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Pump with speed controller responsive to temperature

  • US 5,158,436 A
  • Filed: 03/12/1991
  • Issued: 10/27/1992
  • Est. Priority Date: 03/29/1990
  • Status: Expired due to Fees
First Claim
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1. Pump unit, in lar for heating and cooling installations, the speed of which can be altered by changing the operating frequency of a frequency converter feeding the electric motor, and having a device which protects the unit from thermal overload, the pump unit and frequency converter forming a structural unit, characterised in that when a parameter characterising the overload state is reached, the motor speed n is reduced to a motor speed n'"'"' by driving the frequency converter, wherein the relationship n'"'"'≧

  • 0.5 n applies.

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