Motor system with a changeable power capacity and control method thereof

Abstract

A motor system includes at least two motors respectively having an output power and a rotary shaft selectively simultaneously operated with each other. A control unit is electrically connected to the at least two motors for receiving a controlling signal. The control unit controls the at least two motors according to the received controlling signal for adjusting an output power approaching to a power requirement of the electric actuator.

Description

technical field [0001] The invention relates to a motor system; in particular, it refers to a motor system with variable power capacity. Background technique [0002] At present, in the application of electric vehicles, in order to meet the needs of vehicle acceleration, motors with high power capacity are often used to provide the high torque output required for acceleration, but high power capacity motors (whether DC motors or AC motors) operate under light load or No-load idling will cause waste of electric energy. If the motor with high power capacity adopts an excitation motor, there will be waste of excitation electric energy. The above two wastes of electric energy are basically proportional to the size of the motor power capacity. Examples are as follows: [0003] The power required by a general vehicle at a constant speed: [0004] [0005] Assuming that the vehicle uses a high power capacity motor with a power of 100 kilowatts (KW), when the vehicle is driving ...

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Problems solved by technology

[0006] But when the vehicle is running at a lower speed, such as driving at 50 km / h, although the no-load power consumption is reduced to However, since the driving power consumption at this time also dropped to 2.4KW, the proportion of no-load power consumption increased significantly to That is to say, at a driving speed of 50 km / h, if the energy supply of the vehicle can originally provide the vehicle with a distance of 100 km, but in fact only 54.5% is actually used, that is, it can only travel to 54.5 km. In this way, when the vehicle is driving at a low speed in urban areas, a large amount of energy will be consumed, and the battery life will be greatly reduced.

[0007] However, although the use of low power capacity motors seems to directly and greatly improve the problem of no-load power consumption, low power capacity motors cannot cope with high power demands such as rapid acceleration or high-speed driving, so they do not meet actual needs

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