminal side of the brush tip, this can be detected quickly. Thus, the commutator motor can be stopped, the generation of off-flavor, smoke and fire can be reduced, and the reliability can be improved. Moreover, since the said detection element is attached by performing the change which forms an attachment part in a holder, it is not necessary to increase a number of parts, and it is cheaply attached. Further, since the detection element is covered with the protruding piece of the brush sleeve, the generated spark does not directly hit, and the detection element is prevented from being deteriorated. In addition, since the protruding piece collects heat generated from the generated spark with a surface area larger than the surface of the detection element, it is possible to quickly detect the generation of the spark.

In the present invention, the brush sleeve has a cylindrical shape and has a target shape with a central surface in the direction of the rotation axis of the amateur as a target surface, and flange portions projecting from the cylindrical container on the target surface Are formed so as to overlap each other, forming a long object having the shape of a half before joining, leaving a flange part at the end position on the rectifying terminal side, and a protruding piece on the cut part on one side May be formed by cutting the protruding piece on the other side so as to form a notch, and bending the flange portion in the length direction of the brush sleeve at this position.
If comprised in this way, a cylindrical brush sleeve can be easily manufactured from one board | plate material. Further, the plate can be efficiently taken. Moreover, since the above-mentioned protruding piece is also formed integrally with the brush sleeve, the efficiency of cutting is improved. Moreover, since the notch is formed in the part where the detection element is not attached, the heat of the excessive spark can be concentrated in the detection element part. For this reason, detection by the detection element becomes even more sensitive.

  The invention according to the third problem solving means for achieving the above object includes a stator, an armature, a commutator connected to the armature, a brush for supplying power to the commutator, a brush sleeve for inserting the brush, and a brush. A holder for holding the sleeve, and a detection element for detecting the temperature of the brush sleeve near the rectifying end side of the brush tip, and the detecting element includes a holder and a brush sleeve near the rectifying end side of the brush tip The surface of the holder on the brush sleeve side so that the longitudinal direction of the detection element is oriented in the longitudinal direction of the brush sleeve and the side surface of the detection element slightly protrudes from the brush sleeve side surface of the holder The detection element detects an increase in the temperature of the brush sleeve near the rectifying terminal side of the brush tip. Accordingly, when an excessive spark rectification end side of the brush tip is detected that occurs, the motor characterized by comprising configured to stop.

  If comprised in this way, since the detection element is attached so that it may be pinched | interposed into a holder and a brush sleeve in the contact surface of the holder and brush sleeve by the side of the rectification | straightening end of a brush front-end | tip part, It can be detected reliably, and when a spark is generated on the rectifying terminal side of the brush tip, it can be detected quickly and the commutator motor can be stopped, reducing the generation of off-flavors, smoke and ignition, and improving reliability. Can be made. Further, since the detection element can be mounted by changing the mounting portion of the holder on the brush sleeve side surface portion, it is not necessary to increase the number of parts, and the detection element mounting cost is low. . In addition, since the detection element is sandwiched and pressed between the brush sleeve and the holder, there will be no positional deviation due to vibration or the like during startup or operation of the commutator motor, and variations in temperature detection will occur. There is nothing. In addition, since the positional displacement due to vibration does not occur in this way, it is possible to prevent disconnection of the lead wire portion.

  In addition, the invention according to the fourth problem solving means for achieving the above object includes a stator, an amateur, a commutator connected to the amateur, a brush for supplying power to the commutator, a brush sleeve for inserting the brush, and a brush A holder for holding the sleeve, and a detection element for detecting the temperature of the brush sleeve near the rectifying end side of the brush tip, and the detecting element includes a holder and a brush sleeve near the rectifying end side of the brush tip And a heat collecting part in which a part of the lead wire part of the thermal fuse is arranged in the vicinity of the rectifying terminal side of the brush, and the detection element is By detecting an increase in the temperature of the brush sleeve near the rectifying terminal end of the brush tip, it is possible to detect that an excessive spark has occurred on the rectifying terminal side of the brush tip. Motor is characterized in that to stop.

  In this way, the thermal fuse senses the heat transferred through the brush sleeve and the heat transferred through the heat collecting part formed by a part of the lead wire part. Even without touching the spark directly, the occurrence of the spark can be detected quickly. As a result, when an excessive spark is generated, the commutator motor can be quickly stopped, the generation of off-flavor, smoke, and fire can be reduced, and the reliability can be improved.

  In this case, if the heat collecting part is formed in a non-linear shape, for example, if the heat collecting part has an appropriate non-linear shape such as an arc shape, a V shape, a W shape, or a zigzag shape, the heat collecting area in the heat collecting portion is increased. The thermal fuse can be operated more sensitively.

In this case, the lead wire portion of the thermal fuse may be covered with an insulating sheet obtained by cutting out the thermal fuse portion.
If it does in this way, insulation between a thermal fuse and a brush sleeve can be easily performed by sticking an insulating sheet from above in the state where a thermal fuse was attached to a holder, and attaching a brush sleeve after that. Further, since the temperature fuse portion of the insulating sheet is cut out, the thermal conductivity between the brush sleeve heat and the temperature fuse can be improved, and the sensitivity of the temperature fuse can be maintained well.

  Further, the invention according to the fifth problem solving means for achieving the above object includes a stator, an amateur, a commutator connected to the amateur, a brush for supplying power to the commutator, a brush sleeve for inserting the brush, and a brush A holder that holds the sleeve and a detection element that detects a temperature in the vicinity of the rectification terminal side of the brush tip, and the detection element projects from a holder that is positioned in the vicinity of the rectification terminal side of the brush tip When the detection element detects that an excessive spark has occurred on the rectifying terminal side of the brush tip by detecting a temperature rise near the rectifying terminal side of the brush tip part. Further, the motor is stopped.

  If comprised in this way, since a detection element consists of a molten material which melts at the temperature connected to the lead wire which protrudes from the holder located in the rectification termination side of the brush tip part, an excessive spark is generated. In this case, the commutator motor can be stopped by quickly detecting this, and the generation of off-flavor, smoke and fire can be reduced, and the reliability can be improved. In addition, the detection element connected by a substance that melts at a temperature such as solder can be manufactured, and this can be easily attached by attaching it to the brush portion. Moreover, such a detection element is easy to mass-produce, such as a general-purpose thermal fuse, and can be operated without variation.

  The invention according to a sixth problem solving means for achieving the above object includes a stator, an armature, a bracket housing the stator and the armature, a commutator connected to the armature, a brush for supplying power to the commutator, Brush sleeve for inserting and attaching a brush into the bracket, a holder for fixing the brush sleeve to the bracket, a detecting element for detecting the temperature near the rectifying terminal side of the brush tip, and the rectifying terminal side of the brush sleeve And a substrate disposed so as to extend through the holder from the commutator side so as to extend outside, and the circuit board of the detection element is disposed on the side opposite to the sleeve, A terminal portion is formed on the outside of the holder of the circuit pattern, and the detection element is arranged on the sleeve side surface of the substrate on the axis of rotation of the armature and the armature. It consists of an axial lead wire type thermal fuse attached so as to be parallel, and operates when an excessive spark occurs on the rectifying terminal side of the brush tip and operates to stop the motor. .

  With this configuration, since the thermal fuse is disposed at a position closest to the spark generated on the rectifying terminal side of the brush tip, the thermal fuse is positioned closest to the spark generated on the rectifying terminal side of the brush tip. It will be attached. Therefore, the temperature from the spark can be detected in the entire temperature fuse, the temperature fuse can be operated instantaneously when an excessive spark occurs, and the generation of off-flavor and smoke emission after the occurrence of the spark can be greatly reduced. . In addition, the thermal fuse uses a mass-produced axial lead wire type, so it is inexpensive and has stable characteristics. Furthermore, since the lead wire portion is also hard, it can be easily and stably installed compared to solder or the like, and the operation variation due to component mounting is small and the reliability is high. In addition, the axial lead wire type thermal fuse is made of ceramic and epoxy on the outer surface, so it is flame retardant, suitable for the environment in which the spark is exposed, and because it is cylindrical, the area perceived by the spark increases. , The sensitivity will be better. Further, since the assembly can be performed by a simple method of attaching the element to the substrate and inserting the brush assembly in which the substrate is inserted into the holder into the bracket, it is possible to reduce variations during assembly and improve sensitivity.

In this case, the brush sleeve may have a protrusion on the side surface on the rectifying end side located outside the holder, and the substrate may have a through hole into which the protrusion is fitted.
In this way, it is not necessary to increase the number of parts for mounting the board, and the cost can be reduced.

Further, in this case, the holder is formed such that a gap is formed between the substrate and the wall surface on the extension of the anti-sleeve side wall surface of the through hole that penetrates the substrate on the outside side in the assembled state where the substrate is penetrated. It is good also as what is comprised by.
In this way, when the substrate is inserted into the holder, the substrate can be bent to the half-sleeve side using the gap, so that the protrusion of the brush sleeve can be easily fitted into the through hole of the substrate. After being fitted, the bending of the substrate returns, so that locking can be realized. Therefore, it is possible to more easily attach and fix the substrate without increasing the number of parts, and the cost can be further reduced.

In this case, the substrate may have a flame retardant silicon adhesive applied to the lead portion of the thermal fuse.
If it does in this way, insulation with a charging part can be performed reliably by the simple method of apply | coating an adhesive agent as an insulating material, and the intensity | strength with respect to the vibration of an element can also be improved.

Further, in this case, the substrate may be formed such that the dimension in the rotation axis direction of the thermal fuse mounting portion is larger than the dimension in the same direction on the holder penetration part or outside thereof.
In this case, since the through holes of the bracket and the holder can be made small, it is possible to avoid an increase in the size of the brush assembly and an increase in the size of the motor.

