Motor control for two motors
AssigneeDyson Limited
InventorGiovanni Mario Raimondi
Life of this patent
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Abstract
A load in an electrical apparatus is driven by two motors M1, M2. Switching means (R1, R2) switches the motors M1, M2 between: a series configuration, in which the motors M1, M2 are connected in series across a power supply and driven with a dc supply; and a parallel configuration in which the motors M1, M2 are connected in parallel across the power supply and driven with an ac supply. In the series configuration, a bridge rectifier BR is switched across the ac supply to provide the dc supply for the motors M1, M2 and in the parallel configuration, the rectifier BR is removed from the circuit. The arrangement can be used to drive a drum of a washing machine or a load in some other kind of appliance.
Claims10
A drive for driving a load in an electrical apparatus, comprising first and second motors coupled to a power supply, outputs of the motors being used to drive the load, and a switching structure for switching the motors between a series configuration, in which the motors are connected in series across the power supply and driven with direct current;
- and a parallel configuration in which the motors are connected in parallel across the power supply and driven with alternating current.
A method of operating a drive for driving a load in an electrical apparatus, the drive comprising first and second motors coupled to a power supply and whose outputs are used to drive the load, and a switching structure, the method comprising:
- operating the switching structure so as to switch the motors between a series configuration in which the motors are connected in series across the power supply and driven with direct current and a parallel configuration in which the motors are connected in parallel across the power supply and driven with alternating current.
Dependencies are inferred from the claim text.