scispace - formally typeset
Search or ask a question
Topic

Thyristor drive

About: Thyristor drive is a research topic. Over the lifetime, 3155 publications have been published within this topic receiving 37602 citations.


Papers
More filters
Journal ArticleDOI
TL;DR: In this article, a new approach to medium-voltage variable-frequency static AC motor drives was proposed to improve the power quality of the motor by improving motor voltage and current waveforms.
Abstract: A new approach to medium-voltage variable-frequency static AC motor drives offers improvements in power quality. Harmonic current injection into the power lines is below the most severe requirements of IEEE Standard 519-1992. The power factor of this new type of drive exceeds 94% at full load and is above 90% at 10% load. Motor voltage and current waveforms are improved so that torque pulsations are reduced. Peak voltage stress on motor insulation does not exceed peak input line voltage, and no zero sequence voltage is imposed. Drive efficiency exceeds 96%. This paper describes the new approach and some of the results achieved.

841 citations

Journal ArticleDOI
TL;DR: The application of vector control to the PMSM (permanent-magnet synchronous motor) is described, and complete modeling, simulation, and analysis of the drive system are presented.
Abstract: The application of vector control to the PMSM (permanent-magnet synchronous motor) is described, and complete modeling, simulation, and analysis of the drive system are presented. State-space models of the motor and speed controller and real-time models of the inverter switches and vector controller are included. Performance differences due to the use of pulsewidth-modulation (PWM) and hysteresis current controllers are also examined. Particular attention is paid to the motor torque pulsations and speed response. Some experimental verification of the drive performance is also given. >

804 citations

Patent
30 Nov 1992
TL;DR: In this article, a motor drive unit for use in conjunction with an atherectomy device which limits the torque exerted on a drive cable for rotating a cutting blade in the device is described.
Abstract: The invention provides a motor drive unit for use in conjunction with an atherectomy device which limits the torque exerted on a drive cable for rotating a cutting blade in the device. In a preferred embodiment, a motor drive unit includes a motor having a shaft coupled to the drive cable for rotating the cutting blade, a power supply coupled to the motor and a switch for selectively connecting the power supply to the motor. A torque control circuit connected to the power supply and the motor controls the torque exerted by the motor when the switch is closed, whereby the current to the motor is continuously increased from zero to a start-up level, the start-up level being the minimum current sufficient to turn the cutting blade. Usually, the torque control circuit will include a resistor and a capacitor connected to a power supply in parallel with the motor, wherein a gradually decreasing portion of current from the battery is diverted through the RC circuit to charge the capacitor such that the current to the motor is at the start-up level when the capacitor is charged. The motor drive unit further includes a power MOSFET for discharging the capacitor when the switch is opened to reset the circuit.

610 citations

Patent
06 Jun 2006
TL;DR: In this article, an apparatus for controlling the speed of an AC motor comprising a switch adapted to be coupled in parallel with power terminals for the AC motor; a capacitor coupled in series with the parallel combination of the switch and the motor; the capacitor adapted to provide an AC supply voltage from an AC source to the parallel circuit comprising the motor and the switch; and a control circuit for adjusting the conduction time of switch in order to vary the motor speed.
Abstract: An apparatus for controlling the speed of an AC motor comprising a switch adapted to be coupled in parallel with power terminals for the AC motor; a capacitor coupled in series with the parallel combination of the switch and the motor; the capacitor adapted to provide an AC supply voltage from an AC source to the parallel circuit comprising the motor and the switch; and a control circuit for controlling the conduction time of the switch in order to vary the speed of the motor. The switch is preferably pulse-width modulated at a frequency twice the line frequency of the AC supply voltage, and the switch is turned on when the voltage across the AC motor is zero volts. The apparatus is operable to provide for continuously variable control of the motor speed while minimizing acoustic noise in the motor.

610 citations

Journal ArticleDOI
07 Oct 1990
TL;DR: In this paper, a brushless DC motor without a position sensor is described, where variable speed is achieved by adjusting the average motor voltage, just like chopper control of DC motors.
Abstract: A brushless DC motor without a position sensor is described. Variable speed is achieved by adjusting the average motor voltage, just like chopper control of DC motors. The position-sensorless drive proposed is based on detection of the conducting interval of free wheeling diodes connected in antiparallel with power transistors. This approach makes it possible to detect the rotor position over a wide speed range, especially at a lower speed. Experimental results obtained from a prototype brushless DC motor with a rating of 300 W are shown to confirm the validity of the sensorless drive from 45 to 2300 r/min. The starting procedure of the motor is also discussed because it is impossible to detect the rotor position at a standstill. >

451 citations


Network Information
Related Topics (5)
Voltage
296.3K papers, 1.7M citations
83% related
Electric power system
133K papers, 1.7M citations
82% related
Capacitor
166.6K papers, 1.4M citations
80% related
Control system
129K papers, 1.5M citations
80% related
Control theory
299.6K papers, 3.1M citations
79% related
Performance
Metrics
No. of papers in the topic in previous years
YearPapers
20233
20227
20194
20186
201767
201696