WO2016158978A1 - モータ、および電動パワーステアリング装置 - Google Patents
モータ、および電動パワーステアリング装置 Download PDFInfo
- Publication number
- WO2016158978A1 WO2016158978A1 PCT/JP2016/060181 JP2016060181W WO2016158978A1 WO 2016158978 A1 WO2016158978 A1 WO 2016158978A1 JP 2016060181 W JP2016060181 W JP 2016060181W WO 2016158978 A1 WO2016158978 A1 WO 2016158978A1
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- WO
- WIPO (PCT)
- Prior art keywords
- convex portion
- bus bar
- control board
- bearing
- motor
- Prior art date
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- H—ELECTRICITY
- H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
- H02K—DYNAMO-ELECTRIC MACHINES
- H02K11/00—Structural association of dynamo-electric machines with electric components or with devices for shielding, monitoring or protection
- H02K11/20—Structural association of dynamo-electric machines with electric components or with devices for shielding, monitoring or protection for measuring, monitoring, testing, protecting or switching
- H02K11/21—Devices for sensing speed or position, or actuated thereby
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B62—LAND VEHICLES FOR TRAVELLING OTHERWISE THAN ON RAILS
- B62D—MOTOR VEHICLES; TRAILERS
- B62D5/00—Power-assisted or power-driven steering
- B62D5/04—Power-assisted or power-driven steering electrical, e.g. using an electric servo-motor connected to, or forming part of, the steering gear
- B62D5/0403—Power-assisted or power-driven steering electrical, e.g. using an electric servo-motor connected to, or forming part of, the steering gear characterised by constructional features, e.g. common housing for motor and gear box
- B62D5/0406—Power-assisted or power-driven steering electrical, e.g. using an electric servo-motor connected to, or forming part of, the steering gear characterised by constructional features, e.g. common housing for motor and gear box including housing for electronic control unit
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B62—LAND VEHICLES FOR TRAVELLING OTHERWISE THAN ON RAILS
- B62D—MOTOR VEHICLES; TRAILERS
- B62D5/00—Power-assisted or power-driven steering
- B62D5/04—Power-assisted or power-driven steering electrical, e.g. using an electric servo-motor connected to, or forming part of, the steering gear
- B62D5/0403—Power-assisted or power-driven steering electrical, e.g. using an electric servo-motor connected to, or forming part of, the steering gear characterised by constructional features, e.g. common housing for motor and gear box
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B62—LAND VEHICLES FOR TRAVELLING OTHERWISE THAN ON RAILS
- B62D—MOTOR VEHICLES; TRAILERS
- B62D5/00—Power-assisted or power-driven steering
- B62D5/06—Power-assisted or power-driven steering fluid, i.e. using a pressurised fluid for most or all the force required for steering a vehicle
- B62D5/07—Supply of pressurised fluid for steering also supplying other consumers ; control thereof
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- H—ELECTRICITY
- H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
- H02K—DYNAMO-ELECTRIC MACHINES
- H02K1/00—Details of the magnetic circuit
- H02K1/06—Details of the magnetic circuit characterised by the shape, form or construction
- H02K1/22—Rotating parts of the magnetic circuit
- H02K1/27—Rotor cores with permanent magnets
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- H—ELECTRICITY
- H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
- H02K—DYNAMO-ELECTRIC MACHINES
- H02K11/00—Structural association of dynamo-electric machines with electric components or with devices for shielding, monitoring or protection
- H02K11/30—Structural association with control circuits or drive circuits
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- H—ELECTRICITY
- H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
- H02K—DYNAMO-ELECTRIC MACHINES
- H02K21/00—Synchronous motors having permanent magnets; Synchronous generators having permanent magnets
- H02K21/12—Synchronous motors having permanent magnets; Synchronous generators having permanent magnets with stationary armatures and rotating magnets
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- H—ELECTRICITY
- H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
- H02K—DYNAMO-ELECTRIC MACHINES
- H02K3/00—Details of windings
- H02K3/46—Fastening of windings on the stator or rotor structure
- H02K3/50—Fastening of winding heads, equalising connectors, or connections thereto
- H02K3/505—Fastening of winding heads, equalising connectors, or connections thereto for large machine windings, e.g. bar windings
-
- H—ELECTRICITY
- H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
- H02K—DYNAMO-ELECTRIC MACHINES
- H02K3/00—Details of windings
- H02K3/46—Fastening of windings on the stator or rotor structure
- H02K3/52—Fastening salient pole windings or connections thereto
- H02K3/521—Fastening salient pole windings or connections thereto applicable to stators only
- H02K3/522—Fastening salient pole windings or connections thereto applicable to stators only for generally annular cores with salient poles
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- H—ELECTRICITY
- H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
- H02K—DYNAMO-ELECTRIC MACHINES
- H02K5/00—Casings; Enclosures; Supports
- H02K5/04—Casings or enclosures characterised by the shape, form or construction thereof
- H02K5/10—Casings or enclosures characterised by the shape, form or construction thereof with arrangements for protection from ingress, e.g. water or fingers
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- H—ELECTRICITY
- H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
- H02K—DYNAMO-ELECTRIC MACHINES
- H02K5/00—Casings; Enclosures; Supports
- H02K5/04—Casings or enclosures characterised by the shape, form or construction thereof
- H02K5/22—Auxiliary parts of casings not covered by groups H02K5/06-H02K5/20, e.g. shaped to form connection boxes or terminal boxes
- H02K5/225—Terminal boxes or connection arrangements
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- H—ELECTRICITY
- H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
- H02K—DYNAMO-ELECTRIC MACHINES
- H02K11/00—Structural association of dynamo-electric machines with electric components or with devices for shielding, monitoring or protection
- H02K11/20—Structural association of dynamo-electric machines with electric components or with devices for shielding, monitoring or protection for measuring, monitoring, testing, protecting or switching
- H02K11/21—Devices for sensing speed or position, or actuated thereby
- H02K11/215—Magnetic effect devices, e.g. Hall-effect or magneto-resistive elements
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- H—ELECTRICITY
- H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
- H02K—DYNAMO-ELECTRIC MACHINES
- H02K2213/00—Specific aspects, not otherwise provided for and not covered by codes H02K2201/00 - H02K2211/00
- H02K2213/03—Machines characterised by numerical values, ranges, mathematical expressions or similar information
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- H—ELECTRICITY
- H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
- H02K—DYNAMO-ELECTRIC MACHINES
- H02K5/00—Casings; Enclosures; Supports
- H02K5/04—Casings or enclosures characterised by the shape, form or construction thereof
- H02K5/12—Casings or enclosures characterised by the shape, form or construction thereof specially adapted for operating in liquid or gas
- H02K5/124—Sealing of shafts
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- H—ELECTRICITY
- H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
- H02K—DYNAMO-ELECTRIC MACHINES
- H02K5/00—Casings; Enclosures; Supports
- H02K5/04—Casings or enclosures characterised by the shape, form or construction thereof
- H02K5/16—Means for supporting bearings, e.g. insulating supports or means for fitting bearings in the bearing-shields
- H02K5/173—Means for supporting bearings, e.g. insulating supports or means for fitting bearings in the bearing-shields using bearings with rolling contact, e.g. ball bearings
- H02K5/1732—Means for supporting bearings, e.g. insulating supports or means for fitting bearings in the bearing-shields using bearings with rolling contact, e.g. ball bearings radially supporting the rotary shaft at both ends of the rotor
Definitions
- the present invention relates to a motor and an electric power steering apparatus.
