JP2010006573A - Braking device for motor - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide a braking device for a motor capable of preventing erroneous detection of the operating state and enhancing reliability. <P>SOLUTION: A hoisting machine for an elevator includes the motor for rotating a main sheave having a main rope wound therearound, and the braking device for stopping the motor by pressing an armature 13 against a disc 14 mounted on a rotary shaft of the main sheave. The braking device includes a striker bolt 21 screwed penetrating the armature 13, and a resin sleeve 24 that thermally expands is interposed between the striker bolt 21 and the armature 13. <P>COPYRIGHT: (C)2010,JPO&INPIT

Description

  The present invention relates to a braking device such as an elevator hoist motor or an escalator drive motor.

  2. Description of the Related Art Conventionally, as a braking device for an elevator hoist motor or an escalator drive motor, for example, a braking device disclosed in Patent Document 1 is known. In the braking device of Patent Document 1, a lining is pressed against an outer peripheral surface of a brake wheel fixed to a rotating shaft of a motor to stop the motor.

  An elevator or an escalator is operated by rotating the motor on condition that the braking device of the motor is in an inoperative state (a state where the lining is separated from the brake wheel). For this reason, high reliability is required for the means for detecting that the braking device is in an inoperative state. That is, if the motor is driven while the lining is in contact with the brake wheel, a large load is applied to the motor, causing a failure.

  For this reason, the brake device of patent document 1 detects the contact state of lining and a brake wheel by sending a weak electric current to a brake wheel through the electrode which penetrated the lining and exposed the front-end | tip to the sliding contact surface. I am doing so. In other words, when the sliding surface of the lining is separated from the outer peripheral surface of the brake wheel, it is detected that the weak tip of the electrode is separated from the brake wheel and the weak current does not flow, and the braking device is deactivated. I try to detect it.

  However, in order to detect the non-operating state with high accuracy by the braking device of Patent Document 1, the tip surface of the electrode that penetrates the lining is arranged flush with the sliding contact surface of the lining with high surface accuracy. There is a need. Normally, the tip surface of the electrode is worn with the lining, and is flush with the slidable contact surface of the lining.However, when the electrode and lining of different materials are thermally expanded, the electrode tip surface and the lining slide A minute step is formed between the contact surface.

  For example, when considering an elevator braking system, the lining needs to contact the brake wheel as soon as possible immediately after braking is started, so the gap between the sliding surface of the lining and the outer peripheral surface of the brake wheel in a non-operating state is necessary. It is desirable to reduce the gap as much as possible.

On the other hand, if the gap between the lining and the brake wheel in the non-operating state is made small for the purpose of accelerating the braking start timing, the above-mentioned step causes the lining and the brake wheel to be in contact with each other even though the lining and the brake wheel are in contact. There is also a possibility that it will be erroneously detected. In this case, as described above, the motor is driven while the lining is in contact with the brake wheel, and a large load is applied to the motor, causing a failure.
JP-A-8-240236

  An object of the present invention is to provide a braking device for a motor that can prevent erroneous detection of an operating state and can improve reliability.

  In order to achieve the above object, a braking device for a motor according to the present invention includes a disc fixed coaxially to a rotating shaft of a motor, a braking plate attached to the disc so as to be detachable from the disc, An urging member for urging the braking plate in a direction in which the slidable contact surface is pressed against the surface of the disk, and the slidable contact surface by magnetically attaching the braking plate from the back side against the urging force of the urging member Detecting that the sliding contact surface of the braking plate is in contact with the disk and the non-operating state in which the sliding contact surface of the braking plate is separated from the disk. And the detection device is attached to the electromagnet with a pusher attached to the brake plate with a tip projecting on the back side of the brake plate, and the sliding contact surface of the brake plate is Direction away from the disc When the brake plate moves, it is pressed by the tip of the pressing element and is switched to detect the non-operating state between the switching element and the pressing element due to thermal expansion of the switching element. And a mounting member that is formed of a material having a coefficient of thermal expansion that cancels out the deviation of the contact point and is interposed between the pressing element and the brake plate.

