By Hendertshot, J. R., Miller, T. J. E.
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Additional resources for Design of Brushless Permanent Magnet Motors
When a power transistor is "off1 the voltage across it may be high, so even a small leakage current can generate significant losses. 3. High forward-blocking capability—the forward blocking capability should be higher than the supply voltage by a safety margin that depends on the types of transients that are expected. Typically the "rated" voltage of devices is at least 30% above the supply voltage, but larger margins may be necessary to accommodate adverse conditions such as overvoltage on the supply, or high temperature.
They are sometimes called "muffin" fans and are manufactured in very large numbers. The smallest are less than 1 in. in diameter. Very long life is required in many of these designs. Fig. 7 shows another example of an exterior-rotor motor used in blowers such as the furnace in home heating applications. The manufacturer of this motor also makes exterior-rotor induction motors for fan and blower applications. It was natural for them to develop a similar exterior-rotor brushless machine for improved quietness and efficiency.
A typical resolution used in motor drives is 1000 lines/rev. 1-21 D e s ig n o f b r u sh l e s s pe r m a n e n t -m a g n e t m o t o r s Optical encoders mount on the motor in a similar way to the resolver, and versions are available with or without their own bearings and housings. The direct production of pulses makes the optical encoder attractive for interfacing to digital commutation circuitry. However, there are practical limitations. The encoder cannot operate at such high temperatures as the resolver, and it is not as rugged.