Can any electric motor be variable speed?

No. Some motors cannot change their speed at all – steppers, induction motors and synchronous motors. Some motors require different speed control techniques – brushless DC, and many others. Variable speed drive can only be used with Squirrel cage induction motors due to their poor starting torque.

Which motor is used for variable speed?

For applications where variable speeds are necessary, typically an AC motor with an Inverter or brush motors are used. Brushless DC motors are an advanced option due to their wide speed range, low heat and maintenance-free operation. Stepper Motors offer high torque and smooth low speed operation.

Can a single phase motor be variable speed?

Speed control of single-phase induction motors is desirable in most motor control applications since it not only provides variable speed but also reduces energy consumption and audible noise. Most single-phase induction motors are unidirectional, which means they are designed to rotate in one direction.

Can any DC motor be variable speed?

In general if you don’t do anything special to it, a DC motor will have variable speed. The main factors are the DC voltage applied to the armature coil and the amount of torque load you are trying to drive. … If there is no label, it’s probably variable speed.

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What is the purpose of a variable speed motor?

Variable Speed Motor



A variable-speed motor is a component of high-performance residential furnaces and air handlers. Connected to fan blades, it moves air through your ductwork and into the different rooms of your home.

How do you slow down an AC motor?

Most DC motors can be slowed down by reducing the supply level of power, Volts, lower volts and resulting less amps, will create less electrical field and will slow motor down. For more gradual speed control there are electronic solutions that are called PWM (Pulse Width Modulation) controllers or Mosfet H bridges.

Can you speed control a PSC motor?

The 770-PSC Control offers a way to add existing single phase PSC or shaded pole motor fans to a building automation system. The 770-PSC control measures the motor’s RPM, using an easy to attach sensor, and can adjust the motor’s speed to match a chosen set point.

How do I lower the RPM on my electric motor?

A couple of things you can do:

  1. Use gears to change ratio of speed, which is what you’re going to do. …
  2. Use a stepper motor, which are commonly used for high-torque, low RPM applications.
  3. Find some sort of PWM control circuit to slow it down, although you probably won’t be able to get it down to 5-10RPM.

Can you slow down a single phase motor?

Slowing down a single phase AC motor can be complicated and expensive. They are usually built to be run at a certain speed and anything else would be tricking it to do something it wasn’t meant to. Simply slowing it down may cause it to overheat with reduced mechanical self-cooling.

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Can I put a rheostat on an electric motor?

If using a rheostat for motor control it is essential to understand that all types of direct current motors could be speed-controlled, however, a small amount of AC motors are controllable with rheostats. … Rheostats can be equipped with a fixed or an adjustable stop.

How do you control the speed of a single phase motor?

Is is possible to control the speed of an induction motor (single or three phase) by reducing the voltage. This will reduce the magnetizing current, flux, and thereby increase the slip, by essentially reducing the rating. Not all types of motors are designed to run with significant slip (e.g. more than 5%).

Can you slow down an electric motor?

Most DC motors can be slowed down by reducing the supply level of power, Volts, lower volts and resulting less amps, will create less electrical field and will slow motor down. For more gradual speed control there are electronic solutions that are called PWM (Pulse Width Modulation) controllers or Mosfet H bridges.

What makes a DC motor go faster?

Speed of a DC motor is directly proportional with the induced emf in the armature terminal and this induced emf is directly proportional with the supplied voltage…. So increasing supplied voltage causes more induced emf which makes the speed of the DC motor higher…

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