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| Number | Title | Issue Date |
| 7663337 | Frequency converter, motor, motor drive system and maintenance method for motor drive system A frequency converter for outputting a power to drive a motor, having: an inverter unit for inverting a d.c. power to an a.c. power; a control unit for controlling the inverter unit; and a housing for supporting at least the inverter unit and control unit, wherein a... | 02/16/2010 |
| 7515422 | Electric power converter The present invention provides an electric power converter in which a tip portion of a cooling fin on an air flow inlet side is limited to flow a large quantity of air around a connection portion, where the fin efficiency is high, of a base surface of the cooling fi... | 04/07/2009 |
| 7473084 | Oil-cooled screw compressor In an oil-cooled screw compressor comprising, a compressor body including a pair of a male rotor and a female rotor, a motor including a stator and a motor rotor connected to one of the male and female rotors, and an oil separator container for gathering the oil fro... | 01/06/2009 |
