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

10-20-2007, 06:25 PM

Replies: 19

Brushless Motor Theorem

Views: 9,061

Posted By DaveFlynn

RE: Brushless Motor Theorem

Dar,

The Hacker out-runners like A20, A30 ans A50 have 12 coils and 14 magnets. These are good motors, I have them. I don't know about the A100/A150/A200. There should always be an even number...

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

10-20-2007, 01:41 PM

Replies: 19

Brushless Motor Theorem

Views: 9,061

Posted By DaveFlynn

RE: Brushless Motor Theorem

Dar,

What you're saying is correct, but overly simplified. Things to look at: How long after voltage is applied to the coils does current begin to flow (convert to uH)? How many volts (RMS) are...

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

10-19-2007, 08:10 PM

Replies: 19

Brushless Motor Theorem

Views: 9,061

Posted By DaveFlynn

RE: Brushless Motor Theorem

Pete,

Correct it's not an induction motor so I did have to spin is by hand to get it going. I was running a motor on about 5 volts and 2 amps from a 3-phase variac. I was looking for an easy...

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

10-19-2007, 06:40 PM

Replies: 19

Brushless Motor Theorem

Views: 9,061

Posted By DaveFlynn

RE: Brushless Motor Theorem

Dar,

Did you know that you can drive these DC motors with 60Hz 3-Phase, they will turn 3600, 1800 or 1200 RPM depending on how many windings they have? They are DC because an AC ESC would weigh...

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

10-19-2007, 04:52 PM

Replies: 19

Brushless Motor Theorem

Views: 9,061

Posted By DaveFlynn

RE: Brushless Motor Theorem

Dar,

I think you are mixing AC and DC motors. Either way the input to the motor is the same. BTW, the third wire is not 0 it's floating and follows part of a sine curve from +BEFM to -BEMF or...

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

10-19-2007, 11:21 AM

Replies: 19

Brushless Motor Theorem

Views: 9,061

Posted By DaveFlynn

RE: Brushless Motor Theorem

Dar,

It's not square waves, it's PWM. The drive electronics (3-phase H switch) and motor (delta or wye wound) are the same for a 3-phase system.

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

10-18-2007, 06:37 PM

Replies: 19

Brushless Motor Theorem

Views: 9,061

Posted By DaveFlynn

RE: Brushless Motor Theorem

First they run 2 phase, in other words one of the wires is not driven and used to sense position for commutation.
You can drive a 50A motor with a 30A ESC or at 30A with the 50A ESC, but you'd have...

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