- Some electric motors have a circuit board disposed in a motor case (for example, Patent Document 1).
- an aspect of the present invention aims to provide a motor having a structure capable of suppressing contamination from adhering to a control board, and an electric power steering apparatus including such a motor. One of them.
- One aspect of the motor of the present invention includes a shaft having a central axis extending in the axial direction, a rotor core fixed to the shaft, a rotor having a rotor magnet fixed to the rotor core, and a radially outer side of the rotor.
- a stator that surrounds the stator, a bearing that is positioned on one side of the stator in the axial direction, supports the shaft, a cylindrical motor housing that holds the stator and opens on the one side, and the one side of the stator
- a bearing holder for holding the bearing, a control board located on the one side of the bearing holder, a rotation sensor attached to the control board, and a control board located on the one side of the motor housing.
- a control board housing for accommodating a board; and one side of the bearing relative to the bearing;
- a non-magnetic material that covers at least a portion of the sensor magnet attached to the shaft between the control board and the bearing holder and covers the shaft, the bearing, and the one side of the sensor magnet And a contamination cover.
- a motor having a structure that can suppress contamination from adhering to the control board, and an electric power steering apparatus including such a motor.
- FIG. 1 is a cross-sectional view showing the motor of this embodiment.
- FIG. 2 is a cross-sectional view showing a portion of the motor of this embodiment.
- FIG. 3 is a perspective view showing a portion of the motor of this embodiment.
- FIG. 4 is a perspective view showing a portion of the motor of this embodiment.
- FIG. 5 is a schematic diagram showing the electric power steering apparatus of the present embodiment.
- an XYZ coordinate system is appropriately shown as a three-dimensional orthogonal coordinate system.
- the Z-axis direction is a direction parallel to the axial direction of the central axis J shown in FIG.
- the X-axis direction is a direction orthogonal to the Z-axis direction and is the left-right direction in FIG.
- the Y-axis direction is a direction orthogonal to both the X-axis direction and the Z-axis direction.
- the positive side (+ Z side, one side) in the Z-axis direction is referred to as the “rear side”
- the negative side ( ⁇ Z side, the other side) in the Z-axis direction is referred to as the “front side”.
- the rear side and the front side are simply names used for explanation, and do not limit the actual positional relationship and direction.
- a direction parallel to the central axis J (Z-axis direction) is simply referred to as an “axial direction”
- a radial direction around the central axis J is simply referred to as a “radial direction”.
- the circumferential direction centering around, that is, the circumference of the central axis J is simply referred to as “circumferential direction”.
- FIG. 1 is a cross-sectional view showing a motor 1 of the present embodiment.
- FIG. 2 is a cross-sectional view showing a portion of the motor 1 of the present embodiment.
- 3 and 4 are perspective views showing a portion of the motor 1 of the present embodiment. 3 and 4, the housing 10 and the control board 60 are not shown.
- FIG. 3 shows a state before the contamination cover 50 is attached. *
- the motor 1 includes a housing 10, a rotor 20 having a shaft 21, a stator 30, a rear bearing 24, a front bearing 25, a sensor magnet 63, a bearing holder 40, and a bus bar unit 70.
- the housing 10 accommodates each part of the motor 1 therein.
- the housing 10 includes a motor housing 11 and a control board housing 12. That is, the motor 1 includes a motor housing 11 and a control board housing 12. *
- the motor housing 11 has a cylindrical shape and opens to the rear side (+ Z side).
- the motor housing 11 includes a motor cylindrical portion 14, a bottom portion 13, and a front bearing holding portion 18.
- the motor tubular portion 14 is tubular and surrounds the radially outer side of the stator 30.
- the motor cylindrical portion 14 is cylindrical.
- a stator 30 is fixed to the inner side surface of the motor cylindrical portion 14. That is, the motor housing 11 holds the stator 30.
- the bottom portion 13 is disposed at the front side ( ⁇ Z side) end portion of the motor cylindrical portion 14.
- An output shaft hole portion 13 a is disposed on the bottom portion 13.
- the output shaft hole 13a penetrates the bottom 13 in the axial direction (Z-axis direction).
- the front bearing holding portion 18 is disposed on the rear side (+ Z side) surface of the bottom portion 13.
- the front bearing holding unit 18 holds the front bearing 25. *
- the control board housing 12 is located on the rear side (+ Z side) of the motor housing 11.
- the control board housing 12 accommodates the control board 60.
- the control board housing 12 includes a control board cylindrical portion 15 and a lid portion 16. *
- the control board cylindrical portion 15 has a cylindrical shape and surrounds the outer side in the radial direction of the control board 60.
- the control board cylindrical portion 15 is cylindrical.
- the control board cylindrical portion 15 is connected to an end portion on the rear side (+ Z side) of the motor cylindrical portion 14.
