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| | Teknic | Sinewave Commutation |
 | | Physically, what is occurring when the currents in the motor are forced to be sinusoidal (as defined above), is that the magnetic vector created by the stator is held at ninety degrees to the magnetic vector of the rotor. |
 | | Unfortunately, sinewave commutation alone has no method of enforcing that this magnetic angle will be maintained under dynamic conditions (when the motor is moving, accelerating, braking, etc.). |
 | | When the motor rotates sixty electrical degrees, based upon the rather crude physical positioning of Hall-effect commutation sensors, the phases are abruptly switched (i.e., current is then forced into the second phase and removed from the third, while the second phase connection is abruptly disconnected). |
| www.teknic.com /systems/sinewave_commutation.php (1036 words) |
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