CN105914982B - A kind of electric wheel hub of bilateral magnetic circuit - Google Patents

Abstract

An electric hub with bilateral magnetic circuits is composed of a hub, a shaft, two sets of rotor poles, two sets of stator poles, two sets of armature windings, a stator core, a permanent magnet, a hub cover and a bearing. The hubcap and hub are rotatable about an axis, which turns the wheel. The stator core is fixed in the middle of the shaft, and the two axial sides of the stator core are respectively two sets of rotor poles fixed on the hub. The end face of the stator core facing the rotor poles has fan-shaped protruding stator poles. An armature winding is wound around each stator pole. There is a magnetic isolation slot on the stator core between every three stator poles, and there is a radially magnetized permanent magnet between the slot bottoms of the two magnetic isolation slots. The technology of the present invention realizes the electric hub design in which the permanent magnet and the armature winding are located on the stator, the rotor has a simple structure and reliable operation; both end faces of the motor have a layer of air gap, and the contact surface between the stator and the rotor is large, so the ratio of the motor is High power.

Description

An electric hub with bilateral magnetic circuit

technical field

The invention relates to an electric wheel hub with double-sided magnetic circuits, belonging to the technical field of electric vehicles.

Background technique

In recent years, electric vehicles have gradually been accepted by consumers as an environmentally friendly and energy-saving means of transportation. The sales of electric vehicles in the world are also increasing year by year, both at home and abroad.

The electric hub integrates the motor and the transmission device into the hub, which can greatly simplify the transmission part of the electric vehicle, which is the first advantage of the hub motor. The second advantage of the hub motor is that it can realize flexible and diverse designs of the car. The hub motor has the characteristics of independent drive of a single wheel, so whether it is front-wheel drive, rear-drive, or four-wheel drive, it can be realized relatively easily. Full-time four-wheel drive This is very easy to implement on an electric hub drive vehicle. In view of the above analysis, it is necessary to develop a high torque, high power density electric hub.

Among the similar patents, the invention patent application with the authorization number 201010190582.6: electric bicycle hub, proposes an electric hub with an outer stator and inner rotor structure. The stator of the electric hub is fixed on the inner wall of the hub shell and can be used together with the hub shell Rotating, the rotor is connected with the planetary gear reduction mechanism.

Patent No. 201110182371.2 authorized invention patent: an electric wheel hub, which proposes a coaxially arranged motor and a combined structure hub, mainly used to support the coaxially arranged and mutually fixed first half of the motor and the wheel hub Shaft and second half shaft, electric hub for the gear transmission system that transmits the power of the motor to the hub. The gear transmission system is equipped with a two-gear electronically controlled shifting device, and the structure is relatively complicated. There are also some research results on motors with disc structures. The typical one is the patent authorized by Southeast University: a double-stator disc hybrid excitation motor, patent number: 201310301385.0, which proposes a motor with 12 U-shaped stator cores. In the disc hybrid excitation motor, the U-shaped stator core and permanent magnets (6) are alternately placed to form a stator disc, and the permanent magnets are alternately magnetized along the circumferential direction.

At present, the applicant has not retrieved any report about using a hub motor with a double-sided magnetic circuit with a disc structure.

The technology of the present invention realizes the design of the electric wheel hub in which the permanent magnet and the armature winding are located on the stator, and the rotor has a simple structure and reliable operation; the disc motor can effectively utilize the characteristics of large diameter and short axial length of the wheel hub to increase the power of the wheel hub motor ; There is a layer of air gap on both ends of the motor, and a set of permanent magnets is used to realize the excitation of the bilateral magnetic circuit, and the contact surface between the stator and the rotor is large, so the specific power of the motor is high.

