Two-motor System Research Articles

Automatic Switching of Three Phase Induction Motor during Fault Condition

Abstract: Three-Phase Induction Motor Automated Transition in Defective Conditions Maintaining the effective operation of three-phase induction motors is crucial in a variety of industrial contexts. However, malfunctions such as phase inconsistency, voltage drop, and overcurrent can seriously impair motor performance, leading to loss of operation and possible damage. This article introduces an automatic switching method designed to improve the fault-tolerance capacity of induction motors in order to address these issues. The system uses advanced fault detection algorithms to identify abnormal conditions quickly and enable a seamless transition to backup power or other configurations. It also incorporates preventive measures to guard against phase abnormalities and voltage variations that could harm the motor. Through simulation and real-world testing, the suggested system's dependability and effectiveness are confirmed, highlighting its potential to guarantee continuous motor running in industrial applications, a three-phase induction motor must be automatically switched on. A two-motor system a primary motor and a backup motor is shown in this study. If the primary motor fails, the backup motor is automatically turned on. Microcontroller design controls the entire switching process.

Direct torque control of induction motors fed by a single frequency converter

Direct torque control of an induction motor is established by survey of operation regimes of traction electric drives to thoroughly satisfy the requirements for a traction electric drive. The advantages and shortcomings of three-level voltage source inverters in locomotive traction electric drives are highlighted in relation to two-level ones. A mathematical model of a multimotor system fed by a single frequency converter based on direct torque control is developed. It is shown that the variables of an induction motor can be represented as the sum of its average value and deviation from it. The equations for stator flux linkage and torque of an induction motor have been developed for a two-motor system fed by a single voltage source inverter. The topology and principles of operation of direct torque control of induction motors with a three-level voltage source inverter are described. The simplified structure and mathematical model of the mechanical part of a traction drive using basic and axle suspension are considered. The results of simulation carried out by Matlab are shown.

New Neural Network Inverse Control of Two-Motor Drive System

Two-motor drive system is a multi-variable, nonlinear and strongly coupled system. A new synchronous control strategy for two-motor system is proposed based on radial basis function (RBF) neural network inverse with particle swarm optimization. To enhance the system performance, the particle swarm optimization is adopted to optimize the RBF nerve center, an optimized RBF neural network inverse and a two-motor system is connected in series to form composite pseudo-linear system. This two-motor synchronous system can be decoupled into two independent linear subsystems for speed and tension. Then, the decoupled control is implemented by designing a linear closed-loop adjustor. The experimental results verify that the two-motor synchronous system can be decoupled well for speed and tension based on the proposed neural network inverse system. Also, the proposed system can deal with external disturbances with strong robustness.

Least Squares Support Vector Machines Combined Inverse Control of Two-motor Variable Frequency Speed-regulating System

A Least Squares Support Vector Machines (LSSVM) combined inverse control strategy is proposed for two-motor variable frequency speed-regulating system. First, a right inverse control method is adopted to decouple speed and tension of the two-motor system. Then, a left inverse soft-sensing model is applied to estimate the motor rotor flux, which is substituted into the right inverse system in order to form a whole combined inverse controller. To overcome the difficulties in implementing the combined inverse controller by an analytical method, a LSSVM is used to approximate the static nonlinear mapping. Designed two additional controllers, the LSSVM combined inverse control strategy is achieved. Finally, the effectiveness and capability of this proposed control strategy is verified by computer simulations.

Efficiency Enhancement of a New Two-Motor Hybrid System

A new two-motor hybrid system is developed to maximize powertrain efficiency. Efficiency of the system is drastically enhanced without any driving performance sacrifices by switching driving modes from "Hybrid Drive" to "EV (Electric vehicle) Drive" or "Engine Drive" according to the driving condition, along with the application of a series hybrid based system to make full use of high flexibility of engine operating points. Basic concepts of the maximization of powertrain efficiency including an applied system configuration and control technologies are discussed in this paper. Along with this system, a high capacity Li-ion battery and an on-board charger are installed in 2014 Honda Accord Plug-In to add practical plug-in HEV capabilities. Superior fuel economy is achieved with values of 46 MPG (Miles Per Gallon) in CS (Charge Sustaining) mode, 115 MPGe (Miles Per Gallon equivalent) in CD (Charge Depleting) mode and 13miles of AER (All Electric Range). MPGe is a unit of fuel economy for the alternate fuel vehicles such as plug-in hybrid electric vehicles or electric vehicles. The ratings are calculated by converting used electric energy into equivalent amount of gasoline.

