JP5018642B2 - motor - Google Patents

Description

  The present invention relates to a motor in which a rotation sensor gear is attached to a rotation shaft so as to be integrally rotatable and provided with a rotation sensor that detects the rotation speed of the rotation sensor gear and detects the rotation speed of the rotation shaft.

  In general, as a motor cooling structure, for example, there is one disclosed in Patent Document 1. In Patent Document 1, brackets are fixed to both ends of a frame of a rotating electrical machine (motor) to form a housing for the rotating electrical machine. A stator core is attached to the inner peripheral surface of the frame, and a coil is wound around the stator core. The rotor is fixed to the shaft, and both ends of the shaft are rotatably supported by both brackets. Cooling blades are provided on the end face of the rotor, and air holes are formed in each bracket. In addition, a ventilation guide plate extending to the front end surface of the cooling blade is provided on the end surface of the frame.

  When the rotor rotates, a cooling action is generated by the cooling blade, air is sucked into the housing from the air hole of one bracket, and an air flow is generated in the housing (cooling air is generated). Further, this air flow is guided from the stator coil to the inner surface of the frame by the ventilation guide plate, and rotates from the air hole of the other bracket without cooling the motor drive part (stator coil etc.) by the air (cooling air). It is designed to be discharged outside the electric machine.

In general, in order to detect the rotation speed of the rotation shaft, the motor is provided with a rotation sensor gear attached to the rotation shaft so as to be integrally rotatable, and a rotation sensor for detecting the rotation speed of the rotation sensor gear. The rotation sensor gear has a large number of teeth arranged along the circumferential direction of the rotation shaft, and the rotation sensor changes the magnetic flux density penetrating through the Hall element in the rotation sensor every time the rotation sensor gear has teeth. The number of rotations is detected based on this.
JP 58-222756 A

  By the way, there is a motor in which a rotation sensor gear and a rotation sensor are provided in a housing. In such a motor, the rotation sensor gear rotates in the housing. When the rotation sensor gear rotates, a large number of teeth act like a fan, and an air flow is generated around the rotation sensor gear. . Then, for example, in a motor that sucks air into the motor and cools the motor driving unit as in Patent Document 1, the air flow that flows toward the motor driving unit due to the air flow generated around the rotation sensor gear. (Cooling air) will be disturbed. As a result, the air for cooling the motor drive unit is returned to the intake side (the air hole of one bracket in Patent Document 1), which may reduce the cooling performance of the motor drive unit.

  The present invention has been made paying attention to such problems existing in the prior art, and the purpose of the present invention is that the flow of air sucked into the housing for cooling the motor drive unit is detected by the rotation sensor gear. An object of the present invention is to provide a motor capable of preventing the motor from being disturbed by the rotation of the motor and cooling the motor drive section efficiently.

  In order to solve the above problems, the invention according to claim 1 includes a motor drive unit including a stator fixed to the inner peripheral surface of the housing and a rotor that rotates inside the stator. A rotation shaft that rotates integrally with the rotor is rotatably supported by a pair of end brackets in the housing, and a rotation sensor gear in which a large number of teeth are arranged along a circumferential direction of the rotation shaft is provided in the housing. And a rotation sensor that detects the number of rotations of the rotation shaft and detects the number of rotations of the rotation shaft, and includes an outer periphery of the rotation sensor gear in the housing. An air inlet for sucking air into the housing is formed at a position on the outer peripheral side from the surface, and is sucked into the housing. An exhaust port for exhausting air is formed, and further provided with air blowing means for sending air from the intake port toward the motor drive unit, from the outer peripheral surface of the rotation sensor gear to the outer peripheral side, from the intake port The gist is that a rectifying cover that covers the rotation sensor gear is provided so as not to disturb the air flow toward the motor drive unit.

