JP2013106361A - Control device-integrated rotary electric machine - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a control device-integrated rotary electric machine capable of preventing generation of excessive wear to a slip ring or a brush by preventing grease flowing into a sliding section between the slip ring and the brush even after grease seeps through a bearing.SOLUTION: On the rear side of a rotating shaft 12, a slip ring 19 and a rear bearing 11a are disposed in order from a shaft end. A rotation sensor 110 is disposed between the slip ring 19 and the rear bearing 11a. Between a sliding section between the slip ring 19 and a brush 21 and the rear bearing 11a, there is provided a disc-like slip ring protective member 27 that rotates synchronously with the rotating shaft 12 and obtains a maximum area in the perpendicular direction to the rotating shaft 12.

Description

  The present invention relates to a controller-integrated dynamoelectric machine including a controller that controls, for example, a belt-type dynamoelectric machine connected to a vehicle engine.

  Conventionally, in a belt-type rotating electrical machine connected to a vehicle engine, for example, a field-winding vehicle rotating electrical machine, a field current is supplied from a brush to a rotor field winding via a slip ring. The At this time, the brush slides while being pressed against the slip ring by a spring attached to the back of the brush. A pair of slip rings and brushes are installed on the plus side and the minus side. These brushes and slip rings are generally covered and held with an insulating mold resin or the like in order to ensure electrical insulation between the plus side and the minus side.

  When foreign matter enters the sliding contact portion between the brush and the slip ring, there is a case where the wear of the brush or the slip ring becomes an abnormal wear state where the wear proceeds abnormally. Therefore, a structure is provided between the brush holder in which the brush is accommodated and the mold resin of the slip ring to prevent entry of foreign matter and moisture from the outside.

  However, a vehicular control device-integrated rotating electrical machine such as a motor generator has a larger temperature rise when the same output current is generated than a rotating electrical machine such as an alternator, and the bearing temperature rises. It is easy to do, and since the engine start mode is provided, the belt tension is large and the load that the bearing receives is large. For this reason, grease may ooze out from the bearing that fixes the rotating shaft to the housing, and there is a concern that the oozed grease enters the sliding contact portion between the brush and the slip ring.

  Further, the slip ring and the bearing are often fixed to the rotating shaft and arranged adjacent to each other. In this case, the slip ring, the brush, and the bearing are attached to a continuous semi-closed space provided so as to prevent foreign matters from entering. For this reason, the grease that oozes out from the bearing can easily enter the sliding contact portion between the slip ring and the brush.

  Similar to foreign matter from the outside of the brush holder, this grease causes abnormal wear when it enters the sliding contact portion between the slip ring and the brush. As a result, it is difficult to prevent the abnormal wear of the slip ring and the brush, and when the abnormal wear occurs, the wear amount of the brush or the slip ring reaches the limit value much earlier than the expected life. At the same time, the rotating electrical machine becomes a cause of failure that makes it impossible to generate electricity.

  For example, in a vehicle AC generator disclosed in Japanese Patent Application Laid-Open No. 2002-159159 (Patent Document 1), a normal cooling fan and a second cooling fan are provided on the rear side end face of the rotor, and the second cooling fan is provided. A cooling fan is used to guide the cooling air around the bearing housing portion to reduce the temperature of the bearing.

  Moreover, in the rotating electrical machine for a vehicle disclosed in Japanese Patent Application Laid-Open No. 2007-074854 (Patent Document 2), a ventilation path is formed in the slinger portion of the brush holder that covers the space around the slip ring, and the cooling air is provided inside the rotating electrical machine. The cooling air is caused to flow into the slinger using the pressure difference between the inside and outside of the slinger generated when flowing through the slipper, and the temperature of the slip ring, the brush, and the bearing disposed in the vicinity thereof is suppressed.

