Linear control starter for single phase induction motor

It is well understood that induction motors draw higher currents during their starting operations than is the case under full load running conditions. Since the early days of induction motor availability, starting methods other than Direct-on-Line have been used, and in some cases mandated by Utilities, to reduce the effect of these high starting currents on the electrical distribution network. What is generally not recognized is the existence of short duration inrush currents, which greatly exceed these starting currents. Furthermore, the introduction of complex starting methods to reduce starting currents is often compromised by other unanticipated inrush currents introduced by the starting system itself, unless special precautions are taken. This paper implements a device that protects three phase induction motor from inrush currents on the distribution system, as well as on the motor protection components using PIC16F84A Microcontroller.

IEEE Access, 2021

The recent increase in electricity prices and the usage of single-phase induction motors (SPIMs) provide a stimulus for a focused research on energy-efficient optimization of SPIM load such as air-conditioners and refrigerators. Variable speed control of SPIM provides a promising way forward to reduce its power consumption. However, during variable speed operation under the popular constant V /f method, SPIM is required to operate at non-rated conditions. The operation of SPIM at non-rated conditions disturbs its symmetrical and balanced operation, thus degrading its efficiency. Moreover, soft-starting of SPIM at non-rated conditions is also challenging due to the resulting reduction in starting-torque. In this article, after a detailed analysis of SPIM energy-efficiency, an improved sensor-less optimal speed control strategy is developed to enable the symmetrical and balanced operation of SPIM at all the operating points over the entire speed-range to improve its performance. A novel algorithm, termed as the phase-shift algorithm, is also devised for efficient implementation of the proposed optimal speed control strategy. In addition, a unique framework for efficient soft-starting of SPIM at very low frequencies is also developed. The simulation-based results of the motor operated through the proposed phase-shift algorithm validate the energy-saving potential of the proposed control strategy. INDEX TERMS Energy-efficient control, variable speed drives, speed-sensorless induction motor control, magnetic-field control, inrush current reduction, starting torque, pulsating torque, energy savings in HVAC.

Journal of Newviews in Engineering and Technology (JNET), 2020

This paper is aimed at designing and constructing a portable multi-mode induction motor starter which includes a Direct on Line (DOL), Variable Frequency Drive (VFD), and stardelta starting modes. Several starting and control modes are available. The design is done such that a three-phase induction motor could be started with each of the starting modes independently, depending on the requirement of the user of such induction motor. The selection of each of the starting modes is done with the aid of a button which is automated by an Arduino programmed board. An overload relay is used for system protection to detect an over current in the system. System protection is facilitated by the contactors and the Arduino board output relays and these two components get instruction from the Arduino board. A portable multi-mode induction motor starter has been successfully designed and implemented in the module that is presented. On testing of the module with a 1hp induction motor, it was observed that the DOL mode starting current peaked at 1.61A while that of the VFD peaked at 0.31A. The designed and implemented module provides a simple means of choosing an adequate operational mode to operate an induction motor under full and no-load conditions; view operational conditions (i.e. operational current of the induction motor), as well as, serves as a protective circuitry for the induction motor powered system during operation. .

Electronics

The development trends of the modern world of power electronics dictate the requirements for the use of AC voltage converters as soft starters for induction motors. A direct connection of the motors to the mains voltage negatively affects both the motor itself and the mains system as a whole due to high starting currents values, which entail, as a rule, more frequent accidents and shorten the drive system service life. Modern methods of motor acceleration are implemented in practice by means of frequency converters, which require the presence of both a rectifier and an inverter in the structure of the device. The paper presents a study of the control system of a multi-zone AC voltage single-stage regulator. The use of capacitive voltage dividers will also compensate for the consumed reactive power. The article analyzes the features of modern soft starters, describes the circuit design, presents a mathematical calculation by the differential equations algebraization method, a perform...

IARJSET, 2017

One of the most common electrical motor used in most applications is induction motor; hence analysis of induction motor is much essential to find out utilization index of a motor for better performance. Hence protecting induction motor from some faults is necessary. The use of microcontroller technology has enabled the design of energy-efficient and cost-effective control systems for induction motors [3]. This paper presents PIC microcontroller based control system for protection of a single phase induction motor. Due to electrical fault the winding of motor get heated which leads to insulation failure and thus reduce the life time of motor. This protection scheme protects the single phase induction motor from under voltage, over voltage, over current and over heat [4]. It also measures speed of the motor. PIC microcontroller monitors the overall process.

Single-phase induction motors are widely used in home appliances and Industrial control because of their low cost and rugged construction. Many industrial processes require variable speed drives for various applications. This paper investigates the speed control performance of single-phase induction motor using microcontroller 18F2520. SPWM technique has been employed in this H-BRIDGE inverter to supply the motor with ac voltage. The mct2e optocoupler serves the purpose of isolation between the microcontroller circuit and the H-BRIDGE inverter and supplies the required gate voltage for the conduction of the power MOSFET (IRF840) in the H-BRIDGE inverter The microcontroller senses the speed's feedback signal and consequently provides the pulse width variation signal that sets the voltage and frequency ratio constant, which in turn provides the constant torque for the desired speed. The complete design is modelled and tested using MATLAB simulation and hardware implementation to control the speed of a capacitance start-run single phase induction motor by Sinusoidal pulse width modulation methods using volts/hertz algorithm is carried out.

International Journal of Engineering Research and Technology (IJERT), 2014

https://www.ijert.org/simulation-of-2-phase-soft-starter-control-for-induction-motor-with-minimized-starting-torque-pulsation https://www.ijert.org/research/simulation-of-2-phase-soft-starter-control-for-induction-motor-with-minimized-starting-torque-pulsation-IJERTV3IS051072.pdf AC voltage controllers are used as soft starters for smooth starting of induction motors. Soft starters are used for induction motor drives having fan, pump and blowers types load where load torque is directly proportional to square of speed. This paper presents a novel control technique for ac voltage controller using 2-phase in place of 3-phase. Control circuit generates the firing pulses for appropriate thyristors for any given operating torque and speed of the motor. Out put voltage can be controlled by controlling firing angle. Simulation results presented in this paper elucidates the advantages of proposed soft starting method over conventional method. Finally features and benefits of the proposed technique are concluded.

Thyristors are now widely used in many power electronics and motors drives applications. This is due to their several advantages such as relatively small size, low losses, market availability, and low cost. In this paper, a stator voltage control of single-phase induction motor using thyristors is analyzed and simulated. The stator voltage has been controlled by phase angle control of single-phase supply. The delay angles and their corresponding resistor values before the thyristor fires had been analysed. Firing requirements and limits of control have also been studied. An electronic circuit is designed on multisim software with BT 151 thyristor to control the speed of AC induction motor and simulated. The simulation results have been found in correlation with the one obtained from the simulated matlab program using MATLAB 7.

Arturo C. Ruiz Rodríguez y la arqueología ibera en Jaén. Homenaje a 50 años de trayectoria

Un homenaje a cincuenta años de trayectoria. caPÍTUloS 1 Manuel Molinos Molinos. Viajes con Arturo Ruiz: del espacio y el tiempo al territorio astral.

Mitteilungen der Berliner Gesellschaft für Anthropologie, Ethnologie und Urgeschichte Bd. 24, 2003