Argon user guide/Motor compatibility

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This is a short guide for determining whether or not a motor is suitable for Argon.

Compatible motor technologies

Typical servo motor with encoder feedback

Motor type must be one of the following (either rotary or linear):

  • Permanent magnet brushed DC
  • Permanent magnet brushless DC (BLDC) (magnetic pole count 2 to 100)
  • Permanent magnet AC (magnetic pole count 2 to 100)

Compatible feedback devices

Servomotors must be equipped with an compatible feedback devices.

Encoders

If motor is equipped with encoder, following types are compatible:

  • Encoder voltage 5V
  • Outputs single ended or differential
  • 2 channel encoder is enough for all motor types
  • Suitable encoder resolutions are from about 100 PPR to 131070 PPR (pulses or lines per revolution)
  • Index channel is not required but is supported for precise homing
  • Hall or commutation sensors are not required but are supported for AC/BLDC motors

Resolvers

Argon supports resolver a.k.a. synchro type feedback devices through Argon resolver adapter device. Due to wide variety of electrical properties of resolvers it is difficult to guarantee optimal operation with all resolvers. However, Argon resolver adapter has been designed to work with typical resolvers that come inside servo motors.

Motor power rating

Motor voltages and currents can introduce some limitations to motor output speed and torque but will not cause unsuitability.

  • Motor voltage is the limiting factor for maximum speed. For example, if you have a 200 VDC brushed DC servo motor and run it at 115 VAC using Argon, then you can expect to get a speed of 115*1.41*88%*/200V = 71% of motor's rated speed. 88% comes from Argon's effective voltage swing at power outputs (see Argon specifications).
  • Motor current is the limiting factor for maximum torque. For example, if you have motor rated for 20A DC and drive's maximum output is 10A DC, then you get 50% of the rated torque.

Smallest suitable motors

Argon has high dynamic range torque control which makes it suitable also for very small motors, such as ones with rated current around 300 mA.


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