JP 2002-159159 A JP 2007-074854 A

  The rotating electrical machine for a vehicle disclosed in Patent Document 1 or Patent Document 2 described above has a certain effect in preventing the amount of grease from flowing out from the bearing due to the effect of suppressing the temperature rise of the bearing that causes the grease of the bearing to flow out. I think that the. However, as disclosed in Patent Document 1 or Patent Document 2, in a control device-integrated rotating electrical machine with a high belt tension, only the method of reducing the temperature of the bearing prevents leakage of grease from the bearing. It is difficult to do. For this reason, when grease oozes out from the bearing, there is a problem that the slip ring and the brush cannot be prevented from flowing into the sliding contact portion, and the abnormal wear of the brush and the slip ring cannot be prevented.

  The present invention has been made to solve the above-described conventional problems, and prevents grease from flowing into the sliding contact portion between the slip ring and the brush even when grease oozes out from the bearing. A controller-integrated rotating electrical machine that prevents the occurrence of abnormal wear of a ring or brush is provided.

  The controller-integrated rotating electrical machine according to the present invention includes a rotating shaft that is rotatably supported by a housing, a rear bearing that fixes the rotating shaft on the rear side of the housing, a front bearing that fixes the rotating shaft on the front side, and the rotation A rotor fixed to the shaft and having a field core and a field winding; a slip ring mounted on the rear side of the rotating shaft and supplying a field current to the field winding; and the slip In a controller-integrated dynamoelectric machine comprising: a brush that supplies a field current to the field winding through a ring; and a brush holder that holds the brush and supplies a field current to the brush. On the rear side of the rotating shaft, the slip ring and the rear bearing are arranged in this order from the shaft end, and a rotation sensor is provided between the slip ring and the rear bearing. A disc-like shape is arranged between the sliding contact portion between the slip ring and the brush and the rear bearing so as to rotate in synchronization with the rotation shaft and to have a maximum area in a direction perpendicular to the rotation shaft. The slip ring protective member is installed.

  In the controller-integrated rotating electrical machine according to the present invention, by adopting the above-described configuration, even when grease oozes out from the bearing, the slip ring protective member acts as a protective wall against the inflow of grease into the slip ring, The grease can be prevented from flowing into the sliding contact portion between the ring and the brush. Therefore, the occurrence of abnormal wear of the slip ring or brush can be prevented.

1 is a cross-sectional view of a control device-integrated dynamoelectric machine according to Embodiment 1 of the present invention. 1 is a circuit diagram of a controller-integrated dynamoelectric machine according to Embodiment 1 of the present invention. FIG. It is sectional drawing of the slip ring vicinity of the conventional rotary electric machine for vehicles. It is an external appearance schematic diagram which shows an example of the slip ring protection board used for the control apparatus integrated rotary electric machine which concerns on Embodiment 1 of this invention. It is an external appearance schematic diagram which shows the other example of the slip ring protection board used for the control apparatus integrated rotary electric machine which concerns on Embodiment 1 of this invention. It is an external appearance schematic diagram which shows the further another example of the slip ring protection board used for the control apparatus integrated rotary electric machine which concerns on Embodiment 1 of this invention. It is an external appearance schematic diagram which shows the further another example of the slip ring protection board used for the control apparatus integrated rotary electric machine which concerns on Embodiment 1 of this invention. It is an external appearance schematic diagram which shows the further another example of the slip ring protection board used for the control apparatus integrated rotary electric machine which concerns on Embodiment 1 of this invention. It is an external appearance schematic diagram which shows the further another example of the slip ring protection board used for the rotary electric machine which concerns on Embodiment 1 of this invention. It is an external appearance schematic diagram which shows the further another example of the slip ring protection board used for the rotary electric machine which concerns on Embodiment 1 of this invention. It is an external appearance schematic diagram when the rotation sensor is installed in the slip ring protection plate shown in FIG. It is an external appearance schematic diagram of the slip ring protection board used for the rotary electric machine which concerns on Embodiment 2 of this invention.

  A preferred embodiment of a controller-integrated rotating electrical machine according to the present invention will be described below with reference to the drawings.

Embodiment 1 FIG.
A control apparatus-integrated dynamoelectric machine according to Embodiment 1 of the present invention will be described with reference to FIGS. FIG. 1 is a cross-sectional view of the controller-integrated rotating electrical machine according to the first embodiment, and FIG. 2 is a circuit diagram thereof. The controller-integrated rotating electrical machine described in the first embodiment is an AC generator motor (motor generator) for a vehicle, but may be applied to other controller-integrated rotating electrical machines.

