Electricity: motive power systems – Induction motor systems – Primary circuit control
Reexamination Certificate
2007-12-04
2007-12-04
Masih, Karen (Department: 2837)
Electricity: motive power systems
Induction motor systems
Primary circuit control
C318S254100, C318S132000, C318S434000, C318S432000, C318S433000, C318S434000
Reexamination Certificate
active
11372216
ABSTRACT:
A motor control device for controlling a permanent magnet motor includes a current detector detecting current flowing through three-phase windings, an induced voltage computing unit obtaining voltage induced at each phase from the detected three-phase winding current based on a phase voltage equation, a position detector detecting a rotational position of the rotor from the induced voltage of each phase computed by the induced current computing unit, the rotational position of the rotor having a 6n resolution where n is an integer equal to or larger than 1, an energization phase control unit determining a phase to be energized based on the rotational position of the rotor and a phase command, an energization signal forming unit forming a 6n-resolution three-phase energization signal, and an energizing unit carrying out PWM modulation for the three-phase energization signal, supplying voltage according to the modulated three-phase energization signal to each of the three-phase windings.
REFERENCES:
patent: 2005/0275362 (2005-12-01), Yamamoto et al.
patent: 2006/0001392 (2006-01-01), Ajima et al.
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Nagai Kazunobu
Oka Hiromi
Sekihara Toshikazu
Shinohara Tsuyoshi
Masih Karen
Pillsbury Winthrop Shaw & Pittman LLP
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