Double-speed motor controller and control method thereof

Abstract

The invention discloses a double-speed motor controller and a control method thereof. The motor controller comprises a power supply connected with each circuit. The motor controller is characterized by consisting of a signal acquisition circuit, a microprocessor, a display circuit, a relay output circuit, a communication interface circuit, a transmitter circuit and a register; the signal acquisition circuit is connected with the display circuit, the relay output circuit, the communication interface circuit and the transmitter circuit through the microprocessor; the microprocessor is also connected with an online programming circuit and a memory; and the microprocessor is connected with an upper computer through the communication interface circuit to realize remote metering, remote control, remote regulation and remote communication of the double-speed motor controller. Because the structure and the method are adopted, the double-speed motor controller has the advantages that: three-phase current of a motor loop, voltage of one circuit and the like can be detected, the running state of the motor loop can be monitored at the same time, and fault protection such as thermal overload, blockage, three-phase current imbalance, over-voltage, under-voltage and the like are provided for the motor loop.

Description

technical field [0001] The invention relates to the field of motor control, in particular to a two-speed motor controller and a control method thereof. Background technique [0002] With the rapid development of today's society, how to make full use of energy and save energy has long been listed as an important issue. Two-speed motors are widely used in many projects because of their energy-saving features. The two-speed motor belongs to the asynchronous motor with pole-changing speed regulation. It changes the number of pole pairs of the stator rotating magnetic field by changing the connection method of the stator winding, thereby changing the speed of the motor. According to the formula; n=60f / p, it can be seen that the synchronous speed of the asynchronous motor is inversely proportional to the number of magnetic pole pairs. If the number of magnetic pole pairs doubles, the synchronous speed n will drop to half of the original speed, and the rated speed n of the motor w...

AI Technical Summary

Problems solved by technology

Traditional two-speed motor controller: the controller composed of ammeter, voltmeter, display lamp, button, time relay and thermal relay is not only large in size, but also has many secondary wirings, low reliability and difficult maintenance

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