  1 and 2, a controller-integrated rotating electrical machine (hereinafter referred to as a rotating electrical machine) 100 includes a front bracket 10 and a rear bracket 11 as housings, a bearing 10a of the front bracket 10, and a bearing 11a of the rear bracket 11. The rotary shaft 12 is supported rotatably via the front bracket 10, the front bracket 10 and the rear bracket 11, the stator 13 having the armature winding 13a, the rotary shaft 12, and the field shaft. A rotor 15 having an iron core 14 and a field winding 14a, and a pulley 16 fixed to the front end of the rotating shaft 12 are provided. The rotating electrical machine 100 is connected to an engine rotation shaft (not shown) via a belt (not shown) hung on the pulley 16. Further, since the temperature of the rotor 15 and the stator 13 rises due to the heat generated when the rotating electrical machine 100 is driven, the centrifugal fans 17 and 18 for cooling are provided on both axial end surfaces of the rotor 15. .

  Further, the rotating electrical machine 100 includes a pair of slip rings 19 mounted on the rear side of the rotating shaft 12, a brush holder 20 attached to the rear bracket 11 so as to be positioned on the rear side outer periphery of the rotating shaft 12, and the pair. A pair of brushes 21 arranged in the brush holder 20 so as to be in sliding contact with the slip ring 19 is provided.

  Further, as shown in FIG. 2, the rotating electrical machine 100 supplies a field current to the power circuit unit 22 that converts DC power into AC power or AC power into DC power, and the field winding 14 a of the rotor 15. And a control circuit unit 24 that controls the power circuit unit 22 and the field circuit unit 23, and is connected to the outside through an external connection connector and a power supply terminal (not shown).

  The power circuit unit 22 includes a plurality of power elements 22a and 22b and a heat sink 25 (see FIG. 1) that also serves as an electrode member electrically connected to the power elements 22a and 22b. The connection between the power elements 22a and 22b is performed by a conductive member (not shown) insert-molded in a mold resin and a heat sink 25, and is electrically connected to the control circuit unit 24 by a relay wiring member (not shown). Connected to.

  Here, the control circuit unit 24 includes a control circuit board (not shown) and a resin case (not shown) for housing the control circuit board. This resin case has a structure that prevents salt water from entering the control circuit board by a waterproof cover (not shown) or the like. The field circuit unit 23 can be mounted on the same substrate as the control circuit board described above, or may be configured separately from the control circuit board. Further, as shown in FIG. 2, a power unit 26 is configured by the power circuit unit 22, the field circuit unit 23, and the control circuit unit 24. The external connector is disposed in the vicinity of the control circuit unit 24 and is electrically connected to the control circuit unit 24.

  As described above, since the power elements 22a and 22b constituting the power circuit unit 22 generate heat when energized, the power circuit unit 22 is provided with a heat sink 25 for heat dissipation of the power elements 22a and 22b. The heat sink 25 is provided with a large number of fins so as to prevent an excessive temperature rise of the power elements 22a and 22b. In particular, a motor generator or the like includes a power circuit unit 22 that has both a rectification function of a generated current and an inverter function. The power elements 22a and 22b constituting the power circuit unit 22 use a switchable power semiconductor such as a MOS-FET and are formed by transfer molding together with a wiring member or a heat radiating member, or a resin case or enclosure. It is a power module covered with a silicone gel and potted. The power module is connected to a heat sink 25 and has a function of releasing heat generated in the power elements 22a and 22b to cooling air when energized.

  In the rotating electrical machine 100, the field current from the field circuit unit 23 is supplied via the brush 21 held by the brush holder 20 and the slip ring 19 attached to the rotating shaft 12. The brush 21 is pressurized by a spring (not shown) so as to slide with the slip ring 19, and heat is generated on the sliding contact surface due to friction between the two during operation of the rotating electrical machine. Moreover, in this sliding part, since the brush 21 and the slip ring 19 are held in contact, heat generation due to the electrical resistance of the contact part also occurs. Furthermore, Joule heat generation in each member accompanying energization occurs simultaneously.