- the bottom portion 13, the motor cylindrical portion 14, and the control board cylindrical portion 15 are a bottomed cylindrical single member that opens to the rear side.
- the bottom portion 13, the motor cylindrical portion 14, and the control board cylindrical portion 15 may be separate members. *
- the lid portion 16 closes the opening on the rear side (+ Z side) of the control board cylindrical portion 15.
- the lid portion 16 includes a lid body 16a, a support portion 16b, a wiring member 19, and a connector portion 17.
- the support portion 16b extends from the lid main body 16a to the front side ( ⁇ Z side).
- the support portion 16 b is located on the radially inner side of the control board cylindrical portion 15.
- the lid portion 16 and the control board cylindrical portion 15 may be a single member. That is, the housing 10 may be a single member.
- the wiring member 19 protrudes from the support portion 16b to the front side ( ⁇ Z side).
- the wiring member 19 is electrically connected to the control board 60.
- the wiring member 19 is routed to the connector portion 17 via the support portion 16b and the lid portion main body 16a.
- the connector part 17 extends from the lid part main body 16a to the rear side (+ Z side).
- An external power supply (not shown) is connected to the connector portion 17.
- the wiring member 19 is electrically connected to an external power source via the connector portion 17. Thereby, electric power can be supplied to the control board 60 from the external power supply via the wiring member 19. *
- the rotor 20 includes a shaft 21, a rotor core 22, and a rotor magnet 23.
- the shaft 21 is centered on a central axis J extending in the axial direction (Z-axis direction).
- the shaft 21 is supported by the front bearing 25 and the rear bearing 24 so as to be rotatable around the central axis J.
- the front side ( ⁇ Z side) end of the shaft 21 protrudes to the outside of the housing 10 through the output shaft hole 13a.
- a hole is provided in an end surface on the rear side (+ Z side) of the shaft 21.
- An attachment member 62 is fitted into the hole of the shaft 21.
- the attachment member 62 is a rod-shaped member and extends in the axial direction. *
- the shaft 21 is fixed to the rotor core 22.
- the rotor core 22 has a through hole penetrating in the axial direction.
- the shaft 21 passes through the through hole of the rotor core 22.
- the rotor core 22 surrounds the shaft 21 in the circumferential direction.
- the shaft 21 is preferably fixed to the through hole of the rotor core 22 by press-fitting.
- the rotor magnet 23 is fixed to the rotor core 22. More specifically, the rotor magnet 23 is fixed to the outer surface along the circumferential direction of the rotor core 22. The rotor core 22 and the rotor magnet 23 rotate together with the shaft 21. *
- the stator 30 has a substantially cylindrical shape centered on the central axis J.
- the stator 30 surrounds the outer side of the rotor 20 in the radial direction.
- the stator 30 includes a stator core 31, a bobbin 32, and a coil 33.
- the stator core 31 has a core back portion 31a and a plurality of teeth portions 31b. *
- the shape of the core back portion 31a is a cylindrical shape centered on the central axis J.
- Each tooth part 31b extends toward the shaft 21 from the inner side surface of the core back part 31a.
- the teeth portions 31b are arranged at equal intervals in the circumferential direction on the inner surface of the core back portion 31a.
- the bobbin 32 is attached to each tooth portion 31b. *
- the coil 33 When energized, the coil 33 can excite the stator core 31.
- the coil 33 is disposed on the bobbin 32. More specifically, the coil 33 is configured by winding a conductive wire around the bobbin 32.
- a coil wiring 34 is connected to the coil 33. At least a part of the coil wiring 34 is inserted into a hole 40a of a bearing holder 40 described later. An end 34 a on the rear side (+ Z side) of the coil wiring 34 is located on the rear side with respect to the bearing holder 40.
- the coil wiring 34 may be an end portion of a conductive wire constituting the coil 33, or may be a separate member from the conductive wire constituting the coil 33. *
- the rear bearing 24 is located on the rear side (+ Z side) of the stator 30.
- the rear bearing 24 is held by the bearing holder 40.
- the front bearing 25 is located on the front side ( ⁇ Z side) of the stator 30.
- the front bearing 25 is held by the front bearing holding portion 18 of the motor housing 11.
- the rear bearing 24 and the front bearing 25 support the shaft 21 of the rotor 20.
- the rear bearing 24 and the front bearing 25 are ball bearings.
- the types of the rear bearing 24 and the front bearing 25 are not particularly limited, and other types of bearings such as a sliding bearing may be used. *
- the sensor magnet 63 is arranged on the rear side (+ Z side) from the rear bearing 24.
- the sensor magnet 63 is disposed on the rear side with respect to the bearing holder 40.
- the sensor magnet 63 has an annular shape.
- the attachment member 62 is fixed to the shaft 21.
- the shaft 21 is fitted into the through hole of the mounting member 62.
- the inner surface of the sensor magnet 63 is fitted to the outer surface of the mounting member 62. Thereby, the sensor magnet 63 is attached to the shaft 21.
- the rotation sensor 61 detects a change in the magnetic pole position of the sensor magnet 63.
- a magnetoresistive element is used as the rotation sensor 61.
- the sensor magnet 63 is disposed on the rear side (+ Z side) of the shaft 21. Thereby, the resolution of the rotation sensor 61 can be improved. As a result, the response of the motor 1 can be improved.
- the bearing holder 40 is disposed on the rear side (+ Z side) of the stator 30.
- the bearing holder 40 is fixed to the inner surface of the control board cylindrical portion 15.
- the shape of the bearing holder 40 is preferably a circular shape centered on the central axis J.
- the bearing holder 40 is preferably made of metal.
- the shape of the bearing holder 40 is not necessarily limited to a circular shape, and may be another shape such as a polygon. *
- the bearing holder 40 includes a holding part 41 and an annular part 42.
- the holding portion 41 has a cylindrical shape with the central axis J as the center.
- the holding part 41 opens on both sides in the axial direction (Z-axis direction).
- the rear bearing 24 is fitted inside the holding portion 41 in the radial direction. Thereby, the bearing holder 40 can hold the rear bearing 24.
- the annular portion 42 surrounds the radially outer side of the holding portion 41.
- the holding portion 41 and the annular portion 42 are a single member.