  According to this, when the rotation sensor gear rotates in the housing to detect the number of rotations of the rotation shaft, an air flow is generated around the rotation sensor gear from the outer peripheral surface of the rotation sensor gear to the outside. In the housing, since the intake port is formed at a position on the outer peripheral side of the outer peripheral surface of the rotation sensor gear, the air flowing outward from the outer peripheral surface of the rotation sensor gear tends to flow toward the intake port. However, since the outer peripheral side of the rotation sensor gear is covered by the rectifying cover, the air flowing outward from the outer peripheral surface of the rotation sensor gear is stopped by the rectifying cover, and the air flow generated by the rotation of the rotation sensor gear is transferred to the intake port. Heading is prevented. Therefore, the air flow generated by the rotation of the rotation sensor gear prevents the air flow from the intake port toward the motor drive unit from being disturbed, and further prevents the air flow from returning to the intake port.

  The rectifying cover may be provided so as to cover the entire outer peripheral surface excluding a portion of the rotation sensor gear that faces the rotation sensor. According to this, at any position around the rotation sensor gear, it is possible to prevent the air flow flowing to the motor drive unit from being disturbed by the air flow generated by the rotation of the rotation sensor gear.

  The end bracket located on one end side of the rotation shaft of the pair of end brackets is formed with a communication passage that communicates the intake port and an internal region surrounded by a large number of teeth in the rotation sensor gear. At the same time, air may be sent to the internal region through the communication passage by rotation of the rotation sensor gear, and further air may be sent from the rotation sensor gear toward the motor drive unit.

  According to this, air can be flowed toward a motor drive part by a ventilation means and a rotation sensor gear, and a motor drive part can be cooled much more efficiently.

  According to the present invention, the air flow sucked into the housing for cooling the motor drive unit can be prevented from being disturbed by the rotation of the rotation sensor gear, and the motor drive unit can be efficiently cooled. .

(First embodiment)
Hereinafter, a first embodiment in which the motor of the present invention is embodied as a motor mounted as a drive source for an industrial vehicle will be described with reference to FIGS. 1 and 2. In the following description, for the “front” and “rear” of the motor, the direction of the arrow Y1 shown in FIG.

  As shown in FIG. 1, the frame 11 forming the housing 10 of the motor M is formed in a cylindrical shape having both ends opened. A first end bracket 12 forming the housing 10 is joined to the front end (one end) of the frame 11, and the opening on the front end side of the frame 11 is closed by the first end bracket 12. A second end bracket 13 forming the housing 10 is joined to the rear end (the other end) of the frame 11, and the opening on the rear end side of the frame 11 is closed by the second end bracket 13. The first end bracket 12 and the second end bracket 13 are opposed to each other in the axial direction of the housing 10.

  A rotary shaft 14 is accommodated in the housing 10, and a front end side (one side end) of the rotary shaft 14 is rotatably supported by a bearing 15 provided on the first end bracket 12. The end side (the other end side) is rotatably supported by a bearing 16 provided on the second end bracket 13. In the frame 11, a front intake port 11 a is formed in the frame 11 on the front end side in the axial direction of the rotating shaft 14 (hereinafter, simply referred to as the axial direction) (in FIG. 2, an interval is provided in the circumferential direction of the frame 11). 2 places) The front intake port 11 a is formed to communicate the inside of the housing 10 and the outside of the housing 10 and to suck air into the housing 10. Further, in the frame 11, rear intake ports 11 b are formed in the frame 11 on the rear end side in the axial direction (in FIG. 1, two places are spaced apart in the circumferential direction of the frame 11). The rear intake port 11 b is formed to allow the inside of the housing 10 to communicate with the outside of the housing 10 and to suck air into the housing 10.

  On the front end side of the frame 11, a front exhaust port 11 c is formed in the frame 11 at a position shifted to the center side in the axial direction from the front intake port 11 a (in FIG. 1, a gap is provided in the circumferential direction of the frame 11). 2 places) The front exhaust port 11 c is formed to communicate the inside of the housing 10 and the outside of the housing 10 and exhaust the air sucked into the housing 10 to the outside of the housing 10. Further, on the rear end side of the frame 11, a rear exhaust port 11d is formed in the frame 11 at a position shifted to the center side in the axial direction from the rear intake port 11b (in FIG. 2 places at intervals in the circumferential direction). The rear exhaust port 11d is formed to communicate the inside of the housing 10 and the outside of the housing 10 and discharge the air sucked into the housing 10 to the outside of the housing 10.

