Motor Drive

MOTOR CONTROL APPLICATIONS

High efficiency, reduced noise, extended lifetime, rapid time to market. And all at optimum cost. This is the challenge currently facing the many industries, which use electric motors. Today, the demand for electronic motor control is increasing rapidly, not only in the automotive and computer peripherals markets, but also in industrial applications and home appliances such as heating and ventilation systems, power tools, vacuum cleaners and white goods. All these mass-market applications need cost-effective solutions without compromising reliability.

AC universal motor

The motor is connected to the mains through an AC switch. The AC voltage varies across the motor in phase control mode by means of a microcontroller which sets the triac triggering time.

Main applications
■ Vacuum cleaners
■ Washing machines
■ Power tools
■ Food processors

DC universal motor
A thyristor supplies the motor during the positive mains half cycle. Both the thyristor and its control are connected in such a way that the motor back-EMF compensates load variations to adjust the speed.

Main applications
■ Food processors
■ Power tools

PWM universal motor

A rectified voltage across the motor varies in PWM mode at an inaudible switching frequency. A DC supply provides smooth current operation, reducing (acoustic) motor noise and improving motor efficiency.

Main applications
■ Washing machines
■ Food processors
■ Treadmills
■ Industrial motion control