1. What is the goal for your project?
Nowadays electric motors are no more limitedly applied in traditional traction systems, but also in servo systems, such as robotics, automobiles, and CNC lathes, which require higher precision of positioning, fast speed regulation, less overshoot and steady state ripples as well as customer-friendly adjustment of control parameters.
Conventional close loop control methods of BLDC and AC motor drives are close loop V/f, Vector Control and Direct Torque Control. As the development of micro controllers and semiconductor industries, Model Predictive Control (MPC), as an emerging control method for power electronics, becomes a promising option for servo controls and trend for future applications. To further improve the torque dynamics, a disturbance observer (DO) designed for drive mechanical system will also be applied. BLDC motor has comparatively high power density and efficiency, and is usually applied in control systems with high dynamics requirement and restricted space and weight, which is the case for most servo systems. Therefore, it will be chosen as the test motor in this project. The system’s schematic for speed regulation is shown in figure.1.
Based on the advantages of the extremely high switching frequencies of TAPAS, both classes of MPCs: FCS-MPC (or: discrete MPC) and continuous MPC with DO will be implemented on a low power BLDC motor to find out various operation points’ performance, aspects and extent of improvements, maybe also (theoretically some but hopefully no) deteriorations under control within different higher switching frequency ranges.
2. How does the technical set-up look like?
The test bench is designed in two steps:
Firstly, a TAPAS-BLDC-Dynamometer system will be set up to test the BLDC motor’s performances under speed and position control modes. Dynamometer is initially applied for precise step loadings. (Figure.2)
If the drive in the first set-up isreliable and works well, then secondly, a 2TAPAS-2BLDC drag system willbe set up, in which one pair is the load system under torque control mode and theother pair is the speed control system already tested in the first test set-up.Different from the previous set-up, this is to test the BLDC motor’sperformances under torque control mode. (Figure.3)
DC power source(s) and oscilloscope will be used.
3. Are you working in a team? List the names of your team members.
We are a team of three: Sabrina Xuezhu Mei (F), Haotian Xie (M) and Dr.-Ing. Fengxiang Wang (M).
4. How many TAPAS boards will you need for your project?
Two boards are needed. As explained in Part 2, one is for drive motor and the other is for load motor. When only the first TAPAS is under test in the first set-up, the second TAPAS will be temporarily shared with our trained master students in lab for study purpose.
This idea will get two TAPAS dev kits.