Energy-saving three-phase brushless direct-current machine
US12308717B2 · kind B2 · utility
Assignee
Inventors
Key dates
| Filing date | May 5, 2023 |
| Grant date | May 20, 2025 |
| Priority date | — |
| Expiry date | Jan 24, 2044 |
Classification
- Technology area (CPC H)Electricity
- CPC primaryH02K7/116
- WIPO fieldElectrical machinery, apparatus, energy
- WIPO sectorElectrical engineering
Abstract
A brushless direct-current machine is provided, comprising a casing; a body in the casing; a motor in the body; a stator coil bidirectionally wound through slots but not empty slots; and a set of planetary gears. The duty ratio of pulse-width modulation is adjusted by using the three-phase windings of the stator coil to change a current flowing through. A controller switches the current direction of the windings for producing changes in magnetic field. Between the polarity of the stator and the polarities of magnets of a rotor, power is generated owing to the simultaneous functions of same-pole repulsion and opposite-pole attraction for controlling the rotation of the rotor. The 3 empty slots are used to break the original magnetic field into parts to make the rotation force lighter and driving effect better. Thus, an activating current is lowered, and energy and electricity are saved effectively.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.