A modified PWM scheme in order to obtain spatial information of AC machines without mechanical sensor

Wolbank, T.M.; Machl, J.L.

doi:10.1109/apec.2002.989264

Cited by 39 publications

(33 citation statements)

References 10 publications

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“…High or medium bandwidth estimation capability Two current sensors Measurement of DC bus voltage Varying load inertia From these criteria the following schemes where selected: Rotating High Frequency Carrier Injection (HFCI-R) [2,13,39], Pulsating High Frequency Carrier Injection (HFCI-P) [3,26] and Transient based excitation (TE) [1,7]. In order to make a direct comparison the Transient based Excitation scheme was modified to a new scheme where the position could be estimated in every switching period.…”

Section: Project Overviewmentioning

confidence: 99%

“…The scheme is based on [1,7] and a position estimate is generated in every switching period. A modified scheme applies the transient excitation in intervals in order to evaluate the performance with lower switching losses.…”

Section: Overview Of Chaptersmentioning

confidence: 99%

“…This modification reduced the audio noise and additional losses in the machine. In [7] Wolbank and Machl integrated the excitation sequence in the zero vector (symmetrical space vector modulation). The performance (or operation) of this excitation schemes was not showed in [7].…”

Section: Transient Excitationmentioning

confidence: 99%

“…As the publications uses different test criteria it is challenging to determine the characteristics for the different schemes: three different control schemes are evaluated in terms of determining the scheme characteristics. A new scheme based on [1,7] is presented in this thesis. The new scheme enables integration of transient excitation and position estimation in every switching period.…”

Section: Introductionmentioning

confidence: 99%

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Sensorless control of permanent magnet synchronous machines

Øvrebø¹

2013

IECON 2013 - 39th Annual Conference of the IEEE Industrial Electronics Society

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As the cost for permanent magnets are decreasing and the quality of the magnets are increasing the Permanent Magnet Synchronous Machine (PMSM) are becoming more popular. The PMSM is superior to induction machines both in torque per kilograms and efficiency. Typical applications for these machines are applications where machine volume or efficiency is important. In order to control a PMSM the rotor position needs to be known. This can be obtained by usage of sensor or by usage of a sensorless control scheme. Sensorless Control schemes typically divide into two categories; schemes that give good controllability from 2-5 Hz and schemes that gives good controllability at all speeds including zero speed. The focus for this thesis is sensorless control schemes with good controllability at low and zero speeds. Sensorless control is a multi physics challenge where the machine, inverter and control scheme are equally important for the quality of the drive system. In order to describe the saliency in the machine a new saliency machine model is developed in this thesis. The model includes yoke saturation, teeth saturation and induced currents in magnets. In injection based sensorless control the high frequency flux distribution in the machine is of great interest. In this thesis the frequency dependency in inductance is estimated in two machines by using injection of test signals in a large frequency range. Based on the measurements and the new saliency model the high frequency flux distribution is estimated and the frequency dependency of the saliency is described. A variety of different sensorless schemes are published over the last two decades. As the publications uses different test criteria it is challenging to determine the characteristics for the different schemes: three different control schemes are evaluated in terms of determining the scheme characteristics. A new scheme based on [1,7] is presented in this thesis. The new scheme enables integration of transient excitation and position estimation in every switching period. The continuous injection based schemes evaluated in this work is rotating high frequency carrier injection [2,13,39] and pulsating high frequency carrier injection [3,26]. The different schemes sensitivity to the inverter non linearity is modelled and evaluated. A comparison of the three schemes is presented. Surface mounted PMSM typically has a small saliency. The saliency in a surface mounted PMSM can be increased in several ways. The last part of this thesis presents a redesign approach for an axial flux PMSM. Several approaches are evaluated in terms of synergy effects with the machine cost and performance. An approach based on insertion of semi-magnetic slot wedges are realised in a prototype. iv ACKNOWLEDGMENTS

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Section: Project Overviewmentioning

confidence: 99%

Section: Overview Of Chaptersmentioning

confidence: 99%

Section: Transient Excitationmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

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Sensorless control of permanent magnet synchronous machines

Øvrebø¹

2013

IECON 2013 - 39th Annual Conference of the IEEE Industrial Electronics Society

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“…However, these approaches require a high frequency (HF) signal (in addition to the fundamental waveform) to be applied to the machine. The HF waveform can be added either as a signal to the vector control demands prior to calculating the PWM pulses and timings (so called high frequency injection) [7][8][9][10][11], or by manipulating slightly the inverter switching edges themselves [12][13][14][15]. The addition of HF content to the fundamental waveform brings undesirable consequences such as torque ripple, audible noise, vibration, increased current total harmonic distortion (THD) and voltage limitations on the inverter.…”

Section: Introductionmentioning

confidence: 99%

Use of optical fibres for multi-parameter monitoring in electrical AC machines

Hind

Gerada

Galea

et al. 2017

2017 IEEE 11th International Symposium on Diagnostics for Electrical Machines, Power Electronics and Drives (SDEMPED)

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Improved sensorless control of a permanent magnet machine using fundamental pulse width modulation excitation

Hua

Sumner

Asher

et al. 2011

IET Electr. Power Appl.

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A new method to estimate the rotor position of permanent magnet synchronous motor (PMSM) drives over a wide speed range, including zero frequency is introduced. The method measures the motor current derivative in response to the standard pulse width modulation (PWM) sequence to estimate rotor position. No additional signal injection or separate test vectors are required although modification is needed when narrow PWM voltage vectors occur. Three compensation techniques are proposed to improve the quality of the position estimation and reduce current distortion when narrow vectors are used for position estimation. Experimental results for sensorless speed and position control of a 4 kW PMSM verify the effectiveness of the proposed techniques.

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A modified PWM scheme in order to obtain spatial information of AC machines without mechanical sensor

Cited by 39 publications

References 10 publications

Sensorless control of permanent magnet synchronous machines

Sensorless control of permanent magnet synchronous machines

Use of optical fibres for multi-parameter monitoring in electrical AC machines

Improved sensorless control of a permanent magnet machine using fundamental pulse width modulation excitation

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