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When we design the PM machines, accurate calculation of inductance parameters are very important. Inductance parameters have nonlinear characteristics along the magnet size, because of iron core is saturated by magnet flux and armature reaction flux. In this paper, we calculate inductance parameters by magnetic equivalent circuit method and finite element method. Moreover, we compensate the equation...
When we design an IPMSM, we start with the output and the voltage equations of the machines. The output equation has two terms which are magnetic torque and reluctance torque. The magnetic torque is related to the electric-and magnetic-loading but reluctance torque is related to one more variable which is the difference of the d-and q-axis inductance. Therefore it is very important to calculate or...
Cogging torque results from the interaction of the rotor magnets acting on the stator teeth or poles independent of any current. It is desirable to reduce the cogging torque since it may cause speed ripple and vibration, particularly at light load and low speed. When the motor equipped ring magnet, it is very effective to reduce the cogging torque as changing only the magnetization patterns of the...
The permanent magnet spindle motor for a hard disk or an optical disk drive is outer rotor type and the permanent magnet is mounted on the inner surface of the rotor. Because the motor is very small, the magnet for the motor is not a premagnetized segmented-magnet but a ring magnet which should be magnetized on the magnetization fixture. The magnetization distribution of the magnet is settled by a...
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