Voltage distribution in the windings of high temperature inverter-fed motors
| Autor: | Daniel Roger, Ewa Napieralska-Juszczak |
|---|---|
| Rok vydání: | 2018 |
| Předmět: |
010302 applied physics
Physics Stator business.industry Applied Mathematics 020208 electrical & electronic engineering Electrical engineering 02 engineering and technology Earthing system 01 natural sciences Computer Science Applications law.invention Computational Theory and Mathematics Parasitic capacitance law Electromagnetic coil 0103 physical sciences 0202 electrical engineering electronic engineering information engineering Voltage spike Equivalent circuit Electrical and Electronic Engineering business Pulse-width modulation Voltage |
| Zdroj: | COMPEL - The international journal for computation and mathematics in electrical and electronic engineering. 37:1824-1836 |
| ISSN: | 0332-1649 |
| DOI: | 10.1108/compel-01-2018-0024 |
| Popis: | Purpose High-temperature (HT°) motors are made with inorganic coils wound with a ceramic-coated wire. They must be carefully designed because the HT° insulating materials have a lower breakdown voltages than the polymers used for insulating standard machines. Design/methodology/approach The voltage distribution between stator coils is computed with high-frequency (HF) equivalent circuits that consider the magnetic couplings and the stray capacitances. Two time scales are used for getting a fast computation of very short voltage spikes. For the first step, a medium time scale analysis is performed considering a simplified equivalent circuit made without any stray capacitance but with the full PWM pattern and the magnetic couplings. For the second step, a more detailed HF equivalent circuit computes voltage spikes during short critical time windows. Findings The computation made during the first step provides the critical time windows and the initial values of the state variables to the second one. The rise and fall time of the electronic switches have a minor influence on the maximum voltage stress. Conversely, the connection cable length and the common-mode capacitances have a large influence. Research limitations/implications HF equivalent circuits cannot be used with random windings but only to formed coils that have a deterministic position of turns. Practical implications The proposed method can be used designing of HT° machine windings fed by PWM inverter and for improving the coils of standard machine used in aircraft’s low-pressure environments. Originality/value The influence of grounding system of the DC link is considered for computing the voltage spikes in the motor windings. |
| Databáze: | OpenAIRE |
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