Title:
モータ駆動制御
Document Type and Number:
Japanese Patent JP4614766
Kind Code:
B2
Abstract:
A drive system for a three phase brushless motor uses an algorithm for position sensing which measures the inductance in the motor phases and determines the position from the measured inductances. In order to reduce acoustic noise, the inductances are measured during test periods Tsd, which are conducting states added to the PWM pattern in each PWM period. The test periods have net voltage of zero and therefore do not affect the output of the motor, but are sufficiently long to allow inductance measuring as well as the use of a single current sensor for current sensing.
Inventors:
Jeffrey Ronald, Cowles
Connell Williams
Connell Williams
Application Number:
JP2004533625A
Publication Date:
January 19, 2011
Filing Date:
September 03, 2003
Export Citation:
Assignee:
TWR Limited
International Classes:
H02P6/16; H02P6/18; H02P7/06
Domestic Patent References:
| JP11055983A | ||||
| JP8205578A |
Foreign References:
| WO2001022567A1 |
Attorney, Agent or Firm:
Kazuo Shamoto
Tadashi Masui
Yasushi Kobayashi
Akio Chiba
Hiroyuki Tomita
Fumitoshi Nishiyama
Tadashi Masui
Yasushi Kobayashi
Akio Chiba
Hiroyuki Tomita
Fumitoshi Nishiyama