Implementation of a starting methods of single phase induction motor.
New method to control a single phase induction motor by using a 32 bit high performance digital signal processor. The implemented system consists of a motor, an electronic switch, a running capacitor, and a 32 bit DSP. No starting capacitor or centrifugal switch is used. Control methods based on a DSP are proposed. An improved performance can be obtained when these methods are compared with the capacitor-starting capacitor-running method. The theoretical analysis, hardware design, software design, and experimental results are presented.
To ensure the starting performance of the single-phase induction motor with three parallel-connected windings,this dynamic characteristics and starting methods were studied.At first,the dynamic mathematical model of the proposed motor was established according to the electromagnetic relationship and the simulation analysis was carried out.Secondly,in order to verify the correctness and effectiveness of the dynamic mathematical model,the experimental results were compared with simulation results.Thirdly,based on the simulation model,the influence of capacitors on the starting performance was analyzed in detail,and a simple circuit with only one starting capacitor was put forward.The experiment and simulation results show that selecting the appropriate starting capacitors and operating capacitors can make the proposed motor have excellent starting performance and approximately symmetric three-phase currents under steady-state operation.In actual application,the circuit with starting and operating capacitors can ensure good starting performance.
Method of starting and control for an engine in indu monof c1sico, start system and control for an engine in indu monof and eletr device starting and control applied to a motor in the indu monof .The present invention relates to a method, a system and an electronic device , specially designed for the game and control the operation of a single-phase induction motor .The said motor comprises a winding gear and a starting winding , the starting winding is linked electrically to an electronic device of departure , the winding gear and the electronic device of departure are associated with electrically A source of alternating voltage configured to provide power to the engine .The starting winding is kept de energized in a first instant of operation (topi) of the engine .
The starting performance research on the novel single-phase induction motor .To ensure the starting performance of the single-phase induction motor with three parallel-connected windings, the transient performances and starting methods are studied in this paper. At first, the transient mathematical model of the motor is established according to the electromagnetic relations, and the simulation analysis is performed. Then two starting methods are proposed and studied. The first is starting with two additional starting capacitors. The second is the improvement of the first and has only one additional starting capacitor. By the simulation analysis, it is proved that both of them have good starting performances, and the starting method with one starting capacitor can simplify the starting circuit.
The effect of magnetic saturation was to be included in the performance analysis of an earlier refurbished starting methods of single phase induction motor. The approach was to determine the machine saturation factor by means of a numerical manual computation and to have this factor duly applied on the machine reactances by means of which the saturated version of its reactances were obtained. The latter reactances were then used to realize the required performance parameters of the motor with the non-linear influence of saturation thus included. In this paper, the author details the numerical computations that yielded the saturation factor as Ksat =1.18. The saturated machine reactances were then computed giving the value 2.29 each for the stator winding reactance and the rotor winding reactance (referred to the stator), and the value 92.79 for the magnetizing reactance. Thus, not less than a 15.24% general decrease in the motor reactances was observed.
The invention relates to a single-phase induction motor comprising a main winding, an auxiliary winding which is arranged so that an electrical angle of the auxiliary winding is different from that of the main winding, a plurality of driving capacitors which are connected to the auxiliary winding, a relay for controlling on/off of the driving capacitor in response to the driving load, and a rotor having apertures on the gap side of the slots. The invention further relates to a rotor assembling apparatus comprising a bush to which a rotor core assembly is inserted for die-casting, wherein a clearance between said bush and said rotor core assembly is narrower to the extent that said rotor core assembly can be taken out after die casting; and a core band having a clearance between the core band and the bush in the circumferential direction of said bush, said core band is engaged into said bush so that movement in the axis direction is restricted.
Focuses on the method of starting a three-phase induction motor under single-phasing conditions. Implementation of a starting methods of single phase induction motor.Details of the neutral wire connection for starting the induction motor; Phase difference between winding voltages and starting torque; Utilization of autotransformers.
Induction motor is the most widely used to obtain the driving force in the industrial site. Induction motor generates a high current at startup. Most of starting currents are often more than five times of rated current. This high starting current can cause problems such as the voltage drop in the system. In order to solve these problems, if the motor capacity is large, generally we use reactor starting method rather than direct on line starting method. When a high startup current passes through reactor, reactor can serve as a nonlinear elements. In this study, we analyzed that the current, torque and power of the induction motor are different from the change of linear and nonlinear components of the reactor magnetic field.
The Capacitor start run single phase induction motors are widely used for heavy-duty applications requiring high starting torque. In modern control theory, the induction motor is described by different mathematical models, according to the employed control method. The most commonly used controller for the speed and torque control of induction motor is Proportional plus Integral (PI) controller. However, the PI controller has some disadvantages Such as: the high starting overshoot, sensitivity to controller gains and sluggish response due to sudden disturbance. A new intelligent controller based on Fuzzy logic control is proposed to overcome the above said disadvantages. The performance of the intelligent controller has been investigated through MATlab/Simulink environment, for different operating conditions. Finally, the results are compared with PI controller and intelligent Fuzzy controller.
Versatile electronic method for efficient start, speed-control, direction-reversal, and plugging braking of single-phase induction motors. This is achieved by feeding the two-stator windings of a split-single-phase induction motor via two forced-commutated solid-state converters. AC chopping technique with possible edges control is applied. Thereby, high starting torques and low starting currents are realized. Reversing the direction of rotation and plugging braking are achieved by interchanging the sequence of voltages applied on the stator windings. Also, speed control is achieved at high motor efficiency as ac chopping results in less harmonic contents. The paper computes dynamic and steady-state performance characteristics of the motor using the suggested method. Then it compares them with other methods. For this purpose a state space mathematical model considering the discontinuities introduced by the electronic switches is developed to describe the system.
The aim of this paper is to review the origin and developments of Direct Torque Control (DTC), an advanced control technique of induction motor drives yielding superior performance. The direct torque control is one of the excellent control strategies available for torque control of induction machine. It is considered as an alternative to Field Oriented Control (FOC) technique. The DTC is characterized by the absence of PI regulators, co- ordinate transformations, current regulators and pulse width modulated signal generators. DTC also allows a good torque control in steady state and transient operating conditions. The purpose of this study is to control the speed of 3-Phase Induction Motor with fuzzy logic controller. The fuzzy logic controller will be designed and must be tuned. This is about introducing the new ability of in estimating speed and controlling the 3- phase Induction Motor. In this paper, a study of fuzzy logic controller is used to control the speed of 3-Phase Induction Motor. Direct Torque Control (DTC) is one of the latest techniques to control the speed of motor.
An approach for directly coupling transient magnetic fields and electric circuits is presented. The circuit can contain arbitrary connected solid conductors located in the magnetic field region. Formulations associated with both nodal method and loop method for coupling fields and circuits are deduced and compared. It is found that the structures of the system equations of the two methods are analogous. The proposed formulations allow the equations in stranded windings and solid conductors to be unified and the coefficient matrix of the system equations to be symmetrical. In order to reduce the solution domain the periodic boundary conditions are still applicable when the solid conductors are involved. The developed modeling technique has been applied to the simulation of electric machines. The first example is to calculate the Input phase current and output torque when a single-phase induction motor with shaded rings is In locked-rotor operation. The second example is to simulate the sudden short-circuit of a synchronous generator with starting cage.
A single-phase induction motor with one winding develops starting torque if the stator iron is not symmetrical about the winding axis. Four methods of producing the dissymmetry are described. The most significant design variables are rotor resistance, the location of the dissymmetry, and the difference of the magnetizing reactances perpendicular to and along the dissymmetry. Test and calculated data are shown. The motor can be used where low starting torque is required and, under certain conditions, it is superior to other motors.
A starting device and starting method for a single-phase induction motor, comprising: a stator having a running coil and a starting coil ; a running switch and a starting switch which is conducted to an open condition upon completion of the motor start. The starting device comprises: a starting circuit including a control unit which receives, from a current sensor , signals representative of the current level being supplied to the stator , said control unit being connected to the running and the starting switches , for instructing the open and closed conditions thereof, the open condition of the starting switch being defined when the ratio between the present current level supplied to the stator and the starting current level , upon the closing of the starting and the running switches , reaches a predetermined value.
