JP4895704B2 - Electric power steering motor and resolver device - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide an electric power steering motor capable of facilitating the adjustment of a peripheral position of a resolver device even using a waterproof structure. <P>SOLUTION: A seal member 241 capable of making the resolver device 200 watertight by sealing a housing of the motor 100 is compressed by insertion from the axial direction of the motor 100 by a member constituting the housing of the motor 100. <P>COPYRIGHT: (C)2008,JPO&amp;INPIT

Description

  The present invention relates to an electric power steering motor and a resolver device used as a rotational position sensor thereof, and typically relates to a technique for easily adjusting a circumferential position of a resolver device assembled to a motor.

  As a background art relating to the adjustment of the circumferential position of the resolver device, for example, one disclosed in Patent Document 1 is known. In Patent Document 1, a resolver stator is fitted and fixed to a motor housing via a spring member that can be elastically deformed in a radial direction, and an adjustment portion for moving the resolver stator in the circumferential direction is provided on the spring member. A technique for adjusting the circumferential position of the resolver stator relative to the core is disclosed.

JP 2003-158856 A

  With the technique disclosed in Patent Document 1, the position in the circumferential direction can be adjusted by moving the resolver stator in the circumferential direction while being fitted in the motor housing. However, in the technique disclosed in Patent Document 1, it is necessary to separately prepare a spring member integrated with the resolver stator and engage with the motor housing. Therefore, the structure becomes complicated and the cost increases. In the technique disclosed in Patent Document 1, since the spring member is rotated by a jig inserted through an adjustment hole provided in the motor housing, a separate jig is required, which further increases the cost and makes the adjustment work complicated. become. Furthermore, the technique disclosed in Patent Document 1 does not consider application to a motor that requires a waterproof structure.

  The present invention provides an electric power steering motor that can easily adjust the circumferential position of a resolver device even with a waterproof structure.

  Here, the feature of the present invention is that the sealing member for sealing the motor casing to waterproof the resolver device is sandwiched and compressed from the axial direction of the motor by the members constituting the motor casing. It is to have done.

  According to the present invention, since the axial seal structure can be realized by the above configuration, the circumferential position of the resolver device can be adjusted when the seal member is not compressed when the circumferential position of the resolver device is adjusted. Therefore, according to the present invention, the circumferential position of the resolver device can be easily adjusted even with a waterproof structure.

  The present invention also provides a resolver device suitable for the assembly work of the electric power steering motor.

  According to the present invention, since the circumferential position of the resolver device can be easily adjusted even with a waterproof structure, the resolver device can be assembled to the motor with the same workability as that of the non-waterproof structure.

  Further, according to the present invention, since the circumferential position of the resolver device can be adjusted in the non-compressed state of the seal member, excessive force does not act on the seal member when adjusting the circumferential position of the resolver device. It is possible to prevent a decrease in sealing performance due to damage of the sealing member.

  Further, according to the present invention, it is possible to provide a resolver device suitable for assembling work of a waterproof structure electric power steering motor.

  Embodiments of the present invention will be described with reference to the drawings.

  First, the configuration of an electric power steering apparatus to which the motor 100 of this embodiment is applied will be described with reference to FIG.

  In the present embodiment, a rack type electric power steering apparatus in which a motor 100 is mounted in the vicinity of a rack and pinion gear will be described as an example. When the motor 100 is disposed outside the passenger compartment as in the rack type electric power steering device, the motor 100 needs to be waterproof.

  The electric power steering device adds a motor driving device to the steering device, and the rotational driving force transmitted from the steering ST operated by the driver to the manual steering gear STG is supplemented by the rotational driving force of the motor 100, so that the driver for the steering ST is driven. The operation amount is reduced (assist). When the steering ST is rotated and the motor 100 is driven by the rotation operation of the driver, the rotational driving force output from the steering ST and the motor 100 is transmitted to the manual steering gear STG via the rod RO and decelerated. The reduced rotational driving force is transmitted to the left and right tie rods TR1 and TR2, and is transmitted to the left and right wheels WH1 and WH2. Thereby, the left and right wheels WH1, WH2 are steered.

