Three-phase permanent-magnetic brushless multi-gear hub motor

Abstract

A permanent-magnetic brushless multi-gear hub motor belongs to a motor with an external rotor and comprises a hollow cylindrical rotor shell 17, a group of permanent magnets 12 and a stator. The permanent magnets 12 are mounted on the inner side of the rotor shell 16, the stator consists of a stator iron core and three phase stator windings wound on the iron core, each phase stator winding consists of two or four phase winding units with identical total numbers of turns, the diameters of leads of windings in each phase winding unit are identical, the total sectional areas of the leads of the windings in each phase winding unit are also identical, and the two or four phase winding units in each phase stator winding are serially connected, or are connected in parallel or are in serial and parallel hybrid connection by a magnetic latching relay to realize gear changing. When the hub motor is started at a first gear, the two phase winding units of each phase stator winding are serially connected, or the four phase winding units of each phase stator winding are serially connected, and the three phase stator windings are in star connection; when the hub motor is accelerated at a second gear, the two phase winding units of each phase stator winding are connected in parallel, or the four phase winding units of each phase stator winding are in serial and parallel hybrid connection, and the three phase stator windings are in star connection; and when the hub motor runs at a high speed at a third gear, the two phase winding units of each phase stator winding are connected in parallel, and the three phase stator windings are in delta connection, or the four phase winding units of each phase stator winding are completely connected in parallel, and the three phase stator windings are in delta connection. The permanent-magnetic brushless multi-gear hub motor has the advantages that starting torque of an electric vehicle is high, and acceleration of the electric vehicle is fast.

Description

Technical field: [0001] The invention relates to a wheel hub motor of an electric vehicle, more precisely, relates to a three-phase permanent magnet brushless multi-speed hub motor that can be directly installed in the wheel hub of a car to drive the car. Background technique: [0002] Electric vehicles have technical requirements for motor speed and torque: high torque and low speed are required when starting, low torque requirements but high speed are required for normal driving, and a wide gap is required between the lowest speed and the highest speed. scope. [0003] At present, the known driving methods of domestic and foreign electric vehicles are as follows: [0004] 1. The inner rotor motor with fixed number of winding turns and winding wire diameter is used to transmit power to the wheels through the gear box, transmission shaft and differential, and then through the left and right transmission shafts in the rear axle. [0005] The disadvantage is that it needs to...

AI Technical Summary

Problems solved by technology

[0007] Disadvantages: Only the number of turns of the winding can be changed, but the cross-sectional area of ​​the winding wire cannot be changed, so that the rated current of the winding is limited, and the rated power is also limited, which cannot meet the requirements of the car to start climbing and high-speed driving

[0009] Disadvantages: However, because the winding data has not been adjusted accordingly, it is not suitable for long-term operation with high current, and the speed regulation range is narrow and the speed regulation gradient is large, which is far from the requirements of electric vehicles.

[0010] 4. The winding and wire diameter are switched by electronic switching elements such as silicon controlled rectifiers. In theory, the function of changing the motor speed and torque can be realized, but the minimum rated current of the silicon controlled silicon should be more than 200 amps, which is large in size and requires To realize the switching function of the motor winding, at least 20 such thyristors are required. If these thyristors are placed inside the motor, the volume of the motor is too large to be directly assembled with the wheel, so this solution is not suitable. implementable

[0011] This shows that the hub motor of above-mentioned existing electric vehicle still has many defectives, and needs to be improved urgently

Images