There are two kinds of electromagnetic torque, the moving-coil torque and the reluctance torque, as according to how they are developed. The torque can be determined by the arbitrary displacement method on the principle of conservation of energy. A brief analysis of the torque and the energy process of reluctance motors has been made, with a correct expression for the reluctance torque. It is shown that the torque is independent of the rate of change of the stored magnetic energy in the direction... There are two kinds of electromagnetic torque, the moving-coil torque and the reluctance torque, as according to how they are developed. The torque can be determined by the arbitrary displacement method on the principle of conservation of energy. A brief analysis of the torque and the energy process of reluctance motors has been made, with a correct expression for the reluctance torque. It is shown that the torque is independent of the rate of change of the stored magnetic energy in the direction of the arbitrary angular displacement and that the reluctance motor is a constant-power machine. Because of the latter, a high output coefficient can still be obtained for the low-speed reluctance motor. |