DITC-direct instantaneous torque control of switched reluctance drives

Abstract-This paper proposes a method to obtain the rotor position of switched reluctance motors by means of voltage measurements. It is shown that the combination of motor and power-electronic converter defines a resonant circuit, comprised by the motor phase inductances and the parasitic capacitance of converter switches, power cables and motor phase windings. For salient machines in general, the associated resonance frequency of the circuit depends on the rotor position. In the position estimation method, an initial voltage distribution is imposed over the impedances of the resonance circuit, after which the circuit is let to oscillate freely. During this phase of free oscillation, the induced voltage over a phase winding exhibits a damped oscillatory behaviour, from which position information can be retrieved.An overview is given of different possibilities to trigger the voltage resonance. It is shown that the proposed position estimation method has favourable characteristics such as measurement of large-amplitude voltages, robustness against temperature deviations of motor and power semiconductors, very high update rates for the estimated position and absence of sound and disturbance torque. Experimental results are given for a sensorless commutation scheme of a switched reluctance motor under small load.

show abstract

“…At standstill no position estimation is possible. Direct torque control strategies [9] are also based on flux estimation.…”

Section: Introductionmentioning

confidence: 99%

Rotor-Position Estimation of Switched Reluctance Motors Based on Damped Voltage Resonance

Geldhof

Bossche

Melkebeek

2010

IEEE Trans. Ind. Electron.

View full text Add to dashboard Cite

show abstract

“…In contrast to indirect methods, direct instantaneous torque control (DITC) demonstrated in [99], [100] and predictive DITC [101], [102], a PWM version of DITC meant for microprocessor based hardware platforms, offer full flexibility and do not rely on predefined current profiles and commutation waveforms. Torque is estimated online, from a torque observer that uses the measured machine terminal quantities and a machine model (Fig.…”

Section: B Torque Controlmentioning

confidence: 99%

Technology, Research and Applications of Switched Reluctance Drives

et al. 2017

View full text Add to dashboard Cite

Abstract-Electrical drives are one of the major consumers of electrical energy and their penetration in the market is still growing. Hence, for many drive applications efficient, reliable and cost effective solutions have to be found. Switched reluctance drives (SRD) offer a potential solution when focus is mainly on cost and robustness. However, to benefit from the unique advantages of this machine type a deep understanding of its strongly non-linear behavior is required. After discussing some major differences to classic rotating field machines, this paper presents a broad overview of the state of the art of SRD taking into consideration all aspects relevant to machine modeling, design and control development process. Finally, applications on the market utilizing SRDs and the focus of current research is presented. After reading this paper the reader will be able to assess if this modern drive technology could be advantagous in a given application.

show abstract

“…These profiles are, however, calculated offline for constant performance points at a high memory cost in the microcontroller system. In contrast, direct methods use direct instantaneous torque control (DITC) for the direct control of motor instantaneous torque [9,10]. Figure 1 shows the DITC control structure.…”

Section: Introductionmentioning

confidence: 99%

A designed converter for minimizing SRM torque ripple with controlled boost capacitor automatically

Samani¹,

Abdolhamidi²,

Rashidi³

et al. 2016

Turk J Elec Eng & Comp Sci

View full text Add to dashboard Cite

Direct instantaneous torque control (DITC) is one way of controlling torque in switched reluctance motors.Despite the presence of DITC control, torque ripple at nominal or higher speeds is considerable due to the back emf increasing. To overcome this drawback, many converters have been proposed. In most convertors proposed for fast excitation in DITC, controlling of boost capacity is an important problem. This paper presents a DITC for a switched reluctance motor using a proposed converter to reduce the torque ripple with controlled boost capacitor automatically.The proposed converter reduces the torque ripple at rated or higher speeds and no controller requires controlling the boost capacitor. The proposed converter is compared with an asymmetric one via simulation results using MATLAB and experimental results.

show abstract

DITC-direct instantaneous torque control of switched reluctance drives

Cited by 65 publications

References 6 publications

Rotor-Position Estimation of Switched Reluctance Motors Based on Damped Voltage Resonance

Rotor-Position Estimation of Switched Reluctance Motors Based on Damped Voltage Resonance

Technology, Research and Applications of Switched Reluctance Drives

A designed converter for minimizing SRM torque ripple with controlled boost capacitor automatically

Contact Info

Product

Resources

About