একটি ডিসি মোটর ব্যাপকভাবে একটি সুনির্দিষ্ট গতি নিয়ন্ত্রণ এবং একটি ধ্রুবক ঘূর্ণন সঁচারক বল পছন্দসই যেখানে শিল্প অ্যাপ্লিকেশনের জন্য ব্যবহৃত হয়. এটি যদি ক্ষেত্রের বর্তমান আপনি ব্যস্ত সমানুপাতিক. যদি ক্ষেত্রের কিছু r বর্তমান ব্যর্থতার ক্ষেত্রে, মোটর গতি বিপজ্জনক উচ্চ স্তর ওঠা হবে. ক্ষেত্রের ব্যর্থতা সুরক্ষা সেইজন্য যদি ক্ষেত্রের বর্তমান ব্যর্থতার ক্ষেত্রে armature সরবরাহ ছিন্ন করা প্রয়োজন.
PART LISTS
RESISTOR
R1 Pick-up Resistor 5 Ohm, 25 W
R2 300 Ohm
All R 20K , 25W
S Shunt Regulator
FUSE F1,F2,F3,F4 Fuse
DIODE All 1N4007
LED Light Emitting Diode
CAPACITOR C2,C3 N/O Contactor
All 200μF
OTHERS M DC Motor
F1 Shunt Filed
RE Field Failure Relay
A1 Field Ammeter
A2 Armature Ammeter
CIRCUIT DESCRIPTION
The basic circuit of the field failure protection uses an ordinary 6V electromagnetic relay of the open type with I0 amps rated sturdy contacts. This relay can be used on a manual auto transformer-controlled DC drive and motorized or thyristor controlled drives. This motor has a shunt field current of 1.13 amps at 220V DC. A 5-ohm (25~watt) wire-wound resistor (R1) connected in series with the motor field produces a 5.6-volt drop across resistor (R1) as long as the field current exists, thus energizing the 6V DC relay connected across the resistor as shown in the diagram below
The limit switch S3 is actually a part of the auto transformer, and it is so mounted that its contacts remain closed only when the auto transformer setting is at zero position. At all other settings of the auto transformer, the limit switch contacts remain open. This is a safety device introduced, so that the motor can be started only from the minimum position of the auto transformer setting, thereby starting at reduced voltage and current. If the motor is started on a high armature voltage, the starting current will be very high, especially if started on load, as is usually the case.
PART LISTS
RESISTOR
R1 Pick-up Resistor 5 Ohm, 25 W
R2 300 Ohm
All R 20K , 25W
S Shunt Regulator
FUSE F1,F2,F3,F4 Fuse
DIODE All 1N4007
LED Light Emitting Diode
CAPACITOR C2,C3 N/O Contactor
All 200μF
OTHERS M DC Motor
F1 Shunt Filed
RE Field Failure Relay
A1 Field Ammeter
A2 Armature Ammeter
CIRCUIT DESCRIPTION
The basic circuit of the field failure protection uses an ordinary 6V electromagnetic relay of the open type with I0 amps rated sturdy contacts. This relay can be used on a manual auto transformer-controlled DC drive and motorized or thyristor controlled drives. This motor has a shunt field current of 1.13 amps at 220V DC. A 5-ohm (25~watt) wire-wound resistor (R1) connected in series with the motor field produces a 5.6-volt drop across resistor (R1) as long as the field current exists, thus energizing the 6V DC relay connected across the resistor as shown in the diagram below
The limit switch S3 is actually a part of the auto transformer, and it is so mounted that its contacts remain closed only when the auto transformer setting is at zero position. At all other settings of the auto transformer, the limit switch contacts remain open. This is a safety device introduced, so that the motor can be started only from the minimum position of the auto transformer setting, thereby starting at reduced voltage and current. If the motor is started on a high armature voltage, the starting current will be very high, especially if started on load, as is usually the case.
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