Maintain optimum motor torque and force

Used In:

  • Brushless 3-phase DC motors
  • Brushless 2-phase DC (stepper) motors

Commutation maintains the ideal motor torque and force by determining the optimum operating angle between stator and rotor magnetic fields.

Elmo supports sinusoidal commutation for brushless motors, enabling the highest possible performance for most low speed applications.

Commutation for Elmo drives is built into the Tuning wizard of Elmo Application Studio (EAS):

Elmo drives support commutation with or without absolute commutation sensors:

  • With an absolute commutation sensor, the commutation offset is determined according to the sensor:
    • Encoder with digital Hall
    • Serial Absolute Encoder
    • Analog Hall Sensor and Resolver
  • Without an absolute commutation sensor, the commutation offset is determined after Power Up, upon the first Motor On:
    • Stepper Open Loop: Commutation done by stepper movement
    • Binary Search: Commutation done by minimum movement

Design Features

  • Commutation is performed using a wizard in EAS.
  • EAS wizard determines both positive direction and number of pole pairs
  • EAS wizard determines correct digital Hall wiring order, even when wiring is not standard.
  • Stepper 2-phase motors support all commutation methods
  • With digital Hall sensor only and no incremental encoder, the commutation angle is interpolated according to velocity.
  • For analog Hall and resolver, there must be whole number of pole pairs in one period of sine/cosine
  • Note that DC brushed and voice coil motors are self-commutated and do not require an external commutation process

For more information please contact our motion control experts.

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