In the commutator motor according to the invention relating to the first, fourth, and sixth problem solving means, the temperature fuse may be connected in series to the power supply circuit in the control circuit.
In this way, for models that are not configured to stop the control circuit when an excessive spark occurs, simply insert a thermal fuse into the lead wire of the power circuit in the control circuit, and the control circuit can easily be Can be changed to a model to stop.

In the commutator motor according to the first or fifth aspect of the present invention, the detection element made of the molten material may be connected in series to a power supply circuit in a control circuit.
In this way, for models that are not configured to stop the control circuit when an excessive spark occurs, an excessive spark can be easily obtained simply by inserting a detection element made of a molten material into the lead wire portion of the power circuit in the control circuit. It can be changed to a model that stops the control circuit when it occurs.

Further, in the commutator motor of the invention according to the first, fourth, and sixth problem solving means, the temperature fuse is divided in series with the motor temperature detection circuit in the control circuit, specifically, a voltage divider constituted by a thermistor and a resistor. You may make it connect to the thermistor side or resistance side of a circuit.
In this way, for models that are not configured to stop the control circuit when an excessive spark occurs, simply insert a thermal fuse into the motor temperature detection circuit in the control circuit and easily stop the control circuit when an excessive spark occurs. It can be changed to a model that can do.

In the commutator motor according to the invention relating to the first or fifth problem solving means, the detection element made of a molten material is configured in series with the motor temperature detection circuit in the control circuit, specifically, a thermistor and a resistor. You may make it connect to the thermistor side or resistance side of a voltage dividing circuit.
In this way, for models that are not configured to stop the control circuit when an excessive spark occurs, it is possible to easily detect an excessive spark by simply inserting a detection element made of a molten material into the motor temperature detection circuit in the control circuit. It is possible to change to a model that can stop the control circuit.

  According to the commutator motor according to the first problem solving means, when an excessive spark is generated on the rectifying terminal side of the brush tip, the detection element detects a temperature in the vicinity of the highest temperature of the brush sleeve. Therefore, by detecting the occurrence of an excessive spark quickly and stopping the commutator motor, it is possible to reduce the generation of off-flavors, smoke and fire, and improve the reliability.

  Further, according to the commutator motor according to the second problem solving means, the detection element is mounted so as to protrude from the holder in the vicinity of the rectifying terminal side of the brush tip part. When a spark occurs, this can be detected quickly and the commutator motor can be stopped to reduce the generation of off-flavors, smoke and fire, and improve reliability. Moreover, since the said detection element is attached by performing the change which forms an attachment part in a holder, it is not necessary to increase a number of parts, and it is cheaply attached. Further, since the detection element is covered with the protruding piece of the brush sleeve, the generated spark does not directly hit, and the detection element is prevented from being deteriorated. Further, since the protruding piece collects heat generated from the generated spark with a surface area equal to or larger than the surface area of the detection element, the occurrence of the spark can be detected quickly.

  Further, according to the commutator motor according to the third problem solving means, the detection element is attached so as to be sandwiched between the holder and the brush sleeve on the contact surface between the holder and the brush sleeve on the commutation terminal side of the brush tip. Therefore, the temperature of the brush sleeve can be reliably detected, and when an excessive spark occurs on the rectifying terminal side of the brush tip, this can be detected quickly and the commutator motor can be stopped, generating a strange odor and generating smoke. , Can reduce ignition and improve reliability. Further, since the detection element can be mounted by changing the mounting portion of the holder on the brush sleeve side surface portion, it is not necessary to increase the number of parts, and the detection element mounting cost is low. . In addition, since the detection element is sandwiched and pressed between the brush sleeve and the holder, there will be no positional deviation due to vibration or the like during startup or operation of the commutator motor, and variations in temperature detection will occur. There is nothing. In addition, since the positional displacement due to vibration does not occur in this way, it is possible to prevent disconnection of the lead wire portion.

  Further, according to the commutator motor according to the fourth problem solving means, the thermal fuse is transferred through the heat transferred through the brush sleeve and the heat collecting part formed by a part of the lead wire part. It can sense the heat generated. Therefore, when an excessive spark is generated, the commutator motor can be quickly stopped, the generation of off-flavor, smoke, and fire can be reduced, and the reliability can be improved.

  Further, according to the commutator motor according to the fifth problem solving means, the detection element is melted at a temperature connected to the lead wire portion that protrudes from the holder located on the rectifying terminal side of the brush tip portion. Therefore, when an excessive spark occurs, this can be detected quickly and the commutator motor can be stopped to reduce the generation of off-flavors, smoke and fire, and improve the reliability. Moreover, it can attach simply by producing the lead wire part connected with the substance which melts with temperature, such as solder, and attaching this to a brush part. Moreover, such a detection element is easy to mass-produce, such as a general-purpose thermal fuse, and can be operated without variation.

  Further, according to the commutator motor according to the sixth problem solving means, the temperature fuse is arranged at the position closest to the spark on the rectifying terminal side of the brush tip portion, so that the temperature from the spark is detected in the entire temperature fuse. Therefore, the thermal fuse can be operated instantaneously when an excessive spark is generated, and the generation of strange odors and smoke generation after the occurrence of the spark can be greatly reduced. In addition, since the thermal fuse is a mass-produced product, it is inexpensive and stable in characteristics, and the lead wire part is also hard, so it can be installed easily and stably compared to solder, etc. Small variation and high reliability. In addition, since an axial lead wire type thermal fuse is used, it is flame retardant, suitable for conditions exposed to sparks, and because it is cylindrical, the area perceived by sparks increases and sensitivity is improved. Further, since the assembly can be performed by a simple method of attaching the element to the substrate and inserting the brush assembly in which the substrate is inserted into the holder into the bracket, it is possible to reduce variations during assembly and improve sensitivity.

  Embodiments in which the present invention is applied to an electric blower will be described below with reference to the drawings.

  First, the electric blower according to the first embodiment will be described with reference to FIGS. FIG. 1 is an explanatory diagram of the basic configuration of the electric blower according to the first embodiment of the present invention, and shows the upper half from the center in a vertical sectional view. FIG. 2 is a perspective view of a brush assembly of the blower motor. FIG. 3 is a perspective view of a holder in the brush assembly. FIG. 4 is a perspective view of the brush assembly in a state where the brush sleeve and the substrate are combined. FIG. 5 is a state diagram immediately before the substrate and the brush sleeve are assembled as shown in FIG. FIG. 6 is a perspective view of a single substrate in the brush assembly.

The electric blower according to the first embodiment includes a commutator electric motor 1 and a blower 2 as shown in FIGS.
The commutator motor 1 includes a stator 4 and an armature 5 housed in a substantially cylindrical bracket 3 with a bottom that opens at one end (left end in the figure). An end bracket 7 fixed by a screw 6 is provided at one end opening of the bracket 3. The amateur 5 includes an amateur coil, a rotating shaft 8, and a commutator 9 fitted to the rotating shaft 8. The commutator 9 has a plurality of commutator pieces arranged in parallel with each other, and is fed to the amateur coil through the commutator pieces. Both ends of the rotating shaft 8 of the amateur 5 are rotatably supported by ball bearings 8a that are press-fitted and fixed to the bottom surface of the bracket 3 and the central portions of the end bracket 7, respectively. A cooling air discharge port 10 for cooling the stator 4 and the armature 5 is formed on the rear side surface of the bracket 3, and a pair of through holes 11 for attaching the pair of brush assemblies 30 are provided.

On the other hand, the blower 2 is formed by covering the centrifugal fan 21 and the diffuser 22 with a metallic fan cover 23.
The centrifugal fan 21 includes a plurality of spiral blades 24 and a front shroud 25 and a rear shroud 26 sandwiching the front and rear thereof. The front shroud 25 is formed with a suction port 27 for sucking air at the center thereof. Moreover, the space | interval of the front surface shroud 25 and the rear surface shroud 26 is formed so that it may become narrow gradually from the suction inlet 27 toward an outer peripheral part. By having such a configuration, the centrifugal fan 21 is configured to compress the air sucked from the suction port 27 and discharge it from the discharge port 28 in the outer peripheral portion in the radial direction. Further, the centrifugal fan 21 configured as described above is pivotally supported on the rotary shaft 8 protruding from the end bracket 7 of the commutator motor 1 and is fixed by a nut 29.

  The diffuser 22 has a spiral stationary blade 22a, and converts a dynamic pressure into a static pressure by gradually expanding a passage sandwiched between the stationary blades 22a. It arrange | positions between and it fixes to the end bracket 7 with the screw | thread 22b.

  The fan cover 23 is formed so as to be press-fitted into the outer peripheral portion of the end bracket 7 of the commutator motor 1 so as to cover the front surface and outer peripheral surface of the centrifugal fan 21 and the diffuser 22. An air inlet 23 a corresponding to the air inlet 27 of the centrifugal fan 21 is formed at the center.

As shown in FIGS. 2 to 6, the brush assembly 30 includes a holder 31, a brush sleeve 32, a brush 33, a substrate 34, a detection element 35, and the like.
The holder 31 is made of an insulating material made of a thermosetting synthetic resin such as phenol resin having electrical insulation, and has a holder body 36 and a mounting flange 37. Further, as shown in FIG. 3, the holder 31 includes a cylindrical portion 38 for holding the brush sleeve 32 at the center portion. One part of the cylindrical portion 38 is inserted into the through hole 11 of the bracket 3 described above. The mounting flange 37 is overlaid on the outer peripheral surface of the bracket 3. As shown in FIG. 1, the holder 31 is fixed to the bracket 3 by tightening a screw 39 passing through the mounting flange 37 to the bracket 3. .