  According to the above invention, when the switch element is heated and thermally expanded by energization of the electromagnet, the mounting member interposed between the presser and the brake plate is also thermally expanded in a direction away from the switch element. Since the shift is performed, the displacement of the contact point with the pressing element due to the thermal expansion of the switch element can be offset, and the erroneous detection of the operating state of the braking device can be prevented, and the detection reliability can be improved.

  The motor braking device according to the present invention includes a disk fixed coaxially to the rotating shaft of the motor, a brake plate removably attached to the disk, and a sliding contact surface of the brake plate. An urging member for urging the brake plate in a direction to be pressed against the surface of the disk; and the brake plate is magnetized from the back side against the urging force of the urging member so that the slidable contact surface becomes the surface of the disk. An electromagnet separated from the disk, and a detection device that detects that the sliding contact surface of the brake plate is in contact with the disk and an inoperative state in which the sliding contact surface of the brake plate is separated from the disk. The detecting device has a tip projecting from the back side of the brake plate and is attached to the electromagnet, and a sliding contact surface of the brake plate is separated from the disk. The brake plate moves to And a switch element that detects that the disk is in an inoperative state by being pressed and switched by a tip of the pressing element, and a wing that generates wind by rotating the disk at the outer peripheral edge of the disk The switch element is cooled by the wind to suppress thermal expansion.

  The motor braking device according to the present invention includes a disk fixed coaxially to the rotating shaft of the motor, a brake plate removably attached to the disk, and a sliding contact surface of the brake plate. An urging member for urging the brake plate in a direction to be pressed against the surface of the disk; and the brake plate is magnetized from the back side against the urging force of the urging member so that the slidable contact surface becomes the surface of the disk. An electromagnet separated from the disk, and a detection device that detects that the sliding contact surface of the brake plate is in contact with the disk and an inoperative state in which the sliding contact surface of the brake plate is separated from the disk. The detecting device has a tip projecting from the back side of the brake plate and is attached to the electromagnet, and a sliding contact surface of the brake plate is separated from the disk. The brake plate moves to And a switch element that detects that the switch is in an inactive state by being pressed and switched by a tip of the presser, and in the vicinity of the switch element, the switch element is cooled and heated. A cooling fin for suppressing expansion is attached.

  The motor braking device according to the present invention includes a disk fixed coaxially to the rotating shaft of the motor, a brake plate removably attached to the disk, and a sliding contact surface of the brake plate. An urging member for urging the brake plate in a direction to be pressed against the surface of the disk; and the brake plate is magnetized from the back side against the urging force of the urging member so that the slidable contact surface becomes the surface of the disk. An electromagnet separated from the disk, and a detection device that detects that the sliding contact surface of the brake plate is in contact with the disk and an inoperative state in which the sliding contact surface of the brake plate is separated from the disk. The detecting device has a tip projecting from the back side of the brake plate and is attached to the electromagnet, and a sliding contact surface of the brake plate is separated from the disk. The brake plate moves to A switch element that detects that the switch element is in an inoperative state by being pressed and switched by the tip of the pressing element, and the switch element suppresses thermal expansion of the switch element. It is attached to the electromagnet via a heat insulating material.

  Furthermore, the motor braking device of the present invention includes a disk fixed coaxially to the rotating shaft of the motor, a brake plate removably attached to the disk, and a sliding contact surface of the brake plate. An urging member for urging the brake plate in a direction to be pressed against the surface of the disk; and the brake plate is magnetized from the back side against the urging force of the urging member so that the slidable contact surface becomes the surface of the disk. An electromagnet separated from the disk, and an operating state in which the sliding contact surface of the braking plate is in contact with the disk and a non-operating state in which the sliding contact surface of the braking plate is separated from the disk. The detection device has a tip projecting from the rear side of the brake plate and a presser attached to the brake plate, and is attached to the electromagnet. The sliding contact surface of the brake plate is separated from the disk in the direction of the brake. When the board moves up A switch element that detects the non-operating state by being pressed and switched by the tip of the pressing element, and the switch element is formed of a material having substantially the same coefficient of thermal expansion as the switch element. The electromagnet is attached to the electromagnet by a fixing screw.

