Method for controlling phase shifting stagger angle of doubly salient motor

Abstract

The invention discloses a method for controlling a phase shifting stagger angle of a doubly salient motor. The method comprises the following steps of: forming a phase-lock doubling circuit by using a duodecimal counter and a logic phase-lock loop chip; performing m times frequency doubling process on any phase position signal of three phase position signals by the phase-lock doubling circuit to acquire a doubling signal; connecting the three phase position signals and the doubling signal to a DSP processor acquisition port; establishing an angle pulse relation table of a phase shifting angle alpha, a stagger angle theta and the doubling signal pulses and importing the table into a DSP microprocessor; acquiring falling edges, which serve as the reference signal of switching on and switching off a power transistor, of every phase position signals of the doubly salient motor by the DSP processor acquisition interface; and resetting a phase conversion control by calling the angle pulse relation table to realize an on-off signal of the power transistor of the doubly salient motor and calculate the phase shifting angle alpha and the stagger angle theta. The method eliminates dead time between the upper and the lower power transistors, not only can ensure that the doubly salient motor realizes large output torque but also can reduce the torque of the output torque, and effectively improves the motor output.

Description

technical field [0001] The invention relates to a doubly salient motor, in particular to the angle control of the doubly salient motor, which belongs to the digital control technology of special motors. Background technique [0002] At present, doubly salient pole motors include different excitation methods and structures such as permanent magnet, electric excitation, hybrid excitation, and double stator structure. For the electric control of double salient motors, the standard angle control is generally adopted, that is, when the back EMF of the phase winding of the motor is positive, the positive power is energized; Under this standard angle control strategy, the rate of increase of the motor phase current is small, and the output torque of the motor is small at medium and high speeds. In order to improve the output of double-salient motors at medium and high speeds, advance angle control is often used. This advance angle control can improve the output of the motor, but i...

AI Technical Summary

Problems solved by technology

In order to improve the output of double-salient motors at medium and high speeds, advance angle control is often used. This advance angle control can improve the output of the motor, but its disadvantage is that there is a dead time in the process of advance angle control and standard angle control. , will cause the motor to generate torque ripple

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