# Quick Answer: What determines the speed of an AC motor?

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## What two factors determine the speed of an AC motor?

The rotating speed of an electric motor depends on two factors: its physical construction, and the frequency (Hz) of the voltage supply. Electrical engineers select the speed of a motor based on the needs of each application, similar to how the mechanical load determines the horsepower required.

## How do you increase the speed of an AC motor?

As several people have already stated, it is possible to increase the speed of an ac motor by increasing the input frequency to the motor. This is done in industry by adding a variable frequency drive.

## How do I lower the RPM on my AC motor?

1) Simply add a resistor in series. This will drop the voltage supplied, but likely increase current draw on the windings? When driving a fan with a shaded pole or permanent split capacitor (PSC) motor a variable resistor is the simplest way to reduce speed.

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

The two primary ways to control the speed of a single-phase AC motor is to either change the frequency of the line voltage the motor sees or by changing the voltage seen by the motor, thereby changing the rotational speed of the motor.

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## What factors determine synchronous speed?

Synchronous speed is a significant parameter for the rotating magnetic field-type AC motor. It is determined by the frequency and the number of magnetic poles.

## Can a 60hz motor run on 50hz?

For a generic answer: yes you can, IF: you reduce the voltage by 50/60, the equipment doesn’t care, you don’t care about potentially overheating the motor, the process/load can tolerate the lower speed/torque, etc.

## What would cause an AC electric motor to run too fast?

What would cause and AC electric motor to run too fast? Excessive applied voltage or shorted field windings. … How is the output voltage of an alternator controlled? By varying the field current that excites the alternator.

## Can I use a potentiometer to control AC motor speed?

If you mean that you want to control the speed of an AC fan with a potentiometer, it is probably not possible. Whether an AC “mains” fan can be speed controlled with a pot depends on the technology used. Single phase induction motor – capacitor start usually.

## Can any electric motor be variable speed?

To have electronically variable speed you will either need a universal/dc motor with PWM speed controller or a 3-phase inverter-duty induction motor with a variable-frequency inverter to control its speed.