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Tightening legislation on machine safety, such as the new European Machine Directive that became applicable in Dec 2009, requires that the machine manufacturer has to perform a risk assessment to determine safety requirements. These requirements will result in partial redesign of the control system. In order to reduce this redesign, a risk assessment process utilizing several methodologies for early...
This paper presents an approach to radio frequency (RF) power control along a power curve specified as a function of load impedance, which varies with time. The control algorithm was developed to control the output of electrosurgical generator s but can be used in any other application, where for time-varying loads, some specific power, voltage and current limits have to be met. Such generators may...
The control scheme of parallel drive system of the dual Switched Reluctance machines based on fuzzy logic control is proposed and verified for the first time. The system consists of main machine, subordinate machine, main power converter, subordinate power converters, main controller and subordinate controller. The main controller is used for closed-loop rotor speed control of main machine, with the...
The characteristics of high-frequency and high-speed for high-speed permanent magnet synchronous motor have led to great difficulties for control. The starting and setting is complicated and losing synchronous easily. The current harmonics for the high-speed motor power supply is larger. The high-speed permanent magnet synchronous motor (PMSM) fuzzy-PID controller is proposed in this paper combined...
This paper presents the study and analysis of the fuzzy and PI control system applying to Permanent-Magnet Brushless DC (BLDC) motor. The most commonly used controller for dc motor controller system is Proportional-Integral (PI) controller. However, the PI controller has some disadvantages such as: high starting overshoot, sensitivity to controller gains and sluggish response due to sudden load disturbance...
In this paper, a nominal characteristic trajectory following (NCTF) controller for point-to-point (PTP) positioning system for two mass rotary system is introduced and its performance is evaluated. Generally, the NCTF controller consists of a nominal characteristic trajectory (NCT) and a compensator. The objective of the NCTF controller is to make the object motion follow the NCT and end at its origin...
In view of the controlled plant complexity of the horizontal position synchronization system in automatic filling machine, a novel approach of single neuron PID model reference adaptive control for AC permanent magnet synchronous motor (PMSM) servo control based on diagonal recurrent neural network (DRNN) on-line identification is proposed owing to the disadvantage of traditional PID controller. The...
The structure and principle of projected fringe phase minor translating equipment is introduced. Minor step system of 3D measuring instrument based on 4-step phase-translating method of projected fringe phase measurement profilometry is designed. Main functions and step angle subdivision theory of stepping motor driving chip 3955 are explained. 3955 chip is set and controlled by SCM AT89C52 through...
Generally, because of the temperature rise, the ageing, the saturation, etc. the resistance value and inductance value of the machine windings and the magnetic flux will be changed. The control performance of the permanent magnetic synchronous motors (PMSM) can be influenced by the plant parameter variation and external disturbance. This paper presents a robust H∞ control for PMSM drivers. Firstly,...
According to the need of mobile robot motion control, the control system of brushless DC motor (BLDCM) based on TMS320LF2407A is proposed in this paper. By analyzing the principle of BLDCM and the function of TMS320LF2407A, it described the design on the software and the hardware for the control system. The experiment result shows that good effect of control system was obtained. It not only simplifies...
Focusing on the shortage of traditional PID control and fuzzy control, this paper has made the model of Permanent Magnet Linear Synchronous Motors (PMLSM). Then, a fuzzy PID controller has been designed to control the speed of PMLSM, and a simulation experiment is conducted in the last. The results of the experiment verify that fuzzy PID control is superior to PID control.
Torque ripple seriously affects the performance of brushless DC machine (BLDCM). Analyzed the principle of current hysteresis controller reducing non-commutation phase current which made BLDCM system become more hysteretic, the precise model of BLDCM is difficult to obtain. The fuzzy-PID control based on current hysteresis controller was proposed to diminish torque ripple and overcome the shortcomings...
The working principle and composition of the pump-control-motor variable speed throttle combined speed governing system are introduced, the system's AMEsim-Simulink co-simulation model is established. According to the characteristics of variable speed and throttle speed governign, the control strategy of the system is put forward. The complex controller which is based on PID with feedforward compensation...
For the multi-motor synchronous control system has time delay and stochastic disturbance and uncertainty model factors, this paper proposed a fuzzy Smith controller which combined Smith pre-estimate control and fuzzy PID control, introducing the structure, the design method of the speed controller and modeling of the control system. Matlab toolboxes are used to simulate the multi-motor synchronous...
When the wind speed is between the cut-in and the rated wind speed, the generator control aims at maximum energy capture. The third-order nonlinear model of the Permanent magnet synchronous generator (PMSG)-based wind power conversion system (WECS) is established. In order to ensure maximum energy capture under rated wind speed, firstly, the nonlinear model is linearized around different operating...
Applying a novel control method of the Port-Controlled Hamiltonian (PCH) systems with dissipation, the modelling and speed tracking control of induction motor is presented when load torque is known and unknown. A PCH model of induction motor is established. The induction motor and controller are interconnected, and desired closed-loop PCH system structure is obtained by the feedback control. The desired...
Based on the rebuilt of control rule base, a modified type PI-like fuzzy logic controller (FLC) with output scaling factor (SF) self-tuning mechanism is proposed in this paper for application in the switched reluctance motor (SRM) drive system. This paper intends to simplify the construction hierarchy and computational complexity of the controller by trimming the number of fuzzy sets in the membership...
Main target of this research is developing of a simple hybrid power control method for existing trains. This paper describes the design, construction and testing of the drive control method for the autonomous-decentralized hybrid test train equipped with proton-exchange-membrane-type fuel cells (PEMFC) system and lithium-ion battery system (Li-Batt). The main object of this research is to estimate...
This paper introduces two torque ripple suppression control methods for permanent magnet synchronous motor. With a system identification technique, the system model from compensating current input to torque detection output can be expressed as the speed-adjustable 1-dimension complex vector in the coordinate system synchronizing with the torque ripple frequency. The first method introduces a periodic...
This paper presents a hysteresis based current control PWM named “Hi-PWM”, which has several advantages such as quick response of current, less fluctuation of switching frequency and less harmonic components. In this paper, the improvement of Hi-PWM is explained, which realizes switching frequency control and output voltage calculation. This paper also shows simulation results driving induction motor...
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