Dear experts, how to explain stepless speed regulation and step speed regulation of motor?

Stepless speed regulation According to the patented prototype scheme of variable flux AC speed regulation motor, a servo motor is installed in the variable flux stepless speed regulation energy-saving motor, and the motor speed is adjusted by adjusting the axial displacement of the rotor. The housing is made of common Y series motor housings with the same cardinal number. The internal structure is basically the same as the existing squirrel-cage rotor motor, and 80% of the parts adopt the existing standards. One of its characteristics is that an annular induction rotor with a torque output shaft is installed inside the iron core, and the iron core is installed between rotor bars, and the inner copper sleeve is thin. The second feature is that a phase modulation rotor with bearings and DC excitation windings is installed inside the circular induction rotor, which can rotate freely on the shaft of the induction rotor.

When the speed needs to be adjusted, the excitation current is increased to improve the magnetic flux potential of the N. S polarity phase-modulated rotor. Because the iron core of the circular induction rotor has longitudinal magnetic slots, the two independent magnetic flux potentials of the stator and the phase-modulated rotor cannot self-circulate. As a result, the torque current and lag angle of the rotor decrease. Therefore, by controlling the excitation current of the phase-modulated rotor, the magnetic flux vector of the circular induction rotor and the input power of the stator can be controlled, so that the electromagnetic torque T of the circular induction rotor can be effectively controlled. The motor stepless speed regulation adopts multi-tap three-phase autotransformer with equal spacing, and each phase of the three-phase autotransformer is connected into a triangle from end to end; Or a three-phase transformer with a plurality of equally spaced taps in the secondary, and the end and the end of the secondary of the three-phase transformer are connected into a triangle. From a multi-tap three-phase autotransformer or three taps corresponding to the secondary of the three-phase transformer to an asynchronous motor, the corresponding taps are sequentially and circularly switched step by step in the way of motor driving or triggering the gate to turn off the thyristor, and the phase shift is gradually accumulated. The speed of asynchronous motor is changed by changing the tap speed.