Speed Control of Synchronous Machines
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Abstract:
The general problem of continuous speed control of synchronous machines arising-out of the possibility of supplying these machines through a variable frequency static device is presented Considering the steady state, some control laws for machines with a single rotor winding are derived. These laws impose various operating conditions. Some problems connected with the application of these synchronous actuators in speed control systems are discussed.Keywords:
Synchronous motor
Machine control
Electronic speed control
This paper presents a self-sensing technique for a surface-mounted permanent-magnet synchronous machine (SM-PMSM) based on high frequency voltage injection. The reactances of the high frequency model vary as a function of rotor position and a simple method based on measured currents and voltages can be used to identify those reactances. Using the motor reactances, the rotor position and velocity are determined. The proposed technique is relatively independent of the machine parameters and it can be applied to any type of synchronous machine. The proposed technique has been tested experimentally for a commercial SM-PMSM machine. The experimental results have demonstrated the feasibility of the proposed technique
Synchronous motor
Machine control
Position (finance)
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In this paper, a variable reference speed control of a high-speed Brushless DC(BLDC) motor for blender machines is proposed for reducing the speed ripple at the high-speed pulsating load variation condition. A high-speed 2-pole BLDC motor is designed to satisfy the operating speed and the efficiency of the blender machine. According to the pulsating load, the motor speed is pulsated by the conventional current limit control scheme in the constant power region. In order to improve the grinding performance, the reference speed is automatically varied to overcome the pulsating load variation in the proposed method. From the reference speed control, the output torque of the motor can satisfy the pulsating load of the blender machine. The designed high speed BLDC motor and the proposed control scheme are verified by simulations and experiments.
Electronic speed control
Machine control
Torque ripple
Operating speed
Motor drive
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SFC (static frequency converter) system has been used as drive of large synchronous machine in many industry applications. But many papers have been presented on the control algorithm of SFC system, not the acceleration and start-up but the rated speed operation with line connection and the braking operation with regeneration which is used in the industry. This paper presents all control algorithms for the large synchronous machine connected with SFC system. The experimental results show that the proposed several algorithms are proper and effective
Synchronous motor
Machine control
Line (geometry)
Motor drive
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Citations (6)
The I/f control is an open-loop method of control of PM machines in which the reference current is set proportionally to the electrical frequency while the voltage is generated through a current regulator. A realization of the method for control of a very high-speed synchronous PM motor is presented in the paper. To add necessary damping to the system, the controller uses modulation of the electrical frequency in the way which is frequently utilized in the V/f method for high-speed PM machines. Adequate current reference is obtained based on measurements of the no-load voltage and speed decay. Stable speed control is achieved throughout the whole speed range.
Realization (probability)
Electronic speed control
Machine control
Current loop
Synchronous motor
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Citations (18)
This paper describes the position sensorless algorithms presently used in the motor control for the NASA in-house development work of the flywheel energy storage system. At zero and low speeds a signal injection technique, the self-sensing method, is used to determine rotor position. At higher speeds, an open loop estimate of the back EMF of the machine is made to determine the rotor position. At start up, the rotor is set to a known position by commanding dc into one of the phase windings. Experimental results up to 52,000 rpm are presented.
Flywheel
Position (finance)
Machine control
Position sensor
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This paper is proposed DC motor for speed controlling using PWM control with the PIC microcontroller. The DC machine is explicitly comparing to the voltage associated over its terminals for controlling the speed. Consequently, on the off chance that the voltage over the terminal of motor is moved, a
Electronic speed control
Machine control
Motor controller
Adjustable-speed drive
Motor Control
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Citations (1)
The general problem of continuous speed control of synchronous machines arising-out of the possibility of supplying these machines through a variable frequency static device is presented Considering the steady state, some control laws for machines with a single rotor winding are derived. These laws impose various operating conditions. Some problems connected with the application of these synchronous actuators in speed control systems are discussed.
Synchronous motor
Machine control
Electronic speed control
Cite
Citations (6)
Up to the date, high frequency signal injection sensorless control techniques normally assume a purely inductive behavior of the machine at high frequency, the rotor position-dependent differential inductance being the term tracked and from which the rotor position is estimated. However, certain machine designs show a rotor position-dependent high frequency resistance, which can also be used for sensorless control purposes. The differential rotor resistance occurs due to the differences in the electrical conductivity between rotor materials, and been found to be, depending on the machine design, less sensitive to operating condition than the differential inductance. This paper compares the use of the high frequency inductance and the high frequency rotor resistance for sensorless control of AC machines, particularly surface permanent magnet synchronous machines (SPMSM), using high frequency signal injection. It will be shown that the behavior of these two quantities strongly depends on the machine design, but can also be influenced by its operating condition -mainly the load level-, which needs to be considered for the design of the rotor position estimation strategy.
Machine control
SIGNAL (programming language)
Position (finance)
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Citations (19)
This paper introduces a sensorless control method of position estimation for permanent magnet (PM) synchronous machines. The method, using rotating vector, carrier frequency excitation and heterodyning, tracking observers for position estimation is discussed. The experimental results for the case of a buried PM machine are shown in the paper. It has been demonstrated that this technique can operate over a wide speed range.
Synchronous motor
Position (finance)
Machine control
Tracking (education)
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Citations (16)
Hybrid excited synchronous machines are getting used wider and have perspectives for being used in many spheres where there is a need in efficient machine with magnetic flux control ability, especially, while prices on permanent magnets are getting higher. Models of synchronous machines with hybrid excitation allows to simulate different operation modes itself and create more complex models including this type of machine. For accurate analysis of hybrid excitation synchronous motor and it`s drive control it is significant to have an accurate model. This paper deals with comparison of synchronous machine with hybrid excitation with non-sinusoidal and sinusoidal back-emf.
Synchronous motor
Non-sinusoidal waveform
Machine control
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Citations (1)