Inverter rope hoist application

1. Introduction inverter structure
Frequency conversion technology in the transmission tower hoist applications history, although some success application experience, there are a lot of inverter hoisting mechanism is now running the site, but compared with other industries, frequency conversion technology In the application of   rope hoist  tower far not reached the required level, which has cost reasons, there are technical reasons.
(1) drive brand is different, the use of different control loops;
(2) system is open-loop or closed-loop
(3) in the form of mechanical structure is not the same: L-type arrangement, п-type arrangement or a font layout, etc.;
(4) is not the same type of gear, such as: cylindrical gear reducer or planetary gear; ratio is fixed or variable speed ratio and so on.
On the drive control technology, the difference was not involved in the control of the above changes in the way, are using an inverter for speed control of a motor typical pattern can also be referred to as conventional inverter hoisting mechanism.
2. Conventional inverter hoisting mechanism design elements
(A) number of motor poles and power check
When lifting the basic parameters of a given institution, it has the number of poles of the motor and the power of determination and calculation, the point is:
a) motor output speed should be less than 3000 rev / min; rated torque for checking maximum weight;
b) the system should be less than the maximum operating frequency of 100Hz; when selecting the motor power, according to the above conditions will be able to determine the basic gear reduction ratio and the motor power and the number of poles.
(2) electrical control system design
a) the selection of the inverter
When the system's electric motor is determined, you can proceed with the control system design. Tower hoist for  lift hoist   it would be best used with a vector control function or is a DTC Direct Torque Control function of the inverter, the designer according to their level of familiarity, technical support, and other industries, the use of plant and other factors to choose.
b) the selection of energy resistance
As   Wire rope hoist  with inverter system, its design focuses on the state motor is in regenerative braking system reliability. This requires the designer to clearly understand the working process feedback frequency transmission only.
Most of the drive chain hoist product description on how to choose the resistance value of the energy and power are not very clear description, and often their recommended standard does not fully meet the requirements of lifting working conditions.