CN210693738U

CN210693738U - Permanent magnet synchronous hub motor with compact structure and high power density

Info

Publication number: CN210693738U
Application number: CN201921258323.5U
Authority: CN
Inventors: 邓隐北; 梅更德; 王志英; 谢志平
Original assignee: Sun Yongde
Current assignee: Sun Yongde
Priority date: 2019-08-06
Filing date: 2019-08-06
Publication date: 2020-06-05
Anticipated expiration: 2029-08-06

Abstract

The utility model relates to a compact structure and permanent magnet synchronous wheel hub motor who has high power density, including end cover (1), rotor core (2), rotor magnet steel (3), stator coil (4), stator core (5), the hollow fixed axle (6) of stator, solid axle (8), bearing (7) and (9), its characterized in that rotor magnet steel (3) are 20 magnetic poles that N, S polarity is alternate, the circumference equipartition, set up in the interior circumference of rotor core (2), and the material of magnet steel is N38 UH. The inner diameter of the stator is pressed and sleeved on the maximum excircle of the hollow fixed shaft (6), and the inner diameter of the hollow shaft is pressed and sleeved on the outer circumference of the solid shaft; one end of the solid shaft is inserted into an inner hole of a rear axle of the automobile; the hub motor and the hub are assembled and connected, a stud bolt penetrates through an end cover on one side of the hub motor and an original hole formed in an automobile hub, and the stud bolt is tightened and fixed into a whole, so that the permanent magnet synchronous hub motor with compact structure and high power density is formed.

Description

Permanent magnet synchronous hub motor with compact structure and high power density

Technical Field

The invention belongs to the technical field of electric automobiles, and particularly relates to a permanent magnet synchronous hub motor which is compact in structure and high in power density.

Background

Along with the development of new energy vehicles, a plurality of vehicles adopt an electric drive mode, exhaust emission and pollution are reduced, the electric vehicle can be used for providing power for starting and emergency acceleration and braking force during braking, and some vehicles can also realize energy recovery and utilization.

The hub motor is bound to become an ultimate solution of an electrically driven automobile, power, transmission and braking devices are creatively integrated on a hub, central driving is changed into distributed driving, transmission parts such as a transmission shaft and a differential are omitted, and integration of an engine and a speed change mechanism of a new energy automobile is achieved. Not only can reduce 80% of transmission mechanisms and 30% of self weight, but also can greatly improve the energy efficiency of the battery and prolong the driving range. The system has the advantages of high efficiency, energy conservation, light weight, miniaturization and the like, which cannot be achieved by domestic Electric Vehicles (EV) at present. The electric drive system for promoting the growth of the hub motor technology is unique in order to solve the problems of cost, energy consumption, pollution and the like of a new energy automobile.

The hub motor has various types, and according to statistics, 150 types of vehicle types in the first recommended catalog in 2017 are provided with Permanent Magnet Synchronous Motors (PMSM), accounting for 81%; the matching Alternating Current Asynchronous Motor (ACAM) has 33 types, and accounts for 18 percent; currently, the famous car enterprises in foreign countries, such as Activehybrid and i 3 of BMW; pruis and Leaf in toyota; a Teasa Model 3; civic Hybrid in Honda; both chevrolet, et al use PMSM. In addition, the switching magnetic group motor (SRM) has simple structure and control, large output, high reliability, low cost and good starting performance, but has the defects of large pulsation torque, large noise, serious nonlinearity and the like, so that the SRM cannot be popularized and applied to electric vehicles and is still in continuous research and development.

The PMSM has high power density, high power factor, wide rotating speed range and excellent speed regulating and controlling performance. And the electromagnetic structure is simple, the power AM is compared, and the size is reduced by more than 15%. Therefore, the hub motor of the invention adopts PMSM.

Disclosure of Invention

The utility model discloses an outer rotor type permanent magnet synchronous motor, its characteristics except that power density is high, turning moment is big, its structure is more convenient for be connected with the wheel hub of car moreover.

The outer rotor type PMSM mainly comprises a stator, a rotor and an end cover. The specific structure (see fig. 1) includes: the stator comprises a stator core 5, stator windings 4, a hollow fixed shaft 6 of a stator and a solid shaft 8 which is internally pressed and sleeved by the hollow fixed shaft, wherein the solid shaft 8 is pressed and sleeved in a rear axle of an automobile; the rotor comprises a rotor iron core 2 and rotor magnetic steel 3, wherein the magnetic steel 3 is 20 magnetic poles with alternate polarities (N, S) and uniformly distributed on the circumference and is arranged on the inner circumference of the rotor; the rotor is also provided with an outer rotor (the end covers are made of magnesium-aluminum alloy) which is formed by fixedly connecting the two sides of the rotor with a left end cover and a right end cover which are integrated; and a bearing and other parts arranged between the end cover fixing shafts. The motor has compact and firm integral structure, lightest unsprung mass and all performances suitable for the hub driving of the electric automobile.