- the annular portion 42 has a plurality of holes 40a that penetrate the annular portion 42 in the axial direction (Z-axis direction). That is, the bearing holder 40 is provided with at least one hole 40a that penetrates the bearing holder 40 in the axial direction.
- the bus bar unit 70 is disposed on the rear side (+ Z side) of the bearing holder 40.
- the bus bar unit 70 is disposed on the rear surface of the annular portion 42 of the bearing holder 40.
- the bus bar unit 70 includes a bus bar holder 71 and a bus bar 72. *
- the bus bar holder 71 holds the bus bar 72.
- the bus bar holder 71 is preferably made of resin. As shown in FIG. 3, the bus bar holder 71 has a main body portion 75, a first protrusion 76, and a second protrusion 77. *
- the main body 75 includes a rear-side main body 75a and a front-side main body 75b.
- the rear-side main body 75a and the front-side main body 75b are each annular.
- the rear side main body 75a and the front side main body 75b are overlapped in the axial direction (Z-axis direction).
- the rear side main body 75a is disposed on the rear side (+ Z side) of the front side main body 75b.
- the rear-side main body 75a is provided with a plurality of through holes that penetrate the rear-side main body 75a in the axial direction (Z-axis direction).
- a plurality of first protrusions 76 are arranged on the rear side (+ Z side) main body part rear surface 75c of the rear side main body part 75a.
- the first protrusion 76 protrudes rearward from the main body rear surface 75c. That is, the first protrusion 76 protrudes from the main body 75 to the rear side.
- a plurality of second protrusions 77 are arranged on the rear side (+ Z side) surface of the front side main body 75b.
- the second protrusion 77 protrudes rearward from the rear surface of the front main body 75b.
- the second protrusion 77 protrudes rearward from the main body rear surface 75c through a through-hole disposed in the rear main body 75a.
- the rear side (+ Z side) end of the second protrusion 77 is welded to the main body rear surface 75c. Thereby, the rear side main body 75a is fixed to the front side main body 75b.
- the insertion hole portion 56 a is disposed in the flange portion 56 of the contamination cover 50.
- the first protrusion 76 is passed through the insertion hole 56a.
- the rear side (+ Z side) end portion of the first protrusion 76 is disposed on the rear side of the flange portion 56.
- the rear end portion of the first protrusion 76 is welded to the rear surface of the flange portion 56.
- the groove 75d is disposed on the rear side (+ Z side) surface of the front side main body 75b. As shown in FIG. 2, a part of the bus bar 72 is fitted into the groove 75d. A part of the bus bar 72 fitted in the groove 75d is overlapped and fixed on the rear side of the front side main body 75b with the rear side main body 75a. Thus, a part of the bus bar 72 fitted in the groove 75d is held by the bus bar holder 71. That is, the bus bar holder 71 holds the bus bar 72. *
- the bus bar 72 has at least one coil connection terminal 73.
- the bus bar 72 has a plurality of coil connection terminals 73.
- the coil connection terminal 73 is disposed on the radially inner side of the main body 75. In a plan view (XY plane view), the coil connection terminal 73 has a U-shape that opens radially outward.
- the front side main body 75b and the bearing holder 40 have a through hole through which the coil wiring 34 is inserted.
- the coil connection terminal 73 is electrically connected to the coil wiring 34. That is, the bus bar 72 is electrically connected to the coil wiring 34.
- Coil wiring 34 is disposed between the opposing portions of the coil connection terminal 73.
- the adjacent coil connection terminals 73 are crushed by the welding jig in a direction in which the coil wiring 34 is sandwiched, and the coil connection terminals 73 and the coil wiring 34 are connected.
- the connection method of the coil connection terminal 73 and the coil wiring 34 is not restricted to the above-mentioned method, It does not specifically limit.
- the bus bar 72 has at least one external connection terminal 74. That is, the bus bar unit 70 has at least one external connection terminal 74.
- the bus bar unit 70 (that is, the bus bar 72) has three external connection terminals 74.
- the external connection terminal 74 extends in the axial direction (Z-axis direction).
- the external connection terminal 74 extends to the rear side (+ Z side) from the contamination cover 50 via a notch 55 described later of the contamination cover 50. *
- the external connection terminal 74 is electrically connected to an external power source (not shown). That is, bus bar 72 is electrically connected to an external power source. As a result, current can flow through the stator 30 via the bus bar 72 and the coil wiring 34.
- the contamination cover 50 is disposed between the control board 60 and the bearing holder 40 in the axial direction (Z-axis direction). As described above, the contamination cover 50 is fixed to the bus bar holder 71. *
- the contamination cover 50 is a nonmagnetic material.
- the material of the contamination cover 50 is preferably resin.
- the contamination cover 50 includes a first convex portion 51, an annular plate portion 53, a second convex portion 52, and a flange portion 56. *
- the 1st convex part 51 is a hollow part which becomes convex on the rear side (+ Z side).
- the first convex portion 51 opens to the front side ( ⁇ Z side).
- the first convex portion 51 is preferably cylindrical with the central axis J as the center. *
- the first convex portion 51 covers the rear side (+ Z side) of the shaft 21 and the sensor magnet 63. That is, the contamination cover 50 covers the rear side of the shaft 21 and the sensor magnet 63.
- the first convex portion 51 covers a part of the rear side of the rear bearing 24.
- a part of the sensor magnet 63 is accommodated inside the first convex portion 51.
- the contamination adheres to the inside of the first convex portion 51.
- Contamination is, for example, dust, dust, magnetic powder, iron powder, and the like. Thereby, contamination of the sensor magnet 63 can be prevented from diffusing into the motor 1.
- the annular plate portion 53 is a plate-like portion and extends radially outward from the front side ( ⁇ Z side) end portion of the first convex portion 51. As shown in FIG. 4, the annular plate portion 53 has an annular shape with the central axis J as the center in plan view (XY view). As shown in FIG. 2, the annular plate portion 53 covers a part on the rear side (+ Z side) of the rear bearing 24. The annular plate portion 53 and the first convex portion 51 cover the entire rear side of the rear bearing 24. That is, the contamination cover 50 covers the rear side of the rear bearing 24. *
- the contamination cover 50 is disposed between the control board 60 and the bearing holder 40 in the axial direction (Z-axis direction).