  It is desirable that the front intake port 11a and the front exhaust port 11c are not close to each other. However, in the case where the front intake port 11a and the front exhaust port 11c are close to each other in the axial direction as in this embodiment, the front intake port 11a and the front exhaust port 11c are paired. It is also possible to extend the front partition wall 11e from the frame 11 so that warm air exhausted from the front exhaust port 11c is not sucked again through the front intake port 11a. The same applies to the rear intake port 11b and the rear exhaust port 11d. A rear partition wall 11f extends from the frame 11 between the rear intake port 11b and the rear exhaust port 11d that form a pair. be able to.

  The motor M includes a motor drive unit 25 including a stator 19 fixed to the inner surface of the housing 10 (frame 11) and a rotor 22 fixed to the rotary shaft 14 inside the stator 19. . The motor M rotates the rotating shaft 14 via the rotor 22 by receiving power supplied to the stator 19.

  The stator 19 includes an annular stator core 20 and a stator coil 21 wound around the stator core 20. In the stator core 20, the coil end 21 a of the stator coil 21 is formed from a front end face 20 a (one end face) facing the first end bracket 12 and a rear end face 20 b (other end face) facing the second end bracket 13. It protrudes in an annular shape. The front exhaust port 11 c formed on the front end side of the frame 11 is formed at a position facing the outer peripheral surface of the coil end 21 a protruding from the front end surface 20 a of the stator core 20. The rear exhaust port 11 d formed on the rear end side of the frame 11 is formed at a position facing the outer peripheral surface of the coil end 21 a protruding from the rear end surface 20 b of the stator core 20.

  In the rotor 22, a plurality of cooling blades 23 are connected to the rotating shaft 14 from a front end face 22 a (one end face) facing the first end bracket 12 and a rear end face 22 b (other end face) facing the second end bracket 13. Are provided so as to protrude in the axial direction. The plurality of cooling blades 23 are provided at equal intervals along the circumferential direction of the rotor 22. Further, each cooling blade 23 has a predetermined inclination so that air is sucked into the region R surrounded by the inner peripheral surfaces of the plurality of cooling blades 23 by the rotation of the cooling blade 23 accompanying the rotation of the rotor 22. Is formed. In the present embodiment, the cooling blades 23 form air blowing means for sending air from the front intake port 11a and the rear intake port 11b toward the motor drive unit 25.

  Further, on the inner peripheral surface of the frame 11, a metal plate is formed in an annular shape between the front intake port 11 a and the front exhaust port 11 c and between the rear intake port 11 b and the rear exhaust port 11 d. The air guide 26 is joined. Each air guide 26 is disposed so as to cover both front and rear end faces of the motor drive unit 25, and the rotation shaft 14 is inserted through the center of each air guide 26. Each air guide 26 includes a base portion 26a extending in a flat plate shape from the inner peripheral surface of the frame 11 in the radial direction of the frame 11, and a front end surface 22a and a rear end surface 22b of the rotor 22 from the base portion 26a toward the rotating shaft 14. The guide part 26b which inclines so that it may face. The guide portion 26 b is inclined from a position beyond the cooling blade 23 toward the rotating shaft 14 in the radial direction of the frame 11.

  In addition, a gap that allows air flow is formed between the inner surface of the air guide 26 on the motor drive unit 25 side and the front end surface of each cooling blade 23 and the front end surface of the coil end 21a facing the inner surface. ing. An intake passage 33 is formed between the inner surface of the first end bracket 12 and the outer surface of the air guide 26 facing the inner surface, extending from the front intake port 11a toward the region R inside the cooling blade 23. ing. Further, an intake passage 33 extending from the rear intake port 11b toward the inner region R of the cooling blade 23 is formed between the inner surface of the second end bracket 13 and the outer surface of the air guide 26 facing the inner surface. Has been. Each of the intake passages 33 extends straight from the front intake port 11a and the rear intake port 11b along the radial direction of the frame 11, and is then bent toward the region R by the guide portion 26b.

