Three Phase Asynchronous Motor

Transport

 

FAQ

Q: How an AC Motor Works?

A:

AC Rotor and Stator

The key to an AC induction motor, where the field of the rotor is induced by the field of the stator, is that the rotor is always trying to catch up. It's always looking for stasis, so it's rotating to find that steady state. But the electromagnetic field produced by the stator using AC power is always going to be a little faster than the rotor's field. The spin of the rotor is creating the torque needed to create mechanical power to turn the wheels of a car or the whirr of a fan.

Some AC motors use a wound rotor, which is wrapped with wire instead of being a squirrel cage. The squirrel cage kind is more common, though. In either case, there's only one moving part in an AC motor, which means there are fewer things that need replacing or maintenance.

 

Motors Everywhere!

Look around your house and you will find that it is filled with electric motors. Since our homes use AC power, most of these gadgets have AC motors. DC motors are more likely to be found in things that use batteries. Starting in the kitchen, there are motors in:

The fan over the stove and in the microwave oven

The blender

The refrigerator - Two or three in fact: one for the compressor, one for the fan inside the refrigerator, as well as one in the icemaker

The stand mixer

In the utility room, there is an electric motor in:

The dryer

The electric screwdriver

The vacuum cleaner

The electric drill

The furnace blower

Even in the bathroom, there's a motor in:

The fan

The electric toothbrush

The hair dryer

The electric razor

Your car is loaded with electric motors:

Power windows

Power seats

Fans for the heater and the radiator

Windshield wipers

The starter motor

An AC motor might power your car rather than a gasoline engine

Plus, there are motors in all sorts of other places:

Computers

Smartphones

Toys

The garage door opener

Aquarium pumps

Almost everything that moves uses an electric motor to accomplish its movement.

Now That's Powerful

You might be wondering about electric cars, which use AC motors but run on batteries, which supply DC power. The answer is easy: Electric vehicles have an extra part, called a converter, that converts the DC power from the batteries to AC power that the motor can use.

 

What are the performance indicators of an electric motor?
The performance index of motor includes the following points:

1. Rotational speed: is the speed at which the motor rotates, usually expressed in revolutions per minute (RPM).

2. Torque: is the output torque of the motor, usually expressed in Newton meters (Nm) or pound feet (lb. ft).

3. power: refers to the output power of the motor, usually expressed in kilowatt (kW) or horsepower (HP). 4. efficiency: refers to the output power of the motor, usually expressed in kilowatt (kW) or horsepower (HP).

4. efficiency: is the ratio of motor output power to input power, usually expressed as a percentage (%). 5.

5. Energy efficiency grade: According to the national standard, the energy efficiency grade of electric motor is divided into four grades: IE1, IE2, IE3 and IE4, IE4 grade is the highest and the best efficiency.

6. Rated voltage: It refers to the rated working voltage of the motor, which is usually 380V, 660V, etc.

7. Rated power: refers to the rated output power of the motor, usually in kilowatt (kW).

8. Starting mode: including direct starting, star angle starting, soft starting and so on.

9. Load type: refers to the type of load applicable to the motor, including static load, dynamic load, etc.

 

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