Speed Control Of Seperately Excited Dc Motor By Varying Armatute Voltage Using Three Phase Half & Fully Controlled Bridge Converter

Digital PWM /Firing Pulse Controller

This PWM/Firing pulse controller is designed based on Dspic30f4011 controller chip from “MICROCHIP” company  and  this controller can be used  to generate  PWM Signals for SCR, IGBT based power electronics application like DC-AC Inverter ,DC-DC Chopper & SCR  converter based AC/DC/BLDC Switched Reluctance Motor (SRM) control application. PWM output of this controller can be directly interfaced with Power Module through External cable connection.

 Features

• One number of Digital Controller (dsPIC30F4011) provided for PWM Generation.
• Microchip’s dsPIC30F4011 16 bit digital signal controller operating at 33 ns, On chip motor control peripherals, 6 motor control PWM with programmable dead band, quadrature Encoder interface Memory (On-chip)
• 48k Flash program memory, 2k RAM for data memory,1k EEPROM memory, On chip isolated serial port
• ADC input lines are protected and terminated
• Bead inductances are provided at VCC & GND for EMI rejection
• Five Number of Touch Key Provided for PWM Mode Selection
• One number of LCD provided to indicate Motor set speed, actual speed, chopper mode etc
• One Number of toggle switch provided for PWM Enable / Disable selection
• +5V 1Amp isolated dc supply provided for control circuits.
• All are mounted in a powder coated cabinet with stickered front panel mimic diagram indication
• 230VAC input, one number of power On/Off switch with indication
• One number of 15 pin connector provided for PWM output to external power module
• One number of 9 pin connector provided for Speed sensor Interface

• 7 Numbers of test points provided in the front panel for waveform measurements.

3Ø SCR POWER MODULE-10A

This power module is designed by using SCR & DIODE  for 3 Phase AC-DC Controlled Converter applications This power module can be used for DC Motor open loop & closed loop speed control application by   external PWM controller interfacing

• SCR based 3 phase Half & Fully Controlled Converter
• SIX numbers of SCR, Ratings @ 1200V @ 50A, fixed With proper heat sink for cooling and Snubber circuit

• Two numbers of Diode ( 50A , 1200V) with With proper heat sink for cooling and       Snubber circuit

• 6 numbers of Pulse amplifier & 1;1 Pulse transformer for all pulse isolation
• One numbers of 3 Phase 230/9V Supply synchronizing transformer & ZCD Circuit is provided for SCR Pulse generation
• MCB provided for input power ON/OFF
• SCR &Diode outputs and AC inputs are terminated in banana connector
• Specifications- Input- 3 phase 440VAC, Output – 0-600V AC/DC @ 25A

 DC Shunt Motor with load set up

• Type             :           DC Shunt Motor
• Power :           1 hp
• Voltage             :           200vdc for Armature & Field
• Speed                                                 :           1500 RPM
• Feedback sensor             :           Proximity sensor
• Loading             :           spring balance loading
• Make             :           BENN /RAMSON/OMEGA
• One number Brake DRUM with spring balance set up is coupled with the above motor
• Two numbers of dial indication for Load in Kg measurement All are mounted on a powder coated mechanical set up