Single-winding single-phase AC motor control module

Abstract

The invention relates to a single-winding single-phase AC motor control module which comprises a single-phase AC motor winding. An inlet end of the single-phase AC motor winding is connected with one end of an external AC power supply, an outlet end of the single-phase AC motor winding is connected with an AC input end of a rectifier bridge, the other AC input end of the rectifier bridge is connected with the other end of the external AC power supply, a DC output end of the rectifier bridge is connected with one end of a driver, the other DC output end of the rectifier bridge is connected with the other end of the driver, and a control end of the driver is used for receiving PWM signals sent by a processing unit. According to the single-winding single-phase AC motor control module, a conventional single-phase AC motor secondary winding, a starting capacitor and a centrifugal switch are eliminated, and the defects that the secondary winding has to be arranged in the running process, running of the capacitor causes power decrease, starting currents are too large instantly, silicon controlled pressure regulating speed change low harmonic waves pollute power grids, default-phase type frequency modulation and speed regulation cost is high and output power is low are overcome.

Description

technical field [0001] The invention relates to the field of single-phase AC motors, in particular to a single-winding single-phase AC motor control module. Background technique [0002] When the single-winding single-phase AC motor is started, the superimposed torque is equal, the initial speed is zero, and there is no external force, so it cannot be rotated, but the motor rotor can be energized and run in the forward or reverse direction. Therefore, the existing single-phase motor has two windings, namely the starting winding and the running winding. The two windings are spaced 90 degrees apart. A capacitor with a large capacity is connected in series with the starting winding. When the running winding and the starting winding pass through single-phase alternating current, due to the effect of the capacitor, the current in the starting winding is 90 degrees ahead of the current in the running winding and reaches the maximum first. value. Two identical pulsed magnetic fi...

AI Technical Summary

Problems solved by technology

At this time, single-phase motors equipped with centrifugal switches can throw off the capacitor and start the winding to run, but this type of motor cannot be controlled by frequency conversion with lack of phase.

[0003] Existing single-phase motors have to run with auxiliary windings and capacitors, resulting in power drop, excessive starting current, low harmonic pollution of power grid due to voltage regulation and variable speed by silicon controlled rectifiers, high cost of phase-deficiency frequency regulation and low output power, etc. ills

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