Brushless, permanent magnet d-c pulse current controlled, essentially uniform torque dynamo electric machine particularly motor
US4322666A · kind A · utility
Assignee
Inventor
Key dates
| Filing date | Apr 2, 1981 |
| Grant date | Mar 30, 1982 |
| Priority date | — |
| Expiry date | Apr 2, 2001 |
Classification
- Technology area (CPC H)Electricity
- CPC primaryH02K29/08
- WIPO fieldElectrical machinery, apparatus, energy
- WIPO sectorElectrical engineering
Abstract
A permanent magnet motor designed for d-c operation with pulsed current supply through at least two, and preferably four or more stator coils, has a rotor magnetized such that, with respect to 180.degree. electrical, about 120.degree. are magnetized in one magnetic polarity, and the remaining about 60.degree. are magnetized with dual polarity to provide a monopole zone of magnetization and a dipole zone of magnetization, a galvano-magnetic sensing element being exposed to the path of circumferential rotation in which the same polarities of the dipole and monopole zones are contiguous for control of pulse current flow through the windings of the motor. A tachogenerator winding may additionally be included in the air gap, exposed only to the rotary path of one magnetic pole of the dipole zone and the monopole zone.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.