Inverter applications in transportation machinery
Conveyor chain can be divided into the Dabie conveyor belt, belt conveyor, spiral conveyor, roller conveyors, vibrating conveyors, bucket conveyors, etc.; depending on the
haulage of the physical properties of objects, chemical properties, shape and size of the shape transport path, handling methods and the results or demand
Different, in the selection, should function, characteristics, economic considerations, etc., which selected the most appropriate conveyor.
But in addition to these suits, today's production line has been gradually factory automation and conveying requirements to be able to automatically and effort. This
responsibility is a natural addition to the special variable speed drive of the conveyor according to variable speed-oriented approach is traditional also had mechanical rubber belt conveyor
stepless speed change and the
Kind of variable speed electric type, but the choice of having a controlling, maintenance and economical way of superb inverter drive, increasing.
The advantage of inverter drives
One can take advantage of squirrel cage induction motor: This type motor body is small, you can not like a mechanical gearbox transmission portion of space, the drive can be
shaped small and light; Any further transmission device is attached, the multiplier effect. No brushes or commutator, and thus the base almost maintenance-free.Incline Belt conveyor
2 can be set using only the electric motor, in both the circuit design can be inserted into the drive speed of the conveyor must, of transformed for the stepless speed change.
3. Improve production performance: Using inverter drive that wide range of 1:10 to 1:20 speed control is the remote control to change the number of instruction cycles will be
able to do it so easy to choose the most suitable job requires speed, particularly with the use of a vector control conversion mode, you can reach 1:100 speed control
System range, with as much as the PG speed control range 1:1000 optional operation.
4 can be submissive to start and stop: Conveyor speed as affected by rapid speed, the subject matter will be sent crashing down, for example, glass suddenly stopped moving, then
the bottle and the bottle collide, could result in damage; provided that if the inverter operation, Because it was a low frequency to start, so that the shock is small, and then
Supple manipulation adjust the setting time is really smooth and supple to change the speed, the whole can secure wishful helps product safety, to ensure quality.
5 able to function frequently, stop and reverse:
a. Inverter Frequency domain and from a low voltage starting, slowly rising Frequency and voltage values, so compared to the commercial power directly starter starter good
efficiency, the current small starting torque produced results motor heat, get over frequent starting, stopping and harmless
b. forward or reverse is controlled by the inverter transistor switching phase rotating derived. this way than the previous phase of the main circuit by way of switching wires,
there is no part of the movable portion and the friction, heat will be less more, so you can come back to use as horizontal as frequently anti-clockwise
6 may be electrically braking deceleration when the supply frequency of the motor output will slowly decrease, the motor speed will exceed the synchronous speed situations.
Occurs in this state, the energy recovery motor is inverter DC power source unit of the capacitor Absorption (DC hypertension); when it
Up to a certain standard, the transistor will be automatically opened and closed and the discharge of the electrical energy it consumes part of the resistor so that the
rotational energy to the load through the motor regenerative role for the generator is converted to electrical energy conversion drive-in resistors is the thermal energy which
is consumed by the regenerative system
Without using the resistor, the motor may still have internal losses of 20% of the level of braking force. Conveyor is generally constant torque load, so as not necessary rapid
deceleration, then no need to set many situations since the braking resistor For less frequent occasions brake, then also a self-
High-speed flow of DC current to the motor way and achieve the target braking force; known as dynamic braking.
Electrical brake (braking) advantages can stop at the specified location, even if the motor is running at high speed; also can make it from low speed to quickly reach the kind
of creeping crawling like amble speed and shorten the work cycle time operation frequency to change the motor speed
Climb, then this electric brakes with produce, hand in hand, do not have to operate under the guise of manpower, especially conveyor conveying the shape stake amount, when it
incurred a negative torque motor-ridden, the electrical braking action to prevent the motor on That could happen dramatically speed up the hazards
7 easy to change the speed
As long as the motor frequency increase supply, conveyor speed is increased; For existing transportation equipment, but also to increase their levels of 10 to 20% transmission
capacity is simple and easy to do. Should pay attention to is the need to have surplus capacity of the motor and the need to comply with "no more than the gear capacity
Xu number of revolutions as the constraint conditions. "