DC motor problem
DC motor problem
(OP)
I have a DC motor that has a problem. When a battery is applied to the motor the battery arcs and sparks. Attached is a rough schematic of the motor.
Things I have checked:
1. field is not grounded to case
2. commutator is not grounded to the armature shaft.
3. each pole has continuity to other poles
4. armature turns freely
5. field coils are new and not shorted
I am stumped
Things I have checked:
1. field is not grounded to case
2. commutator is not grounded to the armature shaft.
3. each pole has continuity to other poles
4. armature turns freely
5. field coils are new and not shorted
I am stumped





RE: DC motor problem
RE: DC motor problem
RE: DC motor problem
RE: DC motor problem
RE: DC motor problem
What size is the motor and what size is the battery?
Are you using a switch or just holding the cable on the battery terminal?
Bill
--------------------
"Why not the best?"
Jimmy Carter
RE: DC motor problem
RE: DC motor problem
RE: DC motor problem
New. It is possible that the coil's polarity is wrong (one of them) then you will not have much torque, but lots of current.
Try change polarity of ONE of the coils. If motor runs, but wrong direction, then change coil back and change other coil.
Do not use a multimeter to measure these low ohm windings. All you get is probably the probe cable's resistance.
Gunnar Englund
www.gke.org
--------------------------------------
Half full - Half empty? I don't mind. It's what in it that counts.
RE: DC motor problem
Bill
--------------------
"Why not the best?"
Jimmy Carter
RE: DC motor problem
RE: DC motor problem
RE: DC motor problem
So called universal motors can run on DC or AC, but if this is a starter motor, there is usually no laminated iron in the stator and that doesn't work very well with AC. But give it a shot. Use rated RMS voltage. You seem to be adventurous, so why not?
Gunnar Englund
www.gke.org
--------------------------------------
Half full - Half empty? I don't mind. It's what in it that counts.
RE: DC motor problem
Bill
--------------------
"Why not the best?"
Jimmy Carter