Wheel hub motor for electric vehicle

Abstract

A wheel hub motor for an electric vehicle includes eight sector-shaped through holes uniformly distributed in the circumference of a disc brake fixed to a shaft, and magnetic conductive ribs made of a magnetic conductive material arranged between two through holes. A stator core consists of nine square-C-shaped sub stator cores, each sub stator core surrounds two sides of the disc brake (6) and is fixed to a vehicle frame, adjacent sub stator cores are different by 30 degrees in a circumferential direction, a concentrated armature winding is wound around a yoke part at the middle portion of the sub stator core. A permanent magnet is fixed to a surface of an inner side of each sub stator core towards the disc brake, the brake caliper is fixed to the vehicle frame and is located at a position without the stator core in a circumferential direction.

Claims

1. A wheel hub motor for an electric vehicle, comprising a shaft, a hub, a stator core, armature windings, permanent magnets, a disc brake, a brake caliper and a bearing; wherein the disc brake fixed to the shaft is located on an inner side of the hub, eight sector-shaped through holes are uniformly distributed in the circumference of the disc brake, and a connection portion between two through holes is made of a magnetic conductive material; the shaft is mounted on a vehicle frame through the bearing and can drive the hub to rotate; the stator core consists of nine square-C-shaped sub stator cores, each sub stator core surrounds two sides of the disc brake and is fixed to the vehicle frame, and adjacent sub stator cores are different by 30 degrees in a circumferential direction; a permanent magnet is fixed to a surface of an inner side of each sub stator core towards the disc brake, and a magnetization direction of each permanent magnet is the same; an end face of the permanent magnet is sector-shaped; the sector-shaped end face of the permanent magnet and the sector-shaped through hole of the disc brake are aligned in a radial direction; a concentrated armature winding is wound around a yoke part at the middle portion of each pair of the sub stator cores, and winding directions of all armature coils are the same; and the brake caliper is fixed to the vehicle frame and is located at a position without the stator core in a circumferential direction, friction plates on inner sides of the brake caliper are located on two sides of the disc brake, and the disc brake is also utilized as a rotor of the motor and a braking round disc.

2. The wheel hub motor for an electric vehicle according to claim 1, wherein the external diameter of a sector of the sector-shaped through hole of the disc brake is greater than the external diameter of a sector of the end face of the armature pole, and the internal diameter of the sector of the sector-shaped through hole of the disc brake is less than the internal diameter of the sector of the end face of the armature pole.

3. A wheel hub motor for an electric vehicle, comprising a shaft, a hub, a stator core, armature windings, permanent magnets, a disc brake, a brake caliper and a bearing; wherein the disc brake fixed to the shaft is located on an inner side of the hub, nine sector-shaped through holes are uniformly distributed in the circumference of the disc brake, and a connection portion between two through holes is made of a magnetic conductive material; the shaft is mounted on a vehicle frame through the bearing and can drive the hub to rotate; the stator core consists of eight square-C-shaped sub stator cores, each sub stator core surrounds two sides of the disc brake and is fixed to the vehicle frame, and adjacent sub stator cores are different by 30 degrees in a circumferential direction; a permanent magnet is embedded in a yoke part at the middle portion of each sub stator core, and a magnetization direction of each permanent magnet is the same; each sub stator core has a pair of armature poles extending towards an inner side, and one surface of each armature pole towards the disc brake is sector-shaped; a concentrated armature winding is wound around a yoke part at the middle portion of each pair of the sub stator cores, and winding directions of all armature coils are the same; and the brake caliper is fixed to the vehicle frame and is located at a position without the stator core in a circumferential direction, friction plates on inner sides of the brake caliper are located on two sides of the disc brake, and the disc brake is also utilized as a rotor of the motor and a braking round disc.

Description

BRIEF DESCRIPTION OF THE DRAWINGS

(1) FIG. 1 is a schematic structural diagram of Embodiment 1 of a wheel hub motor for an electric vehicle of the present invention. In the drawing: 1—shaft, 2—hub, 3—stator core, 4—armature winding, 5—permanent magnet, 6—disc brake, 7—bearing, 8—brake caliper and 9—vehicle frame.

(2) FIG. 2 is a side view of Embodiment 1 of a wheel hub motor for an electric vehicle of the present invention. In the drawing: 1—shaft, 3—stator core, 4—armature winding, 6—disc brake and 8—brake caliper.

(3) FIG. 3 is a side view of a disc brake in Embodiment 1 of a wheel hub motor for an electric vehicle of the present invention. In the drawing: 1-shaft and 6-disc brake.

(4) FIG. 4 is a schematic diagram of a permanent magnet in Embodiment 1 of a wheel hub motor for an electric vehicle of the present invention. In the drawing: 1—shaft, 3—stator core, 5—permanent magnet, 6—disc brake, and 8—brake caliper.

(5) FIG. 5 is a schematic structural diagram of Embodiment 2 of a wheel hub motor for an electric vehicle of the present invention. In the drawing: 1—shaft, 2—hub, 3—stator core, 4—armature winding, 5—permanent magnet, 6—disc brake, 7—bearing, 8—brake caliper and 9—vehicle frame.

(6) FIG. 6 is a schematic diagram of a permanent magnet in Embodiment 2 of a wheel hub motor for an electric vehicle of the present invention. In the drawing: 3—stator core and 5—permanent magnet.

