Schematic workflow for project planning

The following flow diagram illustrates the drive selection procedure for a positioning drive. The drive consists of a gearmotor that is supplied by an inverter.

Required information about the machine to be driven

  • Technical data and ambient conditions
  • Positioning accuracy
  • Speed setting range
  • Calculation of the travel cycle

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Calculate the relevant application data

  • Travel diagram
  • Rotational speeds
  • Static, dynamic torques
  • Regenerative power

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Gear unit selection

  • Define the gear unit size, gear unit ratio, and gear unit design
  • Check the positioning accuracy.
  • Check the gear unit load.
  • Check the input speed.

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Motor selection

  • Maximum torque
  • With dynamic drives: effective torque at medium speed
  • Maximum speed
  • Observe dynamic and thermal torque curves.
  • Motor equipment (brake, plug connector, thermal motor protection, etc.)

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Inverter selection

  • Determine the control mode.
  • Motor/inverter assignment
  • Determine the PWM frequency.
  • Check if the inverters fulfill the duration and overload requirements.

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Select the braking resistor

  • Check if the braking resistor fulfills the duration and overload requirements.
  • Observe braking resistor assignment.

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Select other system components

  • Option cards
  • Motor and supply system cables
  • Signal and encoder cables
  • EMC measures

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Select the 24 V voltage supply

  • Determine the current demand of the 24 V voltage supply.
  • Observe the requirements for the voltage tolerance.

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Ensure that all requirements have been met.