Seminars & Presentations

On-Site Workshops

A comprehensive workshop tailored to your company’s interest and need is available. Workshop length can vary from one half-day session to two full days, optionally followed by informal discussion or review of client’s existing design for several hours to a full day. The following synopsis depicts a typical workshop course, including contents often taught at various technical conferences.

Please contact Dr. Ohm (ohm@drivetechinc.com) directly for more detailed objective and contents as well as schedule and fee for customized lecturing.

Course #1: Basic Principles of DC, and PM Brushless Motor Control ( Half-day)

This introductory course is to provide fundamental concepts of motor control. The objective of this course is for motors & drive designer, application engineers as well as marketing and management professionals who want to learn fundamental principles and basic knowledge on electromagnetic torque production mechanism, construction and operation of DC and PM brushless motors. The course starts with the magnetic and mechanical structure of the various motor types (including DC, induction and SR motors) and feedback devices to understand torque production mechanism and required commutation logics. Discussion is followed by control of power semiconductor switches, PWM, motor drive topologies, drive hardware, control algorithms, as well as software implementation. The content also explains pros and cons of drive technologies such as 6-step vs. sinusoidal, voltage drive vs. current drive, phase current regulator vs synchronous current regulation, and sensored vs sensorless control. The course also includes feedback control basics, various feedback devices,  and servo system analysis including current regulation, voltage and position control using PI, PID and Model-based Control architecture and their tuning.  From the author’s long experience in research and development of many different types of drives, practical and useful procedures in selecting control method, rule-of-thumb design rules, control system structure and tuning, performance vs. cost tradeoff will be discussed.

Course #2: Field Oriented Control and Advanced AC Motor Control Algorithms (Half-day)

This course will provide in-depth knowledge and skills in control algorithms and software to design high performance AC motor drives and control systems. The course is intended for experienced engineers who have prior exposure in motor drive design, or have basic knowledge in DC and brushless motor control theory & PID control as outlined in Course #1.
The course starts with the basic principles of FOC (Field Oriented Control, aka Vector Control), reference frame transform theory, and dynamic motor model of PM motors (both surface and Interior PM motors), Switched and Synchronous reluctance motors, and induction motors. Then the discussion continues control methods applying the FOC principles to all the above motor types. Discussion is followed by various advanced motor control techniques for high performance and energy efficiency including Predictive current control, Space Vector Modulation, Field Weakening operation, and more in-depth Sensorless control technologies. Enhanced motion control theory includes vibration and resonance control, additional outer loop control methods such as pressure or torque control.

Additional Material – Can be included in addition to the above

2-day course will include enhanced material added to the above contents, and the following topics could be selectively included.

  • History of Electric Machines and Control Methods
  • Magnetic Circuit theory and Soft/Hard Magnetic Material
  • AC-DC Power Converters
  • Power Factor Correction (PFC) Methods
  • Power Semiconductor Devices and their Characteristics
  • Trends toward Low-cost, Integrated Design
  • Generator Control and Grid-tied Inverters
  • Fractional Arithmetic for Implementation of Motor Control Software
  • Sensors used in Motor Control Systems
  • Motion Profiles
  • High Speed and Ultra-high Speed Motor Control
  • Recent Trends in Motor Control
  • Other related topics of interest, requested from Clients