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Lab Manual for Mechatronics - Mech by Rashika Sinha

  • Mechatronics - Mech
  • Practical
  • Savitribaai Phule University Pune - SPPU
  • Electronics and Communication Engineering
  • B.Tech
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Mechatronics T.E. (E&TC) POSITION CONTROL SYSTEM position—the operator does this by observation. By contrast a car's cruise control uses closedloop feedback, which classifies it as a servomechanism. 2. Servo Motor A servomotor is a specific type of motor that is combined with a rotary encoder or a potentiometer to form a servomechanism. This assembly may in turn form part of another servomechanism. A potentiometer provides a simple analog signal to indicate position, while an encoder provides position and usually speed feedback. Servomotors are used for both high-end and low-end applications. On the high end are precision industrial components that use a rotary encoder. On the low end are inexpensive radio controls servos (RC servos) used in radio-controlled models which use a free-running motor and a simple potentiometer position sensor with an embedded controller. Potentiometers are subject to drift when the temperature changes whereas encoders are more stable and accurate. Fig 1. Servo Mechanism in DC Servo Motor using Potentiometer as feedback • Applications i. Position control ii. Speed control iii. Military: fire-control and marine navigation equipment iv. Remote control airplanes, ‘DEPT. OF E&TC, BVCOEW, PUNE-43’ Page 2

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Mechatronics T.E. (E&TC) POSITION CONTROL SYSTEM v. Automatic navigation systems on boats and planes, vi. Antiaircraft-gun control systems. vii. autofocus cameras viii. A hard disk drive ix. Satellite-tracking antennas Fig 2.Parts of DC Servo Motor with potentiometer as feedback element 1.1 KIT FEATURES: ▪ Sensor type - Photoelectric type o IR Light Source ▪ High reliability ▪ High radiant intensity ▪ Peak wavelength λp=940nm ▪ 2.54mm Lead spacing ▪ Low forward voltage ▪ Pb free ▪ The product itself will remain within RoHS compliant version. ▪ Dimension: 5 mm Diameter ▪ Chip material: GaAlAs ▪ Lens colour: Blue ▪ Continuous forward current: 100 mA ▪ Peak Forward Current: 1 A ▪ Power Dissipation at 25⁰ Centigrade: 150 mW. ‘DEPT. OF E&TC, BVCOEW, PUNE-43’ Page 3

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Mechatronics T.E. (E&TC) o ▪ ▪ POSITION CONTROL SYSTEM IR Photo Diode ▪ Fast response time ▪ High photo sensitivity ▪ Small junction capacitance ▪ Pb free ▪ The product itself will remain within RoHS compliant version ▪ Chip Material: Silicon ▪ Lens Colour: black ▪ Range of spectral bandwidth: 1100 nm ▪ Wavelength of peak sensitivity: 940 nm. ▪ Reverse Voltage: 32V ▪ Power Dissipation at 25⁰ Centigrade: 150 mW. ▪ Reverse light current: 35 uA. ▪ Reverse dark current: 5 nA. DC Motor o 300RPM 12V DC motors with Gearbox o 3000RPM base motor o 6mm shaft diameter with internal hole o 125gm weight o 0.35kgcm torque o No-load current = 60 mA(Max), Load current = 300 mA(Max) Data Processing Unit o Atmega 328P based Arduino Platform o Clock: 16 MHz 1.2 FRONT PANEL SECTIONS DESCRIPTION: Front panel is divided into various sections. The details are as given below: a) Power supply b) Encoder Section c) Position/Velocity Selection Section ‘DEPT. OF E&TC, BVCOEW, PUNE-43’ Page 4

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Mechatronics T.E. (E&TC) POSITION CONTROL SYSTEM d) Velocity Adjust Section e) Signal Conditioning Section f) Reset section g) Measure section • ENCODER SECTION: Encoder is comprised of DC motor with Encoder Disc, Encoder Dial, a Photo Source and a Photo Sensor. 12V DC motor is operated using PWM/non-PWM based motor driver. The controller drives the motor using a driver. Encoder Dial is fixed on the bottom of DC motor and is stationary. It is provided with a scale in degrees for position measurement. Encoder Disc is a circular plate having equidistant holes on its periphery. The disc is mounted onto DC motor shaft and hence rotates as motor starts rotating. Photo Source and Photo Sensor are mounted on a C shaped clamp. This clamp is positioned in such way that when disc rotates, it positions Photo Sensor to one side and Photo Source to other side of the disc. Hence, they are positioned exactly opposite to each other. Fig. 2: Encoder Section ‘DEPT. OF E&TC, BVCOEW, PUNE-43’ Page 5

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