A Compact Wireless Permanent Magnet Synchronous Motor System With Precise Speed and Position Control

Wireless motor systems incorporate wireless power transfer (WPT) technology to eliminate physical connections, enabling remote energy supply for motor drives. However, for the applications of ac-based motors like permanent magnet synchronous motors (PMSMs), challenges persist, including complex structure, intricate primary–secondary communication, and challenging current commutation. To solve these problems, this article introduces a novel wireless open-winding PMSM system characterized by a fully passive motor side, with energy and control signals managed at the transmitter side. This design streamlines the motor-side structure, eliminates motor-side control units and bulky capacitors, and simplifies primary–secondary communication. First, a decoupled two-channel WPT is designed for each winding to enable an independent energy supply for positive and negative winding current cycles. Second, a passive current conditioning circuit is devised for automatic current synthesis and commutation, ensuring the required ac winding current. Additionally, this article introduces unit power factor and amplitude modulation phase-shift controls, mitigating current distortion and power losses while enabling the co-transmission of energy and control signals. Finally, a 1000 r/min, 1.5 N·m wireless PMSM experimental platform validates the system's effectiveness. Experimental results show that the wireless PMSM can achieve seamless passive and automatic motor-side operation, as well as stable speed and position tracking.