Drawings

Fig. 1 is a general assembly view of an outer rotor type Permanent Magnet Synchronous (PMSM) hub motor. In the figure, (1) -end cap; (2) -a rotor core; (3) -rotor magnet steel; (4) -a stator coil; (5) -a stator core; (6) -a hollow stationary shaft; (7) -a bearing (31308); (8) a solid shaft; (9) a bearing (32012); (10) an air gap.

Fig. 2 is a structure view of a stator/rotor of a permanent magnet synchronous hub motor.

In the figure, (2) a rotor core; (3) a rotor magnetic steel; (4) a stator coil; (5) a stator core.

Fig. 3 shows the mounting position of the permanent magnet synchronous hub motor in the wheel and on the rear axle of the vehicle. In the figure, (11) a vehicle wheel; (12) a hub; (13) a PMSM hub motor; (14) a brake caliper; (15) a brake disc; (16) an automotive rear axle; (8) a solid shaft.

Detailed Description

The utility model discloses a realize high power density, stator core adopts DW360-50 cold rolled silicon steel sheet punching press superpose of thickness 0.5mm to form. The iron core is provided with 21 wire grooves with special groove design, the number of conductors in each groove is 16, and the wire diameter is 0.63 mm. The number of turns 56 of the armature winding is 1. The three-phase double-layer winding is arranged in 21 slots as follows: ABYBYBCZCZCZCZCAXAX. The minimum air gap g between the stator and the rotor is 1.2mm, so that the air gap magnetic density conforming to the optimal design is ensured. The magnetic steel model of each magnetic pole is 38UH (Br is 1.25T, Hcj is 1990KA/m, (BH) max is 38 MGOe). The hub motor is applied to an electric automobile, and besides various main performance parameters of the motor, such as rated power, torque, overload multiplying power, efficiency and the like, an important index is unsprung mass, so that the operation performance of the motor is greatly influenced, and the smaller the value is, the better the value is. Therefore, the magnesium-aluminum alloy which can meet the requirements of strength and rigidity and is the lightest in weight is selected as an end cover material, the weight is less than 20kg under the maximum power of 18Kw, and therefore the power density of the hub motor is high.

The utility model discloses an one of the structural feature has adopted the main shaft structure that hollow shaft and solid axle combine. The inner diameter of the stator is pressed and sleeved on the maximum excircle of the hollow shaft, and the inner diameter of the hollow shaft is pressed and sleeved on the outer diameter of the solid shaft. One end of the solid shaft is inserted into the inner hole of the rear axle of the automobile, so that the purpose that the stator is fixed on the rear axle is achieved, and the outer rotor (end cover) drives the hub to normally operate through the bearings on the two sides. The structure avoids a plurality of defects such as complex structure, limited space, reduced efficiency, difficult heat dissipation and the like of the hub motor installed in the wheel.

The utility model discloses an another structural feature is with automobile wheel hub's assembled joint simplest, only with 4 stud, pass on one side end cover of external rotor wheel hub motor and the automobile wheel hub originally 4 holes of opening, to the fastening decide can.

Claims

1. The utility model provides a compact structure and permanent magnetism synchronous wheel hub motor that has high power density, includes end cover (1), rotor core (2), rotor magnet steel (3), stator coil (4), stator core (5), hollow fixed axle (6), solid axle (8), bearing (7, 9) of stator, its characterized in that rotor magnet steel (3) are that 20N, S alternate polarity, the magnetic pole of circumference equipartition, set up in the interior circumference of rotor core (2), and the material of magnet steel is N38 UH.

2. The permanent magnet synchronous hub motor of claim 1, which is compact and has high power density, wherein the inner diameter of the stator is pressed on the largest outer circle of the hollow fixed shaft (6), and the inner diameter of the hollow shaft is pressed on the outer circle of the solid shaft; one end of the solid shaft is inserted into the inner hole of the rear axle of the automobile.

3. The compact permanent magnet synchronous hub motor with high power density as claimed in claim 1, wherein the permanent magnet synchronous hub motor is assembled with a hub by passing 4 stud bolts through the end cap at one side of the hub motor and 4 holes originally opened on the hub of the automobile.

4. The compact permanent magnet synchronous hub motor with high power density as claimed in claim 1, wherein the stator core is made by stamping and laminating DW360-50 cold rolled silicon steel sheets with thickness of 0.5mm, 21 slots are opened on the core, the number of conductors in each slot is 16, the wire diameter is 0.63mm, the number of turns of armature winding is 56, the number of parallel branches is 1, and the arrangement of three-phase double-layer winding in 21 slots is as follows: ABYBYBCZCZCZCZCAXAX.