  In the vicinity of the slip ring 19, a rear bearing 11 a for fixing the rotary shaft 12 is provided. The rear bearing 11 a is one of two bearings for fixing the rotary shaft 12 to the front bracket 10 and the rear bracket 11. This is a bearing closer to the slip ring 19. The rear bearing 11a is in contact with both the rotating shaft 12 and the rear bracket 11, but the rotating shaft 12 is disposed so as not to contact the rear bracket 11. Therefore, a clearance is provided between the rotating shaft 12 and the rear bracket 11. Occurs.

  In the case of a conventional rotating electrical machine, the clearance and the space inside the brush holder 20 surrounding the slip ring 19 are provided in a state where at least a part thereof is connected. As a result, the grease that oozes out from the rear bearing 11a may flow into the sliding contact portion between the slip ring 19 and the brush 21 and cause abnormal wear.

  Further, in a rotating electrical machine with an integrated control device such as a motor generator, the operation mode includes a start mode, a regenerative power generation mode, and the like in addition to the continuous power generation mode. In particular, in the case of a rotating electrical machine for a vehicle having a start mode, it is necessary to transmit a large rotational torque necessary for starting the engine to the engine via the belt, so that the belt tension becomes larger than that of an alternator or the like. In addition, in the power generation mode, when the same output current is generated as compared with the alternator, the amount of heat generated by the rotating electrical machine increases, and the temperature of the constituent members increases. As a result, in the controller-integrated rotating electrical machine, there is a concern that grease from the bearing may ooze out, and when this grease enters the sliding contact portion between the slip ring 19 and the brush 21, it causes abnormal wear. .

  Therefore, in the first embodiment, as will be described later, rotating electrical machine components are arranged on the rear side of the rotating shaft 12 in the order of the slip ring 19, the rotation sensor, and the rear bearing 11a from the shaft end. A disc-shaped slip ring protection member (hereinafter referred to as slip ring protection) is fixed to the rotary shaft 12 and perpendicular to the rotary shaft 12 between the sliding contact portion between the slip ring 19 and the brush 21 and the rear bearing 11a. 27) is provided. Thereby, even when grease oozes out from the rear bearing 11a, the oozed grease is prevented from adhering to the sliding contact portion between the slip ring 19 and the brush 21.

Here, in order to make the rotating electrical machine according to Embodiment 1 easier to understand, the conventional rotating electrical machine will be described with reference to the drawings.
FIG. 3 is a cross-sectional view of the vicinity of a slip ring of a conventional vehicular rotating electrical machine. The slip ring 19 is fixed to the rotating shaft 12, and the rotating shaft 12 is fixed to the front bracket and the rear bracket 11 via two bearings. The rear bearing 11 a installed near the slip ring 19 is inserted into the rear bracket 11 while being fixed to the rotating shaft 12, thereby fixing the rotating shaft 12 to be freely rotatable. At this time, if the rotary shaft 12 and the rear bracket 11 are in contact with each other, the rotational resistance increases, so a clearance 30 is provided between the two members. The space inside the brush holder 20 surrounding the clearance 30 and the slip ring 19 is provided in a state where at least a part thereof is connected. As a result, the grease oozing out from the rear bearing 11a can easily flow into the portion where the slip ring 19 is installed. If this grease adheres to the sliding contact portion between the slip ring 19 and the brush 21, it causes abnormal wear of the slip ring 19 and the brush 21.

  In this structure, the space surrounded by the brush holder 20, the rear bracket 11, and the rear bearing 11a is in a half-blocked state from the outside air. Since the sliding contact portion between the brush 21 and the slip ring 19 and the rear bearing 11a and the like disposed inside this space generate heat during the operation of the rotating electrical machine, the rear bearing 11a is in the space where the outside air is in a semi-blocked state. There is a problem that heat generated in the brush 21 and the slip ring 19 is accumulated, and the temperature rise increases.

