Drum washing machine

Abstract

The invention provides a drum type washing machine suppressing electric current flowing through a motor when the number of poles of the motor is switched in spin-drying. When the number of poles of the motor is switched to change its rotational frequency, application of the electric current is started from a minimum conduction angle for driving the motor to suppress the electric current flowing through the motor as well as a rise in temperature of the motor, a power switching means, or the like.

Description

technical field [0001] The invention provides a drum type washing machine, which performs washing, rinsing, and dehydration procedures by rotating and driving a drum that receives laundry. Background technique [0002] Currently, such a washing machine is configured such that a drum that receives laundry and is rotatable about a horizontal rotation axis is driven by two types of motors having different numbers of poles, and the rotational speed is controlled by switching between the two types of motors. The first motor is a high-torque motor with a large number of motor poles (for example: 16 poles), which rotates at a low speed (for example, 120r / min) in washing programs and rinsing programs, and can rotate laundry with a heavy weight in water. The second motor The number of poles of the motor is small (for example, 2 poles), and it can rotate at a high speed (for example: 800r / min) during the dehydration process. These two motors are switched to perform from washing to ri...

AI Technical Summary

Problems solved by technology

[0003] However, in the above-mentioned existing structure, when the drum is raised from a low speed to a high speed in the dehydration program, the first motor is switched to the second motor, but there are problems such as the following: that is, an overcurrent (more than 10A) Flowing through the motor will cause the temperature of electronic components such as the motor and power switch to rise and cause failure.

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