Re: QEP encoder

Jack Klein wrote:

...

There are two main varieties of this type of 3 phase motor.

If they are wound so that the back EMF is sinusoidal, they are called
BLDC, brushless DC motors.

If they are wound so that the back EMF is trapezoidal, they are called
PMSM, Permanent Magnet Synchronous Motors.

Sinusoidal windings can be driven with lower torque ripple,

But only is driven with (possibly PWM) sinusoids?

and sensing the back EMF can provide feedback, in lieu of a hall
effect commutator, rather like a resolver.

Trapezoidal windings tend to be somewhat cheaper if all other features
of the motor are the same, depending on the manufacturer.

And probably have higher drop-out torque. Thanks for the update.

Jerry
--
Engineering is the art of making what you want from things you can get.
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