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Controlling Electric Motors

Controlling Electric Motors. A technical presentation By: eric babski. 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

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Controlling Electric Motors

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  1. Controlling Electric Motors A technical presentation By: ericbabski

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

  3. 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.

  4. 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.

  5. Variable Frequency Drive System • Consists of : • AC motor • Controller • Operator Interface

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

  7. Programmable Speed Controllers Allen-Bradley PowerFlex 40 Rated for 200-240V .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

  8. Performance Current Speed Torque

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

  10. 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.

  11. Questions?

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