Permanent magnetic brushless speed-changing motor for electric vehicle and method thereof

Abstract

The invention relates to a driving motor of an electric vehicle, in particular to a motor of an electric bicycle and an electric motor cycle which can realize automatic stepless speed change. The driving motor is characterized in that a permanent brushless speed-changing motor consists of a motor, a centrifugal rotating speed sensing magnetic adjusting mechanism and a speed reducer; one end of a motor shaft is connected with a flux shunt 2 which rotates with a rotor, and a spring is arranged between the flux shut 2 and the rotor; the other end of the motor shaft is connected with a thrust disc 10 which is a conical surface round disc; a plurality of wedge-shaped spaces distributed radially are formed between the inner surface of the round disc and a bracket 8; the middle part is placed with a centrifugal roller 9; and the motor shaft 1, the rotor bracket 8, the centrifugal roller 9 and the thrust disc 10 form a centrifugal mechanism. Compared with the prior art and mechanical shift-changing regulation, the driving motor adopts continuous stepless speed regulation, has higher efficiency than that of the mechanical CVT stepless regulation (the efficiency of 60 percent to 70 percent)by more than 20 percent, and is more suitable for the common hidden board type rotor compared with the electric control weak magnetism ratio. The basic method is as follows: a flux shut mechanism is added in the motor so as to achieve the purpose of increasing the speed by weak magnetism and realize ideal driving characteristic. Due to simple mechanism and reliable working, the driving motor has very wide application prospect.

Description

technical field [0001] The invention relates to an electric vehicle drive motor, in particular to an electric bicycle and electric motorcycle motor capable of automatic stepless speed change. Background technique [0002] Due to the compact structure of permanent magnet brushless motors, small size, high power and high efficiency, and mature technology, small electric vehicles, especially electric mopeds, almost all use permanent magnet brushless motors. However, since this kind of motor uses rare earth permanent magnet excitation, the magnetic flux of the motor is almost non-adjustable, and the constant power adjustable speed ratio is low. For actual use and the range of working conditions, more power reserves are required, which is very uneconomical. [0003] In order to improve the performance of electric vehicles, a variety of mechanical variable speed motors have been developed in the industry, as well as two-speed motors or three-speed motors with variable windings. Ho...

AI Technical Summary

Problems solved by technology

The field weakening effect is not ideal for ordinary permanent magnet brushless motors

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