"AC motor" is a machine for converting mechanical energ […]
"AC motor" is a machine for converting mechanical energy and AC power. Due to the tremendous development of AC power systems, AC motors have become the most commonly used motors. Compared with DC motors, AC motors have no commutator (see commutation of DC motors), so they are simple in structure, easy to manufacture, and relatively robust. They are easy to make motors with high speed, high voltage, high current and large capacity. AC motor power covers a wide range, from a few watts to hundreds of thousands of kilowatts, or even millions of kilowatts. In the early 1980s, the largest steam turbine generator reached 1.5 million kilowatts. The AC motor was invented by the American Serbian scientist Nikola Tesla.
According to statistics, the classification of AC motors can be done in the following two ways:
AC motors are generally classified into alternators, AC motors, and synchronous cameras according to their functions. Due to the reversibility of the motor's operating state, the same motor can be used both as a generator and as an electric motor.
It is not very clear that the motor is divided into a generator and a motor. However, some motors mainly operate as generators, and some motors mainly operate as motors.
AC motors are divided into two categories: synchronous motors and asynchronous motors. The rotational speed ns of the synchronous motor rotor is the same as the rotational speed of the rotating magnetic field, and is called synchronous rotational speed. There is a strict relationship between ns and the frequency of the connected alternating current (f) and the number of magnetic pole pairs (P) of the motor.
In China, the power frequency is 50 Hz, so the synchronous speed of the one-pole motor in the three-phase AC motor is 3000 rpm, and the synchronous speed of the two-pole motor in the three-phase AC motor is 1500 rpm, and so on. The speed of the rotor of an asynchronous machine is always lower or higher than the speed of its rotating magnetic field, and the name of asynchronous comes from this. The difference between the rotor speed of an asynchronous motor and the rotational magnetic field speed (called the slip) is usually within 10%
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