Power converting apparatus

Details Power converting apparatus Power converting apparatus

2007-07-26

2011-10-04

Ro, Bentsu (Department: 2837)

Electricity: motive power systems

Positional servo systems

Pulse-width modulated power input to motor

C318S448000, C318S629000

Reexamination Certificate

active

08030874

ABSTRACT:
To reduce, in a power converting apparatus for an electric locomotive, a sixth-order harmonic noise induced by a torque ripple component equivalent to a sixth-order frequency of an inverter frequency. When a motor is driven in a three-pulse mode to drive the electric locomotive, three pulses included within a ½ cycle of the inverter frequency in a PWM waveform, which is used for controlling a switching element of an inverter unit that drives the motor, are set to satisfy Tq≧T/8, Tp≦Tq/2, and Tr≦Tq/2 where, assuming that the three pulses include a first pulse, a second pulse, and a third pulse from an order of generation, Tp is a pulse width of the first pulse, Tq is ½ of a pulse width (full width at half maximum of a pulse) of the second pulse, Tr is a pulse width of the third pulse, and T is a cycle of the inverter frequency.

REFERENCES:
patent: 3916285 (1975-10-01), Iwata et al.
patent: 4635177 (1987-01-01), Shekhawat et al.
patent: 05-130792 (1993-05-01), None
patent: 06-253546 (1994-09-01), None
Hideki Iida et al., “Instruction to inverter-controlled electric locomotive,” Denkisyakenkyukai, 2003, printed in Japan (translation of article).
PCT/ISA/210 (in Japanese).
PCT/ISA/237 (in Japanese).

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