EPE Association: EPE 2017 - LS4d: Drive Control Classical Issues

EPE 2017 - LS4d: Drive Control Classical Issues
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 - LS4d: Drive Control Classical Issues

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   Analytical computation of the optimal reference currents for MTPC/MTPA, MTPV and MTPF operation of anisotropic synchronous machines considering stator resistanc
By Christoph M. HACKL [View]
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Abstract: The derivation of analytical solutions for the optimal reference currents during Maximum-Torque-per-Current (MTPC; or Maximum-Torque-per-Ampere (MTPA)), Maximum-Torque-per-Voltage (MTPV)and Maximum-Torque-per-Flux (MTPF) operation of anisotropic synchronous machines with non-negli-gible stator resistance and mutual inductance is presented. The analytical solutions allow for a directcomputation of the corresponding reference currents without neglecting stator resistance and/or mutualinductance (as usually done). Numerical approximations are no longer required. The derived analyticalsolutions for MTPC, MTPV and MTPF operation are suitable for any anisotropic synchronous machine;even for nonlinear reluctance synchronous machines as measurement will illustrate.

   Control of Variable Speed Drives with Compliant Shaft Loads using Local Vector Control
By ROBERT BETZ [View]
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Abstract: Most control papers related to variable speed drives are focused on the current and torque control of the electric machine. However, the slower outer loop is also very important. This considers the control of a variable parameter resonant rotating load using a novel control algorithm called Local Vector Control (LVC). Resonant loads naturally occur in, for example, building elevator applications. The LVC algorithm is able to control this difficult load even under varying parameter conditions without any change to the controller. Simulation and experimental results are presented.

   Estimating the Orientation Error with Injected Test Signals for Sensorless Field Oriented Control of Induction Machines Using Magnetic Anisotropies
By Henning SAUERLAND [View]
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Abstract: A method for sensorless control of induction machines is proposed to estimate the field angle error using continuous excitation signals. Effects, which are present during a misalignment between the real world and model value, are used to estimate the error and correct it.Main flux oriented machine model equations, which take into account the magnetic anisotropies of the machine, are used to show the effect of a mismatch between the real and the model angle. These equations are simplified to only show the relevant terms in respect to high frequency test signals. By this it is possible to estimate the expected amplitude of injected test signals with greatly reduced computational effort. Simulation results are presented to show the validity of these assumptions.With the effects of an orientation error on a test signal described, a way to correct this error is discussed. For this, test signal components are extracted and used in a simple, but effective, control structure to minimize the error. By this it is also possible to estimate the main-flux angle of the machine. Simulation results are presented to show the performance of this method.Measurements on a test bench were carried out to show that these effects can be used in a practical application and also to validate the proposed method. This is done for standstill and with low rotor speeds.

   Impact of Amplifier Errors on Position Loop Accuracy of High-Precision Moving Stages
By Sjef SETTELS [View]
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Abstract: To maximise essential system performance parameters, this research combines electrical, mechanical andposition control models of a high-precision mechatronic system. The degradation of system performanceinduced by identified amplifier errors is analysed to reveal the significance of each error mechanism. Thesimplified outline of a mechatronic system is given to which models of the power amplifier are addedin order to emulate the error mechanisms. Analysis of the impact of each error mechanism on theposition accuracy of the mechatronic system is given from which specifications for the power amplifiercan be obtained for a certain required position accuracy. Ensuing properly targeted requirements providefocused amplifier optimisation.

EPE 2017 - LS4d: Drive Control Classical Issues
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 - LS4d: Drive Control Classical Issues
	[return to parent folder]

	Analytical computation of the optimal reference currents for MTPC/MTPA, MTPV and MTPF operation of anisotropic synchronous machines considering stator resistanc By Christoph M. HACKL	[View] [Download]
Abstract: The derivation of analytical solutions for the optimal reference currents during Maximum-Torque-per-Current (MTPC; or Maximum-Torque-per-Ampere (MTPA)), Maximum-Torque-per-Voltage (MTPV)and Maximum-Torque-per-Flux (MTPF) operation of anisotropic synchronous machines with non-negli-gible stator resistance and mutual inductance is presented. The analytical solutions allow for a directcomputation of the corresponding reference currents without neglecting stator resistance and/or mutualinductance (as usually done). Numerical approximations are no longer required. The derived analyticalsolutions for MTPC, MTPV and MTPF operation are suitable for any anisotropic synchronous machine;even for nonlinear reluctance synchronous machines as measurement will illustrate.

	Control of Variable Speed Drives with Compliant Shaft Loads using Local Vector Control By ROBERT BETZ	[View] [Download]
Abstract: Most control papers related to variable speed drives are focused on the current and torque control of the electric machine. However, the slower outer loop is also very important. This considers the control of a variable parameter resonant rotating load using a novel control algorithm called Local Vector Control (LVC). Resonant loads naturally occur in, for example, building elevator applications. The LVC algorithm is able to control this difficult load even under varying parameter conditions without any change to the controller. Simulation and experimental results are presented.

	Estimating the Orientation Error with Injected Test Signals for Sensorless Field Oriented Control of Induction Machines Using Magnetic Anisotropies By Henning SAUERLAND	[View] [Download]
Abstract: A method for sensorless control of induction machines is proposed to estimate the field angle error using continuous excitation signals. Effects, which are present during a misalignment between the real world and model value, are used to estimate the error and correct it.Main flux oriented machine model equations, which take into account the magnetic anisotropies of the machine, are used to show the effect of a mismatch between the real and the model angle. These equations are simplified to only show the relevant terms in respect to high frequency test signals. By this it is possible to estimate the expected amplitude of injected test signals with greatly reduced computational effort. Simulation results are presented to show the validity of these assumptions.With the effects of an orientation error on a test signal described, a way to correct this error is discussed. For this, test signal components are extracted and used in a simple, but effective, control structure to minimize the error. By this it is also possible to estimate the main-flux angle of the machine. Simulation results are presented to show the performance of this method.Measurements on a test bench were carried out to show that these effects can be used in a practical application and also to validate the proposed method. This is done for standstill and with low rotor speeds.

	Impact of Amplifier Errors on Position Loop Accuracy of High-Precision Moving Stages By Sjef SETTELS	[View] [Download]
Abstract: To maximise essential system performance parameters, this research combines electrical, mechanical andposition control models of a high-precision mechatronic system. The degradation of system performanceinduced by identified amplifier errors is analysed to reveal the significance of each error mechanism. Thesimplified outline of a mechatronic system is given to which models of the power amplifier are addedin order to emulate the error mechanisms. Analysis of the impact of each error mechanism on theposition accuracy of the mechatronic system is given from which specifications for the power amplifiercan be obtained for a certain required position accuracy. Ensuing properly targeted requirements providefocused amplifier optimisation.