Overview of Electric Motor Drives

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Chapter 1

• Overview of Electric Motor Drives

Energy Electric Motors History of Motor
Control Motor Control Methods Electric Motor
Drive Features
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• Energy sources include coal, nuclear power,
  natural gas, oil, water (hydroelectric or
  mechanical power), wind, and the sun.

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• Electrical energy consumption varies for
  different types of devices and motors.

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• Electrical energy consumption varies for
  different types of devices and motors.

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• Electric motors may use 1f AC, 3f AC, or DC power.

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• Knife switches were the first devices used to
  start and stop electric motors.

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• Manual motor starters can be used to control
  various types of motors.

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• Two manual starters are required for forward and
  reverse operation of motors.

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• Magnetic motor starters are used to control most
  types of motors. Magnetic motor starters also
  feature overload protection.

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• Electric motor drives offer many motor control
  functions, including reduced motor speed and
  controlled acceleration/deceleration.

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• Electric motor drives include built-in meters
  that measure and display voltage, current, power,
  frequency, and temperature.

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• Motor drives include built-in monitoring and
  display of faults.

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• In addition to controlling the motor speed,
  drives can be programmed for certain speed ranges.

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Drives can be programmed to allow a motor to
coast to a stop or they can be programmed to
apply a controlled braking force.
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Using an electric motor drive may save up to 70
in energy use and cost.