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Motor usage precautions and solutions to minor problems

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Causes of shaft current: Asymmetrical magnetic field; Harmonics in the supply current; Poor manufacturing and installation, resulting in uneven air gap due to rotor eccentricity; Gaps between the two semicircles of the detachable stator core; Inappropriate selection of the number of laminations in the fan-shaped stator core. Harm: It erodes the surface or balls of the motor bearing, forming dotted micropores, which deteriorates the bearing's running performance, increases friction loss and heat generation, and ultimately causes the bearing to burn out. Why can't general motors be used in plateau areas? Altitude has adverse effects on motor temperature rise, motor corona (high-voltage motors), and DC motor commutation. The following three aspects should be noted: The higher the altitude, the greater the motor temperature rise and the smaller the output power. However, when the air temperature decreases with increasing altitude enough to compensate for the effect of altitude on temperature rise, the rated output power of the motor can remain unchanged; high-voltage motors should take anti-corona measures when used in plateau areas; altitude is not conducive to DC motor commutation, and attention should be paid to the selection of carbon brush materials.
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Identify the main faults of high-voltage motors

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There are many reasons for the failure of AC high-voltage motors. Therefore, it is necessary to explore a set of targeted and clear fault handling methods for various faults, propose effective preventive measures, and eliminate the faults of high-voltage motors in a timely manner, so that the failure rate of high-voltage motors decreases year by year. What are the common faults of high-voltage motors? This article will take you through the main aspects of the occurrence of faults, so as to prevent and specify effective solutions in advance.
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Daily Use and Protection of High Voltage Motors

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Timely troubleshooting of high-voltage motor faults during use can reduce the failure rate of high-voltage motors year by year. So what aspects of protection are used for high-voltage motors? Today, I will sort out several protective measures in the daily use of high-voltage motors for everyone; 1. Phase-to-phase short circuit protection, that is, current quick-break or longitudinal differential protection, reflects the phase-to-phase short circuit fault of the motor stator winding. Motors with a capacity of less than 2MW are equipped with current quick-break protection; motors with a capacity of 2MW and above or a capacity of less than 2MW but the sensitivity of the current quick-break protection cannot meet the requirements, and important motors with six outgoing lines can be equipped with longitudinal differential protection. The phase-to-phase short circuit protection of the motor acts on tripping; for synchronous motors with automatic field suppression devices, the protection should also act on field suppression.
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Causes and Maintenance Solutions for High-Voltage Motor Failures

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High-voltage motor daily use fault analysis: Due to production needs, high-voltage motors are frequently started, with large vibrations and mechanical impact, which can easily lead to failures in the motor's circulating cooling system. This mainly includes the following types: First, the external cooling pipes of the motor are damaged, leading to the loss of cooling medium, which reduces the cooling capacity of the high-voltage motor cooling system, resulting in increased motor temperature; Second, after the cooling water deteriorates, the cooling pipes are corroded and blocked by impurities, leading to motor overheating; Third, some cooling heat dissipation pipes have high requirements for heat dissipation function and thermal conductivity. Gaps are left between objects of different materials due to different degrees of shrinkage, and oxidation and corrosion occur at the joint position. If cooling water penetrates into it, it will cause a "misfire" accident in the motor, and the motor unit will automatically shut down, causing the motor unit to not work normally.
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Benefits of Replacing Energy-Saving Motor Equipment for Enterprises

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What happens if you use obsolete motors? Using motors that the state has ordered to be eliminated will not only result in fines and cessation of use, but the motors will also be confiscated, and in severe cases, it may lead to business rectification, which outweighs the gains. The Ministry of Industry and Information Technology and the State Administration for Market Regulation issued the "Motor Energy Efficiency Improvement Plan (2021-2023)", which proposed to guide enterprises to implement the renewal and upgrading of key energy-using equipment such as motors, give priority to the selection of high-efficiency energy-saving motors, and accelerate the elimination of backward and inefficient motors that do not meet the current national energy efficiency standards.
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