  Since the motor braking device of the present invention has the above-described configuration and action, it is possible to prevent erroneous detection of the operating state and to improve the reliability.

Hereinafter, embodiments of the present invention will be described in detail with reference to the drawings.
FIG. 1 is a partial cross-sectional view in which a main part of a motor 1 with a braking device according to an embodiment of the present invention is partially cut. FIG. 2 is an external perspective view in which a main part of the motor 1 with a braking device is partially cut out.

  The motor 1 has a cylindrical case 2, and a rotary shaft 4 is rotatably supported via a bearing 3 on the inner central axis of the case 2. A stator 7 is attached to the inner periphery of the case 2, and drive coils 6 are wound around the salient poles of the stator 7. On the other hand, a cylindrical rotor 5 is fitted and fixed to the outer peripheral portion of the rotating shaft 4, and the outer peripheral surface of the rotor 5 and the inner peripheral surface of the stator 7 face each other with a slight gap. And if it supplies with electricity to the drive coil 6, a magnetic field will be formed, the rotor 5 will rotate and the rotating shaft 4 will rotate.

  Two electromagnetic brake mechanisms 8 a and 8 b are provided at the end portion on one end side of the case 2 so as to surround the rotating shaft 4. These two electromagnetic brake mechanisms 8a and 8b each function as a braking device of the present invention. The two electromagnetic brakes 8 a and 8 b have substantially the same structure, and are arranged adjacent to each other along the rotating shaft 4 of the drive motor 1 and aligned with one end of the case 2. In addition, an encoder 9 is disposed further outside the two electromagnetic brake mechanisms 8a and 8b. Note that at least one electromagnetic brake mechanism 8a, 8b is sufficient.

  The electromagnetic brake mechanisms 8a and 8b are respectively fixed to the electromagnets 12a and 12b, the armatures 13a and 13b (braking plates) provided so as to be movable facing the electromagnets 12a and 12b, and the rotating shaft 4 of the motor 1. The provided disks 14a and 14b and a plurality of springs 15a and 15b (urging members) for urging the armatures 13a and 13b toward the disks 14a and 14b along the axial direction are provided.

  The electromagnets 12a and 12b are each formed in a cylindrical shape that rotatably receives the rotating shaft 4, and are configured by attaching coils 11a and 11b to yokes 10a and 10b. The armatures 13a and 13b are formed in a cylindrical shape that rotatably receives the rotary shaft 4, and are attached to be movable along the common guide shaft 18 substantially parallel to the rotary shaft 4. Each armature 13a, 13b is urged in a direction away from the electromagnets 12a, 12b by a plurality of springs 15a, 15b.

  On the other hand, disks 14 a and 14 b are fixed to the rotating shaft 4. These disks 14a and 14b rotate integrally with the rotary shaft 4. The armatures 13a and 13b press the brake shoes 19a and 19b against the disks 14a and 14b by the urging forces of the plurality of springs 15a and 15b, brake the rotating shaft 4 by the friction force, and restrain the rotation.

  When releasing the braking on the rotating shaft 4, an electric current is passed through the coils 11a and 11b of the electromagnets 12a and 12b to generate an electromagnetic force in the electromagnets 12a and 12b, and the electromagnetic force resists the biasing force of the springs 15a and 15b. The armatures 13a and 13b are adsorbed from the back side, and the brake shoes 19a and 19b (sliding contact surfaces) are pulled away from the disks 14a and 14b.

