The Selection of Crane Hoisting Motor Mechanism|Dongqi Group

In the process of lifting, the motor always in a power-up, outage, start, brake and reverse state in order to meet the operating characteristics of the crane, and it is subject to the load at all stages are different. In view of this, the lifting motor must have a strong overload capacity, which is sufficient to withstand greater overload and mechanical shock.

Cutting resistance control

Cut the resistance control mode when the motor is generally used winding motor.

• A. The general hoisting mechanism motor, when calculating the steady state power, according to the corresponding work level of the corresponding work select the motor; that is, the working level M3, the motor by S3, then the power rate JC15% work system selection; When the operating level M4 or M5, the motor according to S3, then the power transfer rate JC25% work system selection; when the organization working level M6, the motor by S3, then the power rate JC40% work system selection; when the working level M7 or M8 , The motor according to S3, then the power transfer rate JC60% work system selection. For agencies with low operating levels, special attention should be paid to the overload capacity of the motor.
• B. For a four-rope grab crane with open-close mechanism and lifting mechanism, the motor of each mechanism takes 66% of the total power; when the system ensures that the wires of the two sets of mechanisms are exactly the same, the motor of each mechanism Power is 55% of total power.
• C. For a hoisting mechanism with two sets of the same drive means (such as electromagnetic chucks, clamps, swivel beams, etc.), the power of each motor is not less than 60% of the total power; Press the double motor for overload check and heat check (heat check for each motor to bear 50% of the load).
• D for the large tonnage to take two sets of drive device lifting mechanism, the power of each motor is not less than 55% of the total power; and should be double motor overload check and heat check (heat test for each motor bear 50% Load).

Stator voltage regulation control

Stator voltage regulation and control system is generally used winding motor.

• A. The hoisting mechanism shall calculate the steady-state power and multiply the magnification factor of 1.1 to 1.15 to select the motor; then select the motor corresponding to the working system according to the corresponding working level of the mechanism; that is, the motor working level M3 Press the S3, then the power transfer rate JC15% work system selection; when the organization working level M4 or M5, the motor by S3, then the power rate JC25% work system selection; when the organization working level M6, the motor by S3, Rate JC40% of the work system selection; when the organization working level M7 or M8, the motor by S3, then the power transfer rate JC60% work system selection. For agencies with low operating levels, special attention should be paid to the overload capacity of the motor.
• B. For a four-rope grab crane with open-close mechanism and lifting mechanism, the motor of each mechanism takes 66% of the total power; when the system ensures that the wires of the two sets of mechanisms are exactly the same, the motor of each mechanism Power is 55% of total power.
• C. For a casting crane with two sets of the same hoisting mechanism, the motor power is selected at 66% of the total power when using a conventional structural form; and the rated load is lifted by a single motor (note that the single motor is required to drive another A set of drive parts of the part of the rotation, so the efficiency of the mechanism at this time has been reduced) and double motor lifting 1.25 times the static load of the two kinds of state overload check; and the need for double motor heat check (heat check every The motor is subjected to a 50% load). For the use of planetary differential reducer dual motor drive, the motor power is not less than 50% of the total power, and the need for motor overload check and heat checking; general inspection requirements with the use of ordinary structural form of the motor. For the use of planetary differential reducer dual motor driven hoisting mechanism, when the user has a single motor need to work for a period of time required lifting motor, but also increase the single motor heat check (Note: single motor work when the lifting speed)
• D. For a hoisting mechanism with two sets of the same drive, such as electromagnetic chucks, clamps, swivel beams, etc., the power of each motor is not less than 60% of the total power; Dual motor overload check and heat check (heat check for each motor to withstand 50% of the load).
• E for the large tonnage to take two sets of drive device lifting mechanism, the power of each motor is not less than 55% of the total power; and should be double motor overload check and heat check (heat test for each motor bear 50% Load).

Frequency control

Frequency control is generally used in variable frequency motor and squirrel cage motor, according to user requirements are also used winding motor.

• A. Variable speed speed control of the lifting motor, when the steady state power is calculated, the corresponding working level should be selected according to the corresponding working system of the motor. When the working level of the machine is below M5 (including M5), the motor is selected according to the working system S3 and the connection rate JC 25%. When the working level is M6, the motor is connected according to S3 and JC40% ; When the machine working level M7 or M8, the motor according to S3, then the power transfer rate JC60% work system selection. For agencies with low operating levels, special attention should be paid to the overload capacity of the motor.
• B. Variable speed speed control of the lifting motor should be "low frequency torque should be greater than the steady rise of rated load torque 1.4 times" check. For the work of low-level hoisting motor If the above check can not pass, you can use the appropriate way to solve the low frequency of the low torque when the problem (when using the way up the work, should pay attention to combine the maximum allowable speed reducer And the actual situation of the company to control the maximum operating frequency).
• C For a four-rope grab crane with an opening and closing mechanism and a lifting mechanism, the motor of each mechanism takes 66% of the total power (due to the motor characteristics of the frequency conversion control mode, when the control system does not take certain measures, Two motors are more difficult to coordinate the work, generally do not recommend this frequency control mode); when the system can ensure that the two sets of institutions of the wire rope can be completely consistent, the body motor power each take 55% of the total power.
• D. Casting cranes with two sets of same hoisting mechanisms, each of which is selected by 66% of the total power if a lifting mechanism is used in the conventional structure. In order to meet the requirements of a single motor to complete a working cycle, The appropriate way to uplift (at this time should be electrical contact, requiring electronic control design, consider the single motor operation only allows the frequency below the work); when the mechanism to work up the way, should pay attention to the maximum speed according to reducer and The actual situation of the company, to control the maximum operating frequency, and in the instructions to be explained. And then press the single motor to lift the rated load.(Note: because the single motor work, need to drive another part of the drive device parts rotation, so the efficiency of the mechanism at this time has been reduced, and check the frequency of the frequency) Overload check; according to pay 1.25 times the static load for double motor overload check; Finally, should also be double motor heat check (heat calculation according to each motor bear 50% load). For the use of planetary differential reducer dual motor drive, each motor power is not less than 50% of the total power, and according to the requirements of the motor overload check and heat checking; general inspection requirements with the general structure of the motor. For the use of planetary differential reducer dual motor driven hoisting mechanism, when the user has a single motor need to work for a period of time required lifting motor, but also increase the single motor heat check (Note: single motor work when the lifting speed)
• E. For a hoisting mechanism with two sets of the same drive, such as electromagnetic chucks, clamps, swivel beams, etc., the power of each motor is not less than 55% of the total power; Press the double motor for overload check and heat check (heat check for each motor to bear 50% of the load).
• F. For the large tonnage to take two sets of drive device lifting mechanism, the power of each motor is not less than 50% of the total power; for the work of the relatively low lifting mechanism, such as the work level below M5 (including M5) The ratio of the power of each selected motor to the total power shall be increased and the overload check and heat check shall be carried out on a double motor (the heat test shall be 50% of the load per motor).

Dongqi Group can provide you overhead crane, gantry crane, jib crane, Electric Winch, electric hoist and crane spare parts, if you have need please contact us freely.