Multi-phase hybrid stepper motor
US5374865A · kind A · utility
Assignee
Inventors
Key dates
| Filing date | Jul 30, 1993 |
| Grant date | Dec 20, 1994 |
| Priority date | — |
| Expiry date | Jul 30, 2013 |
Classification
- Technology area (CPC H)Electricity
- CPC primaryH02K37/18
- WIPO fieldElectrical machinery, apparatus, energy
- WIPO sectorElectrical engineering
Abstract
To minimize fluctuation of torque, improve torque stiffness, and reduce resonance vibration during rotation in the hybrid stepper motor. The magnetic poles have two or more teeth placed with the same spaces as with toothpitch of the rotor. The total number (NS) of the teeth of the nonsymmetrical stators is determined by NS=5.times.(n0 +nl), where n0 is the number of teeth of each of five poles and nl is the number of teeth of each of remaining five poles. The nonsymmetrical stator, of which the teeth are nl, is placed between the nonsymmetrical stators, of which the teeth are n0, so that the nonsymmetrical stator, of which the teeth are n0, is placed on the opposite side of the nonsymmetrical stator, of which the teeth are n1, when the core of the rotation axis is the center. The total number (NS) of the teeth (NR) of the rotor and the teeth of the stators corresponds to the relationship of NS.gtoreq.0.8 NR (NS is equal to or greater than 0.8 NR), and the difference between NR and NS is defined by the equation NR-NS=K(S0-S1)+10(S1-1+B), where K is an integer between 2 and 5, S0 and S1 are integers as small as possible in such a way that S1 can also be equal to S0, B is a fraction o…
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.