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Re: (ET) E-12 Traction motor PM?
The E12HA has a compound wound motor, not permanent magnet (it is the
E12JA that has the perm. mag. motor).
The two big studs are indeed the armature.
The group of 4 small wires (connector P6) is as follows:
Pins 1 and 2: Field winding
Pins 3 and 4: Thermal switch inside motor (ie CB-1)*
The two small wires at the end are for the internal centrifugal switch.
You may be able to use a PM type controller to drive the armature if you
provide a separate circuit to drive the field. Or use the Alltrax
controller that is designed to drive the field directly. When rewiring,
use an ohmmeter to make sure you identify the field correctly (low
resistance) versus the thermal switch (0 ohms).
*Many of the Elec-Traks use a large "hockey puck" breaker mounted on the
outside of the drive motor, which interrupts the high-power circuit when
tripped. Some models, such as the E12, use a small thermal switch inside
the motor as a circuit breaker to interrupt the low-power control circuits.
Jim Coate
*The Electric Tractor Store*
http://www.ElectricTractorStore.com
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Bill Alburty wrote:
I'd like to verify that my E-12 has a permanent magnet type traction
motor. The manual says it does on page 7-4. My motor has only two big
studs with big wires which apparently are the armature connections.
But what are those smaller wires? There are two #16 wires going into
the can on the end, and four #16 wires going into a hole in the motor
housing. I can't follow where these wires come from because they go
behind the motor mounting bracket. My E-12 frame M/N is 26AE12HA and
S/N FRO2 594. The motor is GE M/N 5BCE56KB5B date code BHN.
I want to install a Pulse Width Modulation speed control and I
understand they work only on PM motors. I'd like verification of that
fact also. Any information will be greatly appreciated.
Bill Alburty
Leawood, Kansas
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