Single Phase vs. Three Phase Induction Motor
Induction motor, also known as "asynchronous motor", is a device that puts the rotor in a rotating magnetic field and obtains a rotating torque under the action of the rotating magnetic field, so that the rotor rotates. The rotor of an induction motor is a rotatable conductor, usually in the shape of a squirrel cage. According to the type of alternating current, there are single phase induction motors and Three phase induction motors. So what is the difference between them? This is mainly reflected in the following aspects.
Working principle:
The principle of a single phase induction motor is that when a single phase sinusoidal current passes through the stator windings, the motor will generate an alternating magnetic field. The strength and direction of the magnetic field change sinusoidally with time, but its orientation in space is fixed, so this magnetic field is also called an alternating pulsating magnetic field.
A Three phase motor means that when the Three phase stator windings of the motor (each phase differs by 120 degrees in electrical angle) are connected to Three phase alternating current, a rotating magnetic field will be generated, which cuts the rotor windings.
Alternating current:
Single phase motors generally use single phase AC power and three phase induction motors uses a three phase AC power supply.
Definition:
Single phase induction motors usually have two-phase windings on the stator, and the rotor is a common squirrel cage. The distribution of the two-phase windings on the stator and the different power supply conditions can produce different starting characteristics and operating characteristics.
Three phase induction motor means that when the Three phase stator windings of the motor (each phase differs by 120 degrees in electrical angle) are connected to Three phase alternating current, a rotating magnetic field will be generated. The rotating magnetic field cuts the rotor windings to generate electricity. It includes Three phase synchronous motors and Three phase asynchronous motors.
Applications:
Single phase motors are closely related to people's daily life. Large amount in production. Especially with the improvement of people's living standards, the consumption of single phase induction motors is also increasing. It is used in production including micro water pumps, refiners, threshers, grinders, woodworking machinery, medical equipment, etc. In terms of life, there are electric fans, hair dryers, exhaust fans, washing machines, refrigerators, etc., and there are many types, But the power is smaller.
Three phase asynchronous motor is a kind of power equipment that converts electrical energy into mechanical energy and supplies it to production machinery. It is widely used in machinery, metallurgy, coal, petroleum, chemical and other industrial fields. Most production machinery is driven by Three phase induction motors as the prime mover. For example, all kinds of machine tools, lifting equipment, material handling devices, electric shovels, steel rolling mills, water pumps, fans and textile machinery. A modern factory needs hundreds or even tens of thousands of Three phase asynchronous motors.