  Further, by turning off the power to the coils 11a and 11b, the electromagnetic force of the electromagnets 12a and 12b is lost, and the armatures 13a and 13b are moved away from the electromagnets 12a and 12b by the biasing force of the springs 15a and 15b. Brake shoes 19a and 19b are brought into pressure contact with the disks 14a and 14b to brake the rotary shaft 4.

  FIG. 3 shows a schematic diagram of the electromagnetic brake mechanism 8 incorporating the detection device 20 for detecting the “operating state” of the electromagnetic brake mechanisms 8a and 8b described above. Here, the example which attached the one electromagnetic brake mechanism 8 adjacent to the edge part of the one end side of the case 2 of a motor is shown. FIG. 4 shows a partially enlarged schematic diagram in which the detection device 20 is enlarged. Since the detection devices 20 of the electromagnetic brake mechanisms 8a and 8b described in FIGS. 1 and 2 have the same structure, the detection device 20 of the electromagnetic brake mechanism 8 will be described here. The “operating state” here refers to an “operating state” in which the brake shoe 19 of the armature 13 is pressed against the disk 14 and an “inactive state” in which the armature 13 is separated from the disk 14.

  The detection device 20 is made of a metal striker bolt 21 (presser) attached through the armature 13 in the vicinity of the outer periphery that does not interfere with the disk 14, and a resin made of resin attached to the electromagnet 12 at a position facing the striker bolt 21. Microswitch 22 (switch element). The microswitch 22 is fixed to a notch 23 provided near the outer periphery of the electromagnet 12. As shown in FIG. 5, the notch 23 is cut from the suction surface 12 s side where the electromagnet 12 faces the armature 13.

  When the coil 11 is energized and the armature 13 is attracted to the electromagnet 12, the tip 21a of the striker bolt 21 that moves together with the armature 13 pushes the actuator 22a of the microswitch 22, and the electromagnetic brake mechanism 8 is inactivated. It is detected that the state has been reached. Further, when the coil 11 is turned off and the armature 13 is pulled away from the electromagnet 12 by the plurality of springs 15, the tip 21a of the striker bolt 21 is separated from the actuator 22a of the microswitch 22, and the electromagnetic brake mechanism 8 is in an “operating state”. Is detected. FIG. 3 shows a state in which the electromagnetic brake mechanism 8 is in the “operating state”.

  As shown in FIG. 4, the striker bolt 21 is attached to the armature 13 in a non-contact state via a substantially cylindrical resin sleeve 24 (attachment member, tubular member). The resin sleeve 24 is preferably formed of a material having the same thermal expansion coefficient as that of the microswitch 22. The striker bolt 21 is inserted and screwed into the resin sleeve 24 from the sliding contact surface side in sliding contact with the disk 14 at a position outside the outer peripheral edge that does not interfere with the disk 14.

  That is, the armature 13 is formed with a through hole 131 for screwing and attaching the resin sleeve 24. After the resin sleeve 24 is screwed into the through hole 131, the resin sleeve 24 is fixed to the armature 13 with the lock nut 25. That is, on the outer peripheral surface of the resin sleeve 24, a screw groove 24a for screwing into the screw groove 132 of the through hole 131 and screwing the lock nut 25 is formed. The thread groove 132 formed on the inner peripheral surface of the through hole 131 is formed to have a length that allows the resin sleeve 24 to be adjusted in the axial direction.

  Further, on the inner peripheral surface of the resin sleeve 24, there is formed a screw groove 24b for screwing the striker bolt 21 so that the position of the striker bolt 21 can be adjusted in the axial direction. The thread groove 24 b is formed only at a position offset toward the side close to the disk 14 along the axial direction of the resin sleeve 24. That is, the striker bolt 21 is held by the portion of the resin sleeve 24 on the disk 14 side, and the portion removed from the screw groove 24 b is free with respect to the resin sleeve 24.

  When attaching the striker bolt 21 to the resin sleeve 24, first, the lock nut 26 is screwed onto the striker bolt 21. Then, the striker bolt 21 fitted with the lock nut 26 is screwed and attached to the resin sleeve 24, and the striker bolt 21 is fixed to the resin sleeve 24 with the lock nut 26.

