Synchronous motor and power system for extended-range electric vehicles

Abstract

The invention discloses a synchronous motor and a power system for extended-range electric vehicles. The synchronous motor comprises a housing, a first stator, a second stator, a permanent-magnet outer rotor, an electro-magnetic inner rotor, a motor input shaft, a motor output shaft, and a Hall sensor. The first stator and the second stator are located in an inner cavity and fixed to the housing. The first stator surrounds the second stator. A gap is left between the first stator and the second stator, and a cooling water channel is arranged in the gap. The motor input shaft is directly connected with an output shaft of an internal combustion engine. The motor output shaft is connected with a decelerator. The motor input shaft, the inner rotor and the second stator form an electro-magnetic synchronous motor, and the electro-magnetic synchronous motor is a generator. The first stator, the outer rotor and the motor output shaft form a built-in permanent-magnet synchronous motor, and the built-in permanent-magnet synchronous motor is a drive motor. Integrated manufacture of a generator and a drive motor in an extended-range electric vehicle is realized, so that the size is decreased greatly, and the space in an engine cabin is saved. The synchronous motor has the advantages of no interference between the electric generator and the drive motor, high vibration resistance, good heat radiation performance, low cost and the like.

Description

technical field [0001] The present application relates to an extended-range electric vehicle, in particular to a permanent magnet synchronous motor therein. Background technique [0002] New energy vehicles include pure electric vehicles, hybrid vehicles, and extended-range electric vehicles. Pure electric vehicles always use electric motors to drive the wheels, and due to the limited battery capacity, they need to be recharged frequently. A hybrid vehicle uses an electric motor and / or an internal combustion engine to drive the wheels under different operating conditions. Extended-range electric vehicles also always use electric motors to drive the wheels, and when the battery storage capacity is low, the internal combustion engine can recharge the batteries. [0003] see figure 1 , which is an existing power system of an extended-range electric vehicle, which includes an internal combustion engine 101 , a generator 102 , a driving motor 103 , a dual-motor controller 104 ...

AI Technical Summary

Problems solved by technology

[0011] Third, the first permanent magnet 6 in the outer rotor motor (drive motor) adopts a surface-mounted magnetic steel, which makes its anti-vibration ability relatively weak, and is not suitable for a more complicated working environment in the car; and the maximum speed is low, Restricts the maximum speed of the vehicle

[0012] Fourth, the inner rotor motor (generator) also uses a permanent magnet synchronous motor, and its rotor diameter is too small, so the efficiency of the motor is not high, and the price of the permanent magnet material is also relatively expensive, and the utilization rate of the magnet steel is not high

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