Refrigerating device

Abstract

The invention provides a refrigerating device, which can improve identification precision of electric inductance and can realize improvement of running efficiency. In a permanent magnet synchronous motor for driving compressor of refrigerating cycle, and an air conditioner of an inverter device which is treated with a variable control through vector control for rotary speed of electric motor, when the electric motor starts, during the vector control operates and after the end of the starting mode, the micro-computer of the inverter device executes an identification mode. In the identification mode and in the preset-time, the fixed velocity instruction value (omega <*>) and the first d shaft current instruction value (Id<*>) are fixed as the prescribed setting value. Then, under the identification mode, the difference between the second d shaft current instruction value (Id<**>) and the first current instruction value (Id<*>) is treated with integration for calculating the mean value, moreover an adjustment amount (delta L <*>) of the electric inductance setting value (L <*>) is calculated according to the mean value, after that, a vector control operation is executed by using electric inductance setting value (L <*>) with added adjustment amount (delta L <*>).

Description

technical field [0001] The present invention relates to, for example, refrigeration devices such as air conditioners and refrigerators, and more particularly, to a refrigeration device that variably controls the rotational speed of a permanent magnet synchronous motor that drives a compressor of a refrigeration cycle by an inverter device. Background technique [0002] For example, in refrigeration devices such as air conditioners and refrigerators, it is known to employ vector control in inverter devices in order to realize efficient operation. In vector control, since motor constants (specifically, resistance, induced voltage, and inductance) are used, the motor constants need to be set in advance. However, the motor constant fluctuates due to variations in the manufacture of the motor and operating conditions, and there is a possibility that a deviation may occur between a preset value and an actual value. Therefore, a vector control device has been proposed that discrim...

AI Technical Summary

Problems solved by technology

Therefore, it is easily affected by current ripples and phase fluctuations, and there is room for improvement in terms of the discrimination accuracy of inductance.

[0006] In addition, in the refrigerating apparatus, the cycle of the refrigerant is unstable at the start of operation, which causes load fluctuations, etc., resulting in an unstable state of the refrigerating cycle, and an area where the current of the motor for the compressor is unstable.

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