Topic

# Torque motor

About: Torque motor is a(n) research topic. Over the lifetime, 7789 publication(s) have been published within this topic receiving 87442 citation(s).

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01 Jan 1998-

TL;DR: This paper presents a space-phasor model of A.C. machines based on artificial intelligence-based steady-state and transient analysis of electrical machines, estimators and investigates the role of magnetic saturation in the control of these machines.

Abstract: 1. Introduction 2. The space-phasor model of A.C. machines 3. Vector and direct torque control of synchronous machines 4. Vector and direct torque control of induction machines 5. Torque control of switched reluctance motors 6. Effects of magnetic saturation 7. Artificial intelligence-based steady-state and transient analysis of electrical machines, estimators 8. Self-commissioning Index

2,300 citations

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22 Jun 1989-

Abstract: Introduction: motion control systems why adjustable speed? structure of drive systems new technology which motor? - the d.c. and PM d.c. commutator motors, the induction motor drive, the brushless d.c. PM and PM a.c. synchronous motors. Part 1 Principles of sizing, gearing and torque production: sizing an electric motor choice of gear ratio in geared drives basic principles of torque production. Part 2 Permanent-magnet materials and circuits: B-H loop and demagnetization characteristics temperature effects - reversible and irreversible losses mechanical properties, handling and magnetization application of permanent magnets in motors. Part 3 Squarewave permanent-magnet brushless motor drives: why brushless d.c.? magnetic circuit analysis on open-circuit squarewave brushless motor - torque and e.m.f. equations torque/speed characteristic - performance and efficiency alternative formulations for torque and e.m.f. motors with 120 degrees and 180 degrees magnet arcs - commutation squarewave motor - winding inductances and armature reaction controllers computer simulation. Part 4 Sinewave permanent-magnet brushless motor drives: ideal sinewave motor - torque, e.m.f. and reactance sinewave motor with practical windings phasor diagram sinewave motor - circle diagram and torque/speed characteristic torque per ampere and kVa/kW of squarewave and sinewave motors permanent magnet versus electromagnetic excitation slotless motors ripple torque in sinewave motors. Part 5 Alternating-current drives with PM and synchronous-reluctance hybrid motors: rotors A.c. windings and inductances steady-state phasor diagram circle diagram and torque-speed characteristic cage-type motors. Part 6 Switched reluctance drives: the switched reluctance motor poles, phases and windings static torque production partition of energy and the effects of saturation dynamic torque production converter circuits control, current regulation, commutation solid rotors.

934 citations

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Abstract: This paper describes an investigation of direct torque control (DTC) for permanent magnet synchronous motor (PMSM) drives. It is mathematically proven that the increase of electromagnetic torque in a permanent magnet motor is proportional to the increase of the angle between the stator and rotor flux linkages, and, therefore, the fast torque response can be obtained by adjusting the rotating speed of the stator flux linkage as fast as possible. It is also shown that the zero voltage vectors should not be used, and stator flux linkage should be kept moving with respect to the rotor flux linkage all the time. The implementation of DTC in the permanent magnet motor is discussed, and it is found that for DTC using available digital signal processors (DSPs), it is advantageous to have a motor with a high ratio of the rated stator flux linkage to stator voltage. The simulation results verify the proposed control and also show that the torque response under DTC is much faster than the one under current control.

871 citations

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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. >

751 citations

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TL;DR: A phase variable model of the BDCM is developed and used to examine the performance of a BDCm speed servo drive system when fed by hysteresis and pulsewidth-modulated (PWM) current controllers, indicating that the small- and large-signal responses are very similar.

Abstract: For ptI see ibid, vol25, no2, p265-73 (1989) The authors develop a phase variable model of the BDCM (brushless DC motor) and use it to examine the performance of a BDCM speed servo drive system when fed by hysteresis and pulsewidth-modulated (PWM) current controllers Particular attention was paid to the motor large-signal and small-signal dynamics and motor torque pulsations The simulation included the state-space model of the motor and speed controller and real-time model of the inverter switches Every instance of a power device turning on or off was simulated to calculate the current oscillations and resulting torque pulsations The results indicate that the small- and large-signal responses are very similar This result is only true when the timing of the input phase currents with the back EMF (electromotive force) is correct The large-signal and small-signal speed response is the same whether PWM or hysteresis current controllers are used This is because, even though the torque pulsations may be different due to the use of different current controllers, the average value which determines the overall speed response is the same >

644 citations