TH7029B - "Controller for compressors with induction motor" - Google Patents

Abstract

controller for compressor with an induction motor, including a microcomputer which finds the optimal number of rounds where the compressor performance is at its highest. When the frequency of the AC power supplied to the induction motor corresponds to the change in the load on the inverter circuit. is controlled by microcomputer and therefore the voltage output from the inverter circuit is adjusted in such a way that the induction motor is the optimal number of revolutions.

Claims (5)

1.Controller of an induction motor Which drives the compressor integrated in the cooling system consists of a generator consisting of a PWM system inverter circuit that includes a switching part. It is switched on or off according to a switching signal for generating AC power with variable voltage and variable frequency as a function of the compressor load to power the motor. A path for collecting data on the ideal number of revolutions of such a motor in relation to the variable voltage frequency produced by the generator. And supplied to the motor and the means for controlling the aforementioned variable voltage of the AC power Which is paid to the motor based on the most suitable number of revolutions read from the collection path To turn the motor's true number of revolutions into the ideal number of revolutions. The method for controlling the aforementioned variable voltage of the a.c. power It consists of a path for feeding the switching signal to the inverter circuit. To control the opening time of the said switching part Including the path for producing Pah waves Pathways for producing modulated waves The path for producing such switching signals is by comparing the level of the PAH with the level of the modulated wave and the path for adjusting the level of one or more of the PAH. And the aforementioned modulated wave corresponds to the aforementioned adjustable voltage 2. Control device according to claim 1, which the path for the production of the said wave Will include the way of counting Which is increased or decreased in response to the clock signal. And the way to produce such modulated waves It includes a collection path for storing modulated waves as data. 3. The regulator, as in claim 1, also contains a path for the actual number of turns of the motor. 4.How to change the compressor capacity corresponding to the change of critical load, the cooling cycle in which the compressor is driven by an AC induction motor. Consists of the steps of (a) producing AC power with variable voltage. And the frequency which is variable in response to the compressor load. The PWM system inverter circuit includes a switching part that turns on and off in accordance with the switching signal (b), collecting information about the ideal number of turns of an induction motor in relation to its frequency. (C) the change in frequency of such AC power supplied to the said induction motor in accordance with the change in the said load (d) the variable voltage regulation produced by the procedure. Such production By reading the ideal number of cycles from the stored data in accordance with the aforementioned variable frequency and (e) the said increase or decrease in the variable pressure. Of the AC power based on the optimum number of revolutions to make the actual number of such motors the ideal number of revolutions. By producing pah and modulated waves And compare the levels of the said waves To produce a switching signal to be used with the inverter switching segment to control the opening time and adjust the level of one of the pulses. And the modulated wave in accordance with the aforementioned variable voltage 5. The method in claim 4 also contains the procedure for measuring the actual number of revolutions of the motor.