Motor controller, power assembly, control method and electric vehicle

Abstract

The invention provides a motor controller (10), a power assembly (800), a control method and an electric vehicle (900), and relates to the technical field of electric vehicles (900). The input end of the motor controller (10) is connected with a power battery pack (30), the output end of the motor controller (10) is connected with a three-phase motor winding of a motor (20), and the motor controller (10) comprises an inverter circuit (101) and a controller (102). Wherein the input end of the inverter circuit (101) is the input end of the motor controller (10), and each phase of output end of the inverter circuit (101) is connected with one phase of motor winding of the motor (20). And the controller (102) is used for controlling the inverter circuit (101) to output current to the three-phase motor windings at the same time, and the current input into each phase motor winding sequentially and alternately reaches preset current. By using the motor controller (10), the heating capability of the motor winding is fully utilized to heat the power battery pack (30), the symmetry and reliability of the motor (20) are ensured, the use of an additional heating device to heat the power battery pack (30) can be avoided, and the occupied space and cost are reduced.

Description

technical field [0001] The present application relates to the technical field of electric vehicles, in particular to a motor controller, a power assembly, a control method and an electric vehicle. Background technique [0002] With the aggravation of energy shortage and environmental pollution in modern society, electric vehicles, as new energy vehicles, have received widespread attention from all walks of life. Electric vehicles are powered by a power battery pack, which converts electrical energy into mechanical energy through a motor to drive the motor. [0003] With the mass deployment of electric vehicles, many electric vehicles are used in areas that are cold in winter, or in areas that are cold at all times, and the power battery packs of electric vehicles have poor discharge performance at low temperatures, so the power battery packs need to have high efficiency Low-temperature heating measures to ensure that the power battery pack can output power to the motor with...

AI Technical Summary

Problems solved by technology

However, this heating method needs to add an additional heating device, which takes up space and increases the cost

[0006] Another heating method for the power battery pack in the prior art is: absorb the waste heat generated by the motor winding through a heat-conducting medium, and use it to heat the power battery pack, but this solution still faces two problems: First, only using the heat generated by the motor winding , the heating power is small, resulting in a slow heating speed; secondly, because this method uses the three-phase winding of the motor as a flow-through circuit, the way to inject current into the motor winding is: one-phase winding input current, and the other two-phase winding output current ; or the input current of one-phase winding, the output current of one-phase winding, and the current of the third-phase winding is zero, no matter in which way, the current of the three-phase windings cannot be equal, so the heating of the three-phase windings is uneven, and the heating is not Uniformity will firstly cause the one-phase winding with more heat to age faster, which will easily cause problems such as three-phase imbalance and affect the performance of the motor. Secondly, it will cause the temperature rise of the winding to be limited by the highest temperature one-phase winding. In this through-flow heating method, Unable to make full use of the heating capacity of the three-phase winding

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