Aspects of the hypocycloidal reluctance motor

The mode of operation of the hypocycloidal or rolling-rotor reluctance motor is discussed. The construction of the motor in its principal forms is reviewed. The unusual aspects of the motor´s operation are described and analysed, a method of solution of the torque equation is indicated, and analytical expressions for torque, valid for certain defined conditions, are derived. A theoretical value for the maximum torque/unit active rotor volume is derived, and an explanation is advanced for the high value obtained. The conflicting requirements encountered when producing a practical design are emphasised. Some results are given of tests made on a commercial motor, and the potential use of the device in high-torque, low-speed applications is discussed.