Contents of the invention

In order to invent a hub motor with a double-sided magnetic circuit with a disc structure and realize reliable high-power-density driving, the present invention adopts the following technical solutions:

An electric wheel hub with a bilateral magnetic circuit, characterized in that:

Composed of hub (1), shaft (12), first rotor pole (2), first stator pole (3), first armature winding (4), stator core (5), permanent magnet (6), the first Two stator poles (7), a second armature winding (8), a second rotor pole (9), a hub cover (10) and a bearing (11);

Hub cover (10) is fixed on the port of wheel hub (1), and the central hole of hub cover (10) and wheel hub (1) fixes a bearing (11) respectively, and hub cover (10) and wheel hub (1) can be wound around axle ( 12) rotate, thereby driving the wheel to rotate;

The disc-shaped stator core (5) is fixed in the middle of the shaft (12), and the axial sides of the stator core (5) are respectively the first rotor pole (2) fixed on the hub (1) and the first rotor pole (2) fixed on the The second rotor pole (9) on the hub cover (10);

On the side of the stator core (5) facing the first rotor pole (2), there are first stator poles (3) protruding in a fan ring, and each first stator pole (3) is wound with a first armature winding (4); The stator core (5) has a second stator pole (7) protruding from the fan ring on the side facing the second rotor pole (9), and a second electric pole (7) is wound on each second stator pole (7). The armature winding (8); the first armature winding (4) and the second armature winding (8) are all concentrated windings;

On the stator core (5) between every three first stator poles (3), there is a magnetic separation slot distributed along the radial direction, and there is a permanent magnet (6) between the bottoms of the two magnetic separation slots. The magnet (6) is parallel to the shaft (12) and magnetized along the radial direction of the stator core (5), and the magnetization directions of adjacent permanent magnets (6) are opposite;

The three first armature windings (4) on the first stator pole (3) between the two magnetic isolation slots have the same winding direction; the three first armature windings (4) on the second stator pole (7) between the two magnetic isolation slots The winding directions of the two second armature windings (8) are the same; the winding directions of the first armature windings (4) on the first stator poles (3) on both sides of a magnetic isolation slot are opposite; the second stator windings on both sides of a magnetic isolation slot The second armature winding (8) on the pole (7) is wound in the opposite direction.

The electric wheel hub with bilateral magnetic circuit as described above is characterized in that: the wheel hub (1), the first rotor pole (2), the first stator pole (3), the stator core (5), the second stator pole ( 7), the second rotor pole (9) and the hub cover (10) are all non-oriented magnetically conductive materials.

The electric wheel hub with double-sided magnetic circuit as described above is characterized in that: the pole numbers of the first rotor pole (2) and the second rotor pole (9) are equal; the first stator pole (3) and the second stator pole (7) Align in the circumferential direction; set the angle between two adjacent rotor poles as the rotor pole pitch angle, and the difference between the first rotor pole (2) and the second rotor pole (9) in the circumferential direction is half a rotor pole distance angle.

The beneficial effects of the present invention are as follows:

⑴The permanent magnet and the armature winding are located on the electric hub design of the stator, the rotor structure is simple and the work is reliable;

(2) There is an air gap on both ends of the motor, and a set of permanent magnets is used to realize the excitation of the bilateral magnetic circuit, and the contact surface between the stator and rotor is large, so the specific power of the motor is high; (3) The armature winding and the excitation winding both use concentrated winding , the end is shorter and the copper loss is smaller;

(4) The axial length of the disc motor is small, which greatly reduces the volume of the motor, making the structure of the entire hub more compact, and it is convenient to install a motor controller on the hub shell.

Description of drawings

Fig. 1 is a longitudinal sectional view of an electric hub with a bilateral magnetic circuit according to the present invention. Among them: 1. hub, 2. first rotor pole, 3. first stator pole, 4. first armature winding, 5. stator core, 6. permanent magnet, 7. second stator pole, 8. second Armature winding, 9, second rotor pole, 10, hub cover, 11, bearing, 12, shaft.

