Performance study of an engine operated mechinecal chopper

Journal of Agricultural Engineering, 2014

The main purpose of the study was to evaluate the field performance of BRRI power chopper machine (diesel engine and electric motor operated) in order to promote mechanized feed chopper in Bangladesh. The experiment was carried out at Farm Machinery and Post Harvest Technology (FMPHT) Division, Bangladesh Rice Research Institute (BRRI), Joydebpur, Gazipur, Bangladesh, during November 2014 to May 2015. Various technical and economic aspects of the chopper namely chopped straw length, chopping capacity and efficiency, fuel consumption, power requirement and cost of operation were evaluated on the basis of RNAM tests code. The chopping operation was performed using four different combinations of gear ratios (e.g. 22:38, 38:22, 16:44 and 44:16) for both type of prime mover. The average lengths of chopped straws were found 15.70 cm, 2.30 cm, 10.70 cm and 3.83 cm (when operated with engine) and 11.06 cm, 1.74 cm, 7.70 cm and 2.65 cm (when operated with motor) at gear ratios 16:44, 44:16, 22:38 and 38:22 respectively. The maximum output capacity of the chopper machine was found as 1018.21 kg/hr when operated with diesel engine at 38:22 gear ratios. In case of electric motor the highest output capacity of the chopper machine was observed as 1070.51 kg/hr at 44:16 gear ratios. The operating costs of the BRRI power chopper, manual and traditional sickle chopping were found 122 Tk./ton, 2000 Tk./ton and 3000 Tk./ton at output capacity 1018.21 kg/hr , 43 and 15 kg hr-1, respectively.

Asian Journal of Applied Science and Technology, 2020

Maize and sorghum stalk considered among the most fodder materials in Ethiopia. Therefore the chop machine was adapted and evaluated. The research was conducted at Asella Agricultural Engineering Research Center (AAERC), Arsi Negelle and Zuway Dugda districts to evaluate the machine performance in terms of chopping efficiency, throughput capacity, cutting efficiency and fuel consumption at different speed of cutter shaft. The output of chopper was found to be remarkable achievement. The chopping efficiency was decreased from 97.28 to 92.43 % on maize stalk and 95 to 90.2 % on sorghum stalk as rpm increases from 1150 to 1850 respectively. Throughput capacity of chopper was increases from 8.13 to 12.6 kg/min on maize stalk and 10.26 to 14.5 kg/min on sorghum stalk as rpm increases from 1150 to 1850 respectively. The mean of chopping length and cutting efficiency of 3.5 cm and 96.64 % on maize and also 2.53 cm and 97.63 % on sorghum stalk respectively.

A capability to provide a large variety of bunch patterns is crucial for the concept of the Project X serving MW-range beam to several experiments simultaneously. This capability will be realized by the Medium Energy Beam Transport's (MEBT) chopping system that will divert 80% of all bunches of the initially 5mA, 2.1 MeV CW 162.5 MHz beam to an absorber according to a pre-programmed bunch-by-bunch selection. Being considered one of the most challenging components, the chopping system will be tested at the Project X Injector Experiment (PXIE) facility that will be built at Fermilab as a prototype of the Project X front end. The bunch deflection will be made by two identical sets of travelling-wave kickers working in sync. Currently, two versions of the kickers are being investigated: a helical 200 Ohm structure with a switching-type 500 V driver and a planar 50 Ohm structure with a linear 250 V amplifier. This paper will describe the chopping system scheme and functional specific...

2010

This paper presents conventional Power control method for Separately Excited DC motor using specifically designed simulation software package PSIM for Power Electronics and motor control. Armature voltage control is preferred because of high efficiency and good speed regulation for dc motors. The speed control of separately excited dc drive can be done using four quadrant chopper up to rated speed. Choppers are widely used for traction motor control in transportation systems. Power control interprets as FORWARD/REVERSE MOTORING of DC drive.

IEEE Transactions on Industrial Electronics and Control Instrumentation, 1975

2013

This is to certify that the thesis entitled "Speed Control of DC Motor Using Chopper", submitted by Abhishek Kumar Sinha (Roll. No. 109EE0309) and Badal Kumar Sethy (Roll. No. 109EE0304) and in partial fulfilment of the requirements for the award of Bachelor of Technology in Electrical Engineering during session 2012-2013 at National Institute of Technology, Rourkela. A bonafide record of research work carried out by them under my supervision and guidance. The candidates have fulfilled all the prescribed requirements. The Thesis which is based on candidates' own work, have not submitted elsewhere for a degree/diploma. In my opinion, the thesis is of standard required for the award of a bachelor of technology degree in Electrical Engineering.

Advances in Science and Technology Research Journal

TCRLS, 2020

This project is to regulate the speed of the motor below the base speed. Conventionally armature control method is used with rheostat, but using rheostat causes more losses. So, to regulate the armature voltage the chopper is used instead of the rheostat. The dc machine is separately excited through field winding. The chopper circuit gets signals from the controller and then supplying variable voltage to the armature of motor the desired speed is obtained in the motor. Chopper converts from dc fixed voltage to variable voltage; it can be step up or step down. In an open loop system the output speed may be erroneous; practically the speed of the motor might slightly be less at a predetermined voltage. To rectify this issue, closed loop method is preferred. The error signal is determined from the difference of the actual speed and desired speed. Here PI controller is used, as the proportional term does the job of fast correction and the integral term takes finite time to act and makes the steady state error zero, delay can be removed. In treadmill machine, railway engines (traction), E-bikes, e-bicycles, e-scooters, portable sewing machine, drill machine etc, in which speed control of motor through chopper is practically used. The simulation is done in MATLAB under varying load condition, varying reference speed condition and varying input voltage.

Computer and Computing Technologies in Agriculture XI, 2019

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