scholarly journals The Rise of VSR Motors

1998 ◽  
Vol 120 (02) ◽  
pp. 86-87
Author(s):  
Greg Paula
Keyword(s):  
Induction Motor ◽  
Torque Ripple ◽  
Stepper Motor ◽  
Variable Speed ◽  
Control Torque ◽  
Switched Reluctance ◽  
Air Gaps ◽  
Tangential Forces ◽  
Coil Winding ◽  
Ac Induction Motor

This article reviews variable-switched reluctance (VSR) motors that are now entering mainstream use from jet fighters to washing machines. A VSR motor is generally used as a stepper motor and, if properly controlled, can be made to behave like a servomotor. Basically, the motor is a rotor and stator with a coil winding in the stator. VSR motors also provide other benefits. They can be programmed to precisely match the loads they serve, and their simple, rugged construction has no expensive magnets or squirrel cages like the ac induction motor. It can be difficult to give VSR motors a smooth torque profile, so they are used more often in place of variable speed motors than as servomotors. There are ways to control torque ripple, such as adding encoders and electronics to compensate, but these added controls could cost at least as much as what the motor itself would save. VSR motors work with relatively small air gaps. If the shaft is off-center, unbalanced tangential forces come into play, so shafts and bearing systems generally need to be of a higher quality than with other motors.

scholarly journals UNJUK KERJA DAN PEMANFAATAN INVERTER SEBAGAI PENGENDALI KECEPATAN MOTOR INDUKSI 3 PHASA

2013 ◽  
Vol 5 (2) ◽  
pp. 87-92
Author(s):  
Anton Anton ◽  
Tuti Angraini
Keyword(s):  
Induction Motor ◽  
Induction Motors ◽  
Low Cost ◽  
Variable Frequency ◽  
Variable Speed ◽  
Motor Speed ◽  
Insulated Gate Bipolar Transistor ◽  
Normal Speed ◽  
Domestic Environments ◽  
Ac Induction Motor

The Induction motors are found in industrial and domestic environments because of low cost of operation including, induction motors are widely used induction motor 1 phase and 3 phase. During operation of induction motors generally used at normal speed, but the specific purpose induction motors operated with variable speed. In order to obtain varying motor speed can be controlled using the inverter. The use of inverters here to give supplay voltage AC induction motor in which the magnitude of the frequency can be varied. Setting frequency of the inverter utilizing method pulse with modulation (PWM). The circuit used to build PWM, using Insulated Gate Bipolar Transistor (IGBT) technology. Values ​​obtained variable frequency ranging from 4 Hz to 50 Hz, and acquired motor speed ranging from 12 rpm up to 1390 rpm.

scholarly journals Pengaruh Arus Harmonisa Pada Unjuk Kerja Sistem Open-Loop Variable Speed Drive Motor Induksi Menggunkanan Inverter

2016 ◽  
Vol 12 (1) ◽  
pp. 9
Author(s):  
Suroso Suroso ◽  
Winasis Winasis ◽  
Daru Tri Nugroho ◽  
Sebastian Adi Prakoso
Keyword(s):  
Induction Motor ◽  
Torque Ripple ◽  
Open Loop ◽  
Variable Speed ◽  
Variable Speed Drive ◽  
Engine Vibration ◽  
Squirrel Cage ◽  
Squirrel Cage Induction Motor ◽  
Drive Motor ◽  
Cage Induction Motor

<p align="justify"><em>One of the  the inverter’s applications is in Variable Speed Drive (VSD) to control the speed of an induction motor by varying  the voltage or the output frequency of the inverter. Induction motor reliability driven by using inverter is often affected by harmonics components of the current and voltage  generated by the inverter. This phenomenon brings harmonic losses in the industry process applying VSD and induction motors, because not all inverters produce a pure sinusoidal wave. Thi paper presents the effect of harmonics on the performance of squirrel cage induction motor type i.e. the speed, torque and efficiency by conducting computer simulation and experimental test in laboratory. The increase in the value of harmonics resulting an increase in the value of speed 1.41%, an increase in the value of torque 1.81 Nm, and decreased of efficiency 1to5%, the harmonics also resulted torque ripple 2 to5 times resulting in unstable speed of motor, arising engine vibration and causing motor heating</em></p>

scholarly journals Gearless Powertrain for Electric Vehicles

2021 ◽  
Author(s):  
Atif Iqbal ◽  
Prathap Reddy ◽  
Mohammad Meraj
Keyword(s):  
Induction Motor ◽  
Power Distribution ◽  
Fault Tolerant ◽  
Torque Ripple ◽  
Power Converter ◽  
Efficient Solutions ◽  
Electrical Machines ◽  
Modern World ◽  
Variable Speed ◽  
Field Oriented Vector Control

