Overview
Closeup
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IPM motors are increasingly used in applications such as air conditioners
and automobiles because they can utilize both reluctance torque and magnet
torque. Generally, equation (1) is used to segregate the magnet torque
and reluctance torque of an IPM motor.
The torque can be segregated by obtaining the inductance from equation
(1). However, the effect of the magnets/current on the magnetic circuit
cannot be visualized. This note presents the use of a magnetic field analysis
to segregate the torque and obtain the magnetic circuit produced by each
type of excitation force. |
Current Phase Angle versus Torque
| A graph of the current phase angle versus torque is indicated in Fig. 1.
The maximum torque is produced at a current phase angle near 20 degrees
as indicated in the graph. Furthermore, the magnet toque contributes more
to the total torque. |
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Magnetic Flux Density Distribution/Flux Lines
| A contour plot of the magnetic flux density distribution is indicated in
Fig. 2 and the flux lines are indicated in Fig. 3. As these figures show,
the magnetic circuit can be visualized in addition to separating the torque
values. Therefore, the influence of each excitation force on the torque
can be examined. |
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