Important: Use custom search function to get better results from our thousands of pages

Use " " for compulsory search eg:"electronics seminar" , use -" " for filter something eg: "electronics seminar" -"/tag/" (used for exclude results from tag pages)
Ask More Info Of  A Seminar Ask More Info Of A Project Post Reply  Follow us on Twitter
09-05-2011, 11:51 AM
Post: #1
MICROCONTROLLER -BASED DC MOTOR SPEED CONTROLLER
Presented by:
KUSUM.N.M
VIJAYLAKSHMI


.docx  ELECTRICAL DRIVES PROJECT REPORT on.docx (Size: 414.75 KB / Downloads: 260)
INTRODUCTION
DC motor speed controllers are very useful for controlling the motion of robotic and industrial automation systems. The controller presented here uses the pulse-width modulation (PPWM) technique. The PWM wave for speed control is generated using Atmel AT89C52 microcontroller. To control the speed of the DC motor, you need a variable-voltage DCpower source. When the DC motor isswitched on, it takes certain time toreach the full speed. As soon as the power supply is switched on, the DCmotor starts gaining speed and if you switch off the power supply before itreaches the maximum rated speed, itstarts to slow down.
Circuit :
Parts List
Semiconductor:
IC1 -7806, 6V regulator
IC2 -AT89C51 microcontroller
T1 -TIP122 pnp transistor
D1-D6 -1N4007 rectifier diode
LED1 -5mm light-emitting diode
Resistors (all ¼-watt, 5% carbon):
R1 -330-ohm
R2 -10-kkilo-oohm
R3 -1-kilo-oohm
R4-RR11 -
220-ohm
Capacitors:
C1 -1000 µF, 5V electrolytic
C2, 3 -0.1µF ceramic disk
C4, 5 -22pF ceramic disk
C6 -10 µF, 6V electrolytic
Miscellaneous:
X1 -230V C primary to V,
500mA secondary transformer
S1-SS3 -Push-to-on switch
S4 -On/off switch
X TAL -12MHz crystal
-6V C motor
CON1 -
Connector for power supply
Circuit Description:
Fig. 1 shows the circuit of the DC mo-tor speed controller. 230V AC mains is stepped down by transformer X1 to deliver secondary output of 9V, 500 mA. The secondary output is rectified by a full-wave bridge rectifier comprising diodes D1 through D4,filtered by capacitor C1 and regulated by IC 7806 Capacitor C2 bypasses any ripple present in the regulated output. LED1 acts as the power- ‘on’ indicator. Resistor R1 limits the current passing through LED1.Diode D5 causes a voltage drop of 0.6V and, as a result, the final output of the circuit is approx.44V.
Construction:
IC AT89C51 is a low-power, high-performance, 8-bit microcontroller with 8 kB of Flash programmable and eras-able read-only memory
(EPEROM),256 bytes of RAM,32 input/output (I/O)lines, three 16-bit timers/counters, a six-vector two-level interrupt architecture, a full-duplex serial port, on-chip oscillator and clock circuitry.
In addition, the AT89C51 is designed with static logic for operation down to zero frequency and supports two software- selectable power-saving modes. The idle mode stops the CPU while allowing the RAM, timers/counters, serial port
and interrupt system to continue functioning.
The power-down mode saves the RAM contents but freezes the oscillator, disabling all other chip functions until the next hardware reset is activated.
At the heart of the speed controller system is microcontroller AT89C52
which creates (using timer 0)pulses of varying width for pulse-width modulation and controls the motor speed.
To change the speed of the motor, switches S2 and S3 are interfaced to
interrupt the input to pins P3.22 and P3.33 of IC2,respectively.Whenever any of
switches S2 and S3 is pressed, an interrupt is generated, which changes the duty
cycle of the pulse train. Switch S2 interfaced to Interrupt-0 increases the
duty cycle of the pulse waveform, whereas switch S3 interfaced to Inter-
rupt-11 decreases the duty cycle of the pulse waveform. Power-on reset for
the microcontroller is achieved through capacitor C6 and resistor R2.Switch S1
provides manual reset to the microcontroller. A 12MHz crystal (XX TAL ) is used for basic clock frequency. Port 2 is an 8-bit,bidirectional, input/output (II/O) port with internalpull-ups.Port-2 output buffers can sink/source four TTL inputs.
The software is written such that the duty cycle for PWM is increased in discrete intervals of ‘10 ’.Hence the speed of the DC motor is divided into eleven steps from Port pin P1.11 is internally pulled up. It is used as the output to control the motor with driver transistor T1. Whenever timer-0 overflows, the status of pin P1.1 is complemented and hence a square wave with appropriate duty cycle is generated. This pin is inter-faced to power transistor TIP122 (TT1),, which is fed to drive the motor. When the transistor is driven into saturation, current flows through the motor. When the transistor is cut off,
the motor current keeps flowing be cause of the motor ’s inductance. Diode
D6 connected across the motor coil prevents reverse current flow. A heat-sink
is fed with over transistor T1.
Rating MICROCONTROLLER -BASED DC MOTOR SPEED CONTROLLER Options
Share MICROCONTROLLER -BASED DC MOTOR SPEED CONTROLLER To Your Friends :- Seminar Topics Bookmark
Post Reply 

Marked Categories : ic17806, 3 dc motor controller using at89c51, microcontroller based dc motor speed controller, microcontroller based dc motor control, speed control of dc motor using microcontroller ppt, microprocessor based motor speed controller, microcontroller based pulse width modulation dc motor controller, microcontroller based motor control seminar topics in pdf, dc motor control microcontroller, speed control of dc motor using microcontroller ic at89c52 ppt, presentation of microprocessor based speed control of motor, microprocessor based speed controller ppt, using microcontroller control speed dc motor power point presentation, driver circuit for dvc motor,

[-]
Quick Reply
Message
Type your reply to this message here.


Image Verification
Image Verification
(case insensitive)
Please enter the text within the image on the left in to the text box below. This process is used to prevent automated posts.

Possibly Related Threads...
Thread: Author Replies: Views: Last Post
  Speed and Direction of DC motor using GSM seminar class 3 4,199 26-11-2014 10:20 AM
Last Post: mkaasees
  Gsm based dc motor control ppt study tips 2 822 21-11-2014 10:40 AM
Last Post: mkaasees
  simulation of hdlc controller using vhdl code subine 0 77 18-11-2014 04:42 PM
Last Post: subine
  pf based remote control system subine 0 86 18-11-2014 04:41 PM
Last Post: subine
  avilability based tariff subine 0 67 18-11-2014 04:22 PM
Last Post: subine
  ac motor protection subine 0 46 18-11-2014 03:51 PM
Last Post: subine
  dtc induction motor drives subine 0 59 18-11-2014 03:24 PM
Last Post: subine
  methodology for load compensation in four-wire electric power systems based on instat subine 0 73 18-11-2014 03:19 PM
Last Post: subine
  measurement of power factor using microcontroller subine 0 68 18-11-2014 03:10 PM
Last Post: subine
  vector control of induction motor subine 0 56 18-11-2014 03:09 PM
Last Post: subine
This Page May Contain What is MICROCONTROLLER -BASED DC MOTOR SPEED CONTROLLER And Latest Information/News About MICROCONTROLLER -BASED DC MOTOR SPEED CONTROLLER,If Not ...Use Search to get more info about MICROCONTROLLER -BASED DC MOTOR SPEED CONTROLLER Or Ask Here

Options: