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US 4,446,706 AGranted
Washing machine
AssigneeInstitut Cerac S.A.
InventorCarl S. M. Hartwig
Life of this patent
Estimating the term…
Abstract
The invention relates to a washing machine which comprises a casing (1) having a washing-liquid container (2) and a cylindrical washing drum (3) rotatably arranged in the container. The washing drum is driven by a single, brushless a.c.motor, to which energy is supplied from an inverter (41), so that the washing machine may be driven at a desired, alternative number of revolutions/min, which are preprogrammed and within an extended range of revolutions/min.
Claims8
A washing machine comprising;
- a casing (1) which includes a washing-liquid container (2) and a washing drum (3) rotatably supported within the container (2) and intended to receive a washing load;
- a single electric bi-directional, brushless a.c. motor (84) including a rotor and a stator, means directly mechanically connecting said rotor to the rotatable washing drum, said a.c. motor being of multi-pole type and provided with terminals connected to a source of a.c. mains voltage via the out-put terminals of an inverter (41), and said inverter comprising means for generating an a.c. voltage at a variable frequency having a maximum value corresponding to the highest rotational speed of the washing drum selected and being in excess of the frequency of the mains voltage supplied to the inverter input.
Dependencies are inferred from the claim text.