Motor with reduced torque ripple
US6285104A · kind A · utility
Assignee
Inventor
Key dates
| Filing date | Apr 26, 1999 |
| Grant date | Sep 4, 2001 |
| Priority date | — |
| Expiry date | Apr 26, 2019 |
Classification
- Technology area (CPC H)Electricity
- CPC primaryH02K2213/03
- WIPO fieldElectrical machinery, apparatus, energy
- WIPO sectorElectrical engineering
Abstract
A motor is constructed such that the amplitude of a current phasor of each of the slots on a stator when three-phase sinusoidal current is applied to each phase of the motor in a permanent magnet synchronous motor and reluctance motor. The number of windings of each phase looped through each of the slots is determined such that a phase of each current phasor of each of the slots is coincident with a phase in terms of electrical degrees in a direction of rotor rotation of each of the slots. A center position of each magnetic pole of a rotor steel plate is shifted to the direction of rotor rotation by slot pitch/NRR, 2.times.slot pitch/NRR, 3.times.slot pitch/NRR, . . . , 1-slot pitch against a position divided equally into 360.degree./NRR, where NRR is the number of poles. The stator and the rotor are relatively skewed by the slot pitch/ NRR.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.