- the contamination cover 50 covers the rear side (+ Z side) of the shaft 21, the rear bearing 24 and the sensor magnet 63. Therefore, contamination existing in the gap between the rear bearing 24 and the shaft 21 and contamination adhering from the sensor magnet 63 can be prevented from being blocked by the contamination cover 50 and adhering to the control board 60. Therefore, the motor of this embodiment has a structure that can suppress contamination from adhering to the control board 60.
- the contamination which comes out to the rear side from the clearance gap between the rear bearing 24 and the shaft 21 is a contamination which exists between the shaft 21 and the rotor core 22, for example.
- the contamination generated from the sensor magnet 63 is, for example, iron powder attached to the sensor magnet 63.
- the second convex portion 52 is a hollow portion that is convex on the rear side (+ Z side).
- the second convex portion 52 is disposed on the radially outer side of the first convex portion 51.
- the second convex portion 52 opens to the front side ( ⁇ Z side).
- the 2nd convex part 52 is cyclic
- the second convex portion 52 has an annular shape with the central axis J as the center. *
- the second convex portion 52 covers the rear side (+ Z side) of the hole 40 a of the bearing holder 40. That is, the contamination cover 50 covers the rear side of the hole 40 a of the bearing holder 40. Therefore, even if the contamination attached to the stator 30 is scattered to the rear side of the bearing holder 40 through the hole 40a through which the coil wiring 34 passes, the contamination generated from the stator 30 is controlled by the control board 60. It can suppress adhering to.
- the second convex portion 52 covers the rear side (+ Z side) of the coil wiring 34.
- the second convex portion 52 covers the rear side of the coil connection terminal 73. That is, the contamination cover 50 covers the rear side of the coil connection terminal 73. Therefore, even when the motor 1 includes the bus bar unit 70, contamination that enters the rear side of the bearing holder 40 through the hole 40 a can be prevented from adhering to the control board 60. *
- the second convex portion 52 covers the rear side (+ Z side) of the plurality of coil connection terminals 73. Therefore, when a plurality of coil connection terminals 73 are provided, the number of second protrusions 52 can be reduced. Thereby, the structure of the contamination cover 50 can be simplified. In the present embodiment, the second convex portion 52 covers the rear side of all the coil connection terminals 73. *
- the 2nd convex part 52 has the 2nd cover rear surface 52a located in the rear side (+ Z side).
- the first convex portion 51 is. It has the 1st cover rear surface 51a located in a rear side.
- the second cover rear surface 52a is located on the front side ( ⁇ Z side) with respect to the first cover rear surface 51a. That is, the rear-side end portion of the second convex portion 52 is located on the front side with respect to the rear-side end portion of the first convex portion 51. Therefore, the space on the rear side of the second convex portion 52 can be widened. Thereby, it can suppress that the components attached to the control board 60 contact with the contamination cover 50.
- a part of the coil connection terminal 73 is accommodated inside the second convex portion 52. Therefore, in the second convex portion 52, the position of the second cover rear surface 52a in the axial direction (Z-axis direction) can be arranged on the front side ( ⁇ Z side). Thereby, the space of the rear side of the 2nd convex part 52 can be made wider. Contamination entering the rear side (+ Z side) of the bearing holder 40 from the hole 40a can be adhered to the inside of the second convex portion 52. Therefore, it is possible to suppress contamination from diffusing inside the motor 1.
- a concave portion 53 a is disposed between the first convex portion 51 and the second convex portion 52 in the radial direction. That is, the contamination cover 50 has a concave portion 53 a located between the first convex portion 51 and the second convex portion 52 in the radial direction.
- the recess 53a is recessed on the front side ( ⁇ Z side).
- the outer shape of the recess 53 a is an annular shape centering on the central axis J in a plan view (XY plane view).
- the bottom surface of the recess 53a is a surface on the rear side (+ Z side) of the annular plate portion 53. Since the contamination cover 50 has the concave portion 53a, the space on the rear side (+ Z side) of the contamination cover 50 can be made wider.
- the first convex portion 51 has a first inner side surface 51 b that is a rear side (+ Z side) surface inside the first convex portion 51.
- the second convex portion 52 has a second inner side surface 52 b that is a rear side surface inside the second convex portion 52.
- the surface located between the first convex portion 51 and the second convex portion 52 in the radial direction is the first surface.
- the first inner surface 51b and the second inner surface 52b are located on the front side. *
- the surface located between the first convex portion 51 and the second convex portion 52 in the radial direction is the front surface of the annular plate portion 53.
- the gap in the axial direction (Z-axis direction) between the contamination cover 50 and the bearing holder 40 can be reduced between the radial directions of the first convex portion 51 and the second convex portion 52. Further, the gap in the axial direction (Z-axis direction) between the contamination cover 50 and the bus bar unit 70 can be reduced between the radial directions of the first convex portion 51 and the second convex portion 52. Thereby, the contamination adhering to the sensor magnet 63 and the contamination existing between the shaft 21 and the rear bearing 24 can be suppressed from moving to the second convex portion 52 side. Therefore, it is possible to prevent the contamination from diffusing inside the motor 1. *
- the bearing holder 40 has a holder rear surface 41 a located on the rear side (+ Z side) of the bearing holder 40.
- a distance in the axial direction (Z-axis direction) between the annular plate front surface 54 and the holder rear surface 41a is defined as a distance L1.
- a distance in the axial direction between the annular plate front surface 54 and the rear side surface of the bus bar holder 71 is a distance L2.
- the distance in the axial direction between the annular plate front surface 54 and the rear-side main body rear surface 75c of the rear-side main body 75a is defined as a distance L2.
- the holder rear surface 41 a is an end surface on the rear side of the holding portion 41. *
- a distance in the axial direction (Z-axis direction) between the first inner side surface 51b of the first convex portion 51 and the holder rear surface 41a is defined as a distance L3.
- a distance in the axial direction between the first inner surface 51b and the main body rear surface 75c is defined as a distance L4.
- a distance in the axial direction between the second inner surface 52b and the holder rear surface 41a is defined as a distance L5.