An adjustable speed single phase induction motors are widely used in domestic applications and industries. It is difficult to get such a single phase induction motor practically. The present work deals with the analysis and design of a speed control for a single phase induction motor. There are several methods which may be used to control the speed such a motor: voltage control, frequency control and a voltage to frequency control, which is widely used in this application.Implementation of a starting methods of single phase induction motor. Most of the previous methods are suffering from certain problems, e.g narrow speed range, starting problems, the low efficiency of the motor. Here a novel method is suggested to use for controller design. the suggested method computed the best values for the frequency and the voltage for any desired reference speed. The simulated open-loop system as well as the closed-loop one are analyzed and the result show that the actual speed is tracking the desired speed and the deference between the reference speed and actual is acceptable.
To overcome the disadvantage of bigger torque ripples existed in direct torque control system of single-phase induction motors, this paper proposed a control method based input-output feedback linearization. Starting from the dynamic mathematical model of single-phase induction motors, the implement methods of input-output feedback linearization were elaborated by introducing new virtual input variables, and then the control system diagram of direct torque control for single-phase induction motors was provided. Finally, modeling and simulation were performed by MATLAB/Simulink. The simulation results show that the proposed control method has a better flux astringency and lower torque ripples.
As single-phase induction motor (SPIM) is not a self-starting motor, it has been a common practice to add an auxiliary component to the motor circuit to establish a starting torque. Traditionally, two capacitors are used in SPIM to establish and improve its starting torque and to enhance its running performance. As the Thyristor-Controlled Series Compensator (TCSC) is a control device that considerably alters impedance of the circuit in which it is inserted to be capacitive or inductive, it can be utilized for starting and running purposes in SPIM. This paper explores the representation of the TCSC as a variable impedance and investigates its valuable impacts, when it is operated in its capacitive mode, on the transient behavior of SPIM. It presents a state-space model of the TCSC-inserted SPIM and shows that inserting the TCSC in the auxiliary winding of the SPIM introduces more benefits compared to the traditionally used methods of starting and running the SPIM.
Without three phase supply, three phase induction motor may operate from single phase supply.In this paper, a new connection method was proposed on the basis of SEMIHEX connection, and method of synthesizing current was used to perform the analysis. Tests were carried out on the two kinds of method. It is proved that the new method has high starting torque, high power factor, and high efficiency.
The principle of direct torque control when applied to single-phase induction motor drive. The presented direct torque control is based on hysteresis band strategy. The proposed control scheme utilizes voltage source inverter consists of a single-phase rectifier cascaded with a four-switch inverter that provides nine voltage vectors and divided the dq plane into eight sectors. A modified switching pattern will be discussed to improve the performance of the drive. Simulation results are provided to illustrate the system operation. A comparison between the presented scheme and another direct torque control drive scheme will be held.
Direct torque control when applied to single-phase induction motor drive. The presented direct torque control is based on hysteresis band strategy. The proposed control scheme utilizes voltage source inverter consisting of a single-phase rectifier cascaded with a four-switch inverter that provides nine voltage vectors and divided the dq plane into eight sectors. A modified switching pattern has been discussed to improve the performance of the drive. Simulation results have been provided to illustrate the system operation. A comparison between the presented scheme and another direct torque control drive scheme has been held.
The rewinding of a burnt-out induction motor stator is a painstaking exercise involving mainly the fait~ful copying of the existing winding. To achieve this, the data of the original winding must be carefully taken. This in'cludes: different types of coils that may be present; the disposition of the coils; the number of turns in each coil, and the conductor size used in each coil type. Faithful recording of the above requires* skill and dedication on the part of the person engaged in the re~inding. The skills are acquired by proper knowledge gained from experienced personnel by using the appropriate equpments such as micrometer screw ~auge and techniques. This situation is not usually readily available in Nigeria as the amateur rewinder usually picks up the technique half baked and with the use of make-shift methods from low level apprenticeship. It should be noted that any error in any of the four items of information above will result in wrong rewinding with consequent malfunction of the motor subseqently.
This chapter presents the working principle and modeling of the single-phase induction motor (SPIM), as well as the control strategies of the SPIM with several different power electronics device-based variable frequency AC drives. The SPIM has been widely used for the water pumps, compressors, and fans with no tough demand for high performance and they are especially used at small-rated power below 1kW. Besides the conventional single-phase main power supply, the SPIM can also be supplied by a single-phase or three-phase voltage source inverter. This chapter will first introduce the working principle of the SPIM, and then establish the modeling of the motor. Thereafter, this chapter will present theoretical analysis on how the SPIM performance is influenced by different supply methods, i.e., including the supply methods using a single-phase inverter with a running capacitor, or using a three-phase inverter with/without a running capacitor.
