A direct torque control device and method for a DC biased sinusoidal current motor

Abstract

The invention discloses a direct torque control device and method for a direct-current bias sinusoidal current motor; the device comprises a speed regulator, a torque regulator, a flux linkage regulator, a 0-axis current regulator, a voltage vector selector, a first voltage phase shifting module, a second voltage phase shifting module, a first pulse width modulation module, a second pulse width modulation module, an inverter, a direct current bias sinusoidal current motor, a speed sensor and 3 / 2 static coordinate transformation module, a torque flux linkage observer and a duty ratio giving module. Aiming at the self structure characteristics of the direct-current bias sinusoidal current motor, the time for adjusting the direct-current bias current is reserved in the duty ratio giving module, so that the flexible adjustment of the direct-current bias current is realized, and the torque output capability of the direct-current bias sinusoidal current motor is effectively ensured; and meanwhile, the control system algorithm is simplified, the torque response speed of the motor is increased, and the control system is suitable for driving control of the motor.

Description

technical field [0001] The invention belongs to the field of AC motor and drive control, and more specifically relates to a direct torque control device and method for a DC bias sinusoidal current motor. Background technique [0002] Different from the traditional three-phase AC motor, the phase current of the DC bias sinusoidal current motor contains both the AC current component and the DC current component, and its waveform is as follows figure 1 shown. Among them, the DC part is used to construct the excitation magnetic field circuit, and the AC part is used to generate electromagnetic torque. The air-gap magnetic field can be flexibly adjusted by adjusting the DC bias current, so this motor has the characteristics of low cost, high reliability, and strong speed regulation ability, and has good application prospects. [0003] Direct torque control was first applied to the three-phase AC motor control system. This control method does not need to calculate the rotor posi...

AI Technical Summary

Problems solved by technology

[0005] Aiming at the defects or improvement needs of the prior art, the present invention provides a direct torque control device and method for a DC biased sinusoidal current motor, aiming to solve the problems of poor dynamic response and complex control strategy calculation process in the prior art

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