By Hendertshot, J. R., Miller, T. J. E.
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Additional resources for Design of Brushless Permanent Magnet Motors
Fig. 11 Typical continuous and short-time operating regions Fig. 11 shows the typical continuous and short-time operating regions of a brushless DC motor. The speed/torque curve defines the operating limits of the motor and its controller. It does not follow that the motor always operates at a point on the speed/torque curve. In fact, the speed and torque of most brushless DC motors is continually varying. On average over a long time period, the operating point must must remain within the continuous operating range.
It does not follow that the motor always operates at a point on the speed/torque curve. In fact, the speed and torque of most brushless DC motors is continually varying. On average over a long time period, the operating point must must remain within the continuous operating range. But excursions into the short-time range are permitted, and these may be as frequent as necessitated by the load, provided that the accumulated heating effect does not cause the 1-16 1. G e n er a l I n t r o d u c t io n motor temperature rise to exceed the short-term rated value.
5 shows the cross-section of a typical motor of this type. The stack of laminations used for the stator looks very similar to the stack of laminations on a DC brush-type motor armature. This type of stator is simple to wind using DC-motor fly-winding machines. Some designs are produced on winding machines that wind all three phases simultaneously. The rotor consists of a cup made of soft iron mounted on the shaft with magnet arcs or a molded or bonded ring magnet fixed inside the steel rotor cup with epoxy or Loctite®.