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Motor control device for two motors and method

A motor and switching device technology, applied in motor generator control, motor speed or torque control, multiple motor speed/torque control, etc., can solve the problem of brush wear, large current, large harmonic content, etc. question

Inactive Publication Date: 2005-05-11
DYSON TECH LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0004] At low speed, if a parallel connection is used, the harmonics corresponding to the absolute current are also large due to the need to absorb a large current from the power supply. At the same time, due to the large current and large firing angle, the normalized harmonic content is large, and power factor difference
In addition, due to the unbalanced wear of the two brushes of the motor in DC, the life of the motor is greatly shortened
Brushes wear most at high speeds, further shortening motor life

Method used

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  • Motor control device for two motors and method
  • Motor control device for two motors and method
  • Motor control device for two motors and method

Examples

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Embodiment Construction

[0027] The following examples illustrate how the invention can be applied to washing machines. figure 1 and 2 A washing machine 10 is shown comprising a housing 12 in which a stationary tub 40 is disposed. The drum 50 is mounted inside the tub 40 so as to be rotatable about an axis 85 along a shaft 80 . Bucket 40 is also supported inside housing 12 by suspension struts 90 . Barrel 40 is sealed except for inlet 21 and outlet 22 . The washing machine 10 includes a soap tray 20 capable of receiving detergent in a well known manner. At least one water inlet 23 communicates with the soap tray 20 and provides suitable means for connecting to a water source in the environment in which the washing machine 10 is used. A conduit 21 is provided between the soap tray 20 and the tub 40 to guide water into the tub 40 through the inlet 23 . The tub 40 has a sump 26 installed under the drum 50 . Drain 28 communicates with sump 26 and directs water to outlet 30 through which water can be...

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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.

Description

technical field [0001] The present invention relates to drivers for driving loads in electrical equipment, and electrical equipment incorporating such drivers. It can be used in laundry appliances such as washing machines or washer-dryers, but is not limited to use in such appliances. Background technique [0002] Electric motors are widely used in equipment for various purposes. In laundry appliances such as washing machines, washer-dryers, and dry cleaners, an electric motor is used to rotate a drum containing laundry. The drum is required to spin at a range of speeds, from a relatively low spin speed of about 50 rpm during laundry to a relatively fast spin speed of 1600 rpm or more during spin drying. In domestic machines, the laundry load in the drum can be a load of 11kg or heavier. Clearly, the motors that rotate the drum are required to operate under a wide range of conditions. Typically the electric motor is an ac motor powered by mains power. In Europe, ac moto...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): H02P7/74D06F37/30H02P5/60H02P5/00H02P5/74
CPCD06F37/304H02P5/00Y02B40/00H02P6/04H02P8/40
Inventor G·M·赖蒙迪
Owner DYSON TECH LTD
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