  The brush sleeve 32 is formed in a substantially rectangular tube shape by an electric conductor such as brass or a galvanized steel plate. More specifically, as can be seen from FIG. 5, the brush sleeve 32 has a pair of flat walls 32a and a mountain wall 32b connecting the flat walls 32a, and is divided into two at the central portion of the mountain wall 32b. A flange 32c is formed at the joint. The angled wall 32b allows the air in the brush sleeve 32 to pass through and suppresses the temperature rise of the brush 33. Further, as shown in FIG. 2, the brush sleeve 32 is held through the tubular portion 38 of the holder 31 described above.

  As the brush 33, a carbon brush obtained by binding and hardening carbon powder with a binder made of a rigid resin is employed. The brush 33 is accommodated in the brush sleeve 32 so as to be movable in the longitudinal direction. A coil spring 33 a for pressing the brush 33 against the commutator 9 is attached to the end of the brush sleeve 32.

  The board | substrate 34 is a plate-shaped thing which consists of an insulating material, and is attached so that the mountain-shaped wall 32b of the brush sleeve 32 may be followed, as shown in FIG. After the substrate 34 and the brush sleeve 32 are assembled as shown in FIG. 4, as shown in FIG. 2, the substrate 34 and the brush sleeve 32 pass through the cylindrical portion 38 of the holder 31 and are held by the holder 31. The angled wall 32 b held at this position becomes the side surface of the brush sleeve 32 positioned on the rectifying terminal side of the brush 33. As shown in FIG. 6, the surface of the substrate 34 on the brush sleeve 32 side is a general-purpose axial lead wire type as a detection element 35 for detecting an excessive spark generated on the rectifying terminal side of the brush 33. A thermal fuse 40 is attached.

The thermal fuse 40 detects this when the spark generated between the brush 33 and the commutator 9 in the commutator motor 1 and particularly the spark generated on the commutation terminal side becomes abnormally large, and interrupts the circuit. Is. Therefore, the temperature fuse 40 has an axial direction of the brush so that the temperature in the vicinity of the tip of the rectifying end side wall surface where the temperature becomes the highest among the surfaces of the brush sleeve 32 when an excessive spark occurs is detected. The sleeve 32 is attached in the longitudinal direction.
In addition, lead wire portions 41 extend linearly from both ends of the thermal fuse 40. As an insulating means between the lead wire portion 41 and the brush sleeve 32, an insulating sheet 42 is affixed as shown in FIG.

  Further, a circuit pattern 43 to the detection element is disposed on the side of the substrate 34 opposite to the brush sleeve. Thereby, the exposure of the conductive portion is limited to the minimum necessity on the brush sleeve side. The circuit pattern 43 is led out through the cylindrical portion of the holder 31, and is connected to a control circuit or a power supply circuit (not shown) from a terminal 44 a in a terminal box 44 provided on the substrate 34.

  When the spark generated on the commutation termination side between the brush 33 and the commutator 9 becomes abnormally excessive, the thermal fuse 40 detects this and interrupts the circuit, and stops the operation of the commutator motor 1. Therefore, it is possible to directly connect to the power line of the commutator motor 1, but in this case, the breaking current increases and the temperature fuse 40 and the lead wire portion 41 increase. Therefore, the temperature fuse 40 is preferably connected to the control circuit of the commutator motor 1 that is a low voltage circuit, and the drive circuit is cut off by the temperature fuse 40 to stop the commutator motor 1.

  In order to eliminate the variation in the position of the thermal fuse 40 and the variation in the sensitivity of the thermal fuse 40, it is necessary to make the position of the substrate 34 relative to the brush sleeve 32 constant. In the present embodiment, as a substrate fixing means, a protrusion 45 is formed on the side surface of the brush sleeve 32 on the rectifying terminal side, and a through hole 46 through which the protrusion 45 can pass is provided in the substrate 34. Then, when the substrate 34 is attached to the brush sleeve 32, the protrusion 45 is passed through the through hole 46, and the tip of the protrusion 45 is bent as shown in FIG. It is attached to a predetermined position.

Since Example 1 is configured as described above, the following effects can be achieved.
When an excessive spark occurs on the rectifying end side of the brush tip, the detection element 35 detects the temperature in the vicinity of the brush sleeve 32 where the temperature is highest, so that the occurrence of the excessive spark is quickly detected and rectified. The child electric motor 1 can be stopped. Moreover, by comprising in this way, generation | occurrence | production of off-flavor, smoke generation, and ignition can be reduced and reliability can be improved.

  In the first embodiment, a mass fuse 40 is used as the detection element 35. Since the detection element is not formed when the brush assembly 30 is assembled as in the prior art, the operating temperature is Small variation and stable quality. In addition, it can be installed easily and stably, the variation in operation due to parts and mounting methods can be reduced, and the reliability is improved.

  Further, a thermal fuse 40 as a detection element 35 is attached to the surface of the brush sleeve 32, and a circuit pattern of the thermal fuse 40 is formed on the surface on the opposite side, and this substrate 34 is placed near the rectifying terminal side of the brush tip. Since the brush sleeve 32 is attached so as to be along the side surface on the rectifying terminal side, it is possible to detect the temperature of the brush sleeve 32 where the temperature is highest, and to expose the conductive portion between the brush sleeve 32 and the holder 31. In order to minimize insulation, insulation can be easily performed.

  Further, since the substrate fixing means for fixing the relative positional relationship between the brush sleeve 32 and the substrate 34 is formed at the contact portion between the brush sleeve 32 and the substrate 34, the mounting position of the thermal fuse 40 is stabilized, Variations in the operation of the thermal fuse 40 can be eliminated.

  Next, Example 2 will be described with reference to FIGS. The second embodiment shows an example in which the substrate positioning method is different from the first embodiment. FIG. 7 is a perspective view of a brush assembly according to Embodiment 2 of the present invention. FIG. 8 is a perspective view of the brush assembly in a state immediately before mounting the substrate. FIG. 9 is a perspective view of a holder in the brush assembly. FIG. 10 is a perspective view of the brush assembly holder as viewed from the commutator side. In these drawings, the same or corresponding parts as those in the first embodiment are denoted by the same reference numerals, and the description thereof is omitted.

In the second embodiment, the substrate positioning means includes a notch 52 provided in the substrate 51, a substrate insertion slit 54 provided in the holder 53, and a protrusion 55 fitted in the notch 52 of the substrate 51. . Thus, in the second embodiment, the substrate 51 is directly attached to the holder 53.
Further, in view of the positioning of the substrate 51 as described above, the second embodiment is different from the first embodiment in the following points, and other configurations are the same as those of the first embodiment.
That is, the substrate 51 is different from that of the first embodiment in that it does not have the through hole 46 in the first embodiment and has a notch 52. As in the case of the first embodiment, since the substrate 51 is not inserted into the cylindrical portion 56, the holder 53 is formed so that the size of the cylindrical portion 56 is smaller than the cylindrical portion 38 of the first embodiment. A slit 54 is provided on the side of the cylindrical portion 56, and a protrusion 55 is formed at the bottom of the slit 54. Further, since the substrate 51 is not attached to the brush sleeve 32, the protrusion 45 is not formed on the side surface of the brush sleeve 32 in the first embodiment.

Therefore, in the second embodiment, the mounting of the thermal fuse 40 is basically the same as that of the first embodiment, and the temperature fuse 40 has the highest temperature in the brush sleeve 32 as in the first embodiment. Therefore, by detecting the occurrence of an excessive spark quickly and stopping the commutator motor 1, it is possible to reduce the generation of off-flavors, smoke and fire, and improve the reliability.
Further, since the temperature fuse 40 is used as the detection element 35, the operation is less varied and the reliability is good.
Similarly to the first embodiment, the thermal fuse 40 as the detection element 35 is attached to the brush sleeve side surface of the substrate 34, and the circuit pattern 43 of the thermal fuse 40 is formed on the opposite surface, so that the brush sleeve Exposure of the conductive part between 32 and the holder 31 is reduced, and insulation is facilitated.

  Further, in the second embodiment, since the substrate 51 is positioned with respect to the holder 53, the mounting position of the thermal fuse 40 is stabilized, and variations in the operation of the thermal fuse 40 can be eliminated.

  Next, a third embodiment will be described with reference to FIGS. The third embodiment shows an example in which the board mounting position and the board fixing method are different from those of the first embodiment. FIG. 11 is a perspective view of a brush assembly according to Embodiment 3 of the present invention. FIG. 12 is a perspective view of a holder used in the brush assembly. FIG. 13 is a state diagram in which a substrate is attached to a brush sleeve in the brush assembly. FIG. 14 is a perspective view of a brush sleeve in the brush assembly, showing a state where a brush is inserted. FIG. 15 is a perspective view of a substrate in the brush assembly. In these drawings, the same or corresponding parts as those in the first embodiment are denoted by the same reference numerals, and the description thereof is omitted.

In the third embodiment, the substrate 61 is arranged along the side surface of the brush sleeve 32 formed in a direction orthogonal to the rotation axis 8 of the armature 5, and the thermal fuse 40 as the detection element 35 is connected to the brush sleeve of the substrate 61. It is attached to the rectifying terminal side on the side surface.
The substrate fixing means includes a protrusion 67 formed on the brush sleeve 32 at a contact portion between the brush sleeve 32 and the substrate 61 and a hole 63 formed on the substrate 61 so that the protrusion 67 can be fitted. It is configured.

