Method and apparatus for detecting the amount of laundry in a washing machine applied to a brushless DC (BLDC) motor

摘要

[0001] The present invention relates to a method and an apparatus for a bulk laundry washing machine using a brushless direct current (BLDC) motor, and more particularly, So that the effect can be expected.;The conventional technique requires the user to wait for the water supply time to the detection level and the motor on / off repetition time (about 9 seconds) in order to put the amount of detergent suited for the amount of the laundry. Therefore, It is impossible to obtain an optimum washing effect due to excessive or insufficient amount of detergent. In addition, when the induction motor is turned off, the back electromotive force which is lower than the comparison voltage is neglected in the pulse forwarding of the back electromotive force.;In the present invention, the current flowing in the motor when the motor is driven and the number of pulses due to the rotation of the motor when the motor is off can be combined to detect the amount of the fluid in the dry state.