Electric motor
地域：
Shizuoka-ken
摘要
Provided is an electric motor in which it is possible to accurately leading-out terminal sections of a magnet wire that constitutes a stator coil in a prescribed leading-out direction as lead wires. A wire cover formed from a hard insulating resin is press-fitted into a wire leading-out hole provided in an end member that closes one end of a motor housing, and lead wires are led out to an exterior through through-holes provided in the wire cover. Crush ribs are provided to side surfaces of a head part of the wire cover, and, due to crushing of the crush ribs and press-fitting of the wire cover into the wire leading-out hole, the wire cover is prevented from inclining within the wire leading-out hole and a leading-out direction of the lead wires is prevented from deviating from the prescribed leading-out direction.
說明書
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The present invention relates to an electric motor used in order to drive electric power steering or other suitable loads.
The present invention pertains to an electric motor provided with a motor body that is formed from a stator and a rotor, and a motor housing that accommodates the motor body. The motor housing is configured from, e.g., a body portion having a cylindrical part, and first and second end members that respectively close one axial end and another axial end of the body portion.
The first and second end members that close the one end and the other end of the motor housing may be simple lids, or may be a combination of a lid and a frame that supports, inter alia, a component constituting a drive circuit of the motor. In addition, the first and second end members may be configured so that one of the end members is provided integrally with a body of the motor housing, or may be configured so that both of the end members are provided separately from the motor housing. Furthermore, in cases where a structure is employed in which the body portion of the motor housing is divided into a first housing half and a second housing half by an axial-direction intermediate part, and in which the body portion of the motor housing is assembled by linking the two housing halves, the first end member and the second end member can be formed on the first housing half and the second housing half, respectively.
In this specification, a rotating shaft of the motor is led to an exterior (toward a load side) from the second-end-member side among the first and second end members that respectively close one end side and another end side of the motor housing.
權(quán)利要求
What is claimed is:1. An electric motor in which a motor body is accommodated in a motor housing, the motor body comprising a stator that has a multiphase stator coil wound by a magnet wire and a rotor in which a magnetic field is configured by permanent magnets, the electric motor being such that a wire leading-out hole of which one axial end opens to an exterior and another axial end opens within the motor housing is provided in a metal end member that closes one axial end of the motor housing in a state in which an axis of the wire leading-out hole is oriented in a prescribed wire leading-out direction, among terminal portions of the magnet wire constituting the multiphase stator coil, terminal portions that must be led out to the exterior are used as lead wires, the lead wires are shaped so as to extend linearly along the prescribed wire leading-out direction through the wire leading-out hole, a wire cover that is formed from an insulating resin and has through-holes extending linearly is inserted into the wire leading-out hole in a state in which axis of the through-holes are oriented in the prescribed wire leading-out direction, and the lead wires are led out in the prescribed wire leading-out direction through the through-holes provided in the wire cover, whereinthe wire cover has, on side surfaces thereof, a plurality of crush ribs that are lined up along a circumferential direction of the wire leading-out hole, and is press-fitted into the wire leading-out hole in a state in which the crush ribs have been crushed, the wire cover also comprises a received part that has, at a portion arranged at a position nearer to another axial-end side of the wire leading-out hole than the crush ribs within the wire leading-out hole, a portion oriented toward the other axial-end side of the wire leading-out hole, and a wire cover receiving part is provided to an inner side of the wire leading-out hole, the wire cover receiving part having a portion oriented toward the received part of the wire cover inserted into the wire leading-out hole, and the received part of the wire cover inserted into the wire leading-out hole being received by the wire cover receiving part, wherein the wire cover integrally has a head part arranged near one axial end of the wire leading-out hole when the wire cover is inserted into the wire leading-out hole, and a trunk part arranged closer to the other axial-end side of the wire leading-out hole than the head part; the head part of the wire cover has an enlarged shape such that a contour line of a horizontal cross-section of the head part is arranged further to the outer side than a contour line of a horizontal cross-section of the trunk part, and the received part is formed at the end part of the head part that is near the trunk part; the wire leading-out hole has a first hole section that accommodates the head part of the wire cover, and a second hole section that accommodates the trunk part of the wire cover, the wire cover receiving part being provided at a boundary section between the first hole section and the second hole section; and the plurality of crush ribs are provided in a state of protruding from the side surfaces of the head part of the wire cover. 