EPE Association: EPE 2017 - LS3d: SynRM Drive Topics

EPE 2017 - LS3d: SynRM Drive Topics
You are here: EPE Documents > 01 - EPE & EPE ECCE Conference Proceedings > EPE 2017 ECCE Europe - Conference > EPE 2017 - Topic 04: Electrical Machines and Drive Systems > EPE 2017 - LS3d: SynRM Drive Topics

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   Fault-tolerant, multilevel converter topology for switched reluctance machines
By Jacek BORECKI [View]
[Download]

Abstract: The following paper presents new fault tolerant converter topology for switched reluctance machines, that features multilevel output along with its advantages. The principle of operation in normal as well as in the fault conditions are described. Previously proposed modulation strategy including DC bus voltage balancing scheme is applied and tested in measurements. Low cost, discrete implementation of the NPC asymmetric bridge converter including the measurement results are presented. The measurements prove basic functionality of the new converter topology and at the same time the viability of such a implementation. Furthermore, semiconductor power losses comparison with conventional asymmetric bridge converter is carried out through simulation. The results of power losses analysis show that an converter with multilevel output and inherent fault tolerance does not have to dramatically decrease the overall efficiency. Moreover, power losses distribution show that there is a lot of space for further optimization of the converter. The optimization can be done throughout modifications of the modulation scheme as well as proper component selection.

   FPGA-based High Dynamic Servo Drive Control with a 200 kHz Gallium Nitride Inverter
By Franz STUBENRAUCH [View]
[Download]

Abstract: Increased productivity in industrial processes can be achieved by dynamic and accurate positioning ofservo drives. Therefore, improvement of servo drive dynamics using latest technologies in the keycomponents such as inverter, control system and position measuring device are investigated. UsingGallium Nitride (GaN) or Silicon Carbide (SiC) semiconductors for motor inverters enables energyefficient operation up to pulse width modulation (PWM) frequencies of 500 kHz. This allows motorfilters with small component sizes. As a result, high motor efficiency, low torque ripple, high controlbandwidth and almost ideal sinusoidal output voltages are achieved. Experiments on a 200 kHzGallium Nitride inverter with sine wave motor filter show a current control loop bandwidth of 3.2 kHzand almost ideal sinusoidal phase voltages. The achieved bandwidths of the speed and position controlloops are 318 Hz and 106 Hz, respectively.

   Optimization of a Synchronous Reluctance Machine for an Industrial Drive Application Regarding to Sensorless Control
By Matthias HOFER [View]
[Download]

Abstract: In this paper synchronous reluctance machine topologies for an industrial drive application are investigatedregarding to sensorless control and regarding to the flux weakening operation. An inductionmachine drive shall be replaced by a synchronous reluctance machine because of lower machine costsand the possibility of sensorless control. The induction machine stator is intended to be equipped withthe SynRM rotor to provide a modular machine concept. Two different rotor types, a flux barrier and asalient pole machine topology are discussed. By finite element simulation methods both machine typesare designed for a possible operation in flux weakening range with low harmonics. The flux barrier rotorwas already built up as machine prototype and was operated by a position sensorless control. Based onthis implementation key requirements for the optimization of a salient pole machine are identified. Toovercome drawbacks of the salient machine topology several design measures like rotor skewing, statorcoil pitching, rotor pole shaping and unequal pole angles are considered. Finally, a salient pole machinedesign with low harmonics is reached which is expected to be well operated in deep flux weakeningrange. However, the final design shows a lower torque compared to the flux barrier machine.

   Voltage Square-Wave-Injection-based HF Parameter Identification Method for Sensorless Control of a Synchronous Reluctance Machine
By Martha BUGSCH [View]
[Download]

Abstract: For sensorless control at zero or low speed, extending the bandwidth by higher HF signal-injection frequencies is desirable. Therefore, knowledge of the HF machine parameters for the electrical angle calculation is necessary. Conventional methods to determine the HF machine parameters using sinusoidalsignals reach their limits using a standard industrial converter. The restricted switching frequency limitsthe possible number of voltage steps for sinusoidal-shaped signals of higher frequencies. Moreover, thesampling frequency to reconstruct the current signal also is limited without current oversampling.An alternative and simultaneously simplified signal shape to avoid these limitations is a square-wave-shapedvoltage signal. This kind of signal, in contrast to approximately sinusoidal-shaped signals, containsa different amount of higher harmonics if it is realised via pulse-width modulation. Thus, it is notrecommended to use HF machine parameters that are measured with sinusoidal-signal injection even ifthe same frequency would be possible. Hence, a new method needs to be developed to measure the HFmachine parameters for this signal shape and HF frequency under the restrictions of a standard industrialconverter.This paper proposes a method to estimate the time-discrete transfer function between these square-wave-shaped voltage signal and the resulting current response with a least-square estimation method. A timesynchronous averaging algorithm is implemented to reduce the measurement noise of the sampled currentvalues. As a result, the HF admittances necessary for electrical angle estimation can be calculated.Measurement results are also presented.