  In the motor M configured as described above, a rotation sensor gear 30 is provided between the inner surface of the first end bracket 12 and the outer surface of the air guide 26. The rotation sensor gear 30 is made of a magnetic material, and is fixed to the front end side (one end side) of the rotation shaft 14 so as to be integrally rotatable with the rotation shaft 14. As shown in FIG. 2, the rotation sensor gear 30 has a large number of teeth 30a arranged along the circumferential direction of the rotating shaft 14, and a gap is formed between adjacent teeth 30a. The rotation sensor gear 30 is disposed so as to face the guide portion 26b of the front air guide 26. Here, the front intake port 11 a is formed in the frame 11 at a position on the outer peripheral side of the outer peripheral surface of the rotation sensor gear 30.

  A rotation sensor 31 is provided on the front end side of the frame 11 at a position facing the teeth 30 a of the rotation sensor gear 30. The rotation sensor 31 includes a Hall element (not shown), and the magnetic flux density passing through the Hall element changes every time the teeth 30a and the gap in the rotating rotation sensor gear 30 alternately pass, and the change is detected by a pulse signal. As an output, the rotational speed of the rotary shaft 14 is detected.

  As shown in FIGS. 1 and 2, a cylindrical rectifying cover 32 is formed on the inner surface of the first end bracket 12 on the entire outer peripheral surface (teeth) of the rotation sensor gear 30 excluding a portion facing the rotation sensor 31. The outer surface of 30a is fixed. The rectifying cover 32 is erected from the inner surface of the first end bracket 12 so that the central axis L1 is positioned on the same axis as the central axis L2 of the rotating shaft 14. A slight clearance is formed between the inner peripheral surface of the rectifying cover 32 and the outer peripheral surface of the rotation sensor gear 30 so as to extend with a constant width in the circumferential direction of the rectifying cover 32.

  As shown in FIG. 1, the standing height of the rectifying cover 32 from the inner surface of the first end bracket 12 is set so as not to exceed the end surface of the rotation sensor gear 30 on the motor drive unit 25 side. The rectifying cover 32 extends toward the intake passage 33 extending from the front intake port 11 a to the region R inside the cooling blade 23, and the intake passage extends so as to intersect the air flow in the intake passage 33. 33 is extended. That is, the rectifying cover 32 is interposed between the outer peripheral surface of the rotation sensor gear 30 and the front intake port 11a. Therefore, the intake passage 33 is narrowed by the rectifying cover 32 immediately before flowing into the guide portion 26 b of the air guide 26.

  In the motor M configured as described above, the rotating shaft 14 rotates with the rotation of the rotor 22. The rotation speed of the rotation shaft 14 in the motor M is determined by detecting the rotation of the rotation sensor gear 30 with the rotation sensor 31.

  On the other hand, due to the rotation of the cooling blade 23 accompanying the rotation of the rotor 22, the air in the region R flows through the gap between the air guide 26, the cooling blade 23, and the coil end 21a, and the front exhaust port 11c and the rear exhaust. When discharged from the opening 11d to the outside of the housing 10, the inside of the region R becomes negative pressure. Then, air is sucked into the housing 10 from the front intake port 11a and the rear intake port 11b and flows through the intake passage 33 toward the region R.

  At this time, the numerous teeth 30a of the rotating rotation sensor gear 30 act like a fan. Around the rotation sensor gear 30, the flow of air from the outer peripheral surface of the rotation sensor gear 30 to the outside, the motor drive unit 25 (region R) ) Is generated. At this time, a rectifying cover 32 is interposed between the outer peripheral surface of the rotation sensor gear 30 and the front intake port 11a, and the flow of air from the outer peripheral surface of the rotation sensor gear 30 to the outer peripheral side, that is, the front intake port 11a is It is stopped by the rectifying cover 32. For this reason, the air flow generated by the rotation of the rotation sensor gear 30 is prevented from disturbing the air flow in the intake passage 33 from the front intake port 11a toward the motor drive unit 25.

