Multi-stage type slope-perception current-limiting control device and method for motor

Abstract

The invention discloses a multi-stage type slope-perception current-limiting control device and method for a motor. The method comprises the following steps of: detecting an angle of a road surface slope by a slope sensor so as to supply slope change; with the help of a current feedback signal and a motor rotation speed signal, setting and controlling a multi-stage type current-limiting value; setting maximum current-limiting values of different sizes; and properly supplying extra energy to the motor so as to meet the change of the current environmental slope, wherein the electric energy consumption is effectively reduced; and the cruising ability is improved.

Description

technical field [0001] The invention relates to a motor control, especially a motor control and method with a multi-stage current limiting mechanism. Under the condition of a fixed power supply, the motor can distinguish the difference between the load size and the gradient change, and when the environment changes , will not reduce the climbing ability of the vehicle due to the increase of the load, and can increase the adaptability and application range of the vehicle. Background technique [0002] In general current-driven motor control, in order to avoid excessive current or peak signal generation, not only may cause adverse effects on current efficiency and cost, but also increase audible noise. Therefore, there is a current-limiting control device in the motor control device. When the control device encounters a current overload situation, it will start to limit the current output, so that the motor will operate below the maximum limit current, and prevent the motor coi...

AI Technical Summary

Problems solved by technology

[0005] However, in current brushless motor controllers with a current limiting mechanism, only a single current upper limit is set to protect the motor and the control device. The control device can only know the current load on the motor through the output current value. , so it is not possible to adapt to changes in the environment in the application, such as: climbing operation or loading heavy objects, etc.

In application, if the current upper limit is set too large, the climbing ability of the electric vehicle can be improved, but the endurance will decrease due to the large power consumption; if the current upper limit is set too small, the endurance of the electric vehicle can be reduced. It will be improved, but the climbing ability of the vehicle will inevitably decrease, so that when the brushless motor is applied to an electric vehicle, it can only achieve a balance between acceleration and endurance according to a current upper limit value, which cannot be controlled by the control device and the motor. Multi-stage current limit adjustment within the capability range cannot meet various environmental conditions. It provides the dual requirements of high climbing ability and high endurance, and reduces the convenience of use.

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