Driving motor assembly for electric vehicle

Abstract

The invention discloses a driving motor assembly for an electric vehicle. The driving motor assembly comprises a machine casing, a motor housing, an outer rotor brushless permanent magnet motor, a speed reducer and a brake, wherein the outer rotor brushless permanent magnet motor is arranged in the motor housing, the speed reducer is arranged in the machine casing, the brake is connected with themotor housing, the outer rotor brushless permanent magnet motor comprises a motor shaft, and the brake is connected with the motor shaft; the speed reducer comprises a first floating inner gear ring and a second floating inner gear ring, an inner gear of the speed reducer is in a split type, and comprises the first floating inner gear ring and the second floating inner gear ring, different modulican be set for planetary gears which achieve different stages of speed reduction, and the size of the speed reducer is reduced; the outer rotor brushless permanent magnet motor is adopted for the motor, and has large rotor rotation inertia, a small axial size, a steady rotation speed, high efficiency and large starting torque; besides, the machine casing is slidably connected with the first floating inner gear ring and the second floating inner gear ring through sliding keys and key grooves, and reduction of running noise of the speed reducer is facilitated.

Description

technical field [0001] The invention relates to the technical field of motors, in particular to a driving motor assembly for an electric vehicle. Background technique [0002] An electric motor is a rotary electric machine that converts electrical energy into mechanical energy, and it mainly includes an electromagnetic winding for generating a magnetic field, an iron core or permanent magnet, and a rotating armature or rotor. Under the action of the rotating magnetic field of the stator winding, a current passes through the effective side of the stator winding and is subjected to the action of the magnetic field to make it rotate. The motor is a machine that converts electrical energy into mechanical energy. The rotor of the outer rotor motor is placed outside the stator, and the moment of inertia of the rotor is relatively large, which is conducive to the stability of the speed. The stator is placed inside the rotor, the size of the winding end is small, and the volume of ...

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Problems solved by technology

In the case of multi-stage deceleration, an internal gear wheel is used, and the gear modules of each stage are the same. In the case of a larger output torque, more planetary gears need to be installed in each stage, or the same large-modulus gears are used at each stage to reduce the volume of the reducer. increase

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