V Instruments

Speed Control of DC Series Motor using SCR DC Chopper (Jones Chopper)

Speed Control of DC Series Motor using SCR DC Chopper (Jones Chopper)
Speed Control of DC Series Motor using SCR DC Chopper (Jones Chopper)
single phase loading rheostat-3kw
Previous
Next

This trainer is designed to study the open loop speed of dc series motor using SCR Based DC-DC Chopper circuit (Jones Chopper). This set up consists of,

  • Microcontroller based Firing Pulse /PWM Controller
  • Jones Chopper Power circuit-1KW
  • DC Series Motor with Load setup
  • Accessories

 Microcontroller based PWM Controller

This PWM controller is designed based on Dspic30f4011 controller chip specially designed for Power Electronics & Motor control applications from “MICROCHIP” company  and  this controller can be used  to generate  PWM Signals for SCR DC-DC Chopper  based DC Motor speed control application. PWM output of this controller can be directly interfaced with Power Module through External cable connection.

Features

  • Includes High-Performance Microchip dsPIC30F4011 Microcontroller with 48kb Internal Flash Program Memory.
  • 6 Numbers of PWM Outputs up to 15KHZ of switching frequency.
  • Internal EEPROM & Five 16-bit Timers.
  • Power, Programming and Test LED’s.
  • 2MB PROM & 24 Mhz clock speed.
  • USB – PGM Down loader & 6 Numbers of ADC input (Optional).
  • QEP Sensor /Hall sensor/Speed sensor(Proximity)Interface.
  • PWM increment & decrement key & Reset switch & LED’s for Sensor status.
  • 20 X 4 LCD screen & PWM outputs are terminated by 34 pin FRC Connector

 Jones Chopper Power circuit-1KW

This power module is designed by using SCR , Diode & Commutating components  for DC-DC Jones Chopper Circuits .This power module can be used for DC Motor open loop speed control application by   external PWM controller interfacing.

Specification

Input               :           0-2230VAC or 300VDC

Output :           0-200VDC

Capacity          ;           5A (Suitable for 1 hp dc Motor)

Power Circuits

  • Two number of 1200V,27A SCR with heat-sink is provided for Power circuit
  • One number of Power diode (25A,600V) & Inductor (Centre Tapped)-5A & Commutating Capacitor is provided to form JONES CHOPPER Power Circuit
  • Necessary Commutating Capacitor is provided to form JONES CHOPPER Power Circuit
  • 2Numbers of Pulse isolation & Amplifier circuits
  • SCR Pulse input terminated in front panel connector for external pulse input connection
  • MCB is provided for power circuit input ON/OFF & Protection
  • Single phase diode rectifier & Filter circuit is provided for AC-DC Conversion
  • DC Voltmeter ( 0-300VDC) is provided to indicate power circuit input dc voltage
  • All necessary test points are provided for external patching
  • All are mounted on a nice cabinet with sticker front panel with mimic diagram

DC Series Motor with Load setup

  • Type PMDC
  • Power 1 hp
  • Voltage 180V or 200VDC
  • Current 5A
  • Speed             1800 RPM
  • Make RAMSON
  • Sensors 1 Number of Proximity sensor for speed Measurement
  • Loading Spring balance load set up with Brake drum & Dial Indication

 Accessories-(for power circuit input)

  • One number of single phase Isolation transformer (230/110-0-110vac)-1KVA is provided
  • One number of single phase Autotransformer-2KVA is provided

 Note  –        Open loop speed control only possible by using the above set up due to forced commutation.