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Permanent magnet slip clutch is a new type of contactless transmission device with the main feature of great energy-saving potential while it has difficulty in controlling speed regulation. Permanent magnet slip clutch and corresponding DC chopper speed regulating circuit were designed based on the requirements of the transmission mechanism in a new type of electronically controlled hydraulic power steering system (E-ECHPS) installed on a heavy-duty commercial vehicle. In the load condition, the speed regulating was perfectly functional and the operation was stable. In this case, the prototype of permanent magnetic slip clutch was developed and the bench test system was constructed. The relationship between output speed and duty cycle of speed regulating circuit in high load condition was obtained by experiment. The speed regulating response could meet the requirements of E-ECHPS. The results show that permanent magnet slip clutch has a good function and a reliable performance of speed regulating, and it is of great theoretical guidance and practical reference value for the design optimization of contactless transmission devices.

Experimental Investigation of Permanent Magnet Slip Clutch for Electronically Controlled Hydraulic Power Steering Application