... the wheel backing, rings with drag ,the popular style is two-speed electric - driven, “A” is variable-frequency electromotor plus inverter ... of the amount of unbalance ,phase and real-time rotational speed, bases have adopted the overall foundry, stability is good. It ... of unbalancethe decrement of the amount of unbalancemotor powermode of speed regulationRYQ-30.1-335030-4503-22≤150400-10000 ≤0.5 ...