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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

 

From: elec-trak-bounces cosmos phy tufts edu [mailto:elec-trak-bounces cosmos phy tufts edu] On Behalf Of Jeff Tickner
Sent: Thursday, January 03, 2008 9:46 AM
To: Elec-trak cosmos phy tufts edu
Subject: Re: (ET) E20 motor at 48V


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