Further, the third embodiment is different from the first embodiment in the following points in relation to the configuration as described above, and the other configurations are the same as the first embodiment.
That is, the substrate 61 is different from that of the first embodiment in that a rectangular hole 63 is provided instead of the through hole 46 in the first embodiment. The holder 64 is arranged so that the substrate 61 extends along a side surface of the brush sleeve 32 formed in a direction orthogonal to the rotation axis 8 of the armature 5, and the temperature fuse 40 is on the rectifying terminal side of the brush sleeve side surface of the substrate 61. In view of the fact that the slit 66 is formed in order to install the substrate 61 and the cross-sectional shape of the cylindrical portion 65, the difference is made. Further, the brush sleeve 32 is formed with a protrusion 67 on a side surface formed in a direction orthogonal to the rotation shaft 8 of the armature 5 instead of the protrusion 45 of the first embodiment.

Therefore, in the third embodiment, the substrate 61 is disposed along the side surface of the brush sleeve 32 formed in the direction orthogonal to the rotation axis 8 of the armature 5, and the thermal fuse 40 as the detection element 35 is disposed in the brush sleeve of the substrate 61. Since it is attached to the rectifying terminal side on the side surface, the temperature fuse 40 can detect the temperature in the vicinity of the brush sleeve 32 where the temperature is highest, as in the first embodiment. Moreover, by being comprised in this way, generation | occurrence | production of an excessive spark can be detected rapidly, the commutator electric motor 1 can be stopped, off-flavor generation | occurrence | production, smoke generation, and ignition can be reduced, and reliability can be improved.
In addition, when the substrate 61 and the thermal fuse 40 are attached in this manner, unlike the case of the first embodiment, the thermal fuse 40 is not sandwiched between the substrate 61 and the brush sleeve 32. There is no wasted space between the surface portion of the brush sleeve 32 that is not attached and the substrate 61. Therefore, the commutator motor 1 can be downsized accordingly.

Further, since the temperature fuse 40 is used as the detection element 35, the operation is less varied and the reliability is good.
Similarly to the first embodiment, the thermal fuse 40 as the detection element 35 is attached to the brush sleeve side surface of the substrate 61, and the circuit pattern 43 of the thermal fuse 40 is formed on the opposite surface, so that the brush sleeve Exposure of the conductive portion between 32 and the holder 64 is reduced, and insulation is facilitated.

  Also, in the case of the third embodiment, as in the case of the first embodiment, since the substrate 61 is positioned with respect to the holder 64, the mounting position of the thermal fuse 40 is stabilized, and the variation of the operation of the thermal fuse 40 is reduced. It can be lost.

  Next, Example 4 will be described with reference to FIGS. The fourth embodiment is different from the first embodiment in that a temperature fuse as a detection element is directly attached to the holder. FIG. 16 is a perspective view of a brush assembly according to Embodiment 4 of the present invention. FIG. 17 is a view of the brush assembly as viewed from the commutator side, in which the brush sleeve and the brush are not inserted. FIG. 18 is a state diagram in which the brush sleeve is attached to the brush assembly, and is an enlarged view around the brush sleeve. FIG. 19 is an enlarged perspective view around the thermal fuse in the brush assembly. FIG. 20 is an enlarged view around the thermal fuse in FIG. In these drawings, the same or corresponding parts as those in the first embodiment are denoted by the same reference numerals, and the description thereof is omitted.

  In the fourth embodiment, without using the substrate 34 as in the first embodiment, the thermal fuse 40 is directly attached to the brush sleeve side surface of the protruding wall 73 protruding from the cylindrical portion 72 of the holder 71. It is designed to be surely brought into contact with the side surface on the rectification end side. For this reason, the longitudinal side surface of the thermal fuse 40 is the longitudinal direction of the brush sleeve 32 in the contact surface between the brush wall 32 and the protruding wall 73 of the holder 71 on the rectifying terminal side of the brush front end portion. A recess 74 for fitting the thermal fuse 40 is formed in the brush sleeve side surface portion of the protruding wall 73 so that the side surface of the thermal fuse 40 slightly protrudes from the brush sleeve side surface, and the thermal fuse 40 is inserted into the recess 74. ing. Further, a part of the lead wire portion 41 of the thermal fuse 40 is configured to be exposed at the tip end portion of the cylindrical portion 72 of the holder 71.

The fourth embodiment is configured as described above, and is different from the first embodiment in the following points.
That is, in the fourth embodiment, the substrate 34 as in the first embodiment is not used. The holder 71 has the above-described recess 74 for attaching the thermal fuse 40 and a hole 75 (only a part is shown) for leading the lead wire portion 41 of the thermal fuse 40 from the inside of the holder 71 to the outside of the bracket 3. )have. Further, the holder 71 is provided with a terminal 76 on the side of the holder 71 (upper side in FIG. 16) for connecting the lead wire portion 41 of the thermal fuse 40 to a circuit outside the holder 71. As described above, a part of the lead wire portion 41 of the thermal fuse 40 is arranged near the tip end portion of the protruding wall 73 of the holder 71, that is, near the rectifying terminal side of the brush 33, and functions as the heat collecting portion 77. Therefore, in this embodiment, it can be said that the detection element 35 is constituted by the thermal fuse 40 and the heat collecting portion 77.

Since the fourth embodiment is configured as described above, the following effects can be obtained.
That is, the temperature fuse 40 constituting the detection element 35 is connected to the holder 71 (the protruding wall 73 of the holder 71 in this case) and the brush sleeve 32 on the contact surface between the brush 71 and the holder 71 on the rectifying terminal side of the brush tip. Therefore, the temperature of the brush sleeve 32 can be reliably detected, and when an excessive spark occurs on the rectifying terminal side of the brush tip, this is quickly detected and the commutator motor 1 is stopped. It is possible to reduce the generation of off-flavor, smoke and fire, and improve the reliability. Further, the temperature fuse 40 as the detection element 35 can be attached by performing a change in which the attachment portion (in this case, the protruding wall 73 and the recess 74) of the thermal fuse 40 is formed on the brush sleeve side surface portion of the holder 71. Therefore, it is not necessary to increase the number of parts, and the cost for mounting the thermal fuse is reduced. Further, since the thermal fuse 40 is sandwiched and pressed between the brush sleeve 32 and the holder 71, the positional deviation or the like does not occur due to vibration or the like during startup or operation of the commutator motor 1, and temperature detection is possible. There will be no variation. In addition, since the displacement due to the vibration does not occur in this way, the disconnection of the lead wire portion 41 can be prevented.

  In the fourth embodiment, the thermal fuse 40 senses heat transferred through the brush sleeve 32 and heat transferred through the heat collecting portion 77 formed by a part of the lead wire portion 41. Therefore, even if the thermal fuse 40 itself does not directly touch the spark, the occurrence of the spark can be detected quickly. As a result, when an excessive spark is generated, the commutator motor 1 can be stopped more quickly, the generation of off-flavor, smoke, and fire can be reduced, and the reliability can be further improved.

  Next, a fifth embodiment will be described with reference to FIGS. In the fifth embodiment, the heat collecting effect of the heat collecting section in the fourth embodiment is further improved. FIG. 21 is a perspective view of a brush assembly according to Embodiment 5 of the present invention. FIG. 22 is a view as seen from the brush side of the brush assembly. FIG. 23 is a perspective view of a thermal fuse assembly in the brush assembly. In these drawings, the same or corresponding parts as those in the fourth embodiment are designated by the same reference numerals, and the description thereof is omitted.

  The fifth embodiment is different from the fourth embodiment in that the heat collecting section 77 in the fourth embodiment is a heat collecting section 87 constituted by non-linear lead wires. As a non-linear specific example, FIGS. 21 to 23 show an example of zigzag formation, but this shape is not limited, and other appropriate shapes such as an arc shape, a V shape, a W shape, etc. It can be a non-linear shape.

  Since the fifth embodiment is configured as described above, the heat collecting area in the heat collecting section 87 can be increased and the thermal fuse can be operated more sensitively than in the case of the fourth embodiment. .

  Next, Example 6 will be described with reference to FIGS. Example 6 relates to an example in which a molten substance connected to a lead wire portion is used as a detection element without using a thermal fuse as the detection element in Example 4. FIG. 24 is a perspective view of a brush assembly according to Embodiment 6 of the present invention. FIG. 25 is an enlarged perspective view around the detection element in the brush assembly. FIG. 26 is a perspective view of a molten material assembly as a detection element in the brush assembly. In these drawings, the same or corresponding parts as those in the fourth embodiment are designated by the same reference numerals, and the description thereof is omitted.

  In the sixth embodiment, as the detection element 35 that detects the occurrence of an excessive spark generated on the rectifying terminal side of the brush tip, the molten material 90 that melts due to the temperature of solder or the like is on the rectifying terminal side of the brush, that is, the commutator piece. It is used in a substantially parallel direction with respect to the rotation shaft 8 in an opposing manner.

The sixth embodiment is configured as described above, and is different from the fourth embodiment in the following points.
That is, in Example 6, the thermal fuse 40 is not used. Therefore, the cylindrical portion 72 of the holder 71 is not formed with the concave portion 74 for inserting the thermal fuse. Further, a circuit portion in which a molten substance 90 that melts at a temperature is connected to a position corresponding to the heat collecting portion 77 formed by the lead wire portion 41 of the thermal fuse 40 is formed as the detection element 35.

  Since the sixth embodiment is configured as described above, a detection element connected with a molten substance 90 that melts at a temperature such as solder is produced, and this is attached to the rectifying terminal side at the tip of the brush portion, thereby causing an excessive spark. When this occurs, the commutator motor 1 can be quickly detected to stop the generation of off-flavors, smoke and fire, and improve the reliability. Further, the mounting is simple, and mass production is easy like a general-purpose thermal fuse. Therefore, the detection element according to the fourth embodiment can be operated without variation.