Fig. 2 is a side view of the electric hub stator winding of a bilateral magnetic circuit of the present invention, wherein: 3, the first stator pole, 4, the first armature winding, 5, the stator core, 6, the permanent magnet, 12, the shaft.

Fig. 3 is a side view of electric hub rotor poles of a bilateral magnetic circuit of the present invention, wherein: 1, the hub, 2, the first rotor pole, 12, the shaft.

Fig. 4 is a working principle diagram of an electric hub with a bilateral magnetic circuit according to the present invention.

Detailed ways

The invention will be described in further detail below in conjunction with the accompanying drawings.

Fig. 1 is a longitudinal sectional view of an electric hub with a bilateral magnetic circuit according to the present invention.

An electric wheel hub with a bilateral magnetic circuit, characterized in that:

Composed of hub (1), shaft (12), first rotor pole (2), first stator pole (3), first armature winding (4), stator core (5), permanent magnet (6), the first Two stator poles (7), a second armature winding (8), a second rotor pole (9), a hub cover (10) and a bearing (11);

Hub cover (10) is fixed on the port of wheel hub (1), and the central hole of hub cover (10) and wheel hub (1) fixes a bearing (11) respectively, and hub cover (10) and wheel hub (1) can be wound around axle ( 12) rotate, thereby driving the wheel to rotate;

The disc-shaped stator core (5) is fixed in the middle of the shaft (12), and the axial sides of the stator core (5) are respectively the first rotor pole (2) fixed on the hub (1) and the first rotor pole (2) fixed on the The second rotor pole (9) on the hub cover (10);

On the side of the stator core (5) facing the first rotor pole (2), there are first stator poles (3) protruding in a fan ring, and each first stator pole (3) is wound with a first armature winding (4); The stator core (5) has a second stator pole (7) protruding from the fan ring on the side facing the second rotor pole (9), and a second electric pole (7) is wound on each second stator pole (7). The armature winding (8); the first armature winding (4) and the second armature winding (8) are all concentrated windings.

The electric wheel hub with bilateral magnetic circuit as described above is characterized in that: the wheel hub (1), the first rotor pole (2), the first stator pole (3), the stator core (5), the second stator pole ( 7), the second rotor pole (9) and the hub cover (10) are all non-oriented magnetically conductive materials.

Fig. 2 is a side view of the electric hub stator winding of a bilateral magnetic circuit of the present invention.

On the stator core (5) between every three first stator poles (3), there is a magnetic separation slot distributed along the radial direction, and there is a permanent magnet (6) between the bottoms of the two magnetic separation slots. The magnets (6) are parallel to the shaft (12) and magnetized along the radial direction of the stator core (5), and the magnetization directions of adjacent permanent magnets (6) are opposite.

The three first armature windings (4) on the first stator pole (3) between the two magnetic isolation slots have the same winding direction; the three first armature windings (4) on the second stator pole (7) between the two magnetic isolation slots The winding directions of the two second armature windings (8) are the same; the winding directions of the first armature windings (4) on the first stator poles (3) on both sides of a magnetic isolation slot are opposite; the second stator windings on both sides of a magnetic isolation slot The second armature winding (8) on the pole (7) is wound in the opposite direction.

Fig. 3 is a pole side view of an electric hub rotor with a bilateral magnetic circuit according to the present invention.

The number of poles of the first rotor pole (2) and the second rotor pole (9) is equal; the first stator pole (3) and the second stator pole (7) are aligned in the circumferential direction; The angle between them is the rotor pole pitch angle, and the difference between the first rotor pole (2) and the second rotor pole (9) in the circumferential direction is half of the rotor pole pitch angle.

Fig. 4 is a working principle diagram of an electric hub with a bilateral magnetic circuit according to the present invention.

The working principle of the electric wheel hub with bilateral magnetic circuit proposed by the present invention will be described below.

Tires are fixed on the outside of the wheel hub circumference. A flat cylinder is formed on the ports of the hub cap and the hub, and a bearing is respectively fixed in the central hole. The hub cap and the hub can rotate around the shaft, thereby driving the tire to rotate and driving the electric vehicle.

