Thike, Rajendra (2016) A Vector Controlled Drive for Parameter Evaluation of Variable Flux Machines. Masters thesis, Concordia University.
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Abstract
Variable flux machine is a new class of permanent magnet machines that combine the flux controllability in wound field synchronous machines, and the high efficiency due to permanent magnets. An AlNiCo based variable flux machine whose air-gap flux is varied by applying a direct axis current pulse is considered in this work.
This thesis reviews the dq model of permanent magnet machines, which is then modified to account for flux controllability in variable flux machines. The existing inductance measurement methods are analyzed, and a vector control technique that is fast in the measurement of current dependent inductances at various magnetization level is proposed. The accuracy of the method is assessed by comparing it with the flux linkage calculation method.
The variable flux machines are designed with small air-gap lengths to reduce the magnet thickness and the magnetization current. Due to this reason, saturation and cross-magnetization effects causes changes in the flux produced by one coil, when current in other coil is changed and vice versa. If the cross-magnetization effects are neglected, accurate control of the magnet flux would require a slower current controller. This would need a longer duration pulse to change the magnetization level. The longer the pulse duration, the more severe is the torque ripple. For high-performance drives, consideration of cross-magnetization effects is required. Therefore, this thesis proposes a vector controlled technique to evaluate the cross-magnetization effects in variable flux machines. The proposed technique is able to measure the self and cross-coupled inductances at any magnetization level using an existing drive. The dq model of variable flux machine is then modified to account for the cross-magnetization effects.
The cross-coupled inductances are used to evaluate the static torque-angle characteristics of the machine. Two methods using the vector control technique are presented to experimentally measure the static torque-angle characteristics. The benefit of using a vector control drive is that the effects of heating and unequal phase resistances are taken care automatically. The measured torque-angle characteristics are compared with the calculated and finite element method simulation ones. Finally, the same vector control technique is used to evaluate the torque ripple performance of the VFM. This technique is not only useful in evaluating the designed machine, but it is also useful to evaluate design software.
| Divisions: | Concordia University > Gina Cody School of Engineering and Computer Science > Electrical and Computer Engineering |
|---|---|
| Item Type: | Thesis (Masters) |
| Authors: | Thike, Rajendra |
| Institution: | Concordia University |
| Degree Name: | M.A. Sc. |
| Program: | Electrical and Computer Engineering |
| Date: | November 2016 |
| Thesis Supervisor(s): | Pillay, Pragasen |
| Keywords: | Variable flux machine, vector controlled drive, inductance measurement, cross-magnetization effects, torque-ripple measurement |
| ID Code: | 982005 |
| Deposited By: | RAJENDRA THIKE |
| Deposited On: | 09 Jun 2017 14:22 |
| Last Modified: | 01 Nov 2018 00:00 |
| Additional Information: | This thesis explored the use of a vector controlled drive to characterize the variable flux machine. The techniques developed are equally useful for regular permanent magnet machines and synchronous reluctance machines. The same drive to control the machine is used to measure the inductances, cross-coupling effects, torque-angle curves, and torque ripple. The techniques are useful in characterizing a new machine or, evaluating the design software by comparing design simulation with the experimental results. |
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