Electric drive system
US9768714B2 · kind B2 · utility
Assignee
Inventor
Key dates
| Filing date | Feb 5, 2014 |
| Grant date | Sep 19, 2017 |
| Priority date | — |
| Expiry date | Apr 9, 2034 |
Classification
- Technology area (CPC Y)Emerging Cross-Sectional Technologies
- CPC primaryY02T10/72
- WIPO fieldTransport
- WIPO sectorMechanical engineering
Abstract
This invention concerns an electric drive system (200) for driving an output. The electric drive system comprises: a first electric motor (250) arranged to drive a first input shaft (230) at a first angular velocity, ω1, and a second electric motor (260) arranged to drive a second input shaft (240) at a second angular velocity, ω2. A gear mechanism (210) is provided and is arranged to transmit angular rotation of the first (230) and second (240) input shafts to drive the output (220) at an output angular velocity, ωout, such that ωout is proportional to aω1-bω2, where a and b are constants. The electric drive system (200) further comprises a controller (270) arranged to control operation of the first (250) and second (260) electric motors. When the output (220) is to be driven from ωout=0, the controller (270) is arranged to control the first (250) and second (260) electric motors to drive the first (230) and second (240) input shafts. The input shafts are driven in a first phase to primary first and second angular velocities, ω1,p and ω2,p, such that aω1,p≈bω2,p. The input shafts are also subsequently driven in a second phase in which the first angular velocity, ω1, or the second …
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.