The ME0193 is a permanent magnet brushless DC motor (often just abbreviated to BLDC). It uses a trapezoidal three phase drive from a controller that generates this waveform from the DC battery supply. Because the motor provides absolute rotor position feedback (using Hall sensors) to the controller, you need a separate controller for each motor, as the chances of getting a couple of motors to remain mechanically synced to the accuracy required to allow them to run from a single controller is pretty slim.
The controllers are pretty simple things, just some electronics that generates the three phase switched waveform from the sensor position feedback signals and a pulse width modulated part that in essence is the same principle as that used on a brushed motor for power control, except it pulse width modulates all three phase outputs.
I've designed and built fairly high power BLDC controllers and they can be pretty simple if lots of fancy features aren't required. They can also get to be pretty complex if all these fancy features, like user-programmability etc, are required!
I've seen it mentioned that these motors need sinusoidal drive. This isn't the case, although they will run more quietly and very slightly (only maybe 1%) more efficiently with a sinusoidal three phase drive. However, sinusoidal drive controllers are both pretty rare and rather expensive, so most folks stick with straight trapezoidal switched controllers, like those from Sevcon, Kelly etc.
Jeremy
--- In electricboats@yahoogroups.com, Michael Mccomb <mccomb.michael@...> wrote:
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do you know, does a motor such as a ME0913 require an individual controller due to some sort of frequency feedback that the motor must supply?
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