SOLO BETA User Manual
“S/T” and “P/F” PINs in Open_loop Mode:
In Open-loop Mode to control the speed of 3 phase Motors, you need to set both “S/T” and “P/F”
voltage values to apply the desire speed and power respectively, and for each of them you can find
the explanation below:
the speed of the motors in RPM can be derived from the following formulas based on the motor
type selected on Piano Switch, Section 6:
Number of Motor Pole Pairs = Number of Motor Poles / 2
In case of using Analogue Voltages on “S/T”:
● Normal Brushless Motor = (voltage applied at “S/T”)/(5.0* Number of Pole pairs)*8000
● Ultrafast Brushless Motor = (voltage applied at “S/T”)/(5.0* Number of Pole pairs)*30000
● AC induction Motors = (voltage applied at “S/T”)/(5.0* Number of Pole pairs)*4000
In case of using PWM inputs on “S/T”:
● Normal Brushless Motor = (PWM duty-cycle Percentage at “S/T”)/(100%* Number of Pole
pairs)*8000
● Ultrafast Brushless Motor = (PWM duty-cycle Percentage at “S/T”)/(100%* Number of
Pole pairs)*30000
● AC induction Motors = (PWM duty-cycle Percentage at “S/T”)/(100%* Number of Pole
pairs)*4000
Three phase Motors “Power” Notation in Open-loop Mode:
The “P/F” input in open loop mode of 3 phase motors acts as the output voltage adjuster, so by
going all the way up from 0V of Analogue voltage or 0% duty-cycle of PWM inputs at this pin to
+5V or 100%, you will increase the peak 3 phase voltage resulted by SVPWM modulation on
SOLO to the motor linearly from 0V to Vbus/sqrt(3) or equivalently to Vbus*0.577 at maximum,
Vbus here refers to the DC supply input voltage ( or battery voltage ), the action of increasing the
output voltage peak, will result in higher consumption by the motor depending on their phase
resistance and finally having more power for their rotation.
www.solomotorcontrollers.com
January 2021 - Revision V_1.0.5 Copyright © 2020, All right Reversed. SOLO motor controllers.
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