How to generate the proper PWM Signal to control the Simscape RC Servo Block

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Clemens Herrmann
Clemens Herrmann 2021-11-20
回答： Rick Hyde 2022-2-24
I want to use the Simscape RC Servo Block in my simulation. For real life servos, there is usually a cycle time (e.g. 20ms) and a pulse width (e.g. 0.5-4ms) specified.
https://en.wikipedia.org/wiki/Servo_control
But in the documentation of the RC Servo Block there is no Cylce time specified.
Question 1: Is it correct that for the RC Servo Block the cycle time is always double the current Pulse with?
Question2: What's the best way to generate the right signal? I need a system that takes in the desired servo angle and spits out the correct pwm signal.
Thanks.

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采纳的回答

Rick Hyde
Rick Hyde 2022-2-24
An RC Servo contains its own controller that sets the output angle. The angle set set by the pulse period of the voltage applied to its control input; the longer the pulse, the higher the commanded angle. To drive an RC Servo you need a controlled PWM signal generator. Simscape has a block that does exactly this: Controlled PWM Voltage. You can configure this block to be drive either by a voltage difference (default), or a PS signal input.
Hope that helps
Rick

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