Appeal No. 1996-1427
Application 08/029,028
Representative independent apparatus claim 1 is reproduced below:
1. An anti-clipping circuit for a polyphase electric motor driven by a polyphase inverter
with the polyphase inverter receiving electrical power from a power supply and generating motor drive
signals phase currents that are a function of a rotor frequency and a slip frequency, said anti-clipping
circuit comprising:
first sensing means for sensing an electromotive force of the motor;
second sensing means for sensing a voltage of the power supply;
comparison means coupled to the first and second means for comparing the electromotive force
of the motor with the power supply voltage and producing a comparison output that varies as a function
of a difference between the electromotive force of the motor and the power supply voltage; and
slip correction means for adjusting the slip frequency as a function of the comparison output to
progressively increase the slip frequency as the electromotive force of the motor approaches the power
supply voltage.
Representative independent method claim 6 is reproduced below:
6. A method of controlling a polyphase electric motor of the type that receives motor drive
signals phase currents from a polyphase inverter, said polyphase inverter receiving electrical power
from a power supply and generating the motor drive signals phase currents as a function of a rotor
frequency and a slip frequency, said method comprising the steps of:
sensing an electromotive force of the motor;
sensing a voltage of the power supply;
comparing the electromotive force of the motor with the power supply voltage and generating a
comparison output that varies as a function of a difference between the electromotive force of the motor
and the power supply voltage; and
3
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