Stretch film
packaging machine of the electrical control system of dc motor.
Stretch film
packaging machine dc motor has good start, braking and speed regulating performance, easy control, therefore, the early need stepless adjustable Settings much use dc motor speed control.
Dc motor series and shunt, compound and his wound.
The following will introduce stretch film packaging machine of the electrical control system of dc motor.
a, stretch film packaging machine of the electrical control system of dc motor of the principle and the cause of the dc motor armature resistance start
stretch film packaging machine of the electrical control system of dc motor.
Stretch film vacuum packaging machine current of dc motor is started directly is very big, usually reach 10 ~ 20 times the rated current, produce very big start torque, it is good for motor starting, but too much easy to damage the armature winding of the motor torque and commutator, therefore, startup resistor in series with the armature can decrease the starting current.
in addition, separately excited dc motor at weak or zero magnetic, produce & other;
Speed & throughout;
Phenomenon, therefore the armature before electricity, the first in the excitation circuit connected to the 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, stretch film packaging machine dc motor armature resistance one-way startup control process
stretch film packaging machine of the electrical control system of dc motor.
Stretch film packaging machine direct current motor electric box series resistor startup method is more, there are the principle of speed start, the principle of current start and time started, the following will introduce respectively.
1, the principle of stretch film packaging machine speed start
dc motor armature resistance one-way stretch film packaging machine start line as shown in figure, first close the power switch Qs1, excitation loop current, when the push button SB2, electrical contactor coil of KM1, KM 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 R3: when the speed increases to a certain value, the speed relay KS1 normally open contacts are closed, the resistor in series with the armature is reduced, only resistance R2 and R3 series with the armature, as the speed of the motor continue 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 the excitation circuit of a power outage, electromotive force is induced in the coil, winding R4 MD, resistance and diode of DVD release, protection, VD and called the fly-wheel diode.
2, stretch film packaging mechanical and electrical flow principle start
stretch film packaging mechanical and electrical flow principle of dc motor armature resistance one-way start-up circuit.
Closed the power switch first, then press the start button SB2, time relay KT coil and contactor to electricity at the same time, by the coil in KMl KM1 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, making KM2 coil can not have electricity.
when the speed increases to a certain speed of the motor, the armature current, 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 start, 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, stretch film packaging machine time principle start
stretch film packaging machine time principle of the dc motor armature resistance one-way start-up circuit.
Closed the power switch Qs1, and 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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