A TECHNICAL PRESENTATION BY: ERIC BABSKI Controlling Electric Motors

Electric Motors Used in almost everything Both AC & DC Require a “Motor Controller”

Motor Controllers Allow you to start/stop motors Protect against current overloads Operated Manually, Remotely, or Automatically 2 Main Types Motor Starters  Connect and disconnect a motor to a power source. Variable Frequency Drives  Regulate motor torque, speed, or horsepower.

Variable Frequency Drive Used to control AC motors The most common type is constant-voltage Uses pulse width modulation to control both the frequency and effective voltage applied to the motor load.

Variable Frequency Drive System Consists of :  AC motor  Controller  Operator Interface

Voltage Vs Frequency Requires the applied voltage to be proportionally adjusted whenever the frequency is changed in order to deliver the rated torque.

Programmable Speed Controllers Allen-Bradley PowerFlex 40 Rated for V.3 hp 1.5 amps Programmable Local potentiometer and control keys 4 digit display with 10 additional LED indicators display drive status, errors and additional information

Performance Current Speed Torque

Programming Set Information  Speed  Acceleration  Output Current  Output Voltage  Freq min/max Record Information  Run time  Brake time  Faults

Summary Electrical motors require a controller to operate There are two main types  Variable frequency controller  Starter VFC’s  Use PWM to change speed  Protect against current overloads Allen-Bradley PowerFlex 40  Programmable AC motor controller  Controls Speed, Acceleration, Deceleration etc.

Questions?