EPE Association: EPE 2003 - Topic 07b: Measurements Techniques

EPE 2003 - Topic 07b: Measurements Techniques
You are here: EPE Documents > 01 - EPE & EPE ECCE Conference Proceedings > EPE 2003 - Conference > EPE 2003 - Topic 07: MEASUREMENTS AND SENSORS > EPE 2003 - Topic 07b: Measurements Techniques

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   Isolated current probe for continuous monitoring of AC currents of high amplitude and high frequency
By N. Karrer; P. Hofer-Noser; G. Herdrich; M. Auweter-Kurtz

Abstract: Inductively heated plasma generators work with high-amplitude and high-frequency AC currents. Conventional current probes allow only short-time monitoring due to internal heat dissipation. The presented probe is electrically isolated from the main current and does not overheat when monitoring such currents. Continuous current measurements were performed with the new probe at a frequency of nearly 1 MHz and 1 kA peak current. Comparative measurements are presented to demonstrate the performance of the new HOKA-AC probe.

   Sensorless position measurement of switched reluctance drives at lower speed
By J. Hildinger; M. Hiller; R. Marquardt [View]
[Download]

Abstract: A new rotor position measurement method for Switched Reluctance Drives (SRD) is introduced. It is based on terminal measurements of phase voltage and current using passive sensors. The new, digitally implemented concept provides precise position information for the lower speed range in motor and generator operation (including standstill). Taking into account all sources of measurement errors leads to a high precision performance, so that – combined with known systems for the higher speed range – conventional shaft resolvers or encoders can be replaced.

   Systematic error correction methods for sinusoidal encoders and their application in servo control
By A. Baehr; P. Mutschler [View]
[Download]

Abstract: In this paper, methods to identify and correct systematic errors of high-resolution optical sinusoidal encoders are discussed. Three methods are resumed, focusing on implementation issues, such as suitable identification data and parameters. Comparative experimental results are shown for off-line and on-line (control loop) performance.

   Electrical motor local resonances detection using external magnetic field measurements
By A. Henneton; D. Roger [View]
[Download]

Abstract: This paper shows that magnetic field signature in the vicinity of an inverter fed AC machine contains high frequency components tied to winding resonances. For high frequencies, shielding effect of magnetic stator becomes lower. External radial magnetic field exists and is directly tied to HF current components in slots. End winding connections are not the unique radiation source. This paper proposes an experimental approach by creating a controlled local resonance in order to get correlation between this phenomena and external magnetic field. An analytical model of the magnetic stator HF behaviour is also presented.

   Quantification of switching loss contributions in synchronous rectifier applications
By T. Tolle; T. Duerbaum; R. Elferich; T. Lopez [View]
[Download]

Abstract: For the Synchronous Buck converter used in VRM applications, one major contributor to switching losses is reverse recovery. These losses however cannot directly be measured because capacitive current and several other phenomena superimpose the mere reverse recovery. The paper describes how to calculate the capacitive part of the drain current and how to de-embed the channel current out of the total drain current. This can show the size of Qrr and reveal effects such as gate bouncing and avalanche breakdown.

   Measuring electrical power components
By J. Doval-Gandoy; J. Marcos; A. Nogueiras; A. Lago; C. Peñalver [View]
[Download]

Abstract: Measurement of electrical power components have been studied by several authors. Advances in power electronics have introduced a diverse environment where non-linear loads are common. These non-linear loads introduce harmonic distortion, which invalidates some measurement techniques that consider sinusoidal operation. This paper proposes a methodology for measuring components of electrical power using digital oscilloscopes. Examples are provided for validating the adequacy of the method.

   Measurement system of new electric energy quality factors of power converters
By M.A. Gnatenko; S.A. Kharitonov; V.I. Popov; G.S. Zinoviev; H. Weiss [View]
[Download]

Abstract: A Personal Computer (PC) complex is developed for measurement of the quality of electric energy in the correlation with international and Russia standards. The system works on IBM compatible PCs under operation system WINDOWS 98. The complex computes a set of new quality factors of electric energy and therefore requires a high amount of computation power. The interface component is realized on basis of a micro-controller data acquisition and computation unit in a extremely costeffective form. This interface measures line signals and transfers the preliminary results into a PC for storage and post-processing. For a fast system operation check and a rapid prototype realization, the development environment with a high-priced DSP system (dSpace®) which is programmable by means of MathLab® is a choice. If a special calibrated system is required commercial industry standard PCs can be used with integrated difference amplifiers with settable or programmable gain and e.g. NI® A/D cards for data acquisition in universal measurement applications.

   AC and DC transformer-transductor transducer
By S. Moskowicz [View]
[Download]

Abstract: The structure and testing results of the AC and DC transformer-transductor transducer are presented. It has two toroidal permalloy cores: a conventional one for AC and that for DC of special design. The transducer operates in an automatic comparing circuit.