  Therefore, the air flowing through the intake passage 33 from the front intake port 11a toward the motor drive unit 25 is rectified and guided to flow into the region R by the guide portion 26b of the air guide 26. The air guided by the guide portion 26b and colliding with the rotary shaft 14 flows toward the region R and is discharged out of the frame 11 from the front exhaust port 11c and the rear exhaust port 11d as described above. Then, the air sucked into the housing 10 from the outside of the housing 10 and sent toward the motor drive unit 25 is the front end surface 22a and the rear end surface 22b of the rotor 22 in the motor drive unit 25 and the front end surface of the stator core 20. It flows along 20a, the rear end face 20b, and the coil end 21a. As a result, the front end surface 22a and the rear end surface 22b of the rotor 22 in the motor drive unit 25, the front end surface 20a and the rear end surface 20b of the stator core 20, and the coil end 21a are cooled by the air flowing inside and outside the housing 10.

According to the above embodiment, the following effects can be obtained.
(1) The rotation sensor gear 30 is accommodated in the housing 10 of the motor M, and a cylindrical rectifying cover 32 is provided on the outer peripheral side from the outer peripheral surface of the rotation sensor gear 30. Then, the flow of air from the outer peripheral surface of the rotation sensor gear 30 toward the front intake port 11a is stopped by the rectifying cover 32. Therefore, the air flow from the front intake port 11a toward the motor drive unit 25 is not disturbed by the air flow generated by the rotation of the rotation sensor gear 30, and is further prevented from returning toward the front intake port 11a. Then, the air flows into the intake passage 33 as rectification. Therefore, the air sucked from the front intake port 11a can be reliably flowed toward the motor drive unit 25, and the motor drive unit 25 can be efficiently cooled.

  (2) The rectifying cover 32 covers the entire outer peripheral surface of the rotation sensor gear 30 excluding a portion facing the rotation sensor 31. Therefore, at any position around the rotation sensor gear 30, it is possible to prevent the flow of air flowing to the motor drive unit 25 from being disturbed by the flow of air generated by the rotation of the rotation sensor gear 30.

  (3) The rectifying cover 32 covers the entire outer peripheral surface of the rotation sensor gear 30 excluding a portion facing the rotation sensor 31. For this reason, the rotation sensor gear 30 can be protected from the surroundings by the rectifying cover 32.

  (4) The rectifying cover 32 covers the entire outer peripheral surface of the rotation sensor gear 30 excluding a portion facing the rotation sensor 31. For this reason, even if dust or the like enters the housing 10 together with the air sucked from the front intake port 11a, it is possible to prevent the dust from entering the rotation sensor gear 30 by the rectifying cover 32. Therefore, it can be prevented that dust or the like collides with the rotating rotation sensor gear 30 and the teeth 30a are bent, and the rotation speed of the rotating shaft 14 cannot be accurately detected.

  (5) The front intake port 11a and the front exhaust port 11c, and the rear intake port 11b and the rear exhaust port 11d are formed at positions shifted along the axial direction of the rotary shaft 14 in the frame 11 and close to each other. ing. For this reason, the air sucked from the intake ports 11a and 11b can be quickly discharged out of the housing 10 from the exhaust ports 11c and 11d after the motor drive unit 25 is cooled.

  (6) In the housing 10, air guides 26 are provided between the front intake port 11a and the front exhaust port 11c and between the rear intake port 11b and the rear exhaust port 11d, respectively. The air guide 26 can guide the air sucked into the housing 10 from the air intake ports 11 a and 11 b so as to flow toward the motor drive unit 25, and the low temperature immediately after being sucked into the housing 10. The motor drive unit 25 can be efficiently cooled by air.

  (7) In the frame 11, a front partition wall 11e is erected between the front intake port 11a and the front exhaust port 11c, and between the rear intake port 11b and the rear exhaust port 11d, A partition wall 11f is erected. For this reason, the partition walls 11e and 11f indicate that the heated air discharged from the exhaust ports 11c and 11d and cooled after the motor drive unit 25 is cooled is sucked into the housing 10 from the intake ports 11a and 11b. Can be prevented.

(Second Embodiment)
A second embodiment in which the motor of the present invention is embodied as a motor mounted as a drive source for an industrial vehicle will be described with reference to FIG. In the following description, for the “front” and “rear” of the motor, the direction of the arrow Y2 shown in FIG. In the second embodiment described below, the overlapping description of the same configuration as that of the first embodiment already described is omitted or simplified.