  Next, Example 7 is demonstrated based on FIGS. In Example 7, the insulation between the thermal fuse used as the detection element and the brush sleeve in Example 4 is facilitated. FIG. 27 is a perspective view of a brush assembly according to Embodiment 7 of the present invention. FIG. 28 is a perspective view of the vicinity of the detection element as seen from the brush sleeve side, with the brush sleeve partially removed from the brush assembly. FIG. 29 is a perspective view of the same angle as FIG. 27, and shows a state where the insulating sheet is peeled off. FIG. 30 is a perspective view of substantially the same angle as FIG. 28, and shows a state where the insulating sheet is peeled off. In these drawings, the same or corresponding parts as those in the fourth embodiment are designated by the same reference numerals, and the description thereof is omitted.

  In the seventh embodiment, the insulating sheet 91 is pasted on the lead wire portion 41 constituting the thermal fuse 40 and the heat collecting portion 77 in the fourth embodiment. The insulating sheet 91 is bonded to the protruding wall 73 from the inside to the outside so as to cover the tip of the protruding wall 73. Further, a hole 92 is provided at a position of the insulating sheet 91 where the temperature fuse 40 abuts. Other configurations are the same as those in the fourth embodiment.

When the thermal fuse 40 is arranged at the contact portion between the holder 71 (in this case, the protruding wall 73 of the holder 71) and the brush sleeve 32, the arrangement location is narrow and it is difficult to insulate the thermal fuse 40.
The seventh embodiment has been made in view of such a problem, and only the insulating sheet 91 is attached to the thermal fuse 40 and the lead wire portion 41, so that the gap between the thermal fuse 40 and the brush sleeve 32 can be reduced. Insulation can be performed easily. Moreover, since the hole 92 is provided in the part of the thermal fuse 40, the thermal conductivity with respect to the thermal fuse 40 is made good and the sensitivity of the thermal fuse 40 is kept good.

  Next, an eighth embodiment will be described based on FIGS. In the eighth embodiment, a temperature fuse used as a detection element is attached to the holder as in the fourth embodiment, but the attachment position is different. That is, in Example 8, a thermal fuse is provided so as to protrude from the cylindrical wall of the holder toward the rectifying terminal side of the brush. FIG. 31 is a perspective view of a brush assembly according to Embodiment 8 of the present invention. FIG. 32 is a perspective view of the same angle as that of FIG. 31 and is a state diagram before the protruding piece covering the thermal fuse is bent. FIG. 33 is a single view of the brush sleeve constituting the brush assembly, where (a) is a view of the brush sleeve as seen from the side in the longitudinal direction, and (b) is a view as seen from the arrow B in FIG. Yes, (c) is a C arrow view in FIG. FIGS. 34A and 34B are explanatory views of the manufacturing method of the brush sleeve, wherein FIG. 34A is an intermediate process stage diagram and FIG. 34B is a final process stage diagram. In these drawings, the same or corresponding parts as those in the fourth embodiment are designated by the same reference numerals, and the description thereof is omitted.

  In the eighth embodiment, as in the fourth embodiment, a protruding wall 73 extending from the wall on the rectifying terminal side of the brush in the cylindrical portion 72 of the holder 71 to the tip portion of the brush sleeve 32 is provided. As shown in FIG. 32, the thermal fuse 40 is attached in a state of protruding from the protruding wall 73 by further protruding the lead wire portion 41 from the protruding wall 73. Moreover, the brush sleeve 32 is provided with the protrusion piece 101 as FIG.31, FIG.32 and FIG.34 shows. The protruding piece 101 is formed in a size convenient for folding and covering the thermal fuse 40.

  The brush sleeve 32 in the eighth embodiment has a cylindrical shape substantially the same as in the first and fourth embodiments, and has a pair of flat walls 32a and a mountain wall 32b connecting the flat walls 32a. The central portion of the angle wall 32b is divided into two, and a flange portion 32c is formed at the joint. Further, the brush sleeve 32 has a substantially target shape with a central surface orthogonal to the rotation shaft 8 of the amateur 5 as a target surface, and forms a flange portion 32c protruding from the cylindrical container on the target surface. The flange portions 32c are joined to overlap each other. Further, the brush sleeve 32 is manufactured by bending a single plate, and at one end portion (on the side opposite to the commutator), a protrusion for forming a lid member that closes one end of the brush sleeve 32 is formed. A piece 103 is provided. A coil spring 33a (see FIG. 1) that elastically biases the brush 33 toward the commutator 9 is supported by the lid member. On the opposite side (commutator 9 side), a protruding piece 101 that is bent and covered so as to enclose the thermal fuse 40 is formed.

  As shown in FIG. 34 (a), the brush sleeve 32 forms a long half of the half-shaped portion at the intermediate stage of manufacturing from a single plate, and the flange is formed at the end position Y on the rectifying terminal side. It cut | disconnects leaving the part 32c, and bend | folds so that edge parts may become the same position (refer FIG.34 (b)). Further, at the time of cutting before bending, a protruding piece 101 is formed on one side, and a notch 102 having a size corresponding to the protruding piece is formed on the other side.

Since the eighth embodiment is configured as described above, it is possible to prevent the generated spark from directly touching the thermal fuse 40 as the detection element 35, thereby preventing the detection element 35 from being deteriorated. Further, since the spark directly hits the protruding piece 101, the detection element 35 can directly collect the heat from the spark in a wide range that is larger than its own area. Therefore, the temperature of the detection element 35 can be increased instantaneously, and an excessive spark can be detected quickly.
In the eighth embodiment, since the notch 102 is formed in the half portion on the side where the protruding piece 101 that covers the detection element 35 is not formed, the heat of the excessive spark can be concentrated on the detection element side. it can. Thereby, the sensitivity of the excessive spark detection by the detection element 35 is further improved.
Moreover, since the notch 102 is automatically formed by the formation of the protruding piece 101, the cutting can be efficiently performed. Moreover, since the brush sleeve 32 is formed of a single plate, it can be manufactured at low cost.

  Next, a ninth embodiment will be described based on FIGS. Example 9 shows another production method of a brush sleeve in place of Example 8, and can be used as the brush sleeve in Example 8. FIG. 35 is a single view of a brush sleeve according to Example 9 of the present invention, in which (a) is a view of the brush sleeve as viewed from the side in the longitudinal direction, and two brush sleeves are shown side by side, (b) is the same. It is a B arrow view in (a). FIG. 36 is an explanatory view of the manufacturing method of the brush sleeve, wherein (a) is a view seen from the side in the longitudinal direction of the final process step diagram, and (b) is a view taken in the direction of arrow B in (a). .

The brush sleeve 111 according to the ninth embodiment is basically usable in place of the brush sleeve 32 in the eighth embodiment, and has the same length dimension and substantially the same as the brush sleeve 32 in the eighth embodiment. It has a cross-sectional shape.
That is, the brush sleeve 111 according to the ninth embodiment has a cylindrical shape, and includes a pair of flat walls 111a, a mountain wall 111b connecting the flat walls 111a, and a protrusion having the same function as the protruding piece 101 in the eighth embodiment. It has a piece 112 and is joined at the center of one angle wall 111b.

  Therefore, when manufacturing this brush sleeve 111, a long one having a shape opened at the central portion of the unjoined mountain-shaped wall 111b is manufactured, and this is cut to an appropriate brush sleeve length, as shown in FIG. Thus, it is manufactured by bending and joining. At this time, the protruding pieces 112 are cut so as to be integrally formed. In addition, the notch 113 is formed after the projecting piece 112 is cut off, but this notch is not on the commutator 9 side, and does not have the same meaning as the notch 102 in the eighth embodiment. Further, in this brush sleeve 111, the protruding piece 103 as the support member of the coil spring 33a that elastically urges the brush 33 toward the commutator 9 in the eighth embodiment is not integrally formed, so that it is manufactured as a separate member. Need to be installed.

  Since the brush sleeve 111 according to the ninth embodiment is configured as described above, the cutting is efficiently performed. Moreover, since the brush sleeve 111 is formed of a single plate, it can be manufactured at low cost.

  Next, Example 10 will be described with reference to FIGS. Example 10 is a further improvement of the brush assembly of Example 1. FIG. 37 is a perspective view of the brush assembly according to the tenth embodiment as viewed from the substrate side, FIG. 38 is a perspective view of the brush assembly as viewed from the brush sleeve side, and FIG. 39 is a perspective view of the brush assembly. FIG. 40 is a perspective view of the brush assembly in a state in which the substrate is being attached, and FIG. 41 is a shaft end of the rotating shaft of the motor in the state in which the substrate is being attached in the brush assembly. 42 is a side view seen from the side, FIG. 42 is a perspective view showing a combined state of the brush sleeve and the substrate in the brush assembly, and FIG. 43 is a perspective view seen from the brush sleeve side of the holder alone in the brush assembly. 44 is a perspective view seen from the substrate side of the brush assembly, and FIG. 45 is a perspective view of the brush assembly. Rashisuribu is a perspective view of a single. In these drawings, the same reference numerals are assigned to the same portions as those in the first and eighth embodiments.

  As in the case of the first embodiment, the brush assembly 30 according to the tenth embodiment includes a holder 31, a brush sleeve 32, a brush 33, a substrate 34, a detection element 35, and the like, as shown in FIGS. ing.

  The holder 31 is made of an insulating material made of a thermosetting synthetic resin such as a phenol resin having electrical insulation, as in the first embodiment, and includes a holder body 36 and a mounting flange 37. Further, as shown in FIGS. 43, 44 and the like, the holder 31 includes a cylindrical portion 130 for holding the brush sleeve 32 at the center portion. The cylindrical portion 130 is provided with a through hole 131 for penetrating the same brush sleeve 32 as described in the eighth embodiment and a through hole 132 for penetrating the substrate 34. Further, groove portions 133 and 134 for positioning the flange portion 32c in the central portion of the mountain wall 32b of the brush sleeve 32 are formed in the tubular portion 130 so as to face each other. One groove 134 communicates with the through hole 132.