EPE 2003 - Topic 07b: Measurements Techniques
You are here: EPE Documents > 01 - EPE & EPE ECCE Conference Proceedings > EPE 2003 - Conference > EPE 2003 - Topic 07: MEASUREMENTS AND SENSORS > EPE 2003 - Topic 07b: Measurements Techniques
	[return to parent folder]

	Isolated current probe for continuous monitoring of AC currents of high amplitude and high frequency By N. Karrer; P. Hofer-Noser; G. Herdrich; M. Auweter-Kurtz
Abstract: Inductively heated plasma generators work with high-amplitude and high-frequency AC currents. Conventional current probes allow only short-time monitoring due to internal heat dissipation. The presented probe is electrically isolated from the main current and does not overheat when monitoring such currents. Continuous current measurements were performed with the new probe at a frequency of nearly 1 MHz and 1 kA peak current. Comparative measurements are presented to demonstrate the performance of the new HOKA-AC probe.

	Sensorless position measurement of switched reluctance drives at lower speed By J. Hildinger; M. Hiller; R. Marquardt	[View] [Download]
Abstract: A new rotor position measurement method for Switched Reluctance Drives (SRD) is introduced. It is based on terminal measurements of phase voltage and current using passive sensors. The new, digitally implemented concept provides precise position information for the lower speed range in motor and generator operation (including standstill). Taking into account all sources of measurement errors leads to a high precision performance, so that – combined with known systems for the higher speed range – conventional shaft resolvers or encoders can be replaced.

	Systematic error correction methods for sinusoidal encoders and their application in servo control By A. Baehr; P. Mutschler	[View] [Download]
Abstract: In this paper, methods to identify and correct systematic errors of high-resolution optical sinusoidal encoders are discussed. Three methods are resumed, focusing on implementation issues, such as suitable identification data and parameters. Comparative experimental results are shown for off-line and on-line (control loop) performance.

	Electrical motor local resonances detection using external magnetic field measurements By A. Henneton; D. Roger	[View] [Download]
Abstract: This paper shows that magnetic field signature in the vicinity of an inverter fed AC machine contains high frequency components tied to winding resonances. For high frequencies, shielding effect of magnetic stator becomes lower. External radial magnetic field exists and is directly tied to HF current components in slots. End winding connections are not the unique radiation source. This paper proposes an experimental approach by creating a controlled local resonance in order to get correlation between this phenomena and external magnetic field. An analytical model of the magnetic stator HF behaviour is also presented.

	Quantification of switching loss contributions in synchronous rectifier applications By T. Tolle; T. Duerbaum; R. Elferich; T. Lopez	[View] [Download]
Abstract: For the Synchronous Buck converter used in VRM applications, one major contributor to switching losses is reverse recovery. These losses however cannot directly be measured because capacitive current and several other phenomena superimpose the mere reverse recovery. The paper describes how to calculate the capacitive part of the drain current and how to de-embed the channel current out of the total drain current. This can show the size of Qrr and reveal effects such as gate bouncing and avalanche breakdown.

	Measuring electrical power components By J. Doval-Gandoy; J. Marcos; A. Nogueiras; A. Lago; C. Peñalver	[View] [Download]
Abstract: Measurement of electrical power components have been studied by several authors. Advances in power electronics have introduced a diverse environment where non-linear loads are common. These non-linear loads introduce harmonic distortion, which invalidates some measurement techniques that consider sinusoidal operation. This paper proposes a methodology for measuring components of electrical power using digital oscilloscopes. Examples are provided for validating the adequacy of the method.

	Measurement system of new electric energy quality factors of power converters By M.A. Gnatenko; S.A. Kharitonov; V.I. Popov; G.S. Zinoviev; H. Weiss	[View] [Download]
Abstract: A Personal Computer (PC) complex is developed for measurement of the quality of electric energy in the correlation with international and Russia standards. The system works on IBM compatible PCs under operation system WINDOWS 98. The complex computes a set of new quality factors of electric energy and therefore requires a high amount of computation power. The interface component is realized on basis of a micro-controller data acquisition and computation unit in a extremely costeffective form. This interface measures line signals and transfers the preliminary results into a PC for storage and post-processing. For a fast system operation check and a rapid prototype realization, the development environment with a high-priced DSP system (dSpace®) which is programmable by means of MathLab® is a choice. If a special calibrated system is required commercial industry standard PCs can be used with integrated difference amplifiers with settable or programmable gain and e.g. NI® A/D cards for data acquisition in universal measurement applications.

	AC and DC transformer-transductor transducer By S. Moskowicz	[View] [Download]
Abstract: The structure and testing results of the AC and DC transformer-transductor transducer are presented. It has two toroidal permalloy cores: a conventional one for AC and that for DC of special design. The transducer operates in an automatic comparing circuit.