Electronically commutated motor
US8508174B2 · kind B2 · utility
Assignee
Inventors
Key dates
| Filing date | Apr 3, 2009 |
| Grant date | Aug 13, 2013 |
| Priority date | — |
| Expiry date | Oct 8, 2030 |
Classification
- Technology area (CPC Y)Emerging Cross-Sectional Technologies
- CPC primaryY02B30/70
- WIPO fieldElectrical machinery, apparatus, energy
- WIPO sectorElectrical engineering
Abstract
An electronically commutated motor (ECM 20) has a rotor (28) and a stator, associated with which is a winding arrangement (26) to which electrical current (i1) is applied to drive the motor (20), a computer (36), and a PWM generator (84) associated therewith. The motor (20) is designed for operation in a parameter range that encompasses at least one variable parameter, e.g. operating voltage or ambient temperature, that can have different values. The computer (36) is configured to operate by carrying out these steps: After the motor (20) is switched on and before normal startup begins, during an initial time phase (T1), current (i1) delivered to the stator winding arrangement (26) is switched off and on using a pulse duty factor (pwm) derived from said variable parameter, in order to produce startup of the motor (20); subsequent to phase (T1), when the rotor (28) is rotating, normal startup is performed.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.