  The motor drive device includes a motor 100 that generates a rotational driving force for steering, and an inverter device (motor control device) INV that controls the drive of the motor 100. The motor 100 uses a battery BA as a driving power supply, is attached in the vicinity of the manual steering gear STG, and its output shaft is mechanically connected to the manual steering gear STG via the gear GE. The inverter device INV converts the DC power supplied from the battery BA into three-phase AC power and supplies it to the motor 100 to control the driving of the motor 100. Thereby, the motor 100 supplies the rotational driving force for steering to the manual steering gear STG via the gear GE.

  The gear GE is configured by a speed reduction mechanism using a worm and a wheel or a planetary gear, a torque transmission mechanism using a hydraulic mechanism, or the like. A torque sensor TS for detecting a rotational driving force (torque) applied to the steering wheel ST is attached to the rod RO. The output signal of the torque sensor TS is output to the inverter device INV in order to control the torque output from the motor 100.

  Next, the configuration of the motor 100 of this embodiment and the configuration of the resolver device 200 mounted with the motor 100 of this embodiment as a sensor for detecting the rotational position of the motor will be described with reference to FIGS. To do.

  First, the configuration of the motor 100 of this embodiment will be described.

  The motor 100 generates steering torque by rotating a plurality of rotating magnetic poles by the magnetic action of a plurality of fixed magnetic poles and a plurality of rotating magnetic poles. A motor main body composed of the rotor 20 constituting the rotating magnetic pole and a resolver device 200 for detecting the position of the rotating magnetic pole of the rotor 20 are juxtaposed in the axial direction and housed in the housing. The rotor 20 is opposed to the inner peripheral side of the stator 10 via a gap and is rotatably supported. In this embodiment, a three-phase AC type surface magnet type synchronous motor is used as the motor 100.

  The housing is composed of a cylindrical frame 1 and a plurality of brackets provided at both axial ends of the frame 1. A first bracket (front end bracket) 2 is fixed to the end of the frame 1 on one side (front side) in the axial direction by a bolt, and closes the opening at one end of the frame 1 in the axial direction. The first bracket 2 is an annular one having a flange portion that protrudes radially outward from the outer diameter of the frame 1. Second to fourth brackets 3 to 5 juxtaposed in the axial direction are provided at the other end (rear side) end of the frame 1 in the axial direction, and block the other end of the frame 1 in the axial direction. The second bracket (rear end bracket) 3 is provided on the most motor body side, and is an annular one fitted to the inner peripheral surface of the other end portion in the axial direction of the frame 1. The third bracket (resolver holder) 4 is provided on the side opposite to the motor body side of the second bracket 3 and is fitted to the other end portion in the axial direction of the frame 1 by a plurality of concave and convex engaging portions 4c. The cylindrical motor has a convex shape on the axial motor body side. The fourth bracket (rear holder) 5 is provided on the side opposite to the motor body side of the third bracket 4 (most side opposite to the motor body side), and is fixed to the third bracket 4 with bolts. It is a disk-shaped one that covers the opposite side of the 3 bracket 4 to the motor body side. These members are made of metal such as aluminum.

  A bearing 6 is provided at the hollow portion of the first bracket 2, and a bearing 7 is provided at the motor main body side end portion (small diameter side) of the hollow portion 4 a of the third bracket 4. The bearings 6 and 7 support the rotary shaft 21 so as to be rotatable. A resolver device 200 is provided at the end (large diameter side) opposite to the motor main body side of the hollow portion 4 a of the third bracket 4. The cylindrical portion of the third bracket 4 is fitted in the hollow portion of the second bracket 3. The small diameter side of the cylindrical portion of the third bracket 4 protrudes closer to the motor body than the second bracket 3.

  A seal member 30 is provided between the frame 1 and the first bracket 2. The seal member 30 is an O-ring provided in an annular shape, and is sandwiched and compressed by the frame 1 and the first bracket 2 from the axial direction and the radial direction. Thereby, between the flame | frame 1 and the 1st bracket 2 can be sealed, and the front side can be waterproofed.

  On the other hand, on the rear side, a seal member 31 provided between the frame 1 and the second bracket 3, a seal member 32 provided between the second bracket 3 and the third bracket 4, and the third bracket 4. And the fourth bracket 5 are sealed between the respective members by a seal member 241 provided for waterproofing.

