Dual duty drive with induction motor
OwnerVoldemar Voldemarovich Apsit, Alexei Petrovich Ustinsky +2inventors
InventorsVoldemar Voldemarovich Apsit, Alexei Petrovich Ustinsky, Vladislav Alexandrovich Pugachev, Mikhail Maiorovich Usachev
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Abstract
A dual duty drive for an actuating mechanism, for example a pump or a fan, incorporating an induction motor and an electromechanical reduction gear unit. The economical and reliable operation in the rated duty is ensured by delta connecting the motor windings, and with current being applied across the field winding of the electro-mechanical reduction gear unit, the latter is caused to operate with a gear ratio close to unity. Under a fractional load duty, the motor windings are star connected and the electro-mechanical reduction gear unit is deenergized, causing the latter to operate in the step-down reduction mode.
Claims3
A dual duty drive with an induction motor having a means for switching the windings there of from star to delta connection and vice versa, also comprising a reduction gear unit disposed at the output of said induction motor and intended for transmitting power to a controlled actuating mechanism, said reduction gear unit being adapted to operate both with a present step-down gear ratio and with a gear ratio equal to or approaching unity;
- a control means, operatively connected to said means for switching the windings of the induction motor and to said reduction gear unit, said control means having different operating positions, whereby in one position the windings of the induction motor are star connected and the reduction gear unit is caused to operate with a step-down gear ratio, whereas in the other position the induction motor windings are delta connected and the reduction gear unit is shifted to operate with a gear ratio equal to or approaching unity.
Dependencies are inferred from the claim text.