  As shown in FIG. 3, an annular groove 12 a has a bearing 15 on the inner surface of the first end bracket 12 located on the front end side (one end side) of the rotating shaft 14 of the first end bracket 12 and the second end bracket 13. It is recessed so as to surround it. The annular groove 12a is formed such that the inner peripheral end of the annular groove 12a is positioned closer to (inner side) the rotation shaft 14 than the inner surface of the teeth 30a of the rotation sensor gear 30. A rectifying cover 40 is attached to the inner surface of the first end bracket 12. The rectifying cover 40 includes an annular flange portion 41 and a cylindrical wall portion 42 erected from the flange portion 41. The outer peripheral end of the annular groove 12 a is formed so as to be located outside the outer surface of the wall portion 42. The rectifying cover 40 is fixed to the inner surface of the annular groove 12a so as to cover almost the whole of the annular groove 12a so that only a part of the annular groove 12a is opened into the housing 10 by the flange portion 41.

  The flange portion 41 is formed with a communication hole 41a that allows communication between the intake passage 33 (front intake port 11a) and the inside of the annular groove 12a. Further, in the state where the annular groove 12 a is covered by the flange portion 41, the inner peripheral end side of the annular groove 12 a opens toward the inner region N surrounded by the numerous teeth 30 a of the rotation sensor gear 30. Therefore, the front intake port 11a and the internal region N of the rotation sensor gear 30 communicate with each other through the communication hole 41a and the annular groove 12a. The communication hole 41a and the annular groove 12a are connected to the front intake port 11a and the internal region N. A communication passage 43 that communicates with each other is formed. Therefore, the first end bracket 12 located on the front end side (one end side) of the rotating shaft 14 is formed with a communication passage 43 (the communication hole 41a and the annular groove 12a) that allows the front intake port 11a to communicate with the internal region N. ing.

  Then, according to the second embodiment, air is sucked into the housing 10 from the front intake port 11a by the rotation of the cooling blade 23 accompanying the rotation of the rotor 22 as in the first embodiment. At this time, due to the rotation of the rotation sensor gear 30, the internal region N of the plurality of teeth 30a becomes negative pressure, and the air flowing through the intake passage 33 passes through the communication hole 41a and the annular groove 12a (passes through the communication passage 43). It is fed to the rotation sensor gear 30 side. The air sent to the rotation sensor gear 30 side is sent toward the region R by the rotation of the rotation sensor gear 30.

  And the air which flowed toward the area | region R cools the motor drive part 25, and is discharged | emitted out of the flame | frame 11 from the front side exhaust port 11c. Also at this time, a large number of teeth 30a of the rotating rotation sensor gear 30 act like a fan, and the flow of air flowing around the rotation sensor gear 30 toward the front intake port 11a and the motor drive unit 25 (region R). appear. At this time, the rectifying cover 40 is interposed between the outer peripheral surface of the rotation sensor gear 30 and the front intake port 11 a, and the air flow from the rotation sensor gear 30 toward the front intake port 11 a is caused by the wall portion of the rectification cover 40. 42 is obstructed. For this reason, the air flow generated by the rotation of the rotation sensor gear 30 is prevented from disturbing the air flow in the intake passage 33 from the front intake port 11a toward the motor drive unit 25.

Therefore, according to the second embodiment, in addition to the same effects as those described in (1) to (7) of the first embodiment, the following effects can be obtained.
(8) The annular groove 12a is recessed in the inner surface of the first end bracket 12, and the communication hole 41a is formed in the rectifying cover 40 fixed to the first end bracket 12 so as to cover almost the entire annular groove 12a. The front intake port 11a and the inner region N of the rotation sensor gear 30 are communicated with each other through the communication hole 41a and the annular groove 12a. Therefore, the rotation of the rotation sensor gear 30 allows the air sucked into the housing 10 from the front intake port 11a to be sent to the rotation sensor gear 30 side and sent out toward the motor drive unit 25 as it is. Therefore, the cooling blade 23 and the rotation sensor gear 30 allow air to flow toward the motor drive unit 25, and the motor drive unit 25 can be cooled more efficiently.