  The seal member 31 is provided in an annular shape along a base 31a provided in an annular shape and along the base 31a. The seal member 31 protrudes from the surface of the base 31a in both directions in the radial direction (the clamping direction between the frame 1 and the second bracket 3) And it is comprised from the lip | rip parts 31b and 31c which compress by being pinched | interposed by the 2nd bracket 3. FIG. The lip portions 31b and 31c are arranged side by side in the axial direction (the direction along the clamping surface of the seal member 31 in the frame 1 and the second bracket 3).

  Here, the lip portion 31b (motor body side) has a role of stopping the flow of the mold resin to the second bracket 3 side when the motor body (stator) is molded with the mold resin. On the other hand, the lip portion 31c (the side opposite to the motor main body side) has a role of stopping water from entering the motor main body through the gap of the housing. As described above, according to this embodiment, two different seals can be realized with one seal member, which is economical. Moreover, since it is a double structure with respect to the seal of one direction, a sealing performance can be improved.

  The seal member 32 is also the same as the seal member 31, and is provided in an annular shape along the base portion 32a and the base portion 32a. The seal member 32 is formed in a radial direction from the surface of the base portion 32a (the second bracket 3 and the third bracket 4 (Holding direction) It is composed of lip portions 32b and 32c that protrude in both directions and are compressed by being sandwiched between the second bracket 3 and the third bracket 4. The lip portions 32b and 32c are the same as the lip portions 31b and 31c, and are arranged in parallel in the axial direction (the direction along the holding surface of the seal member 32 in the second bracket 3 and the third bracket 4). Since the seal member 32 also employs a two-lip structure and has a double structure with respect to a one-way seal, the sealing performance against water immersion can be improved.

  The detailed configuration of the seal member 241 will be described later.

  The stator 10 includes a stator core 11 and a stator coil 12 attached to the stator core 11, and is fitted to the inner peripheral surface of the frame 1. The stator core 11 is a magnetic body (magnetic path forming body) formed by laminating a plurality of silicon steel plates in the axial direction, and protrudes radially inward from an annular back core and an inner peripheral portion of the back core. It consists of a plurality of teeth arranged at equal intervals in the direction. A split core method is used to manufacture the stator core 11. The split core method includes a method in which the stator core 11 is divided into a back core and a tooth, and a method in which the back core is divided into teeth. In the present embodiment, the latter is adopted.

  A winding conductor constituting the stator coil 12 is intensively wound around each of the plurality of teeth. The plurality of winding conductors are electrically connected for each phase by a connecting member juxtaposed at the axial end of one coil end portion (on the second bracket 3 side) of the stator coil 12, and further, a three-phase winding. As electrically connected. Three-phase winding connection methods include a Δ (delta) connection method and a Y (star) connection method. In the present embodiment, the former having a smaller number of connections is adopted.

  In the stator 10, the stator core 11 with the stator coil 12 mounted is press-fitted to the inner peripheral side of the frame 1, the stator coil 12 is connected, and the other axial end of the frame 1 is closed by the second bracket 3. In this state, the stator core 11, the stator coil 12, and the connection member are integrally molded with a thermosetting resin. Cutting is applied to the inner peripheral surface of the molded stator 10, that is, the inner peripheral surface of the stay core 11. Thereby, the variation in the gap between the stator 10 and the rotor 20 is reduced, and the inner diameter roundness of the stator 10 is improved.

  The rotor 20 includes a rotor core fixed on the outer peripheral surface of the rotating shaft 21, a plurality of magnets fixed to the outer peripheral surface of the rotor core with an adhesive, and magnet covers 22a and 22b provided on the outer peripheral side of the magnet. ing. The magnet cover 22 is for preventing scattering of the magnet from the rotor core, and is a cylindrical member or a tubular member made of a non-magnetic material such as stainless steel (common name SUS), and is divided into two in the axial direction. Configured.

  Reference numeral 8 in the figure denotes a three-phase harness for supplying AC power supplied from the inverter device INV to the motor 100. Reference numeral 9 denotes a connector portion that electrically connects the connecting member of the stator coil 12 and the harness 8.

  Next, the structure of the resolver apparatus 200 of a present Example is demonstrated.