Operation of a three-phase induction machine on single-phase supply has been an approach used for electromechanical energy conversion in rural communities with limited or no access to three-phase grid. Such single-phase to three-phase conversion can be achieved by passive and active means. In passive methods, fixed capacitors are used for starting and running the motor. Single-phase to three-phase conversion with reduced switch count is desirable, as this leads to a lower cost. However, it is a challenge to start an induction motor using such a power converter and to maintain balanced three-phase voltage under all loading conditions. In this work, unbalance in the motor terminal voltage with variable capacitor emulation method is analyzed quantitatively. This is used to show that perfect balance can not be achieved under all loading conditions. An active phase-converter configuration and its control is proposed that ensures balanced three-phase power supply at the motor terminals under all operating conditions.
A motor controller for a single phase induction motor , wherein the SPIM is driven by a square wave above or below rated frequencies. The square wave may be shaped by introducing one or more notches to eliminate or suppress undesirable harmonics, to reduce the amplitude of the fundamental, to provide desirable voltage control, or to provide desirable voltage to frequency control. The control topology may include switches, main winding taps and switchable capacitors to accommodate selection between line and square wave driving, temporary capacitance increases, or other advantages.
Despite of broad availability and numerous attractive features, single-phase induction motors are still not in use in the vehicular applications because of their difficult starting, complexity of the low-speed operation, and some other control drawbacks. This work focuses on the design of the variable-speed capacitor-run SPIM drive. The motor behavior upon the broad speed range regulation was explored and some methods were proposed to improve the drive speed-torque and speed-current characteristics. To overcome the prominent shortcomings and to meet the vehicle requirements, some novelties were proposed in the SPIM drive control arrangements.
The present invention refers to methods for controlling a double suction compressor for application in refrigeration systems, capable of meeting the different demands for cost, efficiency and control of temperatures by means of techniques of complexity levels and different configurations of the elements from the control loop (temperature sensors, actuators, controllers. Implementation of a starting methods of single phase induction motor.The proposed solutions include the description of a method for controlling and adjusting the refrigeration capacities of a refrigeration system equipped with a double suction compressor, the refrigeration system comprising compartments to be refrigerated and comprising at least two evaporators positioned in the compartments to be refrigerated , the double suction compressor being controllable to alternate its compression capacity, the method comprising steps of Continuously measuring at least a temperature coming from a temperature sensor associated with at least one of the evaporators and acting in the compressor's compression capacity, from the measurement of step .
A system and method for controlling a variable capacity compressor driven by a motor. Preferably, said system and method are used with a reversible, two-stage compressor motor. In one embodiment, the method includes, for example, operating the variable capacity compressor at a first capacity to satisfy a demand for heating or cooling; detecting a change in the demand for heating or cooling; operating the variable capacity compressor at a second, different capacity based on the detected change in demand; detecting an operating parameter that can indicate an opportunity to increase compressor efficiency when the compressor is operating at a given capacity; and varying the torque applied by the motor when the detected operating parameter indicates an opportunity to increase efficiency of the compressor by varying the torque.
A power delivery system, and a method for operating it includes a plurality of power cells that are electrically connected to a multi-winding machine comprising one or more primary windings and a plurality of secondary windings such that each cell is electrically connected to one of the secondary windings and a plurality of the secondary windings are phase-shifted with respect to the primary windings. The method includes determining, for each cell in a set of the power cells, a carrier offset angle, and synchronizing, by the each cell in the set, a carrier signal to the secondary voltage for the cell based on the carrier offset angle determined for the cell. The carrier signal for each cell controls the timing of operation of switching devices within the cell.
The present invention is directed to provide an induction motor having an ideal efficiency at the normal operation time, while obtaining a high locked-rotor torque without having to use a special drive circuit. According to the induction motor related to the present invention, the induction motor has a rotor 11 having a double squirrel-cage secondary conductor, wherein the rotors 11 includes a rotor core 11a formed by laminating a plurality of electromagnetic steel plates, outer layer slots 40a filled with conductive material, installed along an outer peripheral edge of the rotor core 11a, inner layer slots 40b filled with conductive material, disposed inside of the outer layer slot 40a in the radial direction, and inner peripheral thin bridges 82 made of electromagnetic steel plate, installed in between the outer layer slots 40a and the inner layer slots 40b.
