Corn continuous vacuum
packaging machine of the electrical control system of dc motor.
Corn continuous vacuum packaging machine dc motor has good start, braking and speed control performance, easy control, therefore, the early need to stepless speed regulation of occasions use dc motor speed control.
Corn continuous dc motor has a series vacuum
packing machine, shunt, compound excitation with him.
Then introduce the corn continuous vacuum packaging machine dc motor start.
1, the reason and principle of dc motor armature resistance start
corn continuous vacuum packaging machine of the electrical control system of dc motor.
Corn continuous vacuum packaging machine current of dc motor is started directly is very big, usually 10 - to reach the rated current
20 times, produce very big starting torque, it is good for motor starting, but excessive torque is easy to damage the electric box of the motor winding and commutator, therefore, automatic resistor in series with the armature can decrease the starting current.
in addition, corn continuous vacuum packaging machine separately excited dc motor in weak magnetic winners zero magnetic, can produce & other
Speed & throughout;
Phenomenon, therefore the armature before electricity access in the excitation circuit of excitation voltage, series resistance protection at the same time.
So the dc motor start control is based on the series resistance and the weak magnetic protection design.
2, one-way startup control dc motor armature resistance process
corn continuous vacuum packaging machine of the electrical control system of dc motor.
Corn continuous vacuum packaging machine dc motor armature resistance starting method is more, there are automatic speed principle, principle of current start and time, the following will introduce respectively.
1, the principle of speed start
corn continuous vacuum packaging machine of the electrical control system of dc motor.
Corn continuous vacuum packaging machine dc motor armature resistance one-way start-up circuit.
First close the power switch QS1, exciting circuit electricity, when SB2 button, contactor KM coil electricity, KM1 self-locking, the normally open contacts closed, normally closed contacts disconnect, armature current, due to the motor at the beginning of the start speed is low, speed relay all broken, so the series resistor R1, R2 and R31 when the speed increases to a certain value, the speed relay KS1 normally open contacts are closed, the series resistance in the electric box is reduced, the only resistance R2 and R3 string into the electric box, as the speed of the motor continues to rise, speed relay KS2 normally open contacts and KS3 normally open contacts has closed, series with the armature resistance are motor completely start from short circuit.
when corn continuous vacuum packaging machine, the excitation circuit of a power failure electromotive force is induced in the coil, winding MD, resistance of R4 and diode VD release circuit, protection, VD and called stream diode.
2, the principle of current start
corn continuous vacuum packaging machine of the electrical control system of dc motor.
Corn continuous flow vacuum packaging mechanical and electrical principle of the dc motor armature resistance one-way start-up circuit.
Closed the power switch Qs1, and then press the start button SB2, time relay KT coil and contactor KM of the coil to electricity at the same time, the KMI normally open contacts of the self-locking, the series with the armature resistance of the motor start, at the same time relay KA coil electricity, KA normally closed contacts disconnect, makes KM2 coil can not electricity, when the speed increases to a certain speed of the motor, the armature current decline, KA coil power is released, the normally closed contact closure, KM2 coil electricity, normally open contacts closed KM2, series with the armature resistance was short, motor in full swing.
The time relay is used when the moment, KT normally open contacts disconnect, ensure KM2 coil shall not electricity, and delay after a period of time, normally open contacts closed for KT, KM2 coil to prepare.
3, with the principle of activated
corn continuous vacuum packaging machine of the electrical control system of dc motor.
Corn continuous vacuum packaging machine time principle of the dc motor armature resistance one-way start-up circuit.
Closed the power switch QS1 first, then press the start button SB2, electrical contactor coil of KM1, normally open contacts of KM1 self-locking, series with the motor armature resistance R1 and R2, time relay KT1 coil electricity, delay after a period of time, KT1 closed normally open contacts, relay KA1 coil electricity, the normally open contacts closed, resistor R1 is sub, KT2 coil electricity, at the same time delay after a period of time, KT2 normally open contacts closed, KA2 coil electricity, the normally open contacts closed, resistance R2 nipple, motor in full swing.
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