High-speed DC Motor Research Articles

Identification of RBC and WBC Count in Human Blood Using ARM Based Instrumentation

The rapid growth in microelectronics and crunching RISC in the field of bio-medical sciences incorporated of soft tools to diagnose various parameters of human fluids. Conventional method of blood sample analysis makes use of laboratory technique of titration, which is operator-dependent and results in lot of errors depending on the skill of the technician. In order to eliminate the human errors involved in the conventional method, in this paper an attempt has been made to present a capillary centrifuge technique driven by high speed DC motor fed by Morgan chopper and controlled by powerful ARM processor. It results in accurate analysis of the blood samples. The various techniques involved in accurate sensing of speed using timer and generation of firing pulses to thyristor in the Morgan chopper is judiciously achieved. This paper clearly brings out the advantages of the proposed blood measurement technique which effectively gives blood analysis faster and at a low cost.

Robust Navigation Scheme Using Radio Frequency Technology and Mobile Robot

Indian railways are one of the largest railway networks of the world. Despite the huge size, the rampant negligence and lack of maintenance have created a number of problems. The main problem being that, frequent cracks are found in the rail lines which cause derailments leading to huge loss of life and property. In fact, the year 2010 alone, reports around 21 train crashes leading to around 450 deaths. Having researched about the conventional methods of railway crack detection includes ultrasonic and eddy current based approaches, we find that their expensive nature does not warrant their use in the current scenario. Hence, we aim to create a new LED-LDR based simple technique to detect cracks in rails that will be cheap enough, so that it can be put to mass usage. Our scheme consists of a robot which will traverse the railway line looking for cracks during night time when local railways don't operate. This mobile robot will be powered by a DC to motor traverse the railway line. It will be equipped with a LED(Light Dependent Resistor) and LDR arrangement. When a crack is present in the railway line the light falls on the LDR and its resistance decreases. This is detected by a microcontroller which then stops the motor. Navigation in robotics usually requires solving two major problems, one is position of the robot and the other is motion control mechanism. In case, no prior information in the motion environment can be obtained, the challenge becomes worst. This problem happens due to the lack of mobility information in its surroundings. In this particular method controlling is finished dependent upon the feedback offered by the sensor. In this present work, different modules like controlling module and Wireless unit module Sensing are introduced. In the sensing module, whenever the micro controller is powered along the high speed DC motors. Sensor is connected to the robot. Encoder connected to the robot, which transmit the comprehensive data continuously. Here the robot is comprised of transmitter and receiver. Here the repetitiveness used is 433 kHz.

A comprehensive study of spin coating as a thin film deposition technique and spin coating equipment

Description and theory of spin coating technique has been elaborately outlined and a spin coating machine designed and fabricated using affordable components. The system was easily built with interdisciplinary knowledge of mechanics, fluid mechanics and electronics. This equipment employs majorly three basic components and two circuit units in its operation. These include a high speed dc motor, a proximity sensor mounted at a distance of about 15 mm from a reflective metal attached to the spindle of the motor to detect every passage of the reflective metal at its front and generate pulses. The pulses are transmitted to a micro-controller which process them into rotational speed (revolution per minute) and displays it on a lead crystal display (LCD) which is also a component of the micro-controller. The circuit units are a dc power supply unit and a PWM motor speed controlling unit. The various components and circuit units of this equipment are housed in a metal casing made of an 18 gauge black metal sheet designed with a total area of 1, <TEX>$529.2cm^2$</TEX>. To illustrate the use of the spin-coating system, ZnO sol-gel films were prepared and characterized using SEM, XRD, UV-vis, FT-IR and RBS and the result agrees well with that obtained from standard equipment and a speed of up to 9000 RPM has been achieved.

A Peristaltic Micro Pump Driven by a Rotating Motor with Magnetically Attracted Steel Balls

In this paper, we present a membrane peristaltic micro pump driven by a rotating motor with magnetically attracted steel balls for lab-on-a-chip applications. The fabrication process is based on standard soft lithography technology and bonding of a PDMS layer with a PMMA substrate. A linear flow rate range ∼490 μL/min was obtained by simply varying the rotation speed of a DC motor, and a maximum back pressure of 592 Pa was achieved at a rotation speed of 43 rpm. The flow rate of the pump can also be adjusted by using steel balls with different diameters or changing the number of balls. Nevertheless, the micro pump can also work in high speed mode. A high back pressure up to 10 kPa was achieved at 500 rpm using a high speed DC motor, and an utmost flow rate up to 5 mL/min was reached.

A high torque to weight ratio robot actuator

SummaryA light-weight, high-torque actuator with accurate torque control capability is described. The actuator uses a small hydrostatic transmission to achieve the advantage of large gear reduction from a high speed DC motor, and retains accurate joint torque sensing and control capabilities with no backlash. A disadvantage of the actuator is that is introduces extra dynamics which must be accounted for in robot control systems. It is shown that state feedback enables closed loop control of joint torque, with full back drivability, through an effective gear ratio of 485:1 for the experimental system. The actuator can therefore be used for both position control and output force control, which is essential for modern robot control algorithms. A mathematical model of the system is presented in this paper along with experimental results.

Precise synchronization of high-speed DC motors

Abstract An electronic circuit has been developed which uses clock pulses to control and synchronize direct current electric motors operating at high velocities. The control functions with considerable precision, and can act to restore correspondence in phase when perturbations occur. Though specifically applied to regulate DC electric motors, the same logical principle can be adapted to other types of rotating mechanisms.