  As shown in FIG. 4, the rotating shaft 21 extends further in the axial direction to the opposite side of the motor body than the bearing 7 and reaches the hollow portion 4 d of the third bracket 4. A resolver rotor 220 is mounted on the outer periphery of the rotating shaft 21 that reaches the hollow portion 4d, and is mechanically fixed by a nut 221 that is screwed to the tip of the rotating shaft 21. The resolver rotor 220 and the rotating shaft 21 are prevented from rotating about the resolver rotor 220. The resolver rotor 220 includes a plurality of rotating magnetic poles. The number of magnetic poles of the resolver rotor 220 is determined according to the number of pole pairs of the magnetic poles of the rotor 20.

  A cylindrical portion that outputs a signal for detecting the rotating magnetic pole position of the rotor 20 according to the resolver rotor 220 that rotates in synchronization with the rotating shaft 21 is formed on the stamping portion (large diameter side) of the hollow portion 4 d of the third bracket 4. A resolver stator 210 is fitted to the resolver rotor 220 so as to face the gap via a gap. The resolver stator 210 has an outer peripheral end surface pressed from the side opposite to the motor body side by a horseshoe-shaped holding plate 260 fixed to the third bracket 4 by screws, and is fixed to the third bracket 4 by this pressing.

  As shown in FIGS. 1 and 3, the resolver stator 210 includes a plurality of magnetic poles 211 protruding toward the center of the rotating shaft 21, a back core 213 that magnetically connects the plurality of magnetic poles 211, and a plurality of magnetic poles 211. Each of them is composed of coils 212 wound intensively via bobbins (insulating members).

  A plate-like terminal block 230 extending from the resolver stator 210 toward the radially outer side is coupled to a part of the outer periphery of the resolver stator 210. The terminal block 230 is resin-molded integrally with the resolver stator 210 and includes a plurality of metal pin-like terminals 231. The terminal 231 extends from the coil 212 along the back core 213 and extends to the terminal block 230, and a plurality of wires 231 for outputting a rotating magnetic pole position detection signal from the resolver stator 210 and the rotating magnetic pole position detection signal to the motor 100. This is a relay terminal for electrically connecting a plurality of lead wires 250 for output to the outside of the casing.

  As the resin for molding the terminal block 230, a thermoplastic resin such as polyamide, polyolefin, or reactive urethane that has a low injection pressure and can be used for insert molding and overmolding of electronic parts or the like is used. According to the present embodiment, since these resins are used, disconnection between the terminal 231 and the lead wire 250 can be prevented during resin molding. In addition, these resins have excellent adhesion to materials such as nylon, PBT, and ABS. Therefore, according to the present embodiment, the lead wire 250 can be firmly fixed.

  The lead wire 250 is connected to the terminal 231 in advance before molding the terminal block 230. The wiring 231 is guided to the terminal 231 after the terminal block 230 is formed, connected to the terminal 231 by soldering, etc., and then coated with varnish etc. together with the terminal 231 to be insulated from the surroundings and firmly fixed. .

  A grommet 240 is attached to the terminal block 230. This mounting is performed after the terminal block 230 is formed integrally with the resolver stator 210 and the resolver body is completed. The grommet 240 is attached between the third bracket 4 and the fourth bracket 5, closes an opening formed between the third bracket 4 and the fourth bracket 5, and connects the lead wire 250 to the third bracket 4. It is a rubber plug member provided with a plurality of through-holes 244 through which the lead wire 250 penetrates, and is led out from the inside of the housing between the first bracket 4 and the fourth bracket 5.

  A plurality of annular lips 244a projecting from the surface into the through passage are provided on the inner peripheral surfaces of the plurality of through holes 244. When the grommet 240 is sandwiched between the third bracket 4 and the fourth bracket 5, the lip 244 a is sandwiched and compressed by the inner peripheral surface of the through hole 244 and the outer peripheral surface of the lead wire 250 to seal the inside of the through hole 244. To do. Thereby, it is possible to prevent water from entering through the through hole 244.

  The grommet 240 is provided with an arc-shaped groove 243. When the grommet 240 is attached to the resolver body and the resolver body is attached to the third bracket 4, the groove 243 engages with the arcuate guide track protrusion 4a provided on the third bracket 4, and the guide track protrusion 4a. This is a rotation mechanism for rotating the grommet 240 in the circumferential direction with reference to. The arcs of the groove 243 and the guide track protrusion 4a have the rotation shaft 21 as a central axis. The guide track protrusion 4a is cut out at a part of the outer peripheral end surface of the third bracket 4 opposite to the motor main body (portion where the connector 9 is provided), and is one step lower than the other outer peripheral end surfaces. The outer peripheral end surface (surface having the same height as the installation surface of the holding plate 260) protrudes from the opposite side of the motor body, and is lower than the other outer peripheral end surfaces. Thereby, the rotation stop part 4b which contact | abuts the both ends of the rotation direction of the grommet 240 and stops rotation of the grommet 240 is formed in the circumferential direction both ends of the guide track protrusion 4a.

