# Which parameter controls the torque produced by an AC motor?

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A: The power supply voltage affects the torque produced by the motor. Torque is equal to approximately two times the power supply voltage.

## What are two methods of AC motor control?

Types of AC motor controllers

There are three main methods for doing this: variable voltage inversion (VVI), pulse-width-modulation (PWM), and flux vector drives.

## What determines dc motor speed?

DC controls adjust speed by varying the voltage sent to the motor (this differs from AC motor controls which adjust the line frequency to the motor). Typical no load or synchronous speeds for an AC fractional horsepower motor are 1800 or 3600 rpm, and 1000-5000 rpm for DC fractional hp motors.

## How do you determine if a motor is AC or DC?

Look for the stator core construction and rotor. If there is no commutator, then it is a AC motor. If there is a commutator and brushes, it may be either a DC motor or an AC commutator motor (Universal motor).

## How do I increase the rpm of my 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.

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## Can any AC 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.

## How are AC motors controlled?

An AC motor controller is known as the device that controls the speed of the AC motor. … The rectifier converts AC input into DC (direct current), while the inverter switches the DC voltage to an adjustable frequency AC output voltage. The inverter can also be used to control output current flow if needed.

## How do you start an AC motor?

AC commutator motors may be started by applying a reduced voltage or by shifting the brushes. Both of these methods are also employed for speed control, and in most cases starting can be satisfactorily affected by adjusting the control equipment to the low-speed position and then switching on full-line voltage.

## How can I increase the RPM of a 12v DC motor?

How to improve torque and RPM of a DC motor?

1. Case 1: Increase/Decrease strength of permanent magnets. What would happen to torque and RPM? …
2. Case 2: Increase/Decrease size of magnet wires. …
3. Case 3: Increase/Decrease the size of armature. …
4. Case 4: Increase/Decrease the number of turns (coil).

## What are the 3 types of DC motors?

Types of DC Motors. There are 3 main types of DC motor that are available:- Series, Shunt and Compound. These terms relate to the type of connection of the field windings with respect to the armature circuit.

## What is the maximum rpm of DC motor?

Speed @ maximum efficiency: 8600 RPM.