  Therefore, in the rotating electrical machine according to the first embodiment, as shown in FIG. 1, the rotating electrical machine constituent members are arranged in the order of the slip ring 19, the rotation sensor (not shown), and the rear bearing 11 a from the shaft end to the rear side of the rotating shaft 12. Between the slip ring 19 and the rear bearing 11a, a slip ring protection plate 27 fixed to the rotary shaft 12 is provided. The rotating electrical machine 100 having this configuration can improve the detection accuracy of the rotation sensor by disposing the rotation sensor near the rear bearing 11 a that fixes the rotation shaft 12.

  Further, since the portion of the rotating shaft 12 to which the slip ring 19 is attached is provided so as to protrude outside the housing of the rotating electrical machine 100, the centrifugal fan 18 fixed to the rotor 12 during operation of the rotating electrical machine 100. The cooling air generated by the above is efficiently supplied to the vicinity of the brush housing portion of the brush holder 20 and the temperature rise of the brush 21 can be reduced.

  Further, since the slip ring protection plate 27 is located between the slip ring 19 and the rear bearing 11a, even if grease leaks out from the rear bearing 11a, it is prevented from flowing into the installation portion of the slip ring 19. The position of the slip ring protection plate 27 may be on the rear side or the front side of the rotation sensor. Here, when the slip ring protection plate 27 is disposed on the front side of the rotation sensor, the grease flowing out from the front bearing 10a does not adhere to the rotation sensor, and malfunction of the rotation sensor due to the adhesion of grease also occurs. Can be prevented.

  Further, the slip ring protection plate 27 has a certain clearance between the rear bracket 11 and the brush holder 20. As a result, the outside air and air can enter and exit, the discharge of heat to the outside is promoted, and the temperature rise of the rear bearing 11a is reduced. As a result, the amount of grease exuded is reduced, and the occurrence of abnormal wear is further prevented. Will improve. Further, the cooling air also flows into the sliding contact portion between the slip ring 19 and the brush 21, whereby the temperature rise of these members is reduced and the wear rate of the members is reduced.

  FIG. 4 is a schematic external view illustrating an example of a slip ring protection plate used in the rotating electrical machine according to the first embodiment. The slip ring protection plate 27 is fixed to the rotary shaft 12 and installed so as to have a maximum surface perpendicular to the longitudinal direction of the rotary shaft 12. FIG. 4 shows the shape of the slip ring protection plate 27 when it is integrally formed with the slip ring 19 shown in FIG. The detailed shape of the slip ring 19 is omitted. Due to the slip ring protection plate 27, the grease that has oozed out from the rear bearing 11 a installed on the front side of the slip ring protection plate 27 enters the slip ring 19 installed on the rear side of the slip ring protection plate 27. Can be prevented. Further, since the slip ring protection plate 27 is integrally formed with the slip ring 19, the attachment strength to the rotating shaft 12 can be increased.

  Further, since the slip ring protection plate 27 is fixed to the rotating shaft 12, it rotates at the same rotational speed as the rotating shaft 12 when the rotating electrical machine 100 is operated. At this time, when the perpendicularity of the slip ring protection plate 27 with respect to the rotation shaft 12 is low, vibration occurs, and problems such as generation of noise and deterioration of the reliability of the slip ring protection plate 27 itself occur. However, when the slip ring protection plate 27 is integrally formed with the slip ring 19, it can be installed with a high degree of perpendicularity to the rotating shaft 12, and thus the above-described problems can be avoided.

  The slip ring protection plate 27 may be formed of a member different from the slip ring 19 and attached to the rotating shaft 12 with an attachment member such as caulking or snap fit. In this case, when assembling the rotating electrical machine 100, after the slip ring 19 is fixed to the rotating shaft 12, when the slip ring 19 is passed through the inner periphery of the rear bearing 11a, the slip ring protection plate 27 is configured as a separate member, The rotating electrical machine 100 can be assembled by taking the attachment method. Further, by forming the slip ring protection plate 27 as a separate member from the slip ring 19 or the like, molding becomes easy, the degree of freedom in shape is improved, and the manufacturing cost is reduced. In both the case where the slip ring protection plate 27 is integrally formed with the slip ring 19 and the case where the slip ring protection plate 27 is formed of a separate member, the slip ring protection plate 27 is made of slip ring constituent resin, resin other than slip ring constituent resin, or Consists of metal.