DETAILED DESCRIPTION OF THE ILLUSTRATED EMBODIMENTS

(7) FIG. 1 is a schematic structural diagram of Embodiment 1 of a wheel hub motor for an electric vehicle. The wheel hub motor for an electric vehicle includes a shaft, a hub, a stator core, armature windings, permanent magnets, a disc brake, a brake caliper and a bearing; the hub is fixed to a tail end of the shaft, an inner side of the hub is provided with the disc brake fixed to the shaft, and a vehicle frame is connected with the shaft through the bearing.

(8) FIG. 2 is a side view of Embodiment 1 of a wheel hub motor for an electric vehicle, including a stator core, armature windings, a disc brake and a brake caliper, the stator core consists of nine square-C-shaped sub stator cores, each sub stator core surrounds two sides of the disc brake and is fixed to a vehicle frame, and adjacent sub stator cores are different by 30 degrees in a circumferential direction.

(9) A concentrated armature winding is wound around a yoke part at the middle portion of each sub stator core, the armature winding is located between an armature pole and the permanent magnet, and winding directions of two armature coils in the same armature winding are opposite; and winding directions of the armature coils of adjacent armature windings are opposite; and the brake caliper is fixed to the vehicle frame and is located at a position without the stator core in a circumferential direction, and friction plates on inner sides of the brake caliper are located on two sides of the disc brake.

(10) FIG. 3 is a side view of a disc brake in Embodiment 1 of a wheel hub motor for an electric vehicle, including a shaft and a disc brake, eight sector-shaped through holes are uniformly distributed in the circumference of the disc brake, and magnetic conductive ribs made of a magnetic conductive material are arranged between two through holes. The external diameter of a sector of the sector-shaped through hole of the disc brake is greater than the external diameter of a sector of an end face of the armature pole, and the internal diameter of the sector of the sector-shaped through hole of the disc brake is less than the internal diameter of the sector of the end face of the armature pole.

(11) FIG. 4 is a side view of a permanent magnet in Embodiment 1 of a wheel hub motor for an electric vehicle. A permanent magnet is fixed to a surface of an inner side of each sub stator core towards a disc brake, and a magnetization direction of each permanent magnet is the same; an end face of the permanent magnet is sector-shaped; and the sector-shaped end face of the permanent magnet and the sector-shaped through hole of the disc brake are aligned in a radial direction.

(12) FIG. 5 is a schematic structural diagram of Embodiment 2 of a wheel hub motor for an electric vehicle, including a shaft, a hub, a stator core, armature windings, permanent magnets, a disc brake, a brake caliper and a bearing; the disc brake fixed to the shaft is located on an inner side of the hub while nine sector-shaped through holes are uniformly distributed in the circumference, and a connection portion between two through holes is made of a magnetic conductive material; the shaft is mounted on a vehicle frame through the bearing and can drive the hub to rotate; the stator core consists of eight square-C-shaped sub stator cores, each sub stator core surrounds two sides of the disc brake and is fixed to the vehicle frame, and adjacent sub stator cores are different by 30 degrees in a circumferential direction; a permanent magnet is embedded in a yoke part at the middle portion of each sub stator core, and a magnetization direction of each permanent magnet is the same; each sub stator core has a pair of armature poles extending towards an inner side, and one surface of each armature pole towards the disc brake is sector-shaped; and a concentrated armature winding is wound around the yoke part at the middle portion of each pair of the sub stator cores, and winding directions of all armature coils are the same.

(13) FIG. 6 is a schematic diagram of a permanent magnet in Embodiment 2 of a wheel hub motor for an electric vehicle. A stator core consists of eight square-C-shaped sub stator cores, each sub stator core surrounds two sides of a disc brake and is fixed to a vehicle frame, and adjacent sub stator cores are different by 30 degrees in a circumferential direction. A permanent magnet is embedded in a yoke part at the middle portion of each sub stator core, and a magnetization direction of each permanent magnet is the same.

(14) The working principle is as follows: the magnetic-conduction disc brake and the armature poles of the present invention are aligned, so, when a magnetic conductive portion of a saw blade is aligned with the armature pole, reluctance of an armature pole linkage is the minimum, and a flux linkage of the armature winding is the maximum; and when the sector-shaped through holes of the disc brake is aligned with the armature pole, the reluctance of the armature pole linkage is the maximum, and a flux linkage of the armature winding is the minimum.

(15) When the magnetic conductive portion of the disc brake is gradually close to the armature pole, self inductance of the armature winding is increased; and when the magnetic conductive portion of the disc brake is separated from the armature pole, the self inductance of the armature winding is also reduced. Due to smart combination of the number of the sector-shaped through holes of the saw blade and the number of the armature poles, the armature winding of each sub stator core has its unique phase.

(16) The self inductance of the armature winding of the motor of the present invention and the flux linkage of the armature winding linkage are continuously changed, so, if the exciting winding is powered on to provide an excitation magnetic field and a rotor core moves, the armature winding generates induced electromotive force. This is the principle of the motor of the present invention as recycled braking energy.

(17) When the motor of the present invention runs as an electric motor, a phase of a winding generating a positive induced electromotive force is charged with a forward current such that the winding can generate a positive torque; and a phase of a winding generating a negative induced electromotive force is charged with the forward current such that the winding can generate a negative torque. Three-phase current is charged according to different phases such that the rotor can be driven to rotate.