초록 ▼

A food preparation appliance including a housing, an electric motor supported in said housing and adapted to receive alternating current. A tachometer senses rotation of said electric motor and feeds a tachometer signal to a frequency to voltage converter. A conversion ratio between said tachometer

A food preparation appliance including a housing, an electric motor supported in said housing and adapted to receive alternating current. A tachometer senses rotation of said electric motor and feeds a tachometer signal to a frequency to voltage converter. A conversion ratio between said tachometer input signal and an output signal of said frequency to voltage converter is alterable by actuating a timer which causes a speed of the electric motor to decrease. The output signal of the frequency to voltage converter is supplied to an error amplifier where it is compared with a setpoint signal to generate an error signal supplied to a triac which controls a flow of electric power through the electric motor.

대표청구항 ▼

A food preparation appliance comprising: a housing; an electric motor supported by said housing and receiving a flow of electric current, said electric motor driving a food preparation implement; control means for controlling electric power connected to said electric motor and receiving said electri

A food preparation appliance comprising: a housing; an electric motor supported by said housing and receiving a flow of electric current, said electric motor driving a food preparation implement; control means for controlling electric power connected to said electric motor and receiving said electric current to control a speed of said electric motor; and means for altering said flow of electric current through said control means for a predetermined time interval to reduce said speed of said electrical motor during said time interval, said means for altering said flow of electric power including a timer and means for actuating said timer, said timer when actuated causing said flow of electric power to be altered until expiration of said predetermined time when said flow of electric power is returned to its unaltered state.