  When the cylindrical portion 130 is assembled as the brush assembly 30, the cylindrical portion 130 becomes a portion inserted into the through hole 11 of the bracket 3 described above. By inserting the cylindrical portion 130 into the through hole 11, the mounting flange 37 is overlaid on the outer surface of the peripheral wall of the bracket 3, and the mounting flange 37 is fixed to the bracket 3 with screws 39 as shown in FIG. Has been. By fixing the holder 31 to the bracket 3 in this way, the brush assembly 30 is fixed to the bracket 3.

As described above, the brush sleeve 32 in the tenth embodiment is the same as that shown in the eighth embodiment. However, as shown in FIG. 45, a protrusion 135 is formed at the central portion of the angled wall 32b. . The protrusion 135 also serves as a caulking member that joins between the flange portions 32c overlapped at the central portion of the angle wall 32b. Note that the protrusion 135, which is a caulking member, is omitted in the description of the eighth embodiment. Since points other than those described above are the same as those in the eighth embodiment, description thereof is omitted.
The brush 33 is the same as that in the first embodiment.

  The substrate 34 is a plate made of an insulating material, and is inserted into the through-hole 132 of the holder 31 from the rotary shaft 8 side so that one end protrudes to the outside of the holder 31 as shown in FIGS. The brush sleeve 32 is attached along the mountain wall 32b. The dimension L1 (see FIGS. 37 and 42) of the portion 141 on the rotating shaft side of the substrate 34 is a portion 142 other than the portion 141 on the rotating shaft side, such as a portion penetrating the holder 31 or a portion outside thereof. Is larger than the dimension L2 in the direction of the rotation axis (see FIGS. 37 and 42), and is substantially T-shaped.

  As shown in FIGS. 38 to 42, an axial lead type thermal fuse 40 is attached as a detection element 35 on the brush sleeve 32 side of the rotary shaft side portion 141 so as to be parallel to the rotary shaft 8. The lead wire portion 41 of the thermal fuse 40 is coated with a flame-retardant silicon adhesive as an insulating material. This insulating material can bring about an effect of reducing the distance between the lead wire portion 41 and the commutator 9, the brush sleeve 32, and the brush 33 by improving the insulation.

  A hole 143 into which the protrusion 135 provided on the brush sleeve 32 is fitted is provided in a portion of the portion 142 located outside the holder 31. In the holder 31, a gap 138 is formed between the substrate 34 and the wall surface on the extension of the anti-sleeve side wall surface of the through hole 132 outside the holder 31 in the assembled state in which the substrate 34 is passed through the through hole 132. It is configured. With this configuration, when the substrate 34 is inserted into the through hole 132 of the holder 31 from the rotation shaft 8 side, the substrate 34 can easily get over the protrusion 135 and protrude outside.

  Circuit patterns 144 and 145 as detection elements 35 are formed on the side of the sleeve 34 opposite to the sleeve. Furthermore, a terminal (not shown) for connecting to the control unit of the commutator motor 1 is attached to the end 146 located outside the holder 31 of the circuit patterns 144 and 145.

  To assemble the brush assembly 30, the brush sleeve 32 incorporating the brush 33 is inserted into the through hole 131 of the holder 31. Next, the substrate 34 to which the thermal fuse 40 is attached is inserted into the through hole 132 of the holder 31. At this time, the substrate 34 is elastically bent as shown in FIGS. 40 and 41, gets over the protrusion 135, and is inserted to a predetermined position. And when the board | substrate 34 will be in the state inserted to the predetermined position, the processus | protrusion 135 will be inserted in the through-hole 143 of the board | substrate 34, and the board | substrate 34 is fixed by this. The substrate fixing means in this embodiment is composed of the protrusions 135 and the through holes 143 as described above.

Since Example 10 is configured as described above, the following effects can be obtained.
Since the thermal fuse 40 is attached to the sleeve 32 side of the portion 141 on the rotating shaft side of the substrate 34, the thermal fuse 40 is attached at a position closest to the spark generated on the rectifying terminal side of the brush 33 tip. become. For this reason, the temperature from the spark can be detected by the entire temperature fuse 40, the temperature fuse 40 can be operated instantaneously when an excessive spark occurs, and the generation of a strange odor and smoke generation after the occurrence of the spark is greatly reduced. Can do.

  Further, since the thermal fuse 40 uses a mass-produced axial lead wire type, it is inexpensive and has stable characteristics. Furthermore, since the lead wire portion 41 is also hard, it can be easily and stably installed compared to solder or the like, and the operation variation due to component mounting is small and the reliability is high. In addition, the axial lead wire type thermal fuse 40 has an outer surface made of ceramic and epoxy, and therefore is flame retardant, suitable for a use environment exposed to sparks, and has a cylindrical shape so that the area perceived by sparks is large. Increases sensitivity.

  The brush assembly 30 can be assembled by inserting the brush sleeve 32 incorporating the brush 33 into the through hole 131 of the holder 31 and then inserting the substrate 34 with the thermal fuse 40 attached into the through hole 132 of the holder 31. it can. Furthermore, since the thermal fuse 40 can be attached to the optimum position by a simple method of inserting the brush assembly 30 into the bracket 3, variations during assembly can be reduced, and the sensitivity of the thermal fuse 40 is improved. .

  Further, in this assembly, the brush sleeve 32 has a protrusion 135 on the side surface on the rectifying end side located outside the holder 31, and has a through hole 143 into which the protrusion 135 is inserted into the substrate 34. It is not necessary to increase the number of parts for mounting the substrate 34, and the cost can be reduced.

  In addition, the holder 31 is configured so as to form a gap 138 between the substrate 34 and the wall surface on the extension of the side wall surface of the through-hole 143 opposite the sleeve, outside the holder 31 in a state where the substrate 34 is penetrated. Therefore, when the substrate 34 is inserted into the holder 31, the substrate 34 can be bent toward the half sleeve side by using the gap 138. Therefore, the protrusion 135 of the brush sleeve 32 can be easily fitted into the through hole 143 of the substrate 34, and the flexure of the substrate 34 returns after the fitting, so that the locking can be easily realized. As a result, the substrate 34 can be attached and fixed more easily without increasing the number of parts, and the cost can be further reduced.

  Further, since the substrate 34 is coated with a flame retardant silicon adhesive as an insulating material on the lead wire portion 41 of the thermal fuse 40, the commutator 9 and the brush sleeve 32 can be obtained by a simple method of applying an adhesive. And the insulation with the charging part of the brush 33 can be performed reliably, and the intensity | strength with respect to the vibration of the temperature fuse 40 as the detection element 35 can also be improved.

  In addition, the substrate 34 is formed so that the dimension L1 in the rotation axis direction of the mounting portion of the thermal fuse 40 is larger than the dimension L2 in the same direction on the outer side and the part penetrating the holder 31. The through hole can be made small, and the enlargement of the brush assembly 30 and the enlargement of the motor can be avoided.

Electric circuit example 1

  Next, electric circuit example 1 of the commutator motor according to Examples 1 to 10 will be described with reference to FIG.

In the electric circuit shown in FIG. 46, the control circuit 121 and the commutator motor 1 are connected in series to the AC power source 122 in the same manner as a conventional one. The control circuit 121 includes a power supply circuit 123 and a phase control circuit 124. Further, the phase of the triac TRA is controlled by the diac in the phase control circuit 124 via the photocoupler 125 to control the rotation speed of the commutator motor 1. The phase control circuit 124 is connected to a motor temperature detection circuit 126 that detects the internal temperature of the commutator motor 1. In this motor temperature detection circuit 126, a thermistor TH attached in the commutator motor 1 is connected in series to a diac in the phase control circuit 124, and the voltage at the point A divided by the thermistor TH and the resistor R1 is obtained. It is configured to perform temperature detection at the top and bottom. For example, when the temperature inside the commutator motor 1 increases, the temperature of the thermistor TH increases, the resistance of the thermistor TH decreases, and the voltage at point A becomes higher than the reference value. Accordingly, it is determined that the temperature is abnormally high, and the commutator motor 1 is stopped by cutting off the signal of the photocoupler 125. A capacitor C1 connected in parallel with the resistor R1 is a noise absorbing capacitor.
In FIG. 46, the thermal fuse 40 (or the molten material 90 depending on the temperature) in the brush assembly 30 illustrated in the first to tenth embodiments is connected in series to the power supply circuit 123 in the control circuit 121.

  Therefore, according to the example of FIG. 46, when an excessive spark is generated between the commutator 9 of the commutator motor 1 and the brush 33, it is not necessary to wait for the commutator motor 1 to be disconnected due to the temperature rise of the thermistor TH. The temperature fuse 40 (or the molten material 90 due to temperature) is blown, the power supply circuit 123 in the control circuit 121 of the commutator motor 1 is cut, and the operation of the commutator motor 1 is stopped.

According to the electric circuit example 1 configured as described above, a commutator that does not take a measure to quickly detect this when an excessive spark occurs between the commutator 9 and the brush 33 and stop the commutator motor. By using the brush assembly 30 assembled as in Examples 1 to 10 for the electric motor 1 and connecting the temperature fuse 40 (or the molten material 90 depending on the temperature) in the brush assembly 30 to the power circuit of the control circuit, It is possible to take measures when an excessive spark occurs.
In addition, since the temperature fuse 40 (or the molten material 90 due to temperature) is not connected in series to the phase control circuit 124 of the control circuit 121, this electric circuit example 1 has an advantage that it is difficult to be affected by noise.

