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Automatic washing machine motor control system
Post: #1

would like to get some ideas on automatic washing machine motor control circuits based on micro controllers for our project. pls anyone of u help
Post: #2
Here, a system of wash action control for an automatic washing machine is described. Many discrete agitation speed selections areavailable and can be selected by the user. There is continuous speed agitation mode for a given agitation period during a wash cycle and an intermittent speed agitation mode for at least a part of a given agitation period.

Modern washing machines usually employ a number of functional features. This includes a variety of washing regimes like regular, permanent press, soak only etc. Most machines include user-selectable controls allowing the user to set the machine differently for different washing tasks, action, or regimes. Described here is the washing machine having a wash tub or drum, an impeller or agitator within said wash tub, and a motor for operating the agitator.. An electrical control circuit is connected to the motor which includes, an electrical timer motor which operates a timer for providing power to an agitation speed selection control, having many discrete speed selections, and by mechanical components, causes the motor to operate the agitator at intermittent times during an agitation period. Another option maybe an electrical motor having many speeds for operating the agitator at mnay different speeds.The agitation speed selection control allows a user to select between agitation speedmodes regardless of washing regime or cycle. A continuous speed over an agitation period set by the control circuit and electromechanical components based on a user-selected washing cycle. An intermittent speed mode is there which cause the motor to operate the agitator at one speed for at least one sub-period of an agitation period, and operate said agitator at eitheranother speed or at no agitation for at least one different sub-period of the agitation period.

Construction and working:
The washing machine consists of a housing (usually sheet metal) and includes a lid and a control panel. A one drive motor(a two-speed electric motor) is utilized to drive both spinning of the drum and the action of an agitator in the drum. The twospeeds are accomplished here by passing electrical current through one of two different windings. The control panel includes a dedicated speed switch comprising a slider which the user can move to any of four discrete positions.rotary switches, push button switches or other selectors or user-interfaces (e.g. touch screen) maybe alternatively used. A Two-speed electric drive motor , a lid switch , andan electric timer motor are included in the circuit and also the automatic temperature control switch, water level switch etc.
The electromechanical cam arrangement is used in many present automatic washing machines.An electric motor rotates a spindle at a controlled rate. A user simply turns a control dial to a selected regime. This enables the water valve to initiate filling of the wash tub with water.hen the selected water level is achieved, the spindle starts rotating. The cams cooperate with one or more electrical contactors positioned adjacent the spindle such that when the spindle is in a certain rotation position, one or more cams complete an electrical circuit by mechanically closing the points of a contactor. . The configuration of the cam and the speed of rotation of the spindle determine the length of time the circuit is closed.

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