- a distance in the axial direction between the second inner surface 52b and the main body rear surface 75c is defined as a distance L6.
- the distance L1 is smaller than the distance L3, the distance L4, the distance L5, and the distance L6.
- the distance L2 is smaller than the distance L3, the distance L4, the distance L5, and the distance L6. That is, the distance between the annular plate portion front surface 54 and the holder rear surface 41a or the distance between the annular plate portion front surface 54 and the main body portion rear surface 75c is determined between the first inner side surface 51b and the second inner side surface 52b. The distance from the holder rear surface 41a or the main body rear surface 75c surface is smaller. *
- the distance L2 is smaller than the distance L1. It is preferable that the distance L1 and the distance L2 are equal to or smaller than the size of contamination generated in the drive unit of the motor 1. Thereby, it can suppress more that a contamination spread
- the contamination which arises in the drive part of the motor 1 is a contamination which comes out from the clearance gap etc. of the stator 30, the sensor magnet 63, the shaft 21, and the rear bearing 24, for example. *
- the flange portion 56 extends radially outward from the front side ( ⁇ Z side) end portion of the radially outer edge of the second convex portion 52.
- the front side surface of the flange portion 56 is in contact with the main body portion rear surface 75 c of the main body portion 75.
- the flange portion 56 has a shape in which a part of a ring concentric with the central axis J is cut out.
- a notch portion 55 is disposed in the flange portion 56. That is, the contamination cover 50 has a notch 55.
- the cutout portion 55 is a portion cut out along the Y-axis direction, for example.
- the external connection terminal 74 of the bus bar 72 extends to the rear side (+ Z side) with respect to the contamination cover 50 through the notch 55. Therefore, the external connection terminal 74 can be pulled out to the rear side of the contamination cover 50 while making the contamination cover 50 simple.
- the flange portion 56 is provided with an insertion hole portion 56a and an insertion notch portion 56b.
- the insertion hole portion 56 a and the insertion notch portion 56 b are located on the radially outer side than the second convex portion 52.
- at least a part of the first protrusion 76 is inserted into the insertion hole 56a.
- At least a part of the second protrusion 77 is inserted into the insertion notch 56b. That is, the contamination cover 50 has a portion to be inserted which is a hole or a notch into which at least a part of the protruding portion of the bus bar holder 71 is inserted. Thereby, the contamination cover 50 can be positioned in the circumferential direction with respect to the bus bar holder 71.
- the contamination cover 50 can be fixed to the bus bar holder 71 by bringing the front side ( ⁇ Z side) surface of the flange portion 56 into contact with the main body portion rear surface 75c. Thereby, the space of the front side of the contamination cover 50 can be easily sealed.
- the contamination cover 50 is formed on the rear side (+ Z side) of the bus bar 72 by the first convex portion 51, the second convex portion 52, the annular plate portion 53, and the flange portion 56. Cover the whole.
- the internal space of the housing 10 is partitioned in the axial direction by the contamination cover 50, the bus bar unit 70, and the bearing holder 40.
- the space located on the front side ( ⁇ Z side) of the contamination cover 50 is sealed, for example. That is, the drive part of the motor 1 is sealed in the space on the front side inside the housing 10.
- the contamination cover 50 covers the through hole through which the front side main body 75b and the coil wiring 34 of the bearing holder 40 are inserted, so that the front side of the contamination cover 50 ( ⁇ Z The space located on the side) is sealed.
- the drive unit of the motor 1 includes, for example, the rotor 20, the stator 30, the rear bearing 24, the front bearing 25, and the sensor magnet 63. *
- the contamination which arises from the drive part of the motor 1 can prevent moving to the space located in the rear side (+ Z side) of the contamination cover 50 among the space inside the divided housing 10. . Therefore, according to the present embodiment, it is possible to prevent contamination generated in the drive unit of the motor 1 from adhering to the control board 60.
- a space is sealed includes that the contamination existing in the sealed space does not leak out of the space. That is, in the present specification, the term “sealed space” includes a case where a gap connecting the space and the outside of the space is provided as long as contamination can be confined in the space.
- the control board 60 is located on the rear side (+ Z side) of the bearing holder 40 as shown in FIG.
- the control board 60 is located on the rear side (+ Z side) of the contamination cover 50.
- the substrate surface of the control substrate 60 is perpendicular to the axial direction (Z-axis direction).
- the board surface of the control board 60 is, for example, the control board front face 60a on the front side ( ⁇ Z side) of the control board 60. Note that the substrate surface of the control substrate 60 is not necessarily perpendicular to the axial direction. *
- the control board 60 is fixed to the support portion 16 b of the control board housing 12.
- the control board 60 is fixed to the control board housing 12 with screws.
- the fixing method of the control board 60 is not specifically limited, You may fix by another method. Although illustration is omitted, printed wiring is provided on the board surface of the control board 60. *
- control board 60 of the present embodiment is located on the rear side (+ Z side) of the shaft 21. Therefore, the configuration of the contamination cover 50 that blocks contamination adhering to the control board 60 can be simplified. Further, the contamination cover 50 can easily block contamination.
- the rotation sensor 61 is attached to the control board 60. More specifically, the rotation sensor 61 is attached to the control board front surface 60a.
- the rotation sensor 61 faces the sensor magnet 63 in the axial direction (Z-axis direction) via the contamination cover 50.
- the rotation sensor 61 detects the rotation of the sensor magnet 63.
- the rotation sensor 61 is a magnetoresistive element.
- the rotation sensor 61 is not limited to a magnetoresistive element, and may be a Hall element, for example. *
- the electronic components 64 and 65 are attached to the control board 60. More specifically, the electronic components 64 and 65 are attached to the control board front surface 60a. The electronic components 64 and 65 are relatively large components among components attached to the control board 60.
- the electronic components 64 and 65 are, for example, electrolytic capacitors, choke coils, and the like. *
- the electronic components 64 and 65 oppose the recess 53a of the contamination cover 50 in the axial direction (Z-axis direction). Therefore, even when a dimensional error occurs in the contamination cover 50 or the control board 60, the electronic components 64 and 65 can be prevented from coming into contact with the contamination cover 50.
