Variable input outputs / analog signals / frequencies

Electric motor is an important component of every industrial automation system. Electric motor speed is controller with variable signals like analog, PWM or  frequency signal.


Analogue signals are commonly used in a broad area of applications. Behaviour in  environment are analogue when sensing these physical behaviours they will be converted often to electrical analogue signals. Therefor a lot of sensors that are found on the market have analogue signal outputs. These signals could either be voltage or current signals. Current signals are prefered when having long cables or noisy environment. Analogue outputs are often used for controlling speed of electrical motors and other actuators. The output signal itself has usually low current capabilities.


The permanent magnet synchronous motor (PM synchronous or PMSY motor) is perhaps the most dominant motor for automation equipment in the engineering industry, for example, industrial robots and numerically controlled machines. Part of the simulation model is illustrated below.




Learning outcomes

After this course student shall be able to:

  • Understand the function of a PMSY motor

  • Build a model of a PMSY motor

  • Perform simulations for both open loop and closed loop control of PMSY motor