Load torque control device and compensation process for synchronous reluctance motor

Abstract

The invention relates to a load torque control device of synchronous reluctance motor, which is used in the motor of compressor and not relative to the compressing pattern and the load mode, and via one algorism compensates the load torque, and the relative compensation method. The invention comprises: a load torque compensation part which utilizes the state variables of motor to calculate the load torque, and according to the calculated value to calculate the compensation current to be compensated to the load variable of said motor; a PI control part which outputs the reference torque current according to error between the reference speed and the actual rotary speed, the compensation current variable according to the load and applied by the load torque compensation part, and compensates the load torque. The invention can effectively reduce the vibration and noise of compressor which uses the motor and under the low-speed load character. And the invention can via a certain calculation method to calculate the compensation current which is not relative to the assembly accurateness of compressor, to carry out the accurate compensation control, while it can utilizes the same algorism to improve the control ability more under changed compression method.

Description

technical field [0001] The present invention relates to a synchronous reluctance motor, in particular to a load torque control device and a compensating method (Load TorqueController and compensation method of Synchronous ReluctaneeMotor). Background technique [0002] The so-called synchronous reluctance motor is a motor whose rotor and stator drive sources are synchronous. That is to say, after the stator is powered on, the motor with the least resistance generated on the rotating rotor. [0003] In particular, in order to drive the aforementioned synchronous reluctance motor, it is necessary to grasp motor speed information or magnetic field information. However, with a speed sensor or a magnetic field sensor such as a hole sensor or a pulse transducer, the installation position thereof is not easily determined. Also, they are environmentally sensitive, not durable in noisy environments, and economically expensive. Therefore, the control system of the synchronous relu...

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Problems solved by technology

Therefore, if there is an error in the data of the disk (10), there will be a problem that the load torque of the motor cannot be compensated normally.

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