  That is, in the detection device 20 described above, the “operating state” and “non-operating state” of the electromagnetic brake mechanism 8 can be reliably detected by appropriately adjusting the protruding length of the tip end surface 21a of the striker bolt 21. In addition, by interposing a resin sleeve 24 between the striker bolt 21 and the armature 13, the switching point of the actuator 22 a due to the thermal expansion of the microswitch 22 (between the actuator 22 a and the tip surface 21 a of the striker bolt 21 is Undesirable shift of the contact point) can be offset, and a highly reliable detection result can be provided.

  That is, when the microswitch 22 is attached to the notch portion 23 of the electromagnet 12 as in the present embodiment, the microswitch 22 is heated and thermally expanded when the energization time to the coil 11 becomes long. At this time, as indicated by a broken line in FIG. 4, the actuator 22 a of the micro switch 22 is thermally expanded in a direction approaching the tip surface 21 a of the striker bolt 21. On the other hand, the resin sleeve 24 is also thermally expanded, and the striker bolt 21 is shifted in the axial direction away from the microswitch 22 correspondingly.

  Since the resin sleeve 24 is fixed to the armature 13 at a portion screwed into the through hole 131 of the armature 13 and a portion fixed by the lock nut 25, the portion hardly extends in the axial direction due to thermal expansion. Primarily, the portion exposed to the disk 14 side (the portion indicated by L in the drawing) extends in the axial direction by thermal expansion from the portion fixed by the lock nut 25. That is, the striker bolt 21 screwed into the resin sleeve 24 at the portion L extending by this thermal expansion is shifted so as to be pulled out slightly in the direction of the disk 14.

  In other words, since the resin sleeve 24 can be adjusted in the axial direction with respect to the through hole 131 of the armature 13 as described above, it protrudes to the outside of the through hole 131 from the portion fixed by the lock nut 25. The shift amount of the striker bolt 21 at the time of thermal expansion can be controlled by adjusting the length L of the adjusted portion to an appropriate length. That is, in consideration of the operation status and installation environment of the motor 1 with a braking device, the mounting position along the axial direction of the resin sleeve 24 is adjusted in accordance with the degree of thermal expansion of the microswitch 22, so that the micro The shift of the switching point due to the thermal expansion of the switch 22 can be offset, and a highly reliable detection result can be provided.

  On the other hand, when the striker bolt 21 is screwed directly into the through hole 131 without the resin sleeve 24 interposed, the resin microswitch 22 is more thermally expanded than the metal striker bolt 21, and therefore FIG. In the “operating state” shown in FIG. 4, the actuator 22 a (illustrated by a broken line) of the micro switch 22 and the tip end surface 21 a of the striker bolt 21 approach each other. Therefore, if the gap between the armature 13 and the disk 14 in the “non-operating state” is reduced for the purpose of accelerating the brake operation start timing, the actuator 22a and the striker are in spite of the armature 13 being in the “operating state”. As a result, the front end surface 21a of the bolt 21 remains in contact, and the operation state of the electromagnetic brake mechanism 8 cannot be detected normally.

  As described above, according to the present embodiment, since the striker bolt 21 that switches the actuator 22a of the microswitch 22 is attached to the armature 13 through the resin sleeve 24 in a non-contact state, the microswitch 22 is thermally expanded. Under the circumstances, the striker bolt 21 can also be shifted in the axial direction, and the operation state of the electromagnetic brake mechanism 8 can be detected reliably.

  Further, according to the present embodiment, the resin sleeve 24 is made of a material having a coefficient of thermal expansion that can cancel the shift of the switching point due to the thermal expansion of the microswitch 22 (the same material as the microswitch 22 in the present embodiment). Since it is formed, the amount of movement of the striker bolt 21 held by the resin sleeve 24 can be made comparable, and the shift of the switching point can be easily offset. In particular, in the present embodiment, by adjusting the length L of the portion where the resin sleeve 24 protrudes from the lock nut 25, the amount of movement of the striker bolt 21 considering thermal expansion can be controlled, and reliability without erroneous detection. Can provide high detection results.

