How To Choose The Motor Of Metallurgical Bridge Crane?
Feb 09, 2023
How to choose the motor of metallurgical bridge crane?
The lifting and operation of the 10 ton single-girder crane are inseparable from the use of the motor.
The relevant parameters of the single-girder bridge crane should be well known, and based on this, a rough selection can be made for the performance requirements of the single-girder bridge crane for the motor's starting, braking, speed regulation, load, torque, synchronization, etc. standard.
If a high-voltage motor with the same power is selected, on the one hand, the one-time investment is increased, and the efficiency is about 2% lower than that of the low-voltage motor. However, for those occasions where the power supply line is long, the grid capacity is limited, the starting torque is high, or the overload capacity is required, it is advisable to choose a high-voltage motor.
Selection of motor load characteristics: The operating characteristics of the motor are restricted by the load characteristics of the machinery it drives. The mechanical characteristics of the selected motor should be reasonably matched with the characteristics of the load it drives, so as to meet the requirements of energy saving and safe operation.
When choosing a motor, it is necessary to consider the model, type, rated speed, rated voltage, and rated power of the lifting motor. If necessary, the manufacturer of the motor, after-sales maintenance guarantee, service life, and special properties such as factors such as corrosion resistance.
The motor is an important driving part of the single-girder bridge crane. Generally, it adopts a wound rotor asynchronous motor and a cage-type asynchronous motor.
In the case of design limit requirements, the maximum torque or locked-rotor torque of the motor should meet the needs of the mechanism to start. In the case of meeting the design requirements, the motor should not overheat.
The working characteristics of the 10 ton single-girder bridge crane are intermittent operation, frequent starting, braking (electrical or mechanical), reverse, sometimes overload, significant vibration and shock, dusty working environment, and sometimes metal Dust, the ambient temperature varies widely.
25 ton electric motors for metallurgical bridge cranes are characterized by:
Its working system is intermittent periodic working system or intermittent periodic working system with starting, which has a large overload capacity and high mechanical strength, and the rotor moment of inertia is small, and the maximum safe speed allowed exceeds the multiple of the rated speed High, good sealing.
Therefore, the specification stipulates that the single-girder bridge crane should use a series of motors for lifting metallurgy.
10 ton single-girder bridge cranes use general industrial cage motors due to the small motor capacity required in some mechanisms. Attention should be paid to the starting torque, the multiple of the minimum torque and the maximum torque, and consideration should be given to when the motor starts, Motor terminal voltage drops, etc.
