Driving system for an induction motor having a circuit for generating a slip pulse and a phase shifting pulse
US5270632A · kind A · utility
Assignee
Inventors
Key dates
| Filing date | May 7, 1992 |
| Grant date | Dec 14, 1993 |
| Priority date | — |
| Expiry date | May 7, 2012 |
Classification
- Technology area (CPC H)Electricity
- CPC primaryH02P23/08
- WIPO fieldElectrical machinery, apparatus, energy
- WIPO sectorElectrical engineering
Abstract
A driving system for an induction motor which is capable of properly controlling the speed of an induction motor over its high-speed revolution range and also features an excellent responsiveness to a speed command. In this system, a slip pulse (SSP) and a phase shifting pulse (FSP) are calculated by a slip pulse generator circuit (20) and a phase shifting pulse generator circuit (21) in accordance with slip pulse data (SB) and phase shifting pulse data (FB) which are calculated by a processor (1) in accordance with the speed command and an output of a speed detector. A counter (24) issues the first changeover signal (CS1) each time it receives a specified number of pulses from a pulse overlapping circuit (23). The first changeover signal corresponds to a feedback pulse calculated in accordance with the output of the speed detector and also to the slip pulse and the phase shifting pulse added. A square wave output circuit (26) generates square wave signals (Us through Ws) in accordance with the first changeover signal, the second changeover signal (CS2), which is obtained by delaying the first changeover signal, and rotational direction identifying signals (RS, RS) received from th…
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.