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Patent Searching and Data


Title:
SURGE SUPPRESSOR
Document Type and Number:
WIPO Patent Application WO/1999/045629
Kind Code:
A1
Abstract:
A surge suppressor completely suppresses surge voltage only by adding a simple damper circuit and thus elongates the duration of the insulation of an AC motor driven by a PWM inverter through a relatively long cable. The surge suppressor comprises a power supply for supplying AC power subjected to pulse width modulation by an inverter, an AC motor driven by AC power from the power supply through a long cable, and a damper circuit that includes either a series circuit of a resistor and a capacitor connected between the input terminals of the electric motor or a parallel circuit of a resistor and an inductor connected between the output terminals of the power supply. The circuit constants of the damper circuit are determined according to the inductance and stray capacitance of the cable so that surge can be absorbed.

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Inventors:
Aoki, Noboru (Ebara Corporation 11-1, Haneda Asahi-cho Ohta-ku, Tokyo, 144-8510, JP)
Satoh, Kenichi (Ebara Corporation 11-1, Haneda Asahi-cho Ohta-ku, Tokyo, 144-8510, JP)
Nabae, Akira (NPE Research Laboratory 18-10, Nishishiba 4-chome Kanazawa-ku Yokohama-shi, Kanagawa, 236-0017, JP)
Application Number:
PCT/JP1999/001077
Publication Date:
September 10, 1999
Filing Date:
March 05, 1999
Export Citation:
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Assignee:
EBARA CORPORATION (11-1, Haneda Asahi-cho Ohta-ku, Tokyo, 144-8510, JP)
Aoki, Noboru (Ebara Corporation 11-1, Haneda Asahi-cho Ohta-ku, Tokyo, 144-8510, JP)
Satoh, Kenichi (Ebara Corporation 11-1, Haneda Asahi-cho Ohta-ku, Tokyo, 144-8510, JP)
Nabae, Akira (NPE Research Laboratory 18-10, Nishishiba 4-chome Kanazawa-ku Yokohama-shi, Kanagawa, 236-0017, JP)
International Classes:
H02M1/12; H02P29/00; (IPC1-7): H02M1/12
Foreign References:
JPH07337033A1995-12-22
JPS6355742U1988-04-14
JPH01105397U1989-07-17
JPH0386021A1991-04-11
JPH0345091U1991-04-25
Attorney, Agent or Firm:
Watanabe, Isamu (GOWA Nishi-Shinjuku, 4F 5-8 Nishi-Shinjuku 7-chome Shinjuku-ku, Tokyo, 160-0023, JP)
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