Method for operating an electronically commutated motor, and motor for carrying out one such method
US6982534B2 · kind B2 · utility
Assignee
Inventors
Key dates
| Filing date | Aug 7, 2002 |
| Grant date | Jan 3, 2006 |
| Priority date | — |
| Expiry date | Aug 19, 2022 |
Classification
- Technology area (CPC H)Electricity
- CPC primaryH02P29/032
- WIPO fieldElectrical machinery, apparatus, energy
- WIPO sectorElectrical engineering
Abstract
The invention concerns a method for operating an electronically commutated motor (10) that is equipped with a current limiting arrangement which acts on a PWM controller (56). The latter, in operation, delivers PWM pulses (60) having a controllable pulse duty ratio (pwm) and a substantially constant frequency. In the event a predetermined upper limit value (Isoll; Iw) of the motor current (Iist) is exceeded, the current limiting arrangement effects a change in this pulse duty factor (pwm) in order to reduce the motor current (Iist). If the motor current (Iist) exceeds a predetermined upper limit value (Isoll; Iw) while the motor (10) is rotating, that limit value (Isoll; Iw) is raised by a timing member (260) during a predetermined time span (304) (FIG. 8: Iwmax), so that the available motor power is temporarily raised in the context of a load peak. If the rotor (24) is stalled, the limit value (Isoll) is not raised but instead is greatly lowered. The limit value (Isoll) is preferably raised as a function of the rotation speed of the motor (10) in order to utilize the improved motor cooling at high rotation speeds. At start-up of the motor (10), the limit value (Isoll) is briefly i…
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.