Y-delta conversion switches on dual stator induction motor
US5051639A · kind A · utility
Assignee
Inventors
Key dates
| Filing date | Sep 26, 1990 |
| Grant date | Sep 24, 1991 |
| Priority date | — |
| Expiry date | Sep 26, 2010 |
Classification
- Technology area (CPC H)Electricity
- CPC primaryH02K17/36
- WIPO fieldElectrical machinery, apparatus, energy
- WIPO sectorElectrical engineering
Abstract
An induction motor including a single rotor formed in one-piece and first and second stators disposed side by side has a phase changing device for varying the phase difference between the rotational magnetic field generated by the first stator and that generated by the second stator. The phase changing device comprises a first-connection changing switch for making the interconnection of respective stator windings of the stators the first series delta-connection in which the phase difference is 0.degree. when it is in its closed-state and a second-connection changing switch for making the respective stator windings the second series data-connection in which the phase difference is 120.degree. when it is in its closed-state. When both the first- and second-connection changing switches are closed, the interconnection of the stator windings becomes a parallel Y (or star)-connection in which the phase difference produced is 60.degree.. During the motor operation, at least one of the first-switch and the second-switch is always kept in its closed-state. The motor exhibits three different torque curves suitable for starting operation, an intermediate speed operation and normal or steady-s…
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.