  The width of the grommet 240 in the rotational direction is smaller than the circumferential distance between the rotational restraining portions 4b (the circumferential length of the guide track protrusion 4a). For this reason, the rotatable range of the grommet 240 is determined by the circumferential distance between the rotation stopping portions 4b (the circumferential length of the guide track protrusion 4a) and the width of the grommet 240 in the rotational direction. In this embodiment, the rotation range of the grommet 240 is set to ± 6 ° (mechanical angle).

  At both ends in the rotational direction of the grommet 240, flanges 242 are provided for closing gaps formed between the both ends in the rotational direction of the grommet 240 and the rotation stop portion 4b. The collar part 242 The collar part 242 is provided so as to slide with respect to the outer peripheral surface of the third bracket 4 and the outer peripheral surface of the frame 1. According to this configuration, it is possible to close the gap for the adjustment allowance and prevent intrusion of water, foreign matter, and the like from the gap.

  As described above, in this embodiment, by rotating the grommet 240 attached to the resolver body, the offset of the detection angle of the resolver body can be easily adjusted without using a special device. In other words, the resolver stator 210 can be rotated by manually moving the grommet 240 in the left or right direction from the outside, and the phase difference between the induced voltage of the motor 100 and the voltage waveform output from the coil 212 is, for example, 0 ° ± 1. Can be adjusted in the range of °. This offset adjustment is performed while rotating the motor 100 and confirming the voltage waveform output from the coil 212 with an oscilloscope, for example.

  After the offset adjustment, the resolver stator 210 is fixed to the third bracket 4 by tightening the holding plate 260 with screws. Further, the fourth bracket 5 is fixed to the third bracket 4 with screws. Thereby, the assembly of the resolver device 200 is completed.

  Further, when inspection or adjustment becomes necessary, the fourth bracket 5 is removed from the third bracket 4 and the holding plate 260 is loosened so that the grommet 240 is rotated as in the above assembly. Angle adjustment can be easily performed.

  The configuration described above is like an electric power steering used under harsh conditions, and the adjustment angle is likely to go wrong due to mechanical vibrations, etc. Is particularly advantageous.

  In this embodiment, since the wiring 232 of the coil 212 is connected to the lead wire 250 via the terminal 231, even if a tensile stress is applied to the lead wire 250 from the outside, the stress is directly applied to the wiring 232. However, there is an advantage that the grommet 240 can be rotated with peace of mind.

  The grommet 240 is integrally formed with a seal member 241 for sealing between the fourth bracket 5 and the third bracket 4 and constituting a waterproof mechanism of the resolver body. The seal member 241 is positioned radially outward from the resolver body and radially inward from the groove 243, and further from the position of a screw for fixing the fourth bracket 5 to the third bracket 4. Is provided in an annular shape so as to be radially inward, and is provided in an annular shape along the base portion 241a and a flat plate-like base portion 241a provided in the annular shape, and both plate surfaces of the base portion 241a. It is comprised from the lip | rip part 241b which protrudes from.

  The seal member 241 is difficult to be sandwiched between the fourth bracket 5 and the third bracket 4 from the axial direction. For this reason, the plate | board surface of the base 241a has faced the axial direction (the clamping direction of the 4th bracket 5 and the 3rd bracket 4) both directions. The lip portion 241b protrudes in both axial directions (the clamping direction between the fourth bracket 5 and the third bracket 4) from the plate surface of the base portion 241a, and the fourth bracket 5 and the third bracket 4 extend from both axial directions. It compresses by being pinched.

