Title:
IMPROVEMENTS IN OR RELATING TO ROTOR POSITION DETECTION
Document Type and Number:
WIPO Patent Application WO/2013/124631
Kind Code:
A3
Abstract:
Three windings (12) of a permanent magnet synchronousmotor10are connected from a common point (22) to respective feed points (24) and driven as a different phase of the motor 10by pwm excitation voltages from as witching circuit (28) under the control of a control circuit (38). Eight possible excitations state combinations exist for the circuit in Fig. 2 depending on whether the output of the circuit (28) is at supply voltage or ground for each of the three phases. Measurements are made of ratios of the voltage at the common point (22) as a proportion of the supply voltage, during various excitation states,and a comparison of these ratio values is used to derive position information for the rotor16of the motor (10).
Inventors:
BROWNSON ANDREW (GB)
GIBSON DAVID (GB)
GIBSON DAVID (GB)
Application Number:
PCT/GB2013/050369
Publication Date:
October 24, 2013
Filing Date:
February 15, 2013
Export Citation:
Assignee:
STORED ENERGY TECHNOLOGY LTD (GB)
International Classes:
H02P6/20; H02P6/18
Domestic Patent References:
| WO2009136381A2 | 2009-11-12 |
Foreign References:
| US20100066284A1 | 2010-03-18 |
Attorney, Agent or Firm:
SKINNER, Michael et al. (48 Friar Gate, Derby Derbyshire DE1 1GY, GB)
Download PDF:
Previous Patent: CORRECTION METHOD FOR ESTIMATING FREE LIGHT CHAIN PRODUCTION
Next Patent: METHODS AND SYSTEMS FOR ENERGY CONVERSION AND GENERATION
Next Patent: METHODS AND SYSTEMS FOR ENERGY CONVERSION AND GENERATION