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Motor common problems and solutions

March 26, 2024
1. When the ambient temperature exceeds 40 ° C, the choice of motor can be taken to solve two ways: First, the use of insulation class H-class motor, H-class motor for the temperature does not exceed 60 ° C environment; Second, the use of insulation Grade F-class motor, through the discharge to achieve; specific methods see the standard page 97; priority to use the first method.


2. When the crane is working at an altitude of 1000m or more, the motor should be discharged. For details, see page 97.


3. Outdoor work of the crane, should use the protection class IP54 motor.


4. The bridge crane is not continuous long-term work, do not need to select the S1 working system or power transmission rate JC100% of the motor. The crane motor should be selected according to the working level of the corresponding work system and the corresponding electrical continuity of the motor (for different control methods, the specific choice is also different). When the parameters of the S1 operating system are provided in the motor sample only, the conversion factor shall be converted according to the conversion factor provided by the motor supplier. For the supplier not providing the conversion factor, it can be described in the interpretation of the crane design specification and on page 208 Method to convert.


5. For crankshaft motors that require continuous operation for more than 10 minutes, the S2 operating system should be used. S2 work system for 30 minutes and 60 minutes of two kinds of work system, the specific choice of 30 minutes or 60 minutes working system of the motor, according to the actual operation of the time to determine. Loading and unloading bridge hoisting mechanism of the motor should be selected according to S4 work system motor.


6. Frequency conversion motor samples generally do not provide S2, S4 and S5 work system of the relevant parameters, according to the corresponding YZR power value of the motor operating power of the corresponding calculation to check.


7. In general, conditions permit, as far as possible the use of a small number of motor.


8. After the primary motor, the motor should be checked for overload and heat check.


9. The use of stator voltage control, frequency control system or other information needs feedback and other special requirements, the need for mechanical design and installation of components, in the design should be related to the electrical contact.


10. When the user has a special provisions of the motor, should be selected according to user requirements.


11 .The choice of motor should be adjusted according to the actual situation, so that the selected motor is economical and reliable, to achieve a relatively ideal effect


12. 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 check; check the requirements with the general structure of the motor for the use of planetary differential deceleration The dual motor-driven hoisting mechanism, when the user has a single motor requires a period of time required to lift the motor, but also increase the single motor heat check (note: single motor work when the lifting speed).

Henan Kosta Machinery Equipment Co., Ltd.



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