- the front end ( ⁇ Z side) end portion 64a of the electronic component 64 is accommodated in the recess 53a. Therefore, the control board 60 can be easily brought close to the contamination cover 50 in the axial direction, and the dimension of the entire motor 1 in the axial direction (Z-axis direction) can be reduced. Further, the rotation sensor 61 can be easily brought close to the sensor magnet 63 in the axial direction. Therefore, the detection accuracy of the rotation sensor 61 can be improved.
- At least a part of the contamination cover 50 may be located between the control board 60 and the bearing holder 40 in the axial direction. That is, in the present embodiment, for example, a part of the contamination cover 50 may be located on the rear side with respect to the control board 60, or may be located on the front side with respect to the bearing holder 40.
- the contamination cover 50 only needs to cover at least the rear side of the shaft 21, the rear bearing 24, and the sensor magnet 63. That is, in the present embodiment, the contamination cover 50 may not cover, for example, both the hole 40a of the bearing holder 40 and the coil connection terminal 73, or one of the rear sides.
- the entire sensor magnet 63 may be accommodated inside the first convex portion 51.
- the coil connection terminal 73 may be accommodated inside the second protrusion 52. That is, in the present embodiment, the entire coil connection terminal 73 may be accommodated inside the second convex portion 52.
- the second convex portion 52 may be provided for each coil connection terminal 73. In this case, the rear side of one coil connection terminal 73 is covered by one second convex portion 52.
- the front end 64a of the electronic component 64 may not be accommodated in the recess 53a.
- the electronic components 64 and 65 may oppose the 1st convex part 51 or the 2nd convex part 52 to an axial direction, for example.
- the sensor magnet 63 may be fitted and fixed to the outer peripheral surface of the shaft 21.
- the axial position of the rear end face of the sensor magnet 63 and the axial position of the rear end face of the shaft 21 may be the same.
- a Hall element is preferably used as the rotation sensor 61.
- the bus bar holder 71 may be a single member.
- the bus bar unit 70 can be manufactured by, for example, insert molding in which the bus bar 72 is inserted.
- the second protrusion 77 and the insertion notch 56b of the contamination cover 50 may not be provided.
- a bearing may be provided only on the rear side of the stator 30 and the shaft 21 may be supported in a cantilever manner.
- control board 60 may not be fixed to the housing 10.
- a support part extending from the contamination cover 50 to the rear side may be provided, and the control board 60 may be supported by the support part.
- a part of the bearing holder 40 may be located on the rear side of the sensor magnet 63.
- FIG. 5 is a schematic diagram showing the electric power steering apparatus 2 of the present embodiment.
- the electric power steering device 2 is mounted on a steering mechanism of a vehicle wheel.
- the electric power steering device 2 is a device that reduces the steering force by hydraulic pressure.
- the electric power steering apparatus 2 of the present embodiment includes a motor 1, a steering shaft 114, an oil pump 116, and a control valve 117. *
- the steering shaft 114 transmits the input from the steering 111 to the axle 113 having the wheels 112.
- the oil pump 116 generates hydraulic pressure in the power cylinder 115 that transmits driving force by hydraulic pressure to the axle 113.
- the control valve 117 controls the oil of the oil pump 116.
- the motor 1 is mounted as a drive source for the oil pump 116. *
- the electric power steering apparatus 2 includes the motor 1 of the present embodiment, contamination can be suppressed from adhering to the control board 60 of the motor 1. Thereby, the reliability of the electric power steering 2 can be improved.
- each said structure can be suitably combined in the range which is not mutually contradictory.
- SYMBOLS 1 ... Motor, 2 ... Electric power steering apparatus, 10 ... Housing, 11 ... Motor housing, 12 ... Control board housing, 20 ... Rotor, 21 ... Shaft, 22 ... Rotor core, 23 ... Rotor magnet, 24 ... Rear bearing, 30 ... Stator, 31 ... stator core, 33 ... coil, 34 ... coil wiring, 40 ... bearing holder, 40a ... hole, 50 ... contamination cover, 51 ... first convex part, 51b ... first inner surface, 52 ... first 2 convex portions, 52b ... second inner side surface, 53a ... concave portion, 54 ... ring plate front surface, 55 ... notched portion, 56a ... inserted hole portion, 56b ...
