An open-loop soft-start control method for switched reluctance motors

Abstract

The invention discloses an open-loop soft start control method for a switched reluctance motor. By a method of combining a current chopping circuit mode (CCC) and a voltage control mode (VC), a level set signal transmitted by a rotating handle or a pedal operated by an external operator is used as an open-loop input value; after being sampled by an analog-digital conversion (ADC) module arranged in a micro processor (CPU), the open-loop input value is converted to an open-loop control proportion coefficient; meanwhile, a chopping limit in the CCC mode and a pulse width modulation signal (PWM) in the VC mode are equally proportionally adjusted so as to output an upper switch power tube current chopping signal which is changed along with an input condition; therefore, the phase current peak value and phase voltage of the switched reluctance motor are synchronously controlled, and gradually changed controllable outputting of the motor from zero moment to the maximum moment is realized; an effect of soft start is achieved.

Description

technical field [0001] The invention relates to a starting method of a switched reluctance motor, in particular to an open-loop soft start control method of a switched reluctance motor. The effect of soft start is especially suitable for some occasions that require fine control, such as the adjustment of the jog position of electric loading and unloading vehicles, etc., to avoid the problem that the jog cannot be realized due to the excessive impact of vehicle startup caused by the traditional open-loop control method, which belongs to motor control technology field. Background technique [0002] Switched reluctance motor is a new type of speed control drive system developed with the rapid development of power electronics, microcomputer and control technology in the early 1980s. It has the outstanding characteristics of simple structure, reliable operation and high efficiency, and has become an AC motor speed control system. , DC motor speed control system and a strong comp...

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Problems solved by technology

Among the above methods, the first method has the problem of too much starting torque, and cannot obtain jog effect; the second method has the problem of poor control accuracy, and cannot obtain smooth control effect; the third method requires a lot of closed-loop adjustment processes, Convergence and stability are still to be seen, unable to quickly respond to the operator's given

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