2. An electric motor in which a motor body is accommodated in a motor housing, the motor body comprising a stator that has a multiphase stator coil wound by a magnet wire and a rotor in which a magnetic field is configured by permanent magnets, the electric motor being such that a wire leading-out hole of which one axial end opens to an exterior and another axial end opens within the motor housing is provided in a metal end member that closes one axial end of the motor housing in a state in which an axis of the wire leading-out hole is oriented in a prescribed wire leading-out direction, among terminal portions of the magnet wire constituting the multiphase stator coil, terminal portions that must be led out to the exterior are used as lead wires, the lead wires are shaped so as to extend linearly along the prescribed wire leading-out direction through the wire leading-out hole, a wire cover that is formed from a hard an insulating resin and has through-holes extending linearly is inserted into the wire leading-out hole in a state in which axis of the through-holes are oriented in the prescribed wire leading-out direction, and the lead wires are led out in the prescribed wire leading-out direction through the through-holes provided in the wire cover, whereinthe wire cover has, on side surfaces thereof, a plurality of crush ribs that are lined up along a circumferential direction of the wire leading-out hole, and is press-fitted into the wire leading-out hole in a state in which the crush ribs have been crushed, the wire cover also comprises a received part that has, at a portion arranged at a position nearer to another axial-end side of the wire leading-out hole than the crush ribs within the wire leading-out hole, a portion oriented toward the other axial-end side of the wire leading-out hole, and a wire cover receiving part is provided to an inner side of the wire leading-out hole, the wire cover receiving part having a portion oriented toward the received part of the wire cover inserted into the wire leading-out hole, and the received part of the wire cover inserted into the wire leading-out hole being received by the wire cover receiving part, wherein a plurality of swaged parts lined up along a circumferential direction of an opening at one axial end of the wire leading-out hole are established at the end member, and the plurality of swaged parts are swaged so as to come into contact with the wire cover inserted into the wire leading-out hole, whereby the received part of the wire cover is pressed against the receiving part provided to the inner side of the wire leading-out hole. 3. The electric motor according to claim 2 , whereinthe wire cover has a plurality of recesses respectively corresponding to the plurality of swaged parts, the plurality of recesses being provided to an end part that is arranged near one axial end of the wire leading-out hole within the wire leading-out hole; and swaged portions of the swaged parts are accepted by the corresponding recesses. 4. The electric motor according to claim 3 , whereinthe wire cover integrally has a head part arranged near one axial end of the wire leading-out hole when the wire cover is inserted into the wire leading-out hole, and a trunk part arranged closer to the other axial-end side of the wire leading-out hole than the head part; the head part of the wire cover has an enlarged shape such that a contour line of a horizontal cross-section of the head part is arranged further to the outer side than a contour line of a horizontal cross-section of the trunk part, and the received part is formed at the end part of the head part that is near the trunk part; the wire leading-out hole has a first hole section that accommodates the head part of the wire cover, and a second hole section that accommodates the trunk part of the wire cover, the wire cover receiving part being provided at a boundary section between the first hole section and the second hole section; and the plurality of crush ribs are provided in a state of protruding from the side surfaces of the head part of the wire cover. 5. The electric motor according to claim 4 , wherein at least portions of the wire cover at which the crush ribs are provided, and at least portions of the wire leading-out hole at which the portions where the crush ribs are provided to the wire cover are press-fitted, are formed so that contour shapes of horizontal cross-sections in each section along each of the axial directions have N-fold symmetry (where N is an integer equal to or greater than 2) with respect to the respective center axis. 6. The electric motor according to claim 4 , wherein an electrical unit provided with a circuit that channels a drive current to the stator coil is attached to an outer side of the end member that closes the one axial end of the motor housing, and distal ends of the lead wires led out to the exterior through the through-holes in the wire cover are directly connected to terminal sections provided to the electrical unit. 7. The electric motor according to claim 3 , wherein at least portions of the wire cover at which the crush ribs are provided, and at least portions of the wire