Michael D. Sidman, Ph.D.

SIDMAN Engineering, INC.

Mechatronics  ▪  Motor & Motion Control  ▪  Servo Systems

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  • Dr. Sidman's comprehensive simulation model integrates motor electrodynamics, mechanical load dynamics 
    and vector (field-oriented) drive digital control system dynamics.
  • Parameters are easily modified
  • Visually intuitive, interconnected, on-screen block diagrams
  • Internal states of the motor, vector controller, mechanics and electronics are readily observed
  • Intuitive, instructive GUI block diagrams with scopes
  • Model is customized and parameterized for your product application
  • Instruction on model usage

Model typically includes: 

  • Robust, stand-alone state-space 3 AC induction motor model with standard parameters
  • Park and Clark transformations between 3 stator and d-q field-oriented coordinates
  • Feedforward field orientor
  • Rotor flux estimator
  • Field weakening
  • Slip calculator
  • Flux torque calculator
  • Voltage decoupler
  • Peak voltage and current detection
  • Sample time and A/D quantization effects
  • Current, flux, voltage, torque and speed controllers
  • PWM voltage or hysteretic current control
  • DC link
  • Inverter voltage saturation
  • Mechanical load dynamics 
  • Structural flexibility (resonances)
  • Friction
  • Electrical and mechanical power measurement
  • Sensor dynamics


This is a comprehensive, mature and adaptable simulation model developed by an expert in dynamic systems modeling and motor control systems. It will save the time, frustration and considerable expense of attempting to do it in house from scratch. The model still allows designers the freedom to easily change both the simulation model structure and parameters as they later see fit. Designers are able to develop a product more rapidly, saving significant time in prototyping.

This tool allows product designers to rapidly develop and optimize a complete vector drive product and directly observe the closed-loop performance and interaction of an AC induction motor, an attached mechanism, DC link and the digital vector controller. Although many variable speed AC motor applications require the high performance offered by vector control, the time and cost to develop and optimize a complete simulation model of this kind can be daunting. 

This fully parametric, open architecture simulation model and design tool is based on MATLAB and SIMULINK,  and allows users to explore a multitude of what-if possibilities, tune performance and debug any problems before or concurrent with prototype development. The user has direct visual access to the internal states of each of the interconnected and simultaneously operating electrical, mechanical and control portions of the system. The designer may also evaluate the effect of worst-case component tolerances, fairly evaluate competing control and sensing schemes, and explore the closed-loop effect of various loads, including mechanical resonances and friction.

Designers can observe the closed-loop performance and simultaneous interaction of AC induction motor electrodynamics, a complex mechanical load and the vector drive digital control dynamics, as well as predict and correct harmful interactions.

The 3 AC induction motor simulation model may be run on other controllers or under load without a controller at all.


  • Elevators, HVAC, Hybrid and Electric Vehicle Propulsion
  • Engine and Vehicle Dynamometers
  • Variable Speed AC Motor Drives
  • Belt Drive Systems
  • Robotics and Material Handling
  • Precision AC Servo Systems
  • Machine Tool and Industrial Control


Typical display of just several of the many scope views available in this simulation model:

Simulation of an AC induction motor vector control system.

A 40 HP motor is already spinning as the vector control system is turned on.
The torque response is seen to be equally responsive both at high and very low speeds.

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MATLAB and SIMULINK Training is available.

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