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Because of the asynchronousy of the control system caused by internal tension imbalance in the running of tri-motors driving conveyance line, this paper mainly discuss a practical program - synchronous automatic speed control system. In this system, the rotary encoder is adopted to detect the motors' speed, samples and analyses various motor speeds through the PLC and adjusts the motors' speed by...
This paper deals with an electronic load controller (ELC) for a standalone induction generator (IG) used in small hydro power generation. The proposed ELC is used to control the voltage and frequency of IG. This ELC is realized using a non-isolated T-connected transformer and three-leg insulated gate bipolar transistors (IGBTs) based current controlled voltage source converter (VSC), a capacitor,...
This paper describes a fuzzy control system and simulation for ultrasonic motors. Although ultrasonic motor has much merit, such as small size, light weight, high precision, fast control dynamics and large driving force when low speed, etc. However, the nonlinear dynamic characteristic and the accurate mathematical model is difficult to obtain. So the traditional control method is almost no effect...
This paper introduces the main control methods of AC motor. Using traditional slip frequency control method, the PI parameters are hard to be determined, digitization of the current-slip curve is hard to be realized and the maximum torque cannot be obtained. A maximum-torque slip frequency control method is proposed to meet the requirements of mining locomotives. Simulation and experiment shows that...
In this paper, design and implementation of an intelligent disturbance weighting function for H∞-based precision positioning control system is presented for an AC motor drive X-Y table positioning mechanism. The system works with a robust feedback controlled, enhanced by an outer loop integral control. The objective is to achieve high tracking and contouring performances even in the presence of uncertainties...
The paper does not only provide the fundamental introduction of the working mechanism of the digital fiber drawing machine, but also achieves the automation control on the machine. Furthermore, this paper gives detailed discussions on the control system, hardware configuration and software design, and provides the I/O wiring diagram and the program design flow chart. The system design is quite reliable...
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...
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...
A fuzzy-neuro controller has been designed to stabilize the frequency and voltage output of a synchronous generator. The structure of the proposed control system consists of two PI -like fuzzy controllers and two neural networks. With this control scheme, difficulty for tuning scale factors of the fuzzy controller is reduced. Simulation results show that the system is robust to drastic changes on...
Direct Torque Control of induction machines is known to offer fast instantaneous torque and flux control with a simple control structure. However, this scheme has two major disadvantageous namely variable inverter switching frequency and high torque ripple. These problems occur due to the use of hysteresis comparators in the conventional DTC scheme, particularly in controlling the output torque. This...
This paper presents a simple overmodulation method employed in direct torque control (DTC)-constant switching frequency (CSF) controller of induction machines. The proposed overmodulation method is utilized to extend a constant torque region and hence produces high torque capability in field weakening region with six-step operation. It will be shown that the overmodulation operation using the DTC-CSF...
Nowadays, a wind turbine generator (WTG) is required to provide control capabilities regarding an output power. Under this scenario, this paper presents a frequency control method by coordination control of the WTG and a battery using load estimation by a disturbance observer for isolated island. The load variation is reduced by the WTG using pitch angle control in low frequency domain and the battery...
Pulse-width modulated power converters are currently the most widespread solution in industrial drive applications. The common trend in converter development is to operate all system components at, or - for short durations - even above their rated values. At system configurations where the inverter is operating at its thermal limit different points of operation of a connected machine require special...
In accordance with the advantage of conventional hysteretic current control method, this paper advances a novel control method for active power filter (APF). In conventional hysteretic current control, the hysteretic band (HB) is fixed and actual compensating current is limited in a fixed hysteretic band. When the voltage source inverter (VSI) works in high-frequency state, as the switching frequency...
This paper gives an overview about motion control of induction motor and also presents the simulation and experiment of induction motor controller using method of voltage/frequency control. In this paper, the voltage/frequency (V/Hz) control principle is used to the speed controller for 3-phase AC induction motor. The DSP (TMS320F2812) controller is used to read the stator flux of motor (the AC machine...
An effective scheme of induction motor control without using stator sensor is proposed in this paper. The effective scheme consist of speed calculation algorithm and voltage/frequency control. The speed calculation algorithm is achieved by sensoring the current of stator and compared with the prospective speed then calculation by DSP. The principles of constant voltage/frequency (V/Hz) control for...
The peak-current control that is modeled in this paper is a novel variable-frequency control that maintains regulation in a flyback converter by enabling and disabling cycles instead of modulating the pulse width, which allows for elimination of feedback compensation and can provide for peak power three times higher than the rated full-load power without increasing the power supply component sizes...
This study presents an adaptive fuzzy controller for linear X-Y table based on FPGA (Field Programmable Gate Array) technology. The linear X-Y table is driven by two PMLSMs (Permanent Magnet Linear Synchronous Motors). Firstly, a mathematic modeled for PMLSM drive is defined. Secondly, to increase the performance of the PMLSM drive system, an AFC (Adaptive Fuzzy Controller) constructed by a fuzzy...
A new experiment for undergraduates showing voltage and frequency control of a small alternator for a two bus power system is introduced. Voltage and frequency controllers were designed in Simulink and implemented using dSPACE. A subsystem of the scaled down power system testbed developed at Florida International University was utilized to study the effects of varying load on the generator operating...
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