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

Question

Clemens Herrmann 2021-11-20

0
链接

此问题的直接链接

https://ww2.mathworks.cn/matlabcentral/answers/1591429-how-to-generate-the-proper-pwm-signal-to-control-the-simscape-rc-servo-block

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.

0 个评论
显示 -2更早的评论隐藏 -2更早的评论

请先登录，再进行评论。

请先登录，再回答此问题。

Answer 1

Rick Hyde 2022-2-24

0
链接

此回答的直接链接

https://ww2.mathworks.cn/matlabcentral/answers/1591429-how-to-generate-the-proper-pwm-signal-to-control-the-simscape-rc-servo-block#answer_903750

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