Hi.
The treadmill typical motors are about 160 VDC, 2HP Can those run on AC ?


Motors with commutator and brushes that have permanent magnets are DC only, right ?

Are automobile starter motors with stator windings without permanent magnets universal ? Can run on AC ?

 

DC-Only.
.
.
.

 

The DC TM motors require the DC controller,
As do commutator motors with magnetic fields do.
The older version of automobile starter that had a series wound field could possibly run on AC but never tried it.
Similar to Universal motors in appliances.
There are now 3 phase AC sine wave fed motors that have PM rotors that are electronically commutated, not to be confused with the identical BLDC motor that is just commutated differently..

 

Thanks.

The DC TM motors require the DC controller,

Why? I have made them run on D.C. from batteries, with no controllers.

 

Why? I have made them run on D.C. from batteries, with no controllers.

I assumed you wanted RPM control!

 

Any commutated motor with a permanent magnet runs on DC only. A true universal motor does not have a perm. mag., rather, they have field and rotor windings. When the AC is on one side of the sine wave the field produces a magnetic field opposite of the rotor winding. When the AC switches to the other side then it all swaps position and the motor continues to run, and it always runs in one direction only. A treadmill motor can be reversed if you reverse the positive and negative wires.

And if you're curious about those blue wires (all I've ever seen have been blue), they have a thermal switch inside the motor. If it overheats the thermal switch opens up and shuts down the motor until it cools sufficiently.

 

Any commutated motor with a permanent magnet runs on DC only. A true universal motor does not have a perm. mag., rather, they have field and rotor windings. When the AC is on one side of the sine wave the field produces a magnetic field opposite of the rotor winding. When the AC switches to the other side then it all swaps position and the motor continues to run, and it always runs in one direction only. A treadmill motor can be reversed if you reverse the positive and negative wires.

A 3ph AC synchronous motor with PM rotor also possesses commutation, albeit electronic.
The Universal motor works because it is a Series-wound-field motor, so the field current switches in sync with the armature. current. i.e. retains the same relative polarity.
It does not work with a shunt wound-field DC motor.

 

A 3ph AC synchronous motor with PM rotor also possesses commutation, albeit electronic.
The Universal motor works because it is a Series-wound-field motor, so the field current switches in sync with the armature. current. i.e. retains the same relative polarity.
It does not work with a shunt wound-field DC motor.

You explain it better. Thanks.