help with castle motors

[sidehiller]

3 wires but not sensored?

is white a common ground and red/black power wires for forward/reverse?

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[The Violator]

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A brushless motor is "inside out" compared to your GWS motor. The windings are glued to the inside of the can, and the permanent magnets are bonded to the rotor. Since the wires don't move, you don't need brushes to transfer the electricity.

Take a look at the commutator on the GWS motor. It's cut into multiple sections. Depending on which two sections are in contact with the brushes at any given time, different sections of the windings are energized, creating the magnetic fields that push and/or pull against the fixed magnets in the can.

There are three wires coming from a brushless motor. Inside, all three wires are connected, and wound such that passing DC current through any two connections will create a magnetic field, making the rotor turn a partial revolution The computerized electronic speed control "commutates" a brushless motor by switching which two wires are being energized in a sequence.

Sensored and sensorless are two types of brushless motors. Sensored motors have a separate sensor, and an additional five wires, that tells the controller which direction and how fast the motor is turning. These are more complicated, more expensive, and difficult to reverse. They've pretty much gone the way of the dodo in R/C; only MaxCim still makes sensored brushless motors. SensorLESS motors use the fact that when a motor is coasting, it's generating electricity to see which direction and how fast the motor is turning. Knowing this information is crucial to making the motor turn in the correct direction, and knowing which two wires to pass current through at any given time to keep it turning in that direction.

[Olle P]

To give you a shorter and more direct answer:
- Those motors are brushless.
- The ESCs for brushless motors switch the current running through the three leads to have it run in the correct direction at the right time.

If you were to study the current passing through any one of those leads while the motor is running you'd see it's constantly alternating.

[tocsin]

Originally Posted by The Violator

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Sensored motors have a separate sensor, and an additional five wires, that tells the controller which direction and how fast the motor is turning. These are more complicated, more expensive, and difficult to reverse. They've pretty much gone the way of the dodo in R/C; only MaxCim still makes sensored brushless motors.

That's like saying Betamax will be the new standard Must have been a very old post. Good write up on brushless theory though.

To sidehiller's question... with a sensorless motor, it doesn't matter. They are phase A, B, and C. You can't hurt it by hooking it up incorrectly. If it is spinning in the wrong direction, swap any two motor wires.

Note that this only applies to sensorless motors. With a sensored motor, the sensors tell the ESC where the rotor is at so the ESC knows which phase to fire, i.e. phase B first, then C, then A... etc. If the motor and ESC wires don't line up with a sensored motor, it'll be like having a severely slipped timing belt in your car.

[sidehiller]

ah I see now :thumbup:

thanks for education lesson.

Sent from my GT-I9100M