Switch magnetic flux motor for directly driven electric vehicle

[0018] The present invention will be described in detail below in conjunction with the drawings.

[0019] Reference figure 1 , A switched flux motor for direct drive electric vehicles, including a switched flux motor 4, a resolver 5, a final drive, a differential 9, a half shaft 7, an axle housing 8 and driving wheels 6. The electric vehicle drive axle adopts an integral axle structure, the main reducer, the differential 9 and the half shaft 7 are arranged in the axle housing 8, and the two ends of the axle housing 8 are connected with two driving wheels 6. The power supply of the whole vehicle is provided by the battery, and the DC power provided by the battery is converted by the controller and then input to the switched magnetic flux motor 4. The output torque of the switched magnetic flux motor 4 is decelerated by the main reducer and then transmitted to the differential 9. The differential 9 performs the differential speed according to the driving conditions of the car and then outputs the power to the two half shafts 7 through the half shaft 7 Transfer to drive wheels 6. The use of integral axles in electric vehicles has outstanding advantages for simplifying the suspension structure, optimizing the layout of the vehicle, and improving the power and braking performance of the vehicle; the output torque of the switched flux motor 4 is transformed by the main reducer , Can significantly improve the dynamics of the vehicle. Adopting the connection mode of the differential 9 and the half shaft 7 can well realize the car's cornering ability and passability, and reduce the control requirements of the switching flux motor 4 due to the particularity of the car's driving conditions.

[0020] The main reducer adopts the form of single-stage hyperboloid gear or spiral bevel gear, in which the driving gear adopts the structure of gear shaft, and the driving gear shaft 2 and the motor rotor 4-1 of the switched magnetic flux motor 4 are made into one body. The front end cover of the switched magnetic flux motor 4 and the main reducer shell are made into one body. One end of the main reducer shell is designed as an outer flange structure to become the motor front end cover of the switched magnetic flux motor 4, which reduces the need for the motor and the main reducer. The number of parts is eliminated, and the connection element between the switched magnetic flux motor 4 and the main reducer is omitted, the overall structural size is reduced, and the motor is directly driven.

[0021] Such as figure 2 with image 3 , Switched flux motor 4 consists of a motor rotor 4-1, a stator core 4-2, a motor shell 4-3, twelve stator windings 4-4, six bolt and nut assemblies 4-5, and a motor The rear end cover 4-6, twelve permanent magnets 4-7 and the main reducer shell 1 are composed. The outer part of the main reducer housing 1 is the front end cover of the motor, the middle is connected to the driving gear shaft 2 through the motor bearing 3, the motor rotor 4-1 is fixedly connected to the driving gear shaft 2, and twelve are arranged inside the stator core 4-2 The stator winding 4-4 ​​and the twelve permanent magnets 4-7; the twelve stator windings 4-4 and the twelve permanent magnets 4-7 are arranged at intervals. Heat dissipation fins are arranged on the outer side of the motor housing 4-3, because the inner wall of the motor housing directly contacts the outer side surface of the stator core 4-2 of the motor. When the motor is working, the heat generated by the stator winding is dissipated into the air through the heat dissipation fins on the motor shell through conduction. The wire inlet of the switched magnetic flux motor 4 is arranged on the rear cover of the motor, which is convenient for installation on the one hand, and on the other hand, the wire inlet of the motor is arranged on the rear cover of the motor, and there is no need to process the wire on the motor shell. The hole and installation position simplify the structure of the motor housing.

[0022] The motor back end cover 4-6 of the switched flux motor adopts a transparent cover form, and the resolver 5 is installed on the outside of the motor back end cover 4-6. This installation method facilitates the coaxial installation of the resolver 5 and the motor 4, and other connecting parts such as couplings are not required between the two, and the connection relationship between the resolver 5 and the motor 4 is simplified.

[0023] Such as Figure 4 The stator core 4-2 is made of silicon steel sheets with a thickness of 0.35mm or 0.5mm. The cross section of the single silicon steel sheet that makes up the stator core 4-2 has twelve large radial sector slots and twelve large radial sector slots in the middle. The circular shape of a small radial sector groove. The outer side of the stator core 4-2 is fixedly installed on the inner hole wall of the motor housing. A gap of 0.5 to 1 mm is maintained between the tip arc of the convex teeth on the outer side of the motor rotor 4-1 and the smallest arc tip of the inner side of the stator core 4-2, forming a magnetic field air gap between the motor rotor and the stator core. The twelve permanent magnets 4-7 are arranged in the twelve large fan-shaped radial slots of the stator core 4-2, and the magnetic pole direction is along the axial direction of the stator core 4-2. The axial magnetic field is reversed. Twelve motor stator windings 4-4 are alternately arranged in twelve small sector-shaped radial slots of the stator core 4-2.

[0024] Such as Figure 5 , Motor rotor 4-1 The motor rotor 4-1 is a hollow cylindrical structure, and the outer side of the motor rotor 4-1 has a cylindrical structure with 10 fan-shaped external convex teeth uniformly distributed. It can be directly processed from bars of No. 5, 10, and 15 steel materials, and the outer teeth are directly processed by milling. The key slot is machined in the inner hole, which is connected with the driving gear shaft 2 through the key. The motor rotor (4-1) is not arranged with coil windings and permanent magnets. This integral structure simplifies the structure and processing of the motor rotor, and reduces the motor rotor The moment of inertia, the coil and permanent magnet will not fall off.

[0025] Such as Image 6 The resolver 5 is composed of a resolver stator 5-1, a resolver rotor 5-2, and a resolver coil 5-6; the resolver stator 5-1 is coaxially arranged outside the resolver rotor 5-2, and the resolver coil 5 6 is wound on the resolver stator 5-1; the resolver 5 is used to detect the speed and position of the switched flux motor when it rotates. The resolver rotor 5-2 is a cylinder with 5 arc-shaped convex teeth on the outer ring; 20 radial sector grooves are evenly arranged inside the resolver stator 5-1, and the resolver coil 5 is arranged in the grooves. 6; The resolver stator 5-1 is installed in the inner hole of the resolver housing 5-5, and is connected to the rear end cover of the motor through the cover plate 5-3 and the screws 5-4. The resolver rotor 5-2 is connected to the driving gear shaft 2, and is circumferentially fixed to the driving gear shaft 2 by a key, and axially fixed to the driving gear shaft 2 by a shaft end pressure plate and bolts. In this way, when the switched magnetic flux motor is working, the resolver 5 is driven to move together, so as to realize the detection of the rotation speed of the switched magnetic flux motor 4 and the position of the motor rotor.