Method of recognizing moment of inertia of permanent magnet synchronous machine based on reduced-order current ring

Abstract

The invention discloses a method of recognizing rotational inertia of a permanent magnet synchronous machine based on a reduced-order current ring; current ring order reduction is performed according to motor electromagnetic parameters based on a current ring PI (proportional-integral) controller so that the current ring becomes a first-order response system; mechanical inertial parameters of the machine are acquired by measuring frequency response of the system under excitation of a reference torque of sinusoidal superposition direct-current bias. An algorithm may be integrated in a machine controller program just by using a universal converter, moment of inertia testing complexity is reduced, recognizing is simple and easy and is easy to implement in engineering, and the method is significant to the design of intelligent motor controllers.

Description

Technical field [0001] The invention relates to the field of electrical appliance control, in particular to a method for identifying the moment of inertia of a permanent magnet synchronous motor based on a reduced-order current loop. Background technique [0002] Permanent magnet synchronous motors have important and broad application prospects in servo systems, industrial drives, new energy vehicles and other fields due to their high power density, high efficiency, low torque ripple and excellent dynamic characteristics. In the motor controller, the rotor mechanical moment of inertia of the permanent magnet synchronous motor is an important parameter. It is very important for the speed loop design in the motor controller. There are mainly three types of traditional moment of inertia measurement schemes, namely, measurement using precision measuring instruments, recording measurement of motor acceleration and no-load deceleration, three-wire pendulum and simple pendulum measurem...

AI Technical Summary

Problems solved by technology

That is to say, the electromagnetic braking must be completed during the deceleration process of the motor, which cannot be completed by ordinary frequency converters. This method can only be completed by using four-quadrant frequency converters in the laboratory.

On the other hand, the direction of the no-load torque will change under positive and negative speeds. If the no-load torque is directly assumed to be 0, it does not conform to the actual working situation.

These two aspects restrict the system from being applied to special motors or general-purpose inverters, that is, this method has certain limitations.

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