Method of rapidly starting an asynchronous motor
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United States of America Patent
Stats
-
Oct 21, 2003
Grant Date -
Jul 18, 2002
app pub date -
Jan 16, 2002
filing date -
Jan 18, 2001
priority date (Note) -
Expired
status (Latency Note)
Importance
Abstract
In order to accelerate an asynchronous motor with a squirrel-cage rotor even under load extremely quickly, and in particular within the time of an electromagnetic rotor time constant, in order to be able to cause it to start with a so-called kick start, while the rotor is not moving, quasi-stationary magnetic conditions are initially produced, like at the start of a synchronous motor with a permanent-magnetic rotor. For that purpose there is briefly produced a high-frequency rotor induction current which occurs electrically and spatially in a quasi-stationary condition when thereupon still within the rotor time constant, a strong unmoving stator magnetic field is produced, with a stator current vector which is displaced through about 90.degree. for an optimum starting torque in relation to the rotor current vector, whereupon the stator rotary field starts with increasing amplitude and frequency.
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