Presentation Title

Motor Control for Hybrid-Electric and Electric Motors

Faculty Mentor

Kurt Kloesel, Tim Usher

Start Date

18-11-2017 1:45 PM

End Date

18-11-2017 2:00 PM

Location

9-263

Session

Physical Sciences 3

Type of Presentation

Oral Talk

Subject Area

physical_mathematical_sciences

Abstract

Developing the technology to drive the electric motors for the NASA hybrid-electric and all electric air vehicle efforts contributes to NASA’s goal of reducing fuel consumed by half and reducing emissions. Proportional-Integral-Derivative (PID) control scheme of electric motors is a common method of control. In order to compose a robust PID control program, it is necessary to use a motor controller with software that is predictable and customizable. A Graphical User Interface (GUI) was developed to help control the motor and evaluate the speed, torque, current and voltage readings from the motor. The GUI included numerical information and an oscilloscope for visual reference. The information collected from the GUI can be exported to an excel file and evaluated. The fine tuning of a PID motor control system requires knowledge of the inductance and resistance of the motor. The inductance and resistance of several different permanent magnet synchronous motors (PMSM) were measured using a laboratory grade Inductance, Capacitance and Resistance (LCR) meter. LCR values used in a comparative study with motor control software with built in automatic parameter identification software in the input for validation. The information gathered from evaluations like these will give a better understanding towards the development of electric and hybrid-electric air vehicles.

Summary of research results to be presented

In the first part of the tests, we measured the inductance and resistance values of the motor. The inductance values measured on the LCR meter were similar to those measured through the motor controller, but we noticed the inductance values of low inductance motors were sensitive to the frequency of the AC signal. The resistance values were the same in each test.

In the second part, a GUI was developed to control and measure values through the motor controller and CANbus. We tested the GUI and noted that the GUI performed well and we got the results we expected. The torque was proportional to current and the relationship is linear. However, since the contra-rotating motor shafts were locked together we expected torque to be exactly the same but it wasn't.

We then compared the current and voltage information measured in the lab. Analysis of the circuit indicated the gain should be 20, which we get in the mid-range, but it appears to distort at extremities. This requires further study.

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Nov 18th, 1:45 PM Nov 18th, 2:00 PM

Motor Control for Hybrid-Electric and Electric Motors

9-263

Developing the technology to drive the electric motors for the NASA hybrid-electric and all electric air vehicle efforts contributes to NASA’s goal of reducing fuel consumed by half and reducing emissions. Proportional-Integral-Derivative (PID) control scheme of electric motors is a common method of control. In order to compose a robust PID control program, it is necessary to use a motor controller with software that is predictable and customizable. A Graphical User Interface (GUI) was developed to help control the motor and evaluate the speed, torque, current and voltage readings from the motor. The GUI included numerical information and an oscilloscope for visual reference. The information collected from the GUI can be exported to an excel file and evaluated. The fine tuning of a PID motor control system requires knowledge of the inductance and resistance of the motor. The inductance and resistance of several different permanent magnet synchronous motors (PMSM) were measured using a laboratory grade Inductance, Capacitance and Resistance (LCR) meter. LCR values used in a comparative study with motor control software with built in automatic parameter identification software in the input for validation. The information gathered from evaluations like these will give a better understanding towards the development of electric and hybrid-electric air vehicles.