In addition, you may change this embodiment as follows.
The rectifying covers 32 and 40 may be partially cut away in the circumferential direction.
The position and number of the front intake port 11a, the rear intake port 11b, the front exhaust port 11c, and the rear exhaust port 11d may be arbitrarily changed.

  O At least one of the front intake port 11a and the rear intake port 11b may be provided at a position of the first end bracket 12 or the second end bracket 13 at a position on the outer peripheral side of the outer peripheral surface of the rotation sensor gear 30.

  In the second embodiment, an annular groove 12a is formed on the inner surface of the first end bracket 12, and the front intake port 11a and the inner region N of the rotation sensor gear 30 are communicated with each other by the annular groove 12a. The groove that communicates the front intake port 11a and the inner region N of the rotation sensor gear 30 may be formed in a narrow groove shape.

In each embodiment, the present invention is embodied in the motor M mounted on an industrial vehicle. However, the present invention may be applied to a motor M mounted on an electric vehicle other than the industrial vehicle.
In each embodiment, a fan may be separately provided on the rotating shaft 14 as a blowing means.

Next, the technical idea that can be grasped from the above embodiment and other examples will be described below.
(1) The exhaust port is formed close to a position shifted from the intake port toward the center side along the axial direction of the rotation shaft in the housing. The motor according to item.

  (2) In the housing, an air guide is provided between the intake port and the exhaust port to guide the air sucked into the internal space from the intake port so as to flow toward the motor drive unit. The motor described in the technical idea (1).

  (3) The motor according to the technical idea (1) or (2), wherein a partition wall is provided between the intake port and the exhaust port in the housing.

Sectional drawing which shows the motor of 1st Embodiment. FIG. 2 is a sectional view taken along line 2-2 of FIG. 1 showing a rotation sensor gear and a rectifying cover. Sectional drawing which shows the motor of 2nd Embodiment.

Explanation of symbols

  M: Motor, N: Internal region, 10: Housing, 11a: Front intake port as intake port, 11c: Front exhaust port as exhaust port, 12: First end bracket, 13: Second end bracket, 14: Rotation Shaft, 19 ... Stator, 22 ... Rotor, 23 ... Cooling vane as blowing means, 25 ... Motor drive unit, 30 ... Rotation sensor gear, 30a ... Teeth, 31 ... Rotation sensor, 32, 40 ... Rectification cover, 43 ... Communication passage.

Claims (3)

A rotating shaft that has a motor driving portion including a stator fixed to the inner peripheral surface of the housing and a rotor that rotates inside the stator, and that rotates integrally with the rotor on a pair of end brackets in the housing The rotation sensor gear is rotatably supported, and a rotation sensor gear in which a large number of teeth are arranged in the circumferential direction of the rotation shaft is attached to one end side of the rotation shaft so as to be integrally rotatable, and the rotation speed of the rotation sensor gear Is a motor provided with a rotation sensor that detects the number of rotations of the rotating shaft,
An intake port for sucking air into the housing is formed at a position on the outer peripheral side of the outer peripheral surface of the rotation sensor gear in the housing, and an exhaust port for discharging the sucked air is formed in the housing, Furthermore, it has a blowing means for sending air from the intake port toward the motor drive unit,
A motor provided with a rectifying cover that covers the rotation sensor gear so as not to disturb the flow of air from the intake port toward the motor drive unit on the outer peripheral side of the outer peripheral surface of the rotation sensor gear.   The motor according to claim 1, wherein the rectifying cover is provided so as to cover the entire outer peripheral surface excluding a portion of the rotation sensor gear that faces the rotation sensor.   The end bracket located on one end side of the rotation shaft of the pair of end brackets is formed with a communication passage that connects the intake port and an internal region surrounded by a large number of teeth in the rotation sensor gear, 3. The motor according to claim 1, wherein air is sent into the internal region through the communication path by rotation of the rotation sensor gear, and further, air is sent from the rotation sensor gear toward the motor drive unit.

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