DC motor, AC motor, synchronous motor, asynchronous motor

by:V&T Technologies     2020-01-05
What is the difference between DC motor, AC motor, synchronous motor, asynchronous motor and stepping motor? 1. What is a DC motor? Answer: a rotating motor with DC power as its output or input is called a DC motor. 2. What is an AC motor? Answer: a rotating motor whose output or input is AC electric energy is called an AC motor. 3. What is a stepping motor? A: A stepping motor is an actuator that converts electrical pulses into angular displacement. Generally speaking, when the stepper driver receives a pulse signal, it drives the stepper motor to rotate at a fixed angle (And stepping angle). You can control the amount of angular displacement by controlling the number of pulses, so as to achieve the purpose of accurate positioning; At the same time, you can control the speed and acceleration of the motor by controlling the pulse frequency, thus achieving the purpose of speed regulation. There are three types of stepping motors: permanent magnet (PM), Reaction formula (VR)And hybrid (HB). Permanent magnet stepping is generally two-phase, with small torque and volume, and the stepping angle is generally 7. 5 degrees, or 15 degrees; Reactive stepping is generally three-phase, which can realize large torque output, and the stepping angle is generally 1. 5 degrees, but the noise and vibration are very large. It has been eliminated in 1980s in developed countries such as Europe and the United States; Hybrid Stepping refers to the combination of the advantages of permanent magnet and reactive type. It is divided into two phases and five phases: the stepping angle of the two phases is generally 1. 8 degrees and the five-phase step angle is generally 0. 72 degrees. This stepping motor is the most widely used. 4. What is a servo motor? A: servo motor is also called executive motor. In the automatic control system, it is used as executive element to convert the received electrical signal into angular displacement or angular velocity output on the motor shaft. It is divided into DC and AC servo motors, which are divided into two categories. Its main feature is that when the signal voltage is zero, there is no rotation phenomenon, and the rotating speed decreases at a constant speed with the increase of torque. 5. Asynchronous motors are only used for motors and rarely used as generators. Synchronous motors are used for power generation. The principle of asynchronous motor is mainly to introduce 3-phase alternating current into the stator to generate a rotating magnetic field with a rotating speed of n0, I . e. synchronous rotating speed. Different magnetic pole logarithm p will produce different n0, n0 = 60f/p under the action of alternating current with the same frequency f = 50Hz. The working principle is as follows: symmetrical 3-phase winding is introduced with symmetrical 3-phase current to generate a rotating magnetic field, and the magnetic field wire cuts the rotor winding. According to the principle of electric and magnetic induction, e and I are generated in the rotor winding, the rotor winding is subjected to electromagnetic force in the magnetic field, I . e. electromagnetic torque is generated to rotate the rotor, and the rotor outputs mechanical energy to drive the mechanical load to rotate. The rotor speed n NS pole will rotate synchronously with the rotating magnetic field, so it is called synchronous motor. Tag dc motor, AC motor
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