Method of driving the impeller of a liquid pump by means of a brushless a.c. motor; and a liquid pump for carrying out the method
US4511312A · kind A · utility
22Cited by
6References
11Claims
0Family size
Assignee
Inventor
Key dates
| Filing date | Jun 1, 1983 |
| Grant date | Apr 16, 1985 |
| Priority date | — |
| Expiry date | Jun 1, 2003 |
Classification
- Technology area (CPC H)Electricity
- CPC primaryH02K11/33
- WIPO fieldElectrical machinery, apparatus, energy
- WIPO sectorElectrical engineering
Abstract
The invention relates to a method and apparatus for driving the impeller (5) in a turbo-type liquid pump operating at relatively low power and relatively high delivery head by means of an a.c. motor (2). The invention is mainly characterized in that the motor (2) is driven from a static inverter (6) which operates at an operating frequency of 100-1000 Hz. This enables high specific speed impellers to be used, and therewith provides a considerable increase in the efficiency and capacity of the pump at unchanged motor sizes.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.