  Furthermore, as shown in FIG. 5, it is also effective to suppress the thermal expansion of the microswitch 22 by attaching the microswitch 22 to the cutout portion 23 of the electromagnet 12 via the heat insulating material 27. In this case, since the shift amount due to the thermal expansion of the microswitch 22 is reduced, the protrusion amount L of the resin sleeve 24 for offsetting the shift can also be reduced. In particular, if the heat insulating effect by the heat insulating material 27 is high and the thermal expansion of the microswitch 22 can be almost eliminated, the resin sleeve 24 can be omitted.

  FIG. 6 is a schematic view of a disk 14 and an armature 13 of a braking device according to another embodiment of the present invention as viewed from the case 2 side of the motor. A plurality of wings 28 for generating wind generated by the rotation of the disk 14 are attached to the outer peripheral edge of the disk 14. In order to illustrate the ventilation hole 132 penetrating the armature 13, a plurality of wings 28 are omitted here. The plurality of wings 28 need only be able to generate a wind toward the striker bolt 21 attached to the armature 13, and are preferably provided at equal intervals over the entire circumference of the disk 12. However, the number of the wings 28 can be arbitrarily set. It is.

  When the motor 1 is energized and the disk 12 rotates together with the rotating shaft 4, the plurality of blades 28 rotate to generate wind. The wind generated by the wings 28 cools the vicinity of the outer periphery of the armature 13 and is blown to the electromagnet 12 through the ventilation hole 132 provided through the armature 13 around the striker bolt 21. And the wind which passed through the ventilation hole 132 cools the microswitch 22 attached to the notch part 23 of the electromagnet 12. FIG.

  As described above, also in this embodiment, since the microswitch 22 is actively cooled using the rotation of the disk 14, the thermal expansion of the microswitch 22 can be suppressed, and the thermal expansion of the microswitch 22 can be suppressed. The resulting shift amount of the switching point can be reduced, and erroneous detection of the operating state of the electromagnetic brake mechanism 8 can be prevented.

  FIG. 7 shows a schematic diagram of a main part of a braking device according to still another embodiment of the present invention. Here, the cooling fin 29 is installed in the notch 23 in which the microswitch 22 is accommodated and disposed, and the wall 23a of the notch 23 to which the microswitch 22 is fixed is actively cooled. Thereby, the heat from the electromagnet 12 energized to the coil 11 can be prevented from heating the microswitch 22 through the wall 23a, and the thermal expansion of the microswitch 22 can be prevented.

  In addition, by forming the fixing screw 221 for attaching the microswitch 22 to the wall 23a of the notch 23 with the same material as the microswitch 22, deformation of the microswitch 22 due to heat can be prevented. That is, when the resin micro switch 22 is attached with a metal fixing screw, the micro switch 22 is deformed at the screw tightening portion due to the difference in thermal expansion coefficient. In this case, after the micro switch 22 is cooled, even if the micro switch 22 contracts due to thermal contraction, a gap is formed between the micro switch 22 and the screw at the site tightened with the fixing screw. For this reason, it is effective to form the fixing screw 221 with the same resin material as the microswitch 22.

  The motor 1 with a braking device of the present invention as described above can be used, for example, as an elevator hoist. FIG. 8 shows an example in which the motor 1 with a braking device of the present invention is used as an elevator hoisting machine 31. Further, FIG. 9 shows an external view of the hoisting machine 31.

