New variable speed ac motor Motor - Introducing a US Patent
The motor is a brushless, commutatorless AC motor whose speed can be accurately and simply adjusted within a relatively wide range, high efficiency at various speeds, and simple and robust structure. It can be powered by single or multi-phase AC power supplies of any voltage class from 25 Hz to 400 Hz or higher. The motor is essentially a synchronous motor that can operate at a much higher or lower speed than the nominal synchronous speed. The specific structure and operating principle of the motivation. The motor 10 is powered by a three-phase AC power source, and the rotor 12 includes a rotating shaft 14 on which an iron core 16 composed of a high magnetic permeability soft magnetic material such as a 3% silicon steel sheet is fixed. A layer of magnetization is arranged along the periphery of the outer cylindrical surface 18 of the core 16.
The variable speed ac motor without a brush, a slip ring, a permanent magnet and no coil or conductor on the rotor belongs to the field of asynchronous motors. In order to have a simple structure, the output power, the rotational speed and the power factor are adjustable, and the four magnets are mounted on the inner circumference of the press-fit stator to form two pairs of magnetic poles whose magnetic poles alternate with each other, one set Into the AC power supply. It becomes a variable parameter impedance circuit, and the other group is connected to a micro-level adjustable (variable) capacitor to become a variable parameter resonant circuit. The press-fitted sector rotors are magnetically separated by a non-magnetic material.