Electric circuit example 2

  Next, an electric circuit example 2 of the commutator motor according to the first to tenth embodiments will be described with reference to FIG.

This electric circuit example 2 is obtained by changing the connection position of the thermal fuse 40 (or the molten material 90 depending on the temperature) in the electric circuit example 1.
That is, in the electric circuit example 2, in the electric circuit example 1, the temperature fuse 40 (or the molten material 90 due to temperature) is connected to the motor temperature detection circuit 126. More specifically, in the electric circuit example 2, the thermal fuse 40 (or the molten material 90 depending on the temperature) is connected in series to the thermistor TH side of the voltage dividing circuit constituted by the thermistor TH and the resistor R1.

  Therefore, in the electric circuit example 2, when an excessive spark is generated between the commutator 9 and the brush 33, the temperature fuse 40 (or the molten material 90 due to temperature) is blown, and the voltage at the point A becomes 0 volt. Then, by detecting 0 volt, it is determined that the thermal fuse 40 (or the molten material 90 due to temperature) has been operated (cut) due to an excessive spark condition. Further, the signal of the photocoupler 125 of the control circuit 121 is disconnected, and the operation of the commutator motor 1 is stopped.

  According to the electric circuit example 2 configured as described above, a commutator that does not take a measure to quickly detect this when an excessive spark occurs between the commutator 9 and the brush 33 and stop the commutator motor. The brush assembly 30 assembled as in the first to tenth embodiments is used for the electric motor 1, and the temperature fuse 40 (or the molten material 90 depending on the temperature) of the brush assembly 30 is connected to the thermistor TH in the motor temperature detection circuit of the control circuit. By connecting to the lead wire, it is possible to take measures when an excessive spark occurs.

Electric circuit example 3

  Next, electric circuit example 3 of the commutator motor according to Examples 1 to 10 will be described with reference to FIG.

This electric circuit example 3 is obtained by changing the connection position of the thermal fuse 40 (or the molten material 90 depending on the temperature) in the electric circuit example 2.
That is, in the electric circuit example 3, as in the electric circuit example 2, the temperature fuse 40 (or the molten material 90 depending on the temperature) is connected to the motor temperature detection circuit 126, but the position is constituted by the thermistor TH and the resistor R1. Is connected in series to the resistor R1 side of the voltage dividing circuit.

  Therefore, in the electric circuit example 3, when an excessive spark is generated between the commutator 9 and the brush 33, the temperature fuse 40 (or the molten material 90 due to temperature) operates (cuts), and the voltage at the point A is Rise. As a result, the voltage at the point A becomes higher than the reference voltage, and it is determined that there is an excessive spark state. The signal of the photocoupler 125 of the control circuit 121 is cut off, and the operation of the commutator motor 1 is stopped.

According to the electric circuit example 3 configured as described above, a commutator that does not take measures to quickly detect this when an excessive spark occurs between the commutator 9 and the brush 33 and stop the commutator motor. The brush assembly 30 assembled as in the first to tenth embodiments is used for the electric motor 1, and the temperature fuse 40 (or the molten material 90 depending on the temperature) in the brush assembly 30 is resistance in the motor temperature detection circuit 126 of the control circuit 121. Just by connecting to the lead wire of R1, it is possible to take measures when an excessive spark occurs.
(Modification)

  In the first to fifth embodiments, the seventh embodiment, the eighth embodiment, and the tenth embodiment, the thermal fuse 40 is used as the detection element 35. However, this can be changed to a thermistor.

  The commutator motor 1 according to the present invention can be applied to a universal commutator motor that can be used for both alternating current and direct current, and a direct current commutator motor that can be used only for direct current. The commutator motor 1 according to the present invention can be used for a vacuum cleaner, a power tool, and the like.

BRIEF DESCRIPTION OF THE DRAWINGS It is basic composition explanatory drawing of the electric blower which concerns on Example 1 of this invention, and shows the upper half from the center with a vertical sectional view. It is a perspective view of the brush assembly of the same blower motor. It is a perspective view of the holder in the brush assembly. It is a perspective view of the state which combined the brush sleeve and the board | substrate in the same brush assembly. FIG. 5 is a state diagram immediately before the substrate and the brush sleeve are assembled as shown in FIG. 4. It is a perspective view of the single-piece | unit board | substrate in the same brush assembly. It is a perspective view of the brush assembly which concerns on Example 2 of this invention. It is a perspective view in the state just before board | substrate attachment of the same brush assembly. It is a perspective view of the holder in the same brush assembly. It is the perspective view which looked at the holder of the brush assembly from the commutator side. It is a perspective view of the brush assembly which concerns on Example 3 of this invention. It is a perspective view of the holder used for the brush assembly. It is a perspective view of the brush sleeve of the state which inserted the brush. It is a perspective view of the brush sleeve in the same brush assembly, Comprising: The state which inserted the brush is shown. It is a perspective view of the board | substrate in the same brush assembly. It is a perspective view of the brush assembly which concerns on Example 4 of this invention. It is the figure which looked at the same brush assembly from the commutator side, and is a state figure which has not inserted a brush sleeve and a brush. It is the state figure which attached the brush sleeve to the same brush assembly, Comprising: It is an enlarged view around a brush sleeve. FIG. 3 is an enlarged perspective view around a thermal fuse in the brush assembly. FIG. 18 is an enlarged view around a thermal fuse in FIG. 17. It is a perspective view of the brush assembly which concerns on Example 5 of this invention. It is the figure seen from the brush side of the brush assembly. It is a perspective view of the thermal fuse assembly in the same brush assembly. It is a perspective view of the brush assembly which concerns on Example 6 of this invention. FIG. 3 is an enlarged perspective view around a detection element in the brush assembly. It is a perspective view of the molten substance assembly as a detection element in the same brush assembly. It is a perspective view of the brush assembly which concerns on Example 7 of this invention. FIG. 3 is a perspective view of the periphery of the detection element as viewed from the brush sleeve side in a state where the brush sleeve is partially removed in the brush assembly. It is a perspective view of the same angle as FIG. 27, Comprising: It is a figure which shows the state which peeled off the insulating sheet. It is a perspective view of the angle substantially the same as FIG. 28, Comprising: It is a figure which shows the state which peeled the insulating sheet. It is a perspective view of the brush assembly which concerns on Example 8 of this invention. FIG. 32 is a perspective view of the same angle as in FIG. 31, and is a state diagram before bending a protruding piece that covers the thermal fuse. It is the single figure of the brush sleeve which comprises the same brush assembly, (a) is the figure which looked at the brush sleeve from the longitudinal direction side, (b) is the B arrow view in the same figure (a), ( c) is a C arrow view in FIG. It is explanatory drawing of the manufacturing method of the same brush sleeve, Comprising: (a) is an intermediate process step figure, (b) is a final process step figure. It is the single figure of the brush sleeve which concerns on Example 9 of this invention, Comprising: (a) is the figure which looked at the brush sleeve from the longitudinal direction side surface, and has arranged two pieces, (b) is the same ( It is a B arrow view in a). It is explanatory drawing of the manufacturing method of the brush sleeve, Comprising: (a) is the figure seen from the longitudinal direction side surface of the last process step figure, (b) is a B arrow view in the same (a). It is the perspective view seen from the board | substrate side of the brush assembly which concerns on Example 10. FIG. It is the perspective view seen from the brush sleeve side of the same brush assembly. It is the side view which looked at the same brush assembly from the shaft end side of the rotating shaft of an electric motor. It is a perspective view of the same brush assembly in the state in the middle of attachment of a substrate. It is the side view seen from the axial end side of the rotating shaft of the electric motor in the state in the middle of attachment of the board | substrate in the same brush assembly. It is the perspective view which showed the combination state of the brush sleeve and board | substrate in the same brush assembly. It is the perspective view seen from the brush sleeve side of the holder single-piece | unit in the same brush assembly. It is the perspective view seen from the board | substrate side of the same brush assembly. It is a perspective view of the brush sleeve single-piece | unit in the same brush assembly. It is an example of the electric circuit of the commutator motor which concerns on this invention. It is another example of the electric circuit of the commutator motor which concerns on this invention. It is the further another example of the electric circuit of the commutator motor which concerns on this invention.

Explanation of symbols

DESCRIPTION OF SYMBOLS 1 Commutator motor 3 Bracket 4 Stator 5 Amateur 8 Rotating shaft 9 Commutator 30 Brush assembly 31 Holder 32 Brush sleeve 32a Flat wall 32b Angle wall 32c Flange part 33 Brush 34 Substrate 35 Detection element 36 Holder body 37 Mounting flange 38 Cylindrical part 40 Thermal fuse 41 Lead wire part 42 Insulating sheet 43 Circuit pattern 45 Projection part 46 Through hole 51 Substrate 52 Notch 53 Holder 54 Slit 55 Projection part 56 Cylindrical part 61 Substrate 62 Projection part 63 Hole part 64 Holder 65 Cylindrical part 66 Slit 67 Projection 71 Holder 72 Cylindrical part 73 Projection wall 74 Recess 75 Hole 76 Terminal 77 Heat collection part 87 Heat collection part 90 Molten material 91 Insulation sheet 92 Hole 101 Projection piece 102 Notch 103 Projection piece 111 Brush sleeve 111b Mountain wall 111a Flat Wall 112 protruding piece 113 cutting 121 control circuit 122 AC power supply 123 power supply circuit 124 phase control circuit 125 photocoupler 126 motor temperature detection circuit 130 cylindrical part 131 through hole 132 through hole 133 groove part 134 groove part 135 projection 137 wall 138 gap 141 part 142 part 143 through hole 144 circuit pattern 146 End R1 Resistance TH Thermistor TRA Triac L1 Dimension L2 Dimension

