METHOD FOR REPEATEDLY CHANGING NOMINAL POWER OF FREQUENCY-REGULATED ELECTRIC MOTOR AND ELECTRIC MOTOR FOR REALIZATION OF THE METHOD Russian patent published in 2008 - IPC H02P25/18 H02P27/04 

FIELD: electric engineering, namely, electric machines, may be used in devices which operate in short term or repeated short term mode, and also in devices, working cycle of which includes both long term and short term modes of operation.

SUBSTANCE: in the method and electric motor, repeated changing of nominal power of frequency-regulated electric motor is realized by alternating number of coils of electric motor phase. Nominal frequency of voltage is changed in such a way that result of multiplication of number of phase coils and nominal frequency of voltage remains unchanged. To ensure alternation of phase coil number the anchor winding of electric motor is made divided into sections with equal number of coils with their possible connection in either serial, or parallel, or serial-parallel fashion depending on the mode of operation. As a result of that, acceptable power of electric motor is increased approximately ten times when it operates in short term mode. It is possible to select base electric motor of substantially lesser size type compared to existing recommendations, laboriousness and costs of manufacturing are reduced with usage of base electric motor units. Inventions may be realized when a short term increase of power is required or when it is needed to ensure large dynamic momentum, in particular, for moving large inertial masses, or at the end of their movement for closing some sort of limiter, or in electric starters with limited dimensions and mass.

EFFECT: increased efficiency.

2 cl, 1 dwg