[DeTomaso] Heater blower motor (3 speed specifically)

[Tomas Gunnarsson]

Thanks Bill, this is just what I expected. It's the same thing that happened with my wiper motor.

Tomas
  ----- Original Message ----- 
  From: SOBill at aol.com 
  To: guson at home.se ; detomaso at realbig.com 
  Sent: Tuesday, July 14, 2009 5:53 PM
  Subject: Re: [DeTomaso] Heater blower motor (3 speed specifically)


  Tomas,

  You should not connect power to more than one motor winding at a time.

  These are permanent magnet motors with motor and the field windings are in series. Which field winding is receives power controls the field strength and thus the speed of the motor.

  As the motor rotates, it induces voltages in all the field windings. If power is applied to more than one field winding the voltage induced by the motors rotation will see a short circuit across one of the windings and will definitely overheat that winding.

  Have fun,

  SOBill Taylor
  sobill at aol.com 


   


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