  FIG. 5 is a schematic external view showing another example of the slip ring protection plate. As shown in FIG. 5A, the slip ring protection plate 27a includes a first slip ring protection plate 27a1 formed integrally with the slip ring 19 and a second slip ring protection plate 27a2 fixed to the slip ring protection plate 27a2. It consists of two members. As described above, the first slip ring protective plate 27a1 is integrally formed with the slip ring 19, so that the fixing strength can be kept high and a high squareness with respect to the rotating shaft 12 can be obtained. And as shown in FIG.5 (b), the outer diameter of the slip ring protection board 27a can be enlarged more by installing so that the 2nd slip ring protection board 27a2 may be attached to the 1st slip ring protection board 27a1. In addition, since it is molded as a separate member, it becomes possible to build a complicated shape at a low cost.

  The first slip ring protection plate 27a1 and the second slip ring protection plate 27a2 are attached by an attachment member such as caulking or snap fit. Thereby, it is not necessary to newly provide a bonding member such as an adhesive, and the manufacturing cost can be reduced. Further, when the rear bearing 11a is attached through the outside of the slip ring 19 after the slip ring 19 is structurally attached to the rotary shaft 12, the outer shape of the member integrally formed with the slip ring 19 is larger than the inner diameter of the rear bearing 11a. Need to be smaller. By taking the form shown in FIG. 5, the first slip ring protection plate 27a1 is made smaller than the inner diameter of the rear bearing 11a, and after passing through the rear bearing 11a, the second slip ring protection plate 27a2 is fixed, The rotary electric machine 100 can be assembled, and a slip ring protection plate 27a having a large diameter that can be expected to prevent the inflow of high grease can be installed.

  FIG. 6 is a schematic external view showing still another example of the slip ring protection plate. The slip ring protection plate 27b is installed with a certain clearance between the rear bracket 11 and the brush holder 20, and is configured to allow outside air and air to enter and exit. This prevents grease from adhering to the sliding contact portion between the slip ring 19 and the brush 21 (see FIG. 1), and at the same time, cooling air flows through the sliding contact portion between the slip ring 19 and the brush 21 and the rear bearing 11a. , The temperature rise of each part can be reduced. Further, when the grease oozing out from the rear bearing 11a adheres to the slip ring protection plate 27b, if the rotating electrical machine 100 is in operation, it is discharged to the outside by the centrifugal force acting on the grease. As a result, the clearance between the rear bracket 11 and the slip ring protection plate 27b is not clogged with grease, and the cooling performance is not deteriorated.

  FIG. 7 is a schematic external view showing still another example of the slip ring protection plate. The slip ring protection plate 27c is provided with a circumferential protrusion 27c1 on the brush holder 20 side (see FIG. 1) of the rotary shaft 12, and is combined with a recess provided in the brush holder 20 with a small gap therebetween. Thus, a labyrinth structure is formed. The slip ring protection plate 27c and a part of the brush holder 20 form a rabbling structure, thereby preventing foreign matter from entering the vicinity of the sliding contact portion between the brush 21 and the slip ring 19. Further, brush wear powder generated at the sliding contact portion between the brush 21 and the slip ring 19 can be discharged from the gap of the labyrinth structure. In addition, air in the atmosphere can enter and exit through the gaps in the labyrinth structure, and heat generated in the vicinity of the slip ring 19 can be easily discharged to the outside, and the temperature rise at the sliding contact portion can be reduced. Further, by providing the circumferential protrusion 27c1 on the slip ring protection plate 27c, the rigidity in the circumferential direction is increased and the resistance to deformation such as structural strength is improved.

  FIG. 8 is a schematic external view showing still another example of the slip ring protection plate. The slip ring protection plate 27d includes a circumferential protrusion 27d1 on the rear bearing 11a side. This prevents foreign matter from entering the rear bearing 11a directly. In addition, since the slip ring protection plate 27d includes the circumferential protrusion 27d1, it is possible to more reliably prevent the grease from flowing out. Since the circumferential protrusion 27d1 is disposed in the circumferential shape of the slip ring protection plate 27d, the rigidity in the circumferential direction is increased, and resistance to deformation such as structural strength is improved. Note that the circumferential protrusions 27c1 and 27d1 provided on the slip ring protection plates 27c and 27d in FIGS. The diameters of the two protrusions 27c1 and 27d1 do not need to match. When the diameters of the two protrusions 27c1 and 27d1 are different, the structural strength against bending can be further increased.

