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Take a look at a single-phase AC induction motor's speed torque curve, which describes what a motor will do once turned on. The motor will start at 0 r/min, then accelerate up to its rated speed. Notice how the input voltage affects the shape of the speed-torque curve.
A universal motor, which can run on either 120V single phase AC or DC, can be controlled by what is commonly called a "router speed control," but is actually an SCR DC speed control, or by a simple rheostat. The SCR controller is a better choice because it maintains constant torque.
A One phase AC motor speed control refers to ability of regulate the rotational speed of Uni-phase alternative (AC) Motor. This control action is possible by adjusting parameters such as voltage, frequency, or duty cycle of the applied waveform.
Permanent Split Capacitor (PSC) motors are the most popular type of single-phase induction motors. This article will discuss different techniques and drive topologies to control the speed of a PSC motor in one and two directions.
Fortunately, there are several speed control methods available for single-phase induction motors that can help address these issues. In this article, we will discuss the basics of single-phase induction motor speed control and explore the different options available.
By converting the input AC power to DC and then back to AC at variable output voltages and frequencies, VFDs can control single-phase motors without the need for additional equipment like phase converters or more complex three-phase setups.
In this post I have explained a single phase variable frequency drive circuit or a VFD circuit for controlling AC motor sped without affecting their operational specifications.
The KBWC Series provides infinitely variable speed motor control for shaded pole, permanent split capacitor and universal (AC/DC) motors. The full-wave phase control circuitry minimizes power loss, thereby reducing energy requirements.
I've read there are certain ways to control AC motors unlike DC motors and if not done properly you can damage the motor and/or it's windings. From what I understand is that most AC motor controllers chop the AC waveform up to either reduce or increase the HZ provided.
Figure 3.55 shows a speed control of single phase induction motor circuit using a diac-triac pair. The diac is meant to trigger the triac into conduction. It is preferable to use a matched diac-triac pair.