Title:
電力変換装置
Document Type and Number:
Japanese Patent JP7153767
Kind Code:
B2
Abstract:
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%.
Inventors:
Hiroshi Watanabe
Masaki Sasaki
Masahiro Hiraga
Yusuke Arao
Atsuhiko Nakamura
Hiroyuki Tomita
Kazushige Hotta
Yusaku Onuma
Masaki Sasaki
Masahiro Hiraga
Yusuke Arao
Atsuhiko Nakamura
Hiroyuki Tomita
Kazushige Hotta
Yusaku Onuma
Application Number:
JP2021095139A
Publication Date:
October 14, 2022
Filing Date:
June 07, 2021
Export Citation:
Assignee:
Hitachi Industrial Equipment Systems Co., Ltd.
International Classes:
H02P27/08; G01P3/486
Domestic Patent References:
| JP201164578A | ||||
| JP200839722A | ||||
| JP10174473A |
Foreign References:
| US20130046486 |
Attorney, Agent or Firm:
Seiryo Patent Attorneys Corporation