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Re: (ET) E20 motor at 48V
With a transmission using variable ratios, a shunt
motor is ideal as it can run higher speeds and offer field weakening which
utilizes a smaller motor.
Typical "Cushman" type vehicles use series motors
and no variable transmission so a series motor provides more low end torque for
starting which decreases as you speed up.
For Volkswagens, GE used to make an adapter
plate that bolted to the tranny and a small compound motor was used with
success.
Remember, a snowblower has no tranny, requires lots of
torque at low speed and less load lets it recover to higher speed in that
application.
To confuse you more, motors are designed
for:
Constant Torque applications where load stays
the same with speed - conveyor, kiln
- vary armature volts,
constant current, no field weakening (run zero to base speed)
Constant Horsepower applications where
load changes with speed - coilers, metal working machines
- constant armature volts,
field weakening (run base to top speed)
So, depending upon what is coupled to the motor and load
determines the best type of motor.
The snowblower motor is rated 2.5HP at 3100RPM so it has
more torque.
Stepping motor voltage is not a problem if you have good
contactors.
...Walt
For an onroad EV I would think a
snowblower motor would be a better choice then an E20 motor. Isn't it more
powerful then the drive motor?
Of
course you have to have an extra snowblower motor laying around.
Jeff Tickner
Senior Support
Engineer
603-924-8818, Ext 536
SoftLanding Systems
a subsidiary of
Unicom