EPE 2017 - LS3d: SynRM Drive Topics
You are here: EPE Documents > 01 - EPE & EPE ECCE Conference Proceedings > EPE 2017 ECCE Europe - Conference > EPE 2017 - Topic 04: Electrical Machines and Drive Systems > EPE 2017 - LS3d: SynRM Drive Topics
	[return to parent folder]

	Fault-tolerant, multilevel converter topology for switched reluctance machines By Jacek BORECKI	[View] [Download]
Abstract: The following paper presents new fault tolerant converter topology for switched reluctance machines, that features multilevel output along with its advantages. The principle of operation in normal as well as in the fault conditions are described. Previously proposed modulation strategy including DC bus voltage balancing scheme is applied and tested in measurements. Low cost, discrete implementation of the NPC asymmetric bridge converter including the measurement results are presented. The measurements prove basic functionality of the new converter topology and at the same time the viability of such a implementation. Furthermore, semiconductor power losses comparison with conventional asymmetric bridge converter is carried out through simulation. The results of power losses analysis show that an converter with multilevel output and inherent fault tolerance does not have to dramatically decrease the overall efficiency. Moreover, power losses distribution show that there is a lot of space for further optimization of the converter. The optimization can be done throughout modifications of the modulation scheme as well as proper component selection.

	FPGA-based High Dynamic Servo Drive Control with a 200 kHz Gallium Nitride Inverter By Franz STUBENRAUCH	[View] [Download]
Abstract: Increased productivity in industrial processes can be achieved by dynamic and accurate positioning ofservo drives. Therefore, improvement of servo drive dynamics using latest technologies in the keycomponents such as inverter, control system and position measuring device are investigated. UsingGallium Nitride (GaN) or Silicon Carbide (SiC) semiconductors for motor inverters enables energyefficient operation up to pulse width modulation (PWM) frequencies of 500 kHz. This allows motorfilters with small component sizes. As a result, high motor efficiency, low torque ripple, high controlbandwidth and almost ideal sinusoidal output voltages are achieved. Experiments on a 200 kHzGallium Nitride inverter with sine wave motor filter show a current control loop bandwidth of 3.2 kHzand almost ideal sinusoidal phase voltages. The achieved bandwidths of the speed and position controlloops are 318 Hz and 106 Hz, respectively.

	Optimization of a Synchronous Reluctance Machine for an Industrial Drive Application Regarding to Sensorless Control By Matthias HOFER	[View] [Download]
Abstract: In this paper synchronous reluctance machine topologies for an industrial drive application are investigatedregarding to sensorless control and regarding to the flux weakening operation. An inductionmachine drive shall be replaced by a synchronous reluctance machine because of lower machine costsand the possibility of sensorless control. The induction machine stator is intended to be equipped withthe SynRM rotor to provide a modular machine concept. Two different rotor types, a flux barrier and asalient pole machine topology are discussed. By finite element simulation methods both machine typesare designed for a possible operation in flux weakening range with low harmonics. The flux barrier rotorwas already built up as machine prototype and was operated by a position sensorless control. Based onthis implementation key requirements for the optimization of a salient pole machine are identified. Toovercome drawbacks of the salient machine topology several design measures like rotor skewing, statorcoil pitching, rotor pole shaping and unequal pole angles are considered. Finally, a salient pole machinedesign with low harmonics is reached which is expected to be well operated in deep flux weakeningrange. However, the final design shows a lower torque compared to the flux barrier machine.

	Voltage Square-Wave-Injection-based HF Parameter Identification Method for Sensorless Control of a Synchronous Reluctance Machine By Martha BUGSCH	[View] [Download]
Abstract: For sensorless control at zero or low speed, extending the bandwidth by higher HF signal-injection frequencies is desirable. Therefore, knowledge of the HF machine parameters for the electrical angle calculation is necessary. Conventional methods to determine the HF machine parameters using sinusoidalsignals reach their limits using a standard industrial converter. The restricted switching frequency limitsthe possible number of voltage steps for sinusoidal-shaped signals of higher frequencies. Moreover, thesampling frequency to reconstruct the current signal also is limited without current oversampling.An alternative and simultaneously simplified signal shape to avoid these limitations is a square-wave-shapedvoltage signal. This kind of signal, in contrast to approximately sinusoidal-shaped signals, containsa different amount of higher harmonics if it is realised via pulse-width modulation. Thus, it is notrecommended to use HF machine parameters that are measured with sinusoidal-signal injection even ifthe same frequency would be possible. Hence, a new method needs to be developed to measure the HFmachine parameters for this signal shape and HF frequency under the restrictions of a standard industrialconverter.This paper proposes a method to estimate the time-discrete transfer function between these square-wave-shaped voltage signal and the resulting current response with a least-square estimation method. A timesynchronous averaging algorithm is implemented to reduce the measurement noise of the sampled currentvalues. As a result, the HF admittances necessary for electrical angle estimation can be calculated.Measurement results are also presented.