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Forum: Brushed/Brushless motors, speed controls, gear drives

10-20-2007, 03:26 PM

Replies: 19

Brushless Motor Theorem

Views: 9,061

Posted By DarZeelon

RE: Brushless Motor Theorem

Yes Dave,

I am over-simplifying things.

I still do not know how kV is calculated, but I believe it is of lesser importance to the understanding of how to properly set-up a brush-less...

Forum: Brushed/Brushless motors, speed controls, gear drives

10-20-2007, 01:47 AM

Replies: 19

Brushless Motor Theorem

Views: 9,061

Posted By DarZeelon

RE: Brushless Motor Theorem

Dave, Pete,

Let us take the simpler model of the 'star' type brush-less motor, with 12 electromagnetic poles.
Let's also use my table from post #9.

There are three groups of windings;...

Forum: Brushed/Brushless motors, speed controls, gear drives

10-19-2007, 05:57 PM

Replies: 19

Brushless Motor Theorem

Views: 9,061

Posted By DarZeelon

RE: Brushless Motor Theorem

Dave,

With a square wave ESC, which as far as I know applies to all current BL ESCs, there definitely is 0V!
It lasts for 60Âº, is followed by 120Âº of full positive voltage and then...

Forum: Brushed/Brushless motors, speed controls, gear drives

10-19-2007, 01:44 PM

Replies: 19

Brushless Motor Theorem

Views: 9,061

Posted By DarZeelon

RE: Brushless Motor Theorem

Dave,

In 'normal household' 3-phase systems, the waves are sinusoidal, at 120Âº intervals, since they are produced by an alternator type generator.

Producing 3-phase current using a wave...

Forum: Brushed/Brushless motors, speed controls, gear drives

10-19-2007, 12:48 AM

Replies: 19

Brushless Motor Theorem

Views: 9,061

Posted By DarZeelon

RE: Brushless Motor Theorem

Dave,

A true 3-phase power system does not have 'square' waves, as does the voltage supplied by a brush-less ESC.

Voltage from the ESC always has one phase at +V, the second at -V and...

Forum: Brushed/Brushless motors, speed controls, gear drives

10-18-2007, 05:39 PM

Replies: 19

Brushless Motor Theorem

Views: 9,061

Posted By DarZeelon

Brushless Motor Theorem

I am brand new to this.

A brush-less motor, being a 3-phase AC motor, is theoretically a one-speed motor.

I.e. it must spin at an RPM that will bring its individual magnet poles in-line...

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