leading-out hole at which the portions where the crush ribs are provided to the wire cover are press-fitted, are formed so that contour shapes of horizontal cross-sections in each section along each of the axial directions have N-fold symmetry (where N is an integer equal to or greater than 2) with respect to the respective center axis. 8. The electric motor according to claim 3 , wherein an electrical unit provided with a circuit that channels a drive current to the stator coil is attached to an outer side of the end member that closes the one axial end of the motor housing, and distal ends of the lead wires led out to the exterior through the through-holes in the wire cover are directly connected to terminal sections provided to the electrical unit. 9. The electric motor according to claim 2 , whereinthe wire cover integrally has a head part arranged near one axial end of the wire leading-out hole when the wire cover is inserted into the wire leading-out hole, and a trunk part arranged closer to the other axial-end side of the wire leading-out hole than the head part; the head part of the wire cover has an enlarged shape such that a contour line of a horizontal cross-section of the head part is arranged further to the outer side than a contour line of a horizontal cross-section of the trunk part, and the received part is formed at the end part of the head part that is near the trunk part; the wire leading-out hole has a first hole section that accommodates the head part of the wire cover, and a second hole section that accommodates the trunk part of the wire cover, the wire cover receiving part being provided at a boundary section between the first hole section and the second hole section; and the plurality of crush ribs are provided in a state of protruding from the side surfaces of the head part of the wire cover. 10. The electric motor according to claim 9 , wherein at least portions of the wire cover at which the crush ribs are provided, and at least portions of the wire leading-out hole at which the portions where the crush ribs are provided to the wire cover are press-fitted, are formed so that contour shapes of horizontal cross-sections in each section along each of the axial directions have N-fold symmetry (where N is an integer equal to or greater than 2) with respect to the respective center axis. 11. The electric motor according to claim 9 , wherein an electrical unit provided with a circuit that channels a drive current to the stator coil is attached to an outer side of the end member that closes the one axial end of the motor housing, and distal ends of the lead wires led out to the exterior through the through-holes in the wire cover are directly connected to terminal sections provided to the electrical unit. 12. The electric motor according to claim 2 , wherein at least portions of the wire cover at which the crush ribs are provided, and at least portions of the wire leading-out hole at which the portions where the crush ribs are provided to the wire cover are press-fitted, are formed so that contour shapes of horizontal cross-sections in each section along each of the axial directions have N-fold symmetry (where N is an integer equal to or greater than 2) with respect to the respective center axis. 13. The electric motor according to claim 12 , wherein an electrical unit provided with a circuit that channels a drive current to the stator coil is attached to an outer side of the end member that closes the one axial end of the motor housing, and distal ends of the lead wires led out to the exterior through the through-holes in the wire cover are directly connected to terminal sections provided to the electrical unit. 14. The electric motor according to claim 2 , wherein an electrical unit provided with a circuit that channels a drive current to the stator coil is attached to an outer side of the end member that closes the one axial end of the motor housing, and distal ends of the lead wires led out to the exterior through the through-holes in the wire cover are directly connected to terminal sections provided to the electrical unit. 15. The electric motor according to claim 2 , wherein at least portions of the wire cover at which the crush ribs are provided, and at least portions of the wire leading-out hole at which the portions where the crush ribs are provided to the wire cover are press-fitted, are formed so that contour shapes of horizontal cross-sections in each section along each of the axial directions have N-fold symmetry where N is an integer equal to or greater than 2 with respect to the respective center axis. 16. The electric motor according to claim 15 , wherein an electrical unit provided with a circuit that channels a drive current to the stator coil is attached to an outer side of the end member that closes the one axial end of the motor housing, and distal ends of the lead wires led out to the exterior through the through-holes in the wire cover are directly connected to terminal sections provided to the electrical unit. 17. The electric motor according to claim 2 , wherein an electrical unit provided with a circuit that channels a drive current to the stator coil is attached to an outer side of the end member that closes the one axial end of the motor housing, and distal ends of the lead wires led out to the exterior through the through-holes in the wire cover are directly connected to terminal sections provided to the electrical unit.
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