SOLO BETA User Manual
“S/T” PIN in Closed_loop Mode:
This is the input for controlling Speed or Torque of the Motor connected to SOLO, you can select
this mode using the Piano switch mentioned in section 6, the analog voltage or the duty cycle of
PWM pulse applied in either of the conditions will be treated as a desired reference of the user
based on following explanations:
In Torque mode:
if you apply an analog 5V or in case of using PWM inputs, a 100% duty cycle to this pin, without
having a current limit, SOLO will try to inject 32A of current inside your motor , given this, the
amount of Torque for motors generally can be calculated:
Applied Motor Torque = Current acting in torque generation * Motor Torque Constant
The “Current acting in torque generation” for DC motors is shown with “IM” and the same for 3
phase motors (BLDC , PMSM or ACIM) is shown by “Iq” or namely the “Quadrature current”.
So the amount of active current in torque generation injected to your motor based on the amount
of voltage or duty cycle you apply to S/T pin can be calculated as:
In case of using PWM:
The torque generation Current = ((100 - duty cycle of PWM at S/T input)/100) * 32.0
In case of using Analogue Voltages:
The torque generation Current = ((5.0 - the voltage at S/T input)/5.0) * 32.0
www.solomotorcontrollers.com
January 2021 - Revision V_1.0.5 Copyright © 2020, All right Reversed. SOLO motor controllers.
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