On Feb 3, 2006, at 3:20 AM, David Brown wrote:
Permanent Magnet Synchronous Motor. The connections and windings are
similar to that of a BLDC, but optomised for running with three sin
waves at
120 degree phase differences rather than BLDC trapezoid patterns.
Some
motors are happy with either type of driving patterns. BLDC
patterns are
much easier to generate, while PMSM patterns give finer control (for
example, you can lock the motor at a precise angle) and minimal
current
ripple, but you need a much more powerful controller, and accurate
angle
feedback (not just a hall-effect controller).
Gotcha.
So, I know you can drive a BLDC with a sinusoidal wave form, as well,
but I don't know if you need accurate angle sensing to do it.
Even in the PMSM, do you really need 6 PWMs? Aren't three enough,
because you only need to switch one of the two MOSFETs in each half
bridge, the other can just be "on"?
--
Rick
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