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- Motor Or Generator Frames (AREA)
- Power Steering Mechanism (AREA)
Abstract
Description
サ61の分解能を向上できる。その結果、モータ1の応答性を向上できる。
側(+Z側)に侵入したコンタミネーションを第2の凸部52の内側に付着させることができる。そのため、コンタミネーションがモータ1の内部に拡散することを抑制できる。
ミネーションカバー50の少なくとも一部が、制御基板60とベアリングホルダ40との軸方向の間に位置してもよい。すなわち、本実施形態においては、例えば、コンタミネーションカバー50の一部が、制御基板60よりもリア側に位置してもよく、ベアリングホルダ40よりもフロント側に位置してもよい。
Claims (13)
- 軸方向に延びる中心軸を中心とするシャフト、前記シャフトに固定されるロータコア、および前記ロータコアに固定されるロータマグネットを有するロータと、
前記ロータの径方向外側を囲むステータと、
前記ステータの前記軸方向の一方側に位置し、前記シャフトを支持するベアリングと、
前記ステータを保持し前記一方側に開口する筒状のモータハウジングと、
前記ステータの前記一方側に位置し、前記ベアリングを保持するベアリングホルダと、
前記ベアリングホルダの前記一方側に位置する制御基板と、
前記制御基板に取り付けられる回転センサと、
前記モータハウジングの前記一方側に位置し、前記制御基板を収容する制御基板ハウジングと、
前記ベアリングよりも前記一方側に位置し、前記シャフトに取り付けられるセンサマグネットと、
少なくとも一部が、前記制御基板と前記ベアリングホルダとの軸方向の間に位置し、かつ、前記シャフト、前記ベアリングおよび前記センサマグネットの前記一方側を覆う非磁性体のコンタミネーションカバーと、
を備えるモータ。 - 前記ステータは、ステータコアと、前記ステータコアを励磁するコイルと、を有し、
前記ベアリングホルダには、前記ベアリングホルダを軸方向に貫通する孔部が設けられ、
前記コイルには、少なくとも一部が前記孔部に挿入されるコイル配線が接続され、
前記コイル配線の前記一方側の端部は、前記ベアリングホルダよりも前記一方側に位置し、
前記コンタミネーションカバーは、前記孔部の前記一方側を覆う、請求項1に記載のモータ。 - 前記ベアリングホルダの前記一方側に位置するバスバーユニットを備え、
前記バスバーユニットは、
前記コイル配線と電気的に接続されるバスバーと、
前記バスバーを保持するバスバーホルダと、
を有し、
前記バスバーは、前記コイル配線と電気的に接続されるコイル接続端子を有し、
前記コンタミネーションカバーは、前記コイル接続端子の前記一方側を覆う、請求項2に記載のモータ。
- 前記コンタミネーションカバーは、
前記一方側に凸となる中空の第1の凸部と、
前記第1の凸部の径方向外側に位置し前記一方側に凸となる中空の第2の凸部と、
前記第1の凸部と前記第2の凸部との径方向の間に位置し前記軸方向の他方側に凹となる凹部と、
を有し、
前記第1の凸部および前記第2の凸部は、前記他方側に開口し、
前記第1の凸部の内側には、前記センサマグネットの少なくとも一部が収容され、
前記第2の凸部の内側には、前記コイル接続端子の少なくとも一部が収容される、請求項3に記載のモータ。
- 前記2の凸部の前記一方側の端部は、前記第1の凸部の前記一方側の端部よりも前記他方側に位置する、請求項4に記載のモータ。
- 前記コンタミネーションカバーの前記他方側の面のうち、前記第1の凸部と前記第2の凸部との径方向の間に位置するカバー面は、前記第1の凸部の内側における前記一方側の第1の内側面、および前記第2の凸部の内側における前記一方側の第2の内側面よりも前記他方側に位置し、
前記カバー面と、前記ベアリングホルダの前記一方側の面または前記バスバーホルダの前記一方側の面と、の距離は、前記第1の内側面および前記第2の内側面と、前記ベアリングホルダの前記一方側の面または前記バスバーホルダの前記一方側の面と、の距離よりも小さい、請求項4または5に記載のモータ。 - 前記コイル接続端子は、複数設けられ、
前記第2の凸部は、環状であり、
前記第2の凸部は、前記複数のコイル接続端子の前記一方側を覆う、請求項4から6のいずれか一項に記載のモータ。
- 前記制御基板に取り付けられる電子部品を備え、
前記電子部品は、前記凹部と軸方向に対向する、請求項4から7のいずれか一項に記載のモータ。
- 前記電子部品の前記他方側の端部は、前記凹部の内側に収容される、請求項8に記載のモータ。
- 前記バスバーホルダは、
本体部と、前記本体部から前記一方側に突出する突起部と、
を有し、
前記コンタミネーションカバーは、前記突起部の少なくとも一部が挿入される孔または切り欠きである被挿入部を有し、
前記被挿入部は、前記第2の凸部よりも径方向外側に位置する、請求項4から9のいずれか一項に記載のモータ。 - 前記コンタミネーションカバーは、切り欠き部を有し、
前記バスバーユニットは、外部接続端子を有し、
前記外部接続端子は、前記切り欠き部を介して前記コンタミネーションカバーよりも前記一方側に延びる、請求項3から10のいずれか一項に記載のモータ。 - 前記センサマグネットは、前記シャフトの前記一方側に位置する、請求項1から11のいずれか一項に記載のモータ。
- 請求項1から12のいずれか一項に記載のモータを備える電動パワーステアリング装置。
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KR1020177027689A KR102024616B1 (ko) | 2015-03-31 | 2016-03-29 | 모터, 및 전동 파워 스티어링 장치 |
US15/562,496 US10494014B2 (en) | 2015-03-31 | 2016-03-29 | Motor including nonmagnetic contamination cover and electric power steering device including same |
DE112016001510.0T DE112016001510T5 (de) | 2015-03-31 | 2016-03-29 | Motor und elektrische Servolenkvorrichtung |
CN201680019750.0A CN107431409B (zh) | 2015-03-31 | 2016-03-29 | 马达及电动助力转向装置 |
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JP2015071367A JP6543999B2 (ja) | 2015-03-31 | 2015-03-31 | モータ、および電動パワーステアリング装置 |
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JP (1) | JP6543999B2 (ja) |
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2016
- 2016-03-29 US US15/562,496 patent/US10494014B2/en active Active
- 2016-03-29 DE DE112016001510.0T patent/DE112016001510T5/de active Pending
- 2016-03-29 CN CN201680019750.0A patent/CN107431409B/zh active Active
- 2016-03-29 KR KR1020177027689A patent/KR102024616B1/ko active IP Right Grant
- 2016-03-29 WO PCT/JP2016/060181 patent/WO2016158978A1/ja active Application Filing
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US10300609B2 (en) | 2016-12-15 | 2019-05-28 | Boston Dynamics, Inc. | Motor and controller integration for a legged robot |
US10525601B2 (en) | 2016-12-15 | 2020-01-07 | Boston Dynamics, Inc. | Motor and controller integration for a legged robot |
JP2020502964A (ja) * | 2016-12-15 | 2020-01-23 | ボストン ダイナミクス,インコーポレイテッド | 脚付きロボット用のモーターおよびコントローラ一体化 |
JP2021182862A (ja) * | 2016-12-15 | 2021-11-25 | ボストン ダイナミクス,インコーポレイテッド | 脚付きロボット用のモーターおよびコントローラ一体化 |
US11522407B2 (en) * | 2017-06-26 | 2022-12-06 | Kyb Corporation | Electronic apparatus |
Also Published As
Publication number | Publication date |
---|---|
US20190077440A1 (en) | 2019-03-14 |
CN107431409A (zh) | 2017-12-01 |
KR20170120699A (ko) | 2017-10-31 |
JP2016192851A (ja) | 2016-11-10 |
CN107431409B (zh) | 2020-04-14 |
US10494014B2 (en) | 2019-12-03 |
DE112016001510T5 (de) | 2018-03-08 |
KR102024616B1 (ko) | 2019-09-24 |
JP6543999B2 (ja) | 2019-07-17 |
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