  That is, the sheave 30 is attached to the rotating shaft 4 of the motor 1 with a braking device of the present invention to form a hoisting machine 31, and the hoisting machine 31 is installed in, for example, a machine room above the hoistway 32. A rope 33 is wound around the sheave 30, the car 34 and the counterweight 35 are suspended in the hoistway 32 via the rope 33, the sheave 30 is rotated by driving the motor 1, and the car 34 is moved to the hoistway 32. Raise and lower in. Then, the operation of the electromagnetic brake mechanisms 8a and 8b of the motor 1 controls the stop and start of the raising / lowering operation of the car 34.

  Note that the present invention is not limited to the above-described embodiment as it is, and can be embodied by modifying the constituent elements without departing from the scope of the invention in the implementation stage. Various inventions can be formed by appropriately combining a plurality of constituent elements disclosed in the above-described embodiments. For example, you may delete some components from all the components shown by embodiment mentioned above. Furthermore, you may combine the component covering different embodiment suitably.

  For example, in the above-described embodiment, the case where the striker bolt 21 is attached to the armature 13 via the resin sleeve 24 has been described. However, the present invention is not limited thereto, and the microswitch 22 is used as an attachment member for attaching the striker bolt 21 to the armature 13. And a material having substantially the same coefficient of thermal expansion.

The partial expanded sectional view which partially fractures | ruptures and shows the principal part of the motor with a braking device which concerns on embodiment of this invention. FIG. 2 is an external perspective view showing a part of the motor with brake device of FIG. Schematic which shows the detection apparatus for detecting the operation state of the braking device which concerns on embodiment of this invention. The elements on larger scale which expand and show the detection apparatus of FIG. Schematic which looked at the electromagnet of the braking device from the attraction | suction surface side along line VV of FIG. Schematic which looked at the wing attached to the disk of the brake device which concerns on other embodiment of this invention from the case side of the motor. The principal part schematic of the braking device which concerns on another embodiment of this invention. Schematic for demonstrating the example which utilized the motor with a braking device as an elevator hoist. The external view of the hoisting machine of FIG.

Explanation of symbols

  DESCRIPTION OF SYMBOLS 1 ... Motor with brake device, 2 ... Case, 4 ... Rotating shaft, 8 ... Electromagnetic brake mechanism, 12 ... Electromagnet, 13 ... Armature, 14 ... Disc, 15 ... Spring, 19 ... Brake shoe, 20 ... Detection device, 21 ... Striker bolt, 22 ... micro switch, 22a ... actuator, 23 ... notch, 24 ... resin sleeve, 28 ... wing, 29 ... cooling fin, 30 ... sheave, 31 ... hoisting machine.

Claims (9)