  Further, the center of the circumferential protrusion 27d1 provided on the slip ring protection plate 27d in FIG. Since the center of the circumferential protrusion 27d1 and the center of the rotary shaft 12 are deviated, the protrusion 27d1 rotates while changing its center in accordance with the rotation of the rotary shaft 12 while the rotating electrical machine 100 is operating. Thereby, the atmosphere in the vicinity of the rear bearing 11a is stirred and the replacement with the external atmosphere is promoted. As a result, the temperature rise of the rear bearing 11a can be reduced.

  FIG. 9 is a schematic external view showing still another example of the slip ring protection plate. A plurality of centrifugal fan-shaped protrusions 27e1 are provided on the slip ring protection plate 27e on the rear bearing 11a side. By providing a plurality of centrifugal fan-shaped protrusions 27e1 on the slip ring protection plate 27e, the ingress of grease is prevented, and the cooling air generated by the protrusions 27e1 of the rear bearing 11a is supplied to the rear bearing 11a. Reduce. Further, in order to promote the flow of the atmosphere in the space formed by the rear bracket 11 and the rear bearing 11a, the atmosphere and the external atmosphere are actively replaced. As a result, the heat released from the rear bearing 11a is exhausted to a portion where cooling air generated by the centrifugal fan 18 fixed to the rotor 15 flows.

  FIG. 10 is a schematic external view showing still another example of the slip ring protection plate. The slip ring protection plate 27f has a centrifugal fan-shaped projection 27f1 on the rear bearing 11a side, and a through hole 27f2 that allows ventilation on the rear side and front side of the slip ring protection plate 27f inside the projection 27f1. Is provided. Accordingly, when the rotor 15 rotates, the atmosphere in the vicinity of the slip ring protection plate 27f is promoted to flow. Moreover, since the atmosphere surrounded by the inside of the brush holder 20 is also activated, reduction in temperature rise of the brush 21 and discharge of brush wear powder are promoted. Further, the through hole 27f2 has a structure in which a plurality of through holes 27f2 having a mesh shape or a diameter of 3 mm or less are arranged so that the grease exuded from the rear bearing 11a does not flow out to the slip ring 19 side. Set with. FIG. 11 is a schematic external view of the vicinity when the rotation sensor 110 is installed on the slip ring protection plate 27b shown in FIG.

Embodiment 2. FIG.
Next, a rotary electric machine according to Embodiment 2 of the present invention will be described. FIG. 12 is a schematic external view of a slip ring protection plate used in the rotating electrical machine according to the second embodiment. Other configurations are the same as those of the first embodiment, and the illustration and description thereof are omitted.

  The slip ring protection plate 120 includes a rotation sensor 110 or at least a part of the rotation sensor 110, and a sensor such as a resolver or a hall sensor is installed in the rotation sensor 110. Since the slip ring protection plate 120 has a position detection function by the rotation sensor 110 or at least a part of the rotation sensor 110, the manufacturing cost and space can be reduced as compared with the case where the rotation sensor 110 and the slip ring protection plate 120 are separately mounted. (In particular, reduction of the total length of the rotating electric machine in the longitudinal direction of the rotating shaft). Further, when the rotation sensor 110 is attached to the slip ring protection plate 120, it is possible to satisfactorily attach the degree of coaxiality and perpendicularity with respect to the rotation shaft 12, thereby improving the detection accuracy and output stability of the rotation sensor 110. The rotation sensor 110 may be attached to the slip ring protection plate 120 separately or may be integrally formed with the slip ring protection plate 120.

