Method for controlling external rotor electric machine to change outout parameter and external rotor electric machine

Abstract

The present invention puts forward a method for controlling an external rotor electric machine to change an output parameter and an external rotor electric machine. The external rotor electric machine is provided with two external rotor electric machine units therein, a mechanical one-way clutch or an electromagnetic clutch is utilized to realize that a second rotor is controlled to connect or disconnect a first rotor. The second rotor is controlled to connect or disconnect the first rotor according to service condition and operating characteristic requirements, so as to obtain the most suitable dynamic characteristics and regenerative braking characteristics, thus the high-output ultrathin external rotor electric machine is obtained with a low cost, and the output parameters of the electric motor have a large variation range, thereby overcoming the vicious cycle between a high cost and a low yield of the special external rotor electric machine in the prior art.

Description

technical field [0001] The present invention relates to motors suitable for passenger cars, transportation machines, industrial machines, household electrical appliances, etc., and particularly relates to an outer rotor motor in which a rotor rotates around a fixed stator. Background technique [0002] In recent years, most of the vehicles driven by electric energy, or hybrid vehicles with electric energy, use outer rotor motors as in-wheel motors. Since the use of outer rotor in-wheel motors for vehicle drive is in the research and development stage, no unified standard has been formed. The external rotor motors designed and used by existing technologies for each model are all special types and cannot be used for all vehicles. [0003] Since the special-purpose external rotor motor is designed according to its specific use, although it achieves the effect of reasonable parameter design and good motor efficiency, it is necessary to design and develop various types of externa...

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Problems solved by technology

[0002] In recent years, most of the vehicles driven by electric energy, or hybrid vehicles with electric energy, use outer rotor motors as in-wheel motors. Since the use of outer rotor in-wheel motors for vehicle drive is in the research and development stage, no unified standard has been formed. The external rotor motors designed and used for each model with existing technology are all special types and cannot be used for all vehicles

[0003] Since the special-purpose external rotor motor is designed according to its specific use, although it achieves the effect of reasonable parameter design and good motor efficiency, it is necessary to design and develop various types of external rotor motors according to different uses of the motor. The production quantity is small and the production cost is high. Due to the limited application of special-purpose external rotor motors, the demand for special-purpose external-rotor motors is small, so that the external-rotor motors cannot be mass-produced, which is not conducive to the popularization of external-rotor motors. The lack of popularization of motors further increases the production cost, thus forming a vicious circle of high motor costs and the inability to popularize special-purpose external rotor motors

Moreover, the output parameters of the external rotor motor in the prior art are not variable or have a small range of variation. When the external rotor motor needs to be accelerated or regeneratively braked, the external rotor motor cannot be well adapted to this situation.

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