The electric hub works based on the working principle of the reluctance motor.

When the rotor pole completely overlaps the stator pole of one phase, the reluctance of the armature winding on the stator pole of this phase is the smallest, the flux linkage is the largest, and the self-inductance of the armature winding of the phase is also the largest. When the rotor pole is completely separated from the stator pole of a phase, the reluctance of the armature winding of this pole is the largest, the flux linkage is the smallest, and the self-inductance of the armature winding of this phase is also the smallest.

A three-phase bridge converter is used to supply power to the three-phase windings of the electric hub of the bilateral magnetic circuit.

The electric wheel hub of the bilateral magnetic circuit is used as a motor, and a forward current is passed to a phase winding whose self-inductance rises, then the winding can generate a positive torque; a forward current is passed to a phase winding whose self-inductance decreases, then This winding can generate negative torque.

The electric wheel hub of the double-sided magnetic circuit can also be operated as a generator to recover the braking energy of the vehicle.

Claims (3)

1. An electric wheel hub of a bilateral magnetic circuit, characterized in that: Composed of hub (1), shaft (12), first rotor pole (2), first stator pole (3), first armature winding (4), stator core (5), permanent magnet (6), the first Two stator poles (7), a second armature winding (8), a second rotor pole (9), a hub cover (10) and a bearing (11); The hub cover (10) is fixed on the port of the hub (1), and a bearing (11) is respectively fixed in the central hole of the hub cover (10) and the hub (1), The hubcap (10) and the hub (1) rotate around the shaft (12), thereby driving the wheel to rotate; The disc-shaped stator core (5) is fixed in the middle of the shaft (12), and the axial sides of the stator core (5) are respectively the first rotor pole (2) fixed on the hub (1) and the first rotor pole (2) fixed on the The second rotor pole (9) on the hub cover (10); On the side of the stator core (5) facing the first rotor pole (2), there are first stator poles (3) protruding in a fan ring, and each first stator pole (3) is wound with a first armature winding (4); The stator core (5) has a second stator pole (7) protruding from the fan ring on the side facing the second rotor pole (9), and a second electric pole (7) is wound on each second stator pole (7). The armature winding (8); the first armature winding (4) and the second armature winding (8) are all concentrated windings; On the stator core (5) between every three first stator poles (3), there is a magnetic separation slot distributed along the radial direction, and there is a permanent magnet (6) between the bottoms of the two magnetic separation slots. The magnet (6) is parallel to the shaft (12) and magnetized along the radial direction of the stator core (5), and the magnetization directions of adjacent permanent magnets (6) are opposite; The three first armature windings (4) on the first stator pole (3) between the two magnetic isolation slots have the same winding direction; the three first armature windings (4) on the second stator pole (7) between the two magnetic isolation slots The winding directions of the two second armature windings (8) are the same; the winding directions of the first armature windings (4) on the first stator poles (3) on both sides of a magnetic isolation slot are opposite; the second stator windings on both sides of a magnetic isolation slot The second armature winding (8) on the pole (7) is wound in the opposite direction. 2. The electric hub of a double-sided magnetic circuit as claimed in claim 1, characterized in that: the hub (1), the first rotor pole (2), the first stator pole (3), the stator core (5), The second stator pole (7), the second rotor pole (9) and the hub cover (10) are all non-oriented magnetically conductive materials. 3. The electric hub of a double-sided magnetic circuit as claimed in claim 1, characterized in that: the number of poles of the first rotor pole (2) and the second rotor pole (9) is equal; the first stator pole (3) It is aligned with the second stator pole (7) in the circumferential direction; the angle between two adjacent rotor poles is set as the rotor pole pitch angle, and the first rotor pole (2) and the second rotor pole (9) are aligned in the circumferential direction The difference is half the rotor pole pitch angle.