  When a resolver is used as the rotation sensor 110, the constituent member of the slip ring protection plate 120 is an electromagnetic steel plate. At this time, parts other than the part attached to the rotary shaft 12 of the resolver are arranged on the rear bracket 11 surrounding the outer periphery of the slip ring protection plate 120. As a result, the rotational speed and position of the rotating electrical machine can be detected, and the slip ring protection plate 120 itself becomes a constituent member of the resolver, so that a part of the resolver is newly fixed to the slip ring protection plate 120. Installation space and manufacturing cost can be reduced.

  When a Hall sensor is used as the rotation sensor 110, a member having magnetism may be attached to the slip ring protection plate 120, or the slip ring protection plate 120 may be magnetized or a member having magnetism may be used. . And the part which has the receiving function of a sensor is attached to the rear bracket 11 surrounding the outer periphery of the slip ring protection plate 120. As a result, the rotational speed and position of the rotating electrical machine can be detected, and the slip ring protection plate 120 itself becomes a component of the rotation sensor 110, so that a part of the rotation sensor 110 is newly fixed to the slip ring protection plate 120. The installation space can be reduced as compared with the case of doing.

  As mentioned above, although embodiment of this invention was described, invention is not limited by these embodiments, and within the scope of the invention, combining each embodiment, or each embodiment suitably, It can be changed or omitted.

DESCRIPTION OF SYMBOLS 10 Front bracket 10a, 10b Bearing 11 Rear bracket 12 Rotating shaft 13 Stator 13a Armature winding 14 Field iron core 14a Field winding 15 Rotor 16 Pulley 17, 18 Centrifugal fan 19 Slip ring 20 Brush holder 21 Brush 22 Power Circuit part 22a, 22b Power element 23 Field circuit part 24 Control circuit part 25 Heat sink 26 Power part 27, 27a, 27b, 27c, slip ring protection member 27d, 27e, 27f, 120 slip ring protection member 27c1, 27d1, 27e1, 27f1 Projection 27f2 Through-hole 30 Clearance 100 Rotating electrical machine 110 Rotation sensor

Claims (7)

A rotating shaft rotatably supported by the housing;
A rear bearing for fixing the rotating shaft on the rear side of the housing and a front bearing for fixing on the front side;
A rotor fixed to the rotating shaft and having a field core and a field winding;
A slip ring that is mounted on the rear side of the rotating shaft and supplies a field current to the field winding;
A brush for supplying a field current to the field winding via the slip ring;
In the controller-integrated dynamoelectric machine comprising the brush holder that holds the brush and supplies a field current to the brush.
On the rear side of the rotating shaft, the slip ring and the rear bearing are arranged in this order from the shaft end, and a rotation sensor is arranged between the slip ring and the rear bearing,
A disc-shaped slip ring between the sliding contact portion of the slip ring and the brush and the rear bearing that rotates in synchronization with the rotation shaft and has a maximum area in a direction perpendicular to the rotation shaft. A controller-integrated rotating electrical machine, wherein a protective member is provided.   The slip ring protection member is made of slip ring constituent resin, resin different from slip ring constituent resin, or metal, and is formed integrally with the slip ring or fixed to the rotating shaft with an attachment member. The controller-integrated rotating electrical machine according to claim 1, wherein   The slip ring protection member includes a first slip ring protection member formed integrally with the slip ring, and a second slip ring protection member fixed to the first slip ring protection member. The control apparatus-integrated dynamoelectric machine according to claim 1 or 2, characterized in that   The slip ring protection member includes a circumferential protrusion on a surface on the slip ring side of a surface perpendicular to the rotation axis, and forms a labyrinth structure by combination with a recess formed in the brush holder. The control apparatus-integrated dynamoelectric machine according to any one of claims 1 to 3.   5. The control device integrated type according to claim 1, wherein the slip ring protection member includes a circumferential projection on a rear bearing side of a surface perpendicular to the rotation shaft. Rotating electric machine.   6. The slip ring protection member is provided with a fan-shaped protrusion on the rear bearing side, and further includes a through hole that allows ventilation between the rear side and the front side of the slip ring protection member. The control device-integrated dynamoelectric machine according to any one of the above.   The controller-integrated rotating electrical machine according to any one of claims 1 to 6, wherein the slip ring protection member includes at least a part of a rotation sensor or at least a part of the rotation sensor.

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