Control modes
Three main control modes in motion & motor control are torque, velocity and position control.
Torque control
Torque control mode makes motor a torque or force transducer. I.e. user sets torque reference to 1 Nm, then motor will produce 1 Nm torque regardless of spinning speed.
- Typical applications
- Automatic tightening of screws
- Feeding/pulling
- Cascaded controller after velocity or position controller
- Non-motion applications: high current LED & Peltier driver when drive used just as adjustable current source
Velocity control
Goal of velocity control is to regulate motor speed. I.e. if user velocity reference is 500 rpm, then motor attempts to rotate exactly at 500 rpm no matter how much load is attached to motor.
- Typical applications
- Spindles
- Feeding
- Fans & pumps
- Position control when used with external or internal position controller
Position control
Position control mode attempts to provide precision positioning. Motor follows reference set point and if set point is kept constant, motor holds position even if external forces attempt to displace it.
- Typical applications
- CNC
- Pick & place machines
- 2D/3D printing
- Robotics
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