  Thus, in this embodiment, since the sealing direction by the sealing member 241 between the fourth bracket 5 and the third bracket 4 is the axial direction, the offset of the resolver device 200 can be adjusted when the sealing member 241 is not compressed. . In addition, after the offset adjustment, the seal member 241 is sandwiched between the fourth bracket 5 and the third bracket 4 and the lip portion 241b is compressed, so that the gap between the fourth bracket 5 and the third bracket 4 can be sealed. Therefore, according to the present embodiment, even if the structure is waterproof, the offset adjustment of the resolver device 200 can be easily adjusted, and the resolver device 200 can be assembled to the motor 100 with the same workability as that of the non-waterproof structure.

  Further, according to the present embodiment, since the offset adjustment of the resolver device 200 can be performed with the seal member 241 in an uncompressed state, an excessive force does not act on the seal member 241 when the offset of the resolver device 200 is adjusted. It is possible to prevent a decrease in sealing performance due to damage of the member 241 or the like.

  Further, according to the present embodiment, since the seal member 241 and the grommet 240 are integrally formed, the assembly work of the motor 100 is easy.

  In this embodiment, the engagement structure between the guide track protrusion 4a and the groove 243 can prevent the grommet 240 from popping out when the internal pressure or the external pressure is applied.

  In this embodiment, the structure in which the guide track protrusion 4a and the groove 243 are engaged has been described. However, as shown in FIG. 2, the grommet 240 is provided with grooves 243 symmetrically. Therefore, the fourth bracket 5 may be provided with a protrusion that engages with the groove 243 so that the protrusion and the groove 243 are engaged when the resolver device 200 is assembled.

The top view which shows the whole structure of the resolver apparatus which is an Example of this invention. FIG. 2 is a longitudinal side view of FIG. 1. The top view which shows a structure when the resolver apparatus of FIG. 1 is integrated in a motor. FIG. 4 is a longitudinal side view of FIG. 3. Schematic structure of an electric power steering apparatus equipped with a motor according to an embodiment of the present invention.

Explanation of symbols

DESCRIPTION OF SYMBOLS 100 ... Motor, 200 ... Resolver apparatus, 240 ... Grommet, 241 ... Sealing member

Claims (17)

