Electric work machine
US12166390B2 · kind B2 · utility
Assignee
Inventor
Key dates
| Filing date | Sep 6, 2022 |
| Grant date | Dec 10, 2024 |
| Priority date | — |
| Expiry date | Jul 20, 2043 |
Classification
- Technology area (CPC B)Performing Operations; Transporting
- CPC primaryB27B17/02
- WIPO fieldElectrical machinery, apparatus, energy
- WIPO sectorElectrical engineering
Abstract
An electric work machine (1) includes: a brushless motor having a stator disposed around a rotor (30); and an output part driven by the rotor. The rotor has a rotor core (31) and first and second magnetic-pole parts (34S, 34N) disposed around a circumferential direction of the rotor core. When the induced voltage of the brushless motor is given as Va, the power-supply voltage of the brushless motor is given as Vb, the rotational speed of the brushless motor is given as ω, a first induced voltage constant, which is expressed by Va/ω, is given as Ea [V/krpm], a pole-pairs count, which is the number of the first magnetic-pole parts or the second magnetic-pole parts, is given as Pi, and a second induced voltage constant, which is expressed as Ea/Pi, is given as Eb [V/krpm·pole-pairs count], the motor satisfies the condition: Eb≤0.025×Vb.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.