Speed Control Of Three Phase Slip Ring Induction Motor Using Static Rotor Resistance Control Using Rectifier & Chopper

Microcontroller based PWM 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

• 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
• QEP Sensor /Hall sensor/Speed sensor(Proximity)Interface connector on front panel
• PWM increment & decrement key &Reset switch is provided
• 20 X 4 LCD screen &PWM outputs are terminated by Front panel Connector 230VA INPUT with Power ON/OFF switch

IGBT power module (Voltage source Inverter)

This power module is designed by using IGBT based Smart Power Module (SPM) from “FAIRCHILD SEMICONDUCTORS” for AC/DC Motor control application. This power module can be used for AC, DC, BLDC, PMSM Motor application by proper external PWM controller interfacing (like Dspic , FPGA & DSP). This Module consists of

IGBT

• One Number of SPM-Smart Power Module ( Model FSBB20CH60B ) Rating @ 600V , 20A based Voltage source inverter Power circuit
• SPM-IGBT is fixed with suitable heat sink and snubber circuit for protection
• IGBT Power circuit input and outputs are  terminated by suitable rating banana connectors in front panel with necessary indication

DIODE RECTIFIER

• One number of diode rectifier ( 600V @ 35A ) is provided to converter input AC voltage to DC Bus voltage
• DC Capacitor is provided ( centre point type) at diode rectifier output side for Filter
• Analogue DC Voltmeter is provided to measure DC Bus voltage

PWM ISOLATOR

• Six Number of PWM Isolator IC (6N137) is used to isolate All the six PWM signals input
• One number of +15V@1amp fixed dc power supply is provided for PWM Isolator input side for power excitation
• One number of +5V@1amp fixed dc power supply is provided for PWM Isolator Output side power excitation

PWM Driver

• Built in IGBT Gate Driver is provided in SPM for IGBT Gate signal amplification.

SENSORS

• 3 numbers of Hall effect current sensor @ 25A is provided for 3Ø output AC/DC Current measurement
• 1 numbers of Hall effect current sensor @ 25A is provided for Input DC bus Current measurement
• Op-Amp based Signal conditioner circuits are provided in all sensors for output current signals amplifications
• All current sensor signal conditioner circuit outputs are terminated in front panel by suitable connectors

PROTECTION CIRCUIT

• One number of automatic trip circuit is provided for O/C protection
• LED is provided for trip status indication
• Reset switch is provided for TRIP RESET

CONNECTORS

• One number of 34 pin FRC Connector is provided for PWM input signal input and feed back
• Banana connectors are provided for AC input
• Banana connectors are provided for 3 phase output
• Test points are provided for PWM signal and Current wave form measurements
• MCB is provided at input side for Input supply ON/OFF

SPECIFICATION

• Power Circuit
• Input             :           0-230VAC , 50 HZ (or) 0-300VDC
• Output                                     :           3 Ø 200V @ 5A , Variable Voltage ,

Variable frequency ( OR) 0 +/- 280VDC

• PWM Section
• Number of PWM Input             :           6
• Maximum PWM Frequency :           15KHZ
• PWM Level             :           0-5V (TTL)

 Slip ring Induction with load set up

• Type             :           3 phase Slip Ring Induction Motor
• Power :           1 hp
• Voltage             :           415VAC &220V ROTOR
• Speed                                                 :           1500 RPM
• Feedback sensor             :           Proximity sensor
• Loading             :           spring balance loading
• Make             :           BENN /RAMSON/OMEGA

 Spring balance Loading

• 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

Loading Rheostat

• One number of single phase loading rheostat-3kw with different load selector switch is provided