Abstract
Recently the capacity of the Automatic Washing Machine has grown so large and the silent operation has become the main current of the mar ket requirement. For the solution of these two disagreed problems, we applied the Inverter Control System to the 3-phase Brushless DC Motor. Consequently we have reallized the few damage operation and the save energy as half of the usual input power by the spin speed, cycle time and the operation time of the pulsator which is most suitable for each clothes.
Inverter control unit is consist of the parts showed Fig. 1.
We developped the new Intelligent Power Module (IPM) which includes 6-IGBT and their power supply circuit. We used the Bootstrap circuit in the power supply circuits in order to reduce 4 to 1 power supply circuit so we have made IPM small. We designed the frequency of Inverter Switching over 15kHz in order to reduce the noise level. The Inverter control Unit and the operation unit are separated and 2 microcomputors of each unit are intercommunicated with the sirial data.
