Speed calculation device and power conversion device

Number of patents in Portfolio can not be more than 2000

United States of America Patent

PATENT NO 11870384
APP PUB NO 20210075347A1
SERIAL NO

16644207

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ATTORNEY / AGENT: (SPONSORED)

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Abstract

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The purpose of the present invention is to provide a speed detection method for maintaining a fine time axis resolution and a power conversion device that uses the method. This power conversion device comprises an inverter for converting DC voltage into AC voltage and supplying the same to a motor, a motor speed calculation unit for calculating the speed of the motor from output pulses obtained from an encoder connected to the motor, and a control unit for receiving the motor speed from the motor speed calculation unit and controlling the inverter. In the power conversion device, the motor speed calculation unit measures the duty cycle of the output pulses, calculates the speed using the half cycles of the output pulses if the duty cycle is within a prescribed range from 50%, and calculates the speed using the full cycles of the output pulses if the duty ratio is outside of the prescribed range from 50%.

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Patent Owner(s)

Patent OwnerAddress
HITACHI INDUSTRIAL EQUIPMENT SYSTEMS CO LTDTOKYO

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Inventor(s)

Inventor Name Address # of filed Patents Total Citations
Arao, Yusuke Tokyo, JP 10 10
Hiraga, Masahiro Tokyo, JP 25 231
Hotta, Kazushige Tokyo, JP 38 307
Nakamura, Atsuhiko Tokyo, JP 10 66
Onuma, Yusaku Tokyo, JP 13 11
Sasaki, Masataka Tokyo, JP 26 402
Tomita, Hiroyuki Tokyo, JP 126 1009
Watanabe, Hiroshi Tokyo, JP 915 12785

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