In an electric power steering motor that is mechanically connected to a steering device and outputs a steering force to the steering device,
A motor body that generates the steering force;
As a rotational position detection sensor of the motor body, a resolver device provided on the same shaft as the rotation shaft of the motor body;
A housing for housing the motor body and the resolver device;
It constitutes a waterproof mechanism of the resolver device, and has a seal member that seals between members constituting the housing,
The resolver device includes:
A resolver body that operates in synchronization with the rotation of the motor body and outputs a signal for detecting the rotational position of the motor body;
A grommet mounted on the resolver body and mounted on the housing;
The grommet closes the opening of the casing and leads out a lead wire for outputting the signal to the outside of the casing. The grommet is rotated using the casing as a guide. Equipped with a rotating mechanism to move,
The electric power steering motor is characterized in that the seal member is annularly provided on the outer side in the radial direction from the resolver body, and is sandwiched and compressed from the axial direction by members constituting the casing. The electric power steering motor according to claim 1,
The electric power steering motor, wherein the seal member is formed integrally with the grommet. The electric power steering motor according to claim 1,
The sealing member is
A base provided in an annular shape;
An electric power steering motor comprising: a ring portion provided along the base portion; and a lip portion projecting from a surface of the base portion in a direction facing a member constituting the housing. The electric power steering motor according to claim 1,
The electric power steering motor, wherein the seal member is provided in an annular shape radially inward of the rotation mechanism. The electric power steering motor according to claim 1,
The housing includes an arcuate guide track protrusion,
The electric power steering motor according to claim 1, wherein the rotation mechanism is an arcuate groove that engages with the guide track protrusion. The electric power steering motor according to claim 5,
At both ends in the circumferential direction of the guide track protrusion, there are provided rotation stopping portions that come into contact with ends in the rotation direction of the grommet and stop the rotation of the grommet,
The grommet is formed so that the width in the rotation direction is smaller than the distance between the rotation stop portions,
The electric power steering motor is characterized in that the pivotable range of the grommet is determined by the distance between the pivot stop portions and the width in the pivot direction of the grommet. The electric power steering motor according to claim 6,
At both ends in the rotational direction of the grommet, a collar is provided,
The electric power steering motor, wherein the flange portion closes a gap formed between both ends of the grommet in the rotation direction and the rotation stopping portion. The electric power steering motor according to claim 1,
The grommet is provided with a through hole for allowing the lead wire to penetrate from the inside of the housing to the outside, and an inner surface of the through hole is provided with an annular lip projecting from the surface into the through path. An electric power steering motor. In an electric power steering motor that is mechanically connected to a steering device and outputs a steering force to the steering device,
A frame constituting the housing;
A bracket that is attached to one end side of the frame in the axial direction and forms the casing together with the frame;
A seal member interposed between the frame and the bracket;
An iron core with a winding is provided, the iron core with the winding is housed inside the frame, and the bracket is packed with a mold resin in a state of being attached to the frame via the seal member. A stator,
A rotor disposed opposite to the stator and rotatably supported by the rotor;
The sealing member includes a base provided in an annular shape, and a plurality of lips provided in an annular shape along the base, projecting toward the frame and the bracket, and sandwiched and compressed by the frame and the bracket. Department and
The plurality of lip portions are juxtaposed along a holding surface of the seal member by the frame and the bracket,
The casing is configured as a sensor for detecting the rotational position of the motor body, and a resolver device provided on the same axis as the rotation shaft of the motor body and housed therein, and a waterproof mechanism of the resolver device. And a second seal member that seals between the members constituting the housing,
The resolver device operates in synchronization with the rotation of the motor body and outputs a signal for detecting the rotational position of the motor body, and the resolver body is attached to the resolver body and attached to the housing. With grommets,
The grommet closes the opening of the casing and leads out a lead wire for outputting the signal to the outside of the casing. The grommet is rotated using the casing as a guide. Equipped with a rotating mechanism to move,
The electric power steering motor is characterized in that the second seal member is annularly provided on the outer side in the radial direction than the resolver main body, and is sandwiched and compressed from the axial direction by a member constituting the casing. . The electric power steering motor according to claim 9 ,
The electric power steering motor, wherein the seal member is formed integrally with the grommet. It is housed inside the motor housing,
A resolver body that operates in synchronization with the rotation of the motor and outputs a signal for detecting the rotational position of the motor;
A grommet attached to the resolver body;
As a constituent of the waterproof mechanism of the resolver body, it has a seal member sandwiched between members constituting the housing of the motor,
The grommet is attached to the motor casing, closes the opening of the motor casing, and connects the lead wire for outputting the signal to the outside of the motor casing. It is led out to the outside and has a rotation mechanism for rotating with the motor casing as a guide,
The seal member is formed integrally with the grommet, and is annularly provided on the outer side in the radial direction than the resolver body. The seal member is sandwiched from the axial direction of the motor by a member constituting the motor casing and compressed. It is comprised so that it may be performed. The resolver apparatus characterized by the above-mentioned. In resolver apparatus according to claim 1 1,
The resolver body is
A rotor that rotates in synchronization with the rotation of the motor;
A stator that is mounted on a housing of a motor, includes a plurality of magnetic poles wound with a coil, and outputs the signal in accordance with the rotation of the rotor;
It is coupled to a part of the outer periphery of the stator, and is composed of a part including a terminal block having a terminal for electrically connecting the lead wire and the coil,
The resolver device, wherein the grommet is attached to the terminal block. In resolver apparatus according to claim 1 1,
The sealing member is
A base provided in an annular shape;
A resolver device comprising: a lip portion provided in a ring shape along the base portion, and protruding from a surface of the base portion in a direction facing a member constituting a housing of the motor. In resolver apparatus according to claim 1 1,
The resolver device, wherein the seal member is provided in an annular shape radially inward of the rotation mechanism. In resolver apparatus according to claim 1 1,
The resolver device, wherein the rotation mechanism is an arc-shaped groove for engaging with an arc-shaped guide track protrusion provided in a motor casing. In resolver apparatus according to claim 1 5,
The size in the rotational direction of the grommet is smaller than the length in the circumferential direction of the arcuate guide track protrusion provided in the motor casing,
At both ends of the rotation direction of the grommet, a gap formed between both ends of the rotation direction of the grommet and the casing of the motor is closed when the grommet is attached to the motor casing. The resolver apparatus characterized by the above-mentioned. The resolver device according to claim 1,
The grommet includes a through hole for allowing the lead wire to penetrate from the inside of the motor housing to the outside,
A resolver device, wherein an inner surface of the through hole is provided with an annular lip projecting from the surface into the through passage.

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