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Unread 06-04-2015, 01:57 PM   #1
Gone Wild
Join Date: Mar 2008
Location: FL
Posts: 199
Default Motor connections

SO, I got a used motor for my cart but the connections are marked different than my original. The new motor, on the right is marked as in the diagram. Can anybody shed some light on this.

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Unread 06-04-2015, 02:16 PM   #2
rib33024's Avatar
Join Date: Apr 2009
Location: FT Lauderdale FL.
Posts: 13,613
Default Re: Motor connections

Can you show some pics of the other end of the motors and the windings . There should be markings stamped in the case. wire wheel it and you may see them. The motor on right looks like it might be a sepex motor. and the one on the left is a series? If so the new motor will not work in your series cart. Two different motors. if the markings in the second pic is on your new motor it will not work
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Unread 06-04-2015, 02:46 PM   #3
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Default Re: Motor connections

Shunt motor
. The field coil and the armature windings are connected in shunt
or parallel across the
power source. The armature winding consists of relatively few turns of heavy gauge wire. The
voltage across two windings is the same but the armature draws considerably more current than the
field coil. Torque is caused by the interaction of the current caring armature winding with the
magnetic field produced by the field
coil. If the DC line
voltage is constant, the armature voltage
and the field strength will be constant. The speed
regulation is quite good; the speed is a function of
armature current and is not precisely constant. As
the armature rotates within the magnetic field, an
EMF is induced in its wining. This EMF is in the
direction opposite to the
source EMF and is called
the counter EMF (CEMF), which varies with rotational
speed. Finally, the current flow through the
armature winding is a result of the difference between source EMF and CEMF. When the load
increases, the motor tends to slow down and less
CEMF is induced, which in turn increases the
armature current providing more
torque for the increased load.


The power difference between the motor input and the output is dissipated in form of heat and
constitutes to the losses of the machine. These losses increase with
load, since the motor heats up as
it delivers mechanical power.

Series motor.
The field coil and armature windings are connected in series to the power source. The
field coil is wound with a few turn
s of heavy gauge wire. In this motor, the magnetic field is
produced by the current flowing through the armature winding; with
the result that the
magnetic field is weak when the motor load
is light (the armature winding draws a
minimum current). The magnetic field is strong when the load is heavy (the armature
winding draws a maximum current). The armature
voltage is nearly equal to the PS line
voltage (just as in the shunt wound motor if we
neglect the small drop in the series field).
the speed of the series wound motor
is entirely determined by the load
The speed is low at heavy loads, and very
high at no load. In fact, many series
motors will, if operated at no load, run so
fast that they destroy themselves. The high
forces, associated with high speeds, cause the
rotor to fly apart, often with disastrous
results to people and property nearby. The
torque of any DC motor depends upon the
product of the armature current and the magnetic field. For the series wound motor this
relationship implies that the torque will be very large for high armature currents, such as
occur during start-up. The series wound motor
is, therefore, well adapted to start large
heavy-inertia loads, and is particularly useful
as a drive motor in electric buses, trains and
heavy duty traction applications
. Compared to the shunt motor, the series DC motor has
high starting torque and
poor speed regulation
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