TPT automaatika eriala kursuse töö
An electronic drive or starter is an energy
converter, which modulates the electrical energy supplied to the motor. Electronic starters
are used solely for asynchronous motors. They are a type of voltage controller. Variable
speed drives ensure gradual acceleration and deacceleration and enable speed to be
matched precisely to operating conditions. Controlled rectifier type variable speed drives
are used to supply power to DC motors and frequency inverters are used for AC motors.
Historycally, drives for DC motors appeared first. Reliable and cost effective frequency
inverters appeared as a result of advances in power electronics and microelectronics.
Modern frequency inverters can be used to supply power to standard asynchronous
motors with performance levels similiar to those of the bes DC variable speed drives.
Some manufacturers even offer asynchronous motors with electronic variable speed
drives housed in a custom-made terminal box. This solution is designed for reduced
annaabi.ee 
