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AC motor VS DC motor

Update:25-03-2020
Summary:

Let's have a look: AC motor is an electric motor driven […]

Let's have a look: AC motor is an electric motor driven by an alternating current (AC), and a DC motor is any of a class of rotary electrical motors that converts direct current electrical energy into mechanical energy. What is the difference between these two types of motors? This depends on the working principle of the motors.

First, the DC motor is powered by a DC power source. For example, a four-wheel drive vehicle used as a child, the dry battery used is a DC power source. The DC motor used in the factory is connected to a 220V AC power source that is converted to DC by a rectifier. Changing the power supply voltage can adjusting the motor speed from the rated speed down, but the current in the armature of the DC motor is alternating, why should it be altered? Here is the question of whether the rotor can rotate in a circle, read the book; The power supply of AC motors is AC power.

Due to the vector control theory of AC motors proposed by German engineers and some breakthroughs in AC motor technology, the monopoly of DC motors has been broken in the field of high-performance motor control. Then, the structure between the two is mainly composed of the stator and the rotor, but the respective roles of the rotor and the stator are quite different.

The armature of the DC motor is on the rotor, and the armature of the AC motor is on the stator. The structure of DC motors (armature, magnetic poles, commutators and brushes) is relatively simple. The core components are commutators and brushes (this part is the fatal weakness of DC motors). AC motors (more types) can be divided into Synchronous motors (mainly variable frequency speed regulation) and asynchronous motors. The air gap of asynchronous motors in AC motors is much smaller than the air gap of DC motors of the same capacity. To improve the power factor, the air gap should be as small as possible.