Electrical Machines are driving the modern world in one way or the other. The modern world is moving towards the sustainability of ecological systems and greener modes of transportation to stabilize the environmental conditions for future generations. For this, the multiphase machines have risen as efficient solutions over traditional 3-phase electrical machines. In this project, a Pole Phase Modulated (PPM) multiphase induction motor drive is developed for gearless electric vehicle applications. With the help of conventional pole changing techniques (like using multiple auxiliary windings or dual stator windings) variable speed and torques can be achieved but the poor copper utilization, de-energization of the windings, and multiple auxiliary windings are the major limitations. In this project, a novel single stator winding multiphase induction motor is developed that is capable of delivering variable speed-torques by varying the number of phases as well as poles simultaneously using novel multiphase power converter topologies. Moreover, the proposed drive offers high fault-tolerant capability, the ability to handle high power with reduced voltage ratings of power electronic devices, better torque/power distribution, and improved efficiency with a lesser magnitude of space harmonics, etc. The proposed drive gives similar speed torque characteristics of conventional IC-based conventional vehicles, which helps in the elimination of the gearbox system in the EVs. This minimizes the cost, size, weight, and volume of the vehicle. Two-level inverters and multilevel inverters with carrier phase shifted space vector PWM are developed for achieving the better performance of the PPM-based MIM drive w.r.t. efficiency, torque ripple and DC link utilization. Fault-tolerant operation of the drive with respect to inverter switch or source failures is also developed as a part of the project and presented. To operate the PPM-based MIM drive smoothly in different pole phase combinations, the indirect field-oriented vector control is developed and presented.

A Switched-Reluctance Motor Drive with Zero Torque Ripple and a Constant Inverter Bus Current

1994 ◽  
Vol 208 (1) ◽  
pp. 61-68 ◽  
Author(s):  
G Dunlop
Keyword(s):  
Induction Motor ◽  
Position Control ◽  
Switched Reluctance Motor ◽  
Torque Ripple ◽  
Graphical Form ◽  
Switched Reluctance Motors ◽  
Switched Reluctance ◽  
Constant Torque ◽  
Reluctance Motor ◽  
The Individual

Switched-reluctance motors appear to be ideal industrial prime movers capable of precision speed and position control. The efficiency can be higher than for a similar-sized induction motor and the electronics less complicated for precise speed control. While the switched-reluctance drive is common in some applications, it has not been widely accepted because of the large amount of torque ripple produced. The torque ripple from the widely used induction motor is quite low and it causes less vibration in the mechanical drive train following the motor. A four-phase switched-reluctance motor can he operated in such a way as to produce a constant zero-ripple torque output. The currents in at least two of the four phases are set so that the total torque produced is constant. By precisely setting the currents in three of the four phases, a constant torque output can be obtained at a constant d.c. supply current, and the switched-reluctance motor then has similar characteristics to a d.c. series motor. A mathematical description of these non-linear currents is derived along with the individual and mutual torque contributions to the total constant torque. The equations are also shown in graphical form.

The Influence of Supply Voltage Amplitude Variation Law on AC Induction Motor Efficiency in Variable-Speed Drive

2010 ◽  
Vol 164 ◽  
pp. 1-4 ◽  
Author(s):  
V. Bleizgys ◽  
A. Baskys
Keyword(s):  
Induction Motor ◽  
High Efficiency ◽  
Supply Voltage ◽  
Frequency Converter ◽  
Voltage Amplitude ◽  
Variable Speed ◽  
Amplitude Variation ◽  
Variable Speed Drive ◽  
Motor Efficiency ◽  
Ac Induction Motor

This paper presents investigation results of the influence of the supply voltage amplitude variation law on the efficiency of AC induction motor in variable-speed drive based on the frequency converter. It is demonstrated that the commonly employed linear and square voltage amplitude variation laws do not provide the highest efficiency of the AC induction motor. The corrected AC voltage amplitude variation dependences for different motor load torque, at which high efficiency of the motor supplied by the frequency converter is maintained, are proposed and discussed. Reported experimental study was performed on a special test bench.

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