Research of Backstepping Control for Multiphase Permanent Magnet Synchronous Motor of Two-Motor Series System

The double Y shift 3 0 PMSM two-motor series-connected system is a novel multi-machines system, which PMSM1 operates on d q plane and PMSM2 operates on 1 2 z z plane. To overcome the poor robustness and static and dynamic performances of PI controller, the backstepping control approach suitable for the two-motor series-connected system is researched. And the backstepping controller of PMSM1 is deduced on d q plane. The simulation contrasting with PI controller show that backstepping can realize the decouple control of the two series-connected motors and improve the dynamic and static performances.

Vector Control for Connectionless Two-Motor Synchronous System

According to two three-phase asynchronous motors system running by connectionless-mode, and considering the system to be required to run in strict synchronous way under different load, the method of field-oriented vector control is used. Thus, the control loops of rotor flux, torque and rotor speed are constructed to make two-motor system run synchronously by torque distribution. The simulation results illustrate its effectiveness and good dynamic and static performance.

Two Kinesins Transport Cargo Primarily via the Action of One Motor: Implications for Intracellular Transport

The number of microtubule motors attached to vesicles, organelles, and other subcellular commodities is widely believed to influence their motile properties. There is also evidence that cells regulate intracellular transport by tuning the number and/or ratio of motor types on cargos. Yet, the number of motors responsible for cargo motion is not easily characterized, and the extent to which motor copy number affects intracellular transport remains controversial. Here, we examined the load-dependent properties of structurally defined motor assemblies composed of two kinesin-1 molecules. We found that a group of kinesins can produce forces and move with velocities beyond the abilities of single kinesin molecules. However, such capabilities are not typically harnessed by the system. Instead, two-kinesin assemblies adopt a range of microtubule-bound configurations while transporting cargos against an applied load. The binding arrangement of motors on their filament dictates how loads are distributed within the two-motor system, which in turn influences motor-microtubule affinities. Most configurations promote microtubule detachment and prevent both kinesins from contributing to force production. These results imply that cargos will tend to be carried by only a fraction of the total number of kinesins that are available for transport at any given time, and provide an alternative explanation for observations that intracellular transport depends weakly on kinesin number in vivo.

Decanter형 원심분리기의 동력 계산 (II) - 총동력과 동력전달 기구 -

In this paper, we derived the formula for estimating the power of the electric motors needed to operate the Decanter-type centrifuge. In the derivation of the formula the sludge-removal torque is to be supplied from the formula derived in the first paper. The intricate nature of the transmission mechanism in the planetary gear trains of the sludge-removal power and torque has been clarified in this second paper. In particular we considered two-motor system, where the main motor drives the machine while the differential-speed control motor plays the role of braking in adjusting the differential speed. Sample calculation for the specific design treated in the first paper showed that the selection criterion for the main motor depends on the lower limit of the differential speed; when the lower limit is set low, it should be selected based on the steadily operating power, while it should be selected based on the starting power when the lower limit is set high. The total power required by both the main motor and the differential-speed control motor increases as the differential speed is decreased. It is suggested that the power loss in the differential-speed control motor could be minimized by attaching an electric generator to it.<br/>

Closed-loop control of stepping motor systems

The performance of a multimotor system with single common closed loop control has been investigated with particular reference to a two-motor system. The system was found to be unstable, with the velocities of the motors oscillating with increasing amplitude. The origin of the oscillations is discussed, and methods for their elimination are presented. It is concluded that the simple control strategy used is inadequate for stable operation of a multimotor system.< <ETX xmlns:mml="http://www.w3.org/1998/Math/MathML" xmlns:xlink="http://www.w3.org/1999/xlink">&gt;</ETX>

Instabilities in dual stepping motor systems

The performance of a multi-motor system with a single common closed-loop has been investigated with particular reference to a two-motor system. The system was found to be unstable, with the velocities of the motors oscillating with increasing amplitude. The origin of the oscillations is discussed and methods for their elimination are presented. In conclusion, it is evident that the simple control strategy used is inadequate for stable operation of a multi-motor system.

Applications of closed-loop stepping motor control in multi-motor systems

Stepping motors, as digital machines, are commonly used in electromechanical systems since they can easily be interfaced to and controlled by computers. Electrical and mechanical interaction in multiple-motor systems, however, can lead to severe control problems, and in intelligent systems such as programmable XYtables, rotor position feedback from each machine is necessary to implement effective control algorithms.This paper describes new methods of detecting rotor position in stepping motors with chopper drives. By monitoring the motor phase current waveforms and detecting the chopping current rise-times, motor phase excitation angle may be varied continuously over a step cycle, and performance may be maximized.Two industrial applications are described: accurate trajectory control in an XY table, where close position coordination between two motors is necessary; and velocity control in a two-motor system where mechanical interaction creates a variable inertia load for one motor.