Claims (33)

Stator, amateur, commutator connected to the armature, brush for supplying power to the commutator, brush sleeve for inserting the brush, holder for holding the brush sleeve, and brush sleeve near the commutation terminal side of the brush tip And a substrate disposed along the side surface of the brush sleeve on the rectifying terminal side,
The substrate has a detection element mounted on the sleeve side surface, and a circuit pattern of the detection element is arranged on the opposite side surface thereof.
When the detection element detects an excessive spark on the rectifying terminal side of the brush tip by detecting a temperature rise of the brush sleeve near the rectifying terminal side of the brush tip, the motor stops. A commutator motor characterized by being configured as described above.   2. The commutator motor according to claim 1, wherein the detection element comprises a temperature fuse.   The detection element is an axial lead wire type thermal fuse, and on the detection element mounting surface side of the substrate, an insulating sheet is attached to a lead wire portion protruding linearly from both sides of the thermal fuse. The commutator motor according to claim 1, wherein   2. The commutator motor according to claim 1, wherein the detection element is a thermistor.   2. The commutator motor according to claim 1, wherein the detection element is made of a molten material connected between the lead wires of the brush.   2. The commutator motor according to claim 1, wherein the substrate is fixed to a holder along a side surface of the brush sleeve on a rectifying terminal side.   The substrate is disposed along a side surface of a brush sleeve formed in a direction orthogonal to the rotation axis of the amateur, and the detection element is attached to a rectifying terminal side on the brush sleeve side surface of the substrate. The commutator motor according to claim 1, wherein   The substrate fixing means for fixing the relative positional relationship between the brush sleeve and the substrate is formed at a contact portion between the brush sleeve and the substrate, according to any one of claims 1 to 7. Commutator motor.   9. The commutator motor according to claim 8, wherein the substrate fixing means includes a protrusion formed on the brush sleeve and a through hole formed in the substrate so that the protrusion can be inserted.   The substrate fixing means includes a protrusion formed on the brush sleeve and a through-hole formed in the substrate so as to be able to penetrate the protrusion, and the protrusion penetrates the protrusion through the through-hole of the substrate. 9. The commutator motor according to claim 8, wherein the commutator motor is configured to bend and fix the substrate at a predetermined position.   The commutator motor according to claim 6, wherein a substrate positioning means for positioning the substrate is formed at a joint portion between the substrate and the holder.   12. The substrate positioning means is configured by fitting a protrusion formed on one of the substrate and the holder and a recess formed on either the substrate or the holder. The commutator motor described.   The brush sleeve is cylindrical, has a target shape with the center surface in the direction of the rotation axis of the amateur as a target surface, and the flange portions protruding from the cylindrical container on the target surface overlap each other. In addition, when the brush sleeve is manufactured, a long object having the shape of a half before joining is formed, and then the length of the long object becomes the commutator side end. The commutator according to any one of claims 1 to 12, wherein the commutator is cut by leaving a flange portion at a position, and the flange portion is bent in the length direction of the brush sleeve at the cutting position. Electric motor. Stator, amateur, commutator connected to the armature, brush for supplying power to the commutator, brush sleeve for inserting the brush, holder for holding the brush sleeve, and brush sleeve near the commutation terminal side of the brush tip A detecting element for detecting the temperature of
The brush sleeve has a protruding piece that protrudes further from the tip portion on the commutator side,
The detection element is attached to the holder so as to protrude from the holder to the vicinity of the rectifying terminal end of the brush tip, and is covered by bending the protruding piece. Further, the detection element detects a temperature rise of the protruding piece. Thus, the commutator motor is configured to stop the motor when the occurrence of an excessive spark is detected on the commutation terminal side of the brush tip.   The brush sleeve is cylindrical, has a target shape with the center surface in the direction of the rotation axis of the amateur as a target surface, and the flange portions protruding from the cylindrical container on the target surface overlap each other. In addition, when the brush sleeve is manufactured, a long object having the shape of a half before joining is formed, and then the length of the long object becomes the commutator side end. The flange portion is left at the position, and a cut piece is formed by forming a protruding piece on the cut portion on one side and cutting the protruding piece on the other side, and the flange portion is brushed at this cutting position. The commutator motor according to claim 14, wherein the commutator motor is formed by being bent in a length direction of the sleeve. Stator, amateur, commutator connected to the armature, brush for supplying power to the commutator, brush sleeve for inserting the brush, holder for holding the brush sleeve, and brush sleeve near the commutation terminal side of the brush tip A detecting element for detecting the temperature of
Further, the detection element is such that the longitudinal direction of the detection element is directed to the longitudinal direction of the brush sleeve at the contact portion between the brush tip and the holder near the rectifying terminal side, and the side surface of the detection element is the holder. It is inserted into a recess formed in the brush sleeve side surface of the holder so as to slightly protrude from the brush sleeve side surface of the holder,
When the detection element detects an excessive spark on the rectifying end side of the brush tip by detecting a temperature rise of the brush sleeve near the rectifying end side of the brush tip, the motor stops. A commutator motor characterized by being configured as described above. Stator, amateur, commutator connected to the armature, brush for supplying power to the commutator, brush sleeve for inserting the brush, holder for holding the brush sleeve, and brush sleeve near the commutation terminal side of the brush tip A detecting element for detecting the temperature of
Further, the detection element includes a thermal fuse arranged at a contact portion between the brush sleeve and the holder near the rectifying termination side of the brush tip portion, and a part of the lead wire portion of the thermal fuse is near the rectifying termination side of the brush. And a heat collecting part arranged in
When the detection element detects an excessive spark on the rectifying end side of the brush tip by detecting a temperature rise of the brush sleeve near the rectifying end side of the brush tip, the motor stops. A commutator motor characterized by that.   The commutator motor according to claim 17, wherein the heat collecting part is formed in a non-linear shape.   18. The commutator motor according to claim 17, wherein a lead wire portion of the thermal fuse is formed so as to be covered with an insulating sheet obtained by cutting out the thermal fuse portion. The stator, the armature, the commutator connected to the armature, the brush that supplies power to the commutator, the brush sleeve that inserts the brush, the holder that holds the brush sleeve, and the temperature near the commutation terminal side of the brush tip A detecting element for detecting,
The detection element is made of a molten material connected to a lead wire protruding from a holder located near the rectifying terminal side of the brush tip,
The electric motor stops when the detection element detects that an excessive spark has occurred on the rectifying terminal side of the brush tip by detecting a temperature rise near the rectifying terminal side of the brush tip. And commutator motor. A stator, an armature, a bracket containing the stator and the armature, a commutator connected to the armature, a brush for supplying power to the commutator, a brush sleeve for inserting and attaching the brush into the bracket, and a brush sleeve A holder for fixing to the bracket, a detection element for detecting the temperature in the vicinity of the rectifying terminal side of the brush tip, and a penetrating holder from the commutator side so as to extend along the side surface of the brush sleeve on the rectifying terminal side. And a substrate arranged to
In the substrate, a circuit pattern of the detection element is disposed on the side opposite to the sleeve, and a terminal portion is formed outside the holder of the circuit pattern,
Furthermore, the detection element is composed of an axial lead wire type thermal fuse attached to the side of the sleeve of the board so that the axis of rotation of the armature is parallel to the armature, and an excessive spark is generated on the rectifying terminal side of the brush tip. A commutator electric motor that operates to stop the electric motor when the motor is stopped.   The commutator motor according to claim 21, wherein the brush sleeve has a protrusion on a side surface on the rectifying end side located outside the holder, and the substrate has a through hole into which the protrusion is inserted.   The holder is configured such that a gap is formed between the substrate and the wall surface on the extension of the anti-sleeve sidewall surface of the through hole that penetrates the substrate on the outside side of the assembled state where the substrate is penetrated. The commutator motor according to claim 22.   The commutator motor according to any one of claims 21 to 23, wherein the substrate is coated with a flame-retardant silicon adhesive as an insulating material on a lead wire portion of a thermal fuse.   25. The substrate according to any one of claims 21 to 24, wherein a dimension of the thermal fuse mounting portion in the direction of the rotation axis is larger than a dimension of the holder penetrating portion and the outside in the same direction. The commutator motor described.   The commutator motor according to any one of claims 2, 3, 17 to 19, and 21 to 25, wherein the thermal fuse is connected in series to a power supply circuit in a control circuit.   21. The commutator motor according to claim 5, wherein the detection element made of the molten material is connected in series to a power supply circuit in a control circuit.   The commutator motor according to any one of claims 2, 3, 17 to 19, and 21 to 25, wherein the thermal fuse is connected in series to a motor temperature detection circuit in a control circuit.   21. The commutator motor according to claim 5, wherein the detection element made of the molten material is connected in series to a motor temperature detection circuit in a control circuit.   The said temperature fuse is connected to the thermistor side of the voltage dividing circuit comprised by the thermistor and resistance in the motor temperature detection circuit of a control circuit, The 2, 3, 17-19 and 21-25 characterized by the above-mentioned. The commutator motor according to any one of the above.   21. The commutator motor according to claim 5, wherein the detection element made of a molten substance is connected to a thermistor side of a voltage dividing circuit composed of a thermistor and a resistor in a motor temperature detection circuit of a control circuit. .   The said temperature fuse is connected to the resistance side of the voltage dividing circuit comprised by a thermistor and resistance in the motor temperature detection circuit of a control circuit, The Claims 2, 3, 17-19, and 21-25 The commutator motor according to any one of the above.   21. The commutator motor according to claim 5, wherein the detection element made of the molten substance is connected to a resistance side of a voltage dividing circuit constituted by a thermistor and a resistor.

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