A disk fixed coaxially to the rotating shaft of the motor;
A brake plate attached to the disc in a separable manner;
A biasing member that biases the brake plate in a direction in which the sliding surface of the brake plate is pressed against the surface of the disk;
An electromagnet that magnetically attaches the brake plate from the back side against the urging force of the urging member and separates the sliding contact surface from the surface of the disk;
A detecting device for detecting that the sliding contact surface of the braking plate is in contact with the disk and the non-operating state in which the sliding contact surface of the braking plate is separated from the disk;
The detection device is
A presser attached to the brake plate with its tip protruding on the back side of the brake plate;
When the brake plate is attached to the electromagnet and the sliding surface of the brake plate moves away from the disk, it is pressed and switched by the tip of the presser to be in an inoperative state. A switch element for detecting
An attachment member formed of a material having a coefficient of thermal expansion that cancels out the displacement of the contact point with the pressing element due to the thermal expansion of the switch element, and interposed between the pressing element and the braking plate; A braking device for a motor, comprising:   2. The brake according to claim 1, wherein the attachment member is a cylindrical member attached to a through-hole penetrating the brake plate, and the pressing element is inserted and disposed in the cylindrical member. apparatus.   The cylindrical member is attached in a state in which the position can be adjusted in the axial direction of the through hole, and the presser is attached in a state in which the position can be adjusted in the axial direction of the cylindrical member. 2. The braking device according to 2.   The braking device according to claim 3, wherein the tubular member is formed of a material having a thermal expansion coefficient substantially the same as that of the switch element. A disk fixed coaxially to the rotating shaft of the motor;
A brake plate attached to the disc in a separable manner;
A biasing member that biases the brake plate in a direction in which the sliding surface of the brake plate is pressed against the surface of the disk;
An electromagnet that magnetically attaches the braking plate from the back side against the urging force of the urging member and separates the sliding contact surface from the surface of the disk;
A detecting device for detecting that the sliding contact surface of the braking plate is in contact with the disk and the non-operating state in which the sliding contact surface of the braking plate is separated from the disk;
The detection device is
A presser attached to the brake plate with its tip protruding on the back side of the brake plate;
When the brake plate is attached to the electromagnet, and the sliding surface of the brake plate moves away from the disk, it is pressed and switched by the tip of the presser to be in an inoperative state. A switch element for detecting
A braking device for a motor having a wing for generating wind by rotation of the disk at an outer peripheral edge of the disk, and cooling the switch element by the wind to suppress thermal expansion.   The braking device according to claim 5, wherein the braking plate is formed with a ventilation hole through which wind generated by the rotation of the wing is passed. A disk fixed coaxially to the rotating shaft of the motor;
A brake plate attached to the disc in a separable manner;
A biasing member that biases the brake plate in a direction in which the sliding surface of the brake plate is pressed against the surface of the disk;
An electromagnet that magnetically attaches the brake plate from the back side against the urging force of the urging member and separates the sliding contact surface from the surface of the disk;
A detecting device for detecting that the sliding contact surface of the braking plate is in contact with the disk and the non-operating state in which the sliding contact surface of the braking plate is separated from the disk;
The detection device is
A presser attached to the brake plate with its tip protruding on the back side of the brake plate;
When the brake plate is attached to the electromagnet and the sliding surface of the brake plate moves away from the disk, it is pressed and switched by the tip of the presser to be in an inoperative state. A switch element for detecting
A motor braking device, wherein a cooling fin for cooling the switch element to suppress thermal expansion is attached in the vicinity of the switch element. A disk fixed coaxially to the rotating shaft of the motor;
A brake plate attached to the disc in a separable manner;
A biasing member that biases the brake plate in a direction in which the sliding surface of the brake plate is pressed against the surface of the disk;
An electromagnet that magnetically attaches the brake plate from the back side against the urging force of the urging member and separates the sliding contact surface from the surface of the disk;
A detecting device for detecting that the sliding contact surface of the braking plate is in contact with the disk and the non-operating state in which the sliding contact surface of the braking plate is separated from the disk;
The detection device is
A presser attached to the brake plate with its tip protruding on the back side of the brake plate;
When the brake plate is attached to the electromagnet and the sliding surface of the brake plate moves away from the disk, it is pressed and switched by the tip of the presser to be in an inoperative state. A switch element for detecting
The motor braking device, wherein the switch element is attached to the electromagnet through a heat insulating material in order to suppress thermal expansion of the switch element. A disk fixed coaxially to the rotating shaft of the motor;
A brake plate attached to the disc in a separable manner;
A biasing member that biases the brake plate in a direction in which the sliding surface of the brake plate is pressed against the surface of the disk;
An electromagnet that magnetically attaches the brake plate from the back side against the urging force of the urging member and separates the sliding contact surface from the surface of the disk;
A detecting device for detecting an operating state in which the sliding contact surface of the braking plate is in contact with the disk and a non-operating state in which the sliding contact surface of the braking plate is separated from the disk;
The detection device is
A presser attached to the brake plate with its tip protruding on the back side of the brake plate;
When the brake plate is attached to the electromagnet and the sliding surface of the brake plate moves away from the disk, it is pressed and switched by the tip of the presser to be in an inoperative state. A switch element for detecting
The motor braking device, wherein the switch element is attached to the electromagnet by a fixing screw formed of a material having substantially the same thermal expansion coefficient as the switch element.

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