Why is the current motor easier to burn now than before?
Why is the current motor easier to burn now than before? Dalan oil pump motor manufacturers analyze for you from the following aspects:
1. The current motor is more susceptible to damage than in the past.
1 Due to the continuous development of insulation technology, in the design of the motor, it is required to increase the output and reduce the volume, so that the heat capacity of the new motor is getting smaller and smaller, and the overload capacity is getting weaker;
2 Due to the improvement of production automation, the motor is often required to run frequently in various ways such as frequent starting, braking, forward and reverse rotation, and variable load, which puts higher requirements on the motor protection device.
3 The application of the motor is wider and often works in extremely harsh environments, such as humidity, high temperature, dust, corrosion and other occasions.
4 plus the irregularity of the motor repair, the omission of equipment management.
2, the traditional protection device protection effect is not ideal
1 The traditional motor protection device is mainly composed of fuses and thermal relays.
2 fuses are the earliest and simplest protection devices. In fact, the fuse is mainly used for short-circuit faults, protects the power supply line, and reduces the expansion of the fault range.
3 It is unscientific to think that the fuse can protect the motor from short-circuit or overload. It is not scientific to select the fuse according to the starting current of the motor. I don't know, this is more likely to cause the motor to damage the motor due to phase failure.
4 Thermal relays are the most widely used motor overload protection devices. However, the thermal relay has a single function, low sensitivity, large error, and poor stability, all of which cause unreliable motor protection. Although many devices have thermal relays installed, the damage to the motor that affects normal production is still common.
3, the principle of protector selection
1 The purpose of selecting the motor protection device is to enable the motor to fully exert the overload capability and avoid damage, and also improve the reliability and continuity of the electric drive system.
2 When selecting a protection device at the same time, several contradictory factors must be considered, namely reliability, economy, simple structure, convenient operation and maintenance.
3 Consider the simplest protection device when it can meet the protection requirements. Only when the simple protection device can not meet the requirements or put forward higher requirements for the protection characteristics, consider the application of complex protection devices.
4, the ideal motor protector
1 The ideal motor protector is not the most functional, nor the most advanced, but should be the most practical.
2 Reliable should firstly meet the reliability of the function. For example, the overcurrent and phase failure functions must be reliable for overcurrent and phase failure in various occasions, various processes and various modes.
3 Secondly, its own reliability (since the protector is to protect others, especially high reliability) must have adaptability and durability to various harsh environments.
4 Economical: Adopt advanced design, reasonable structure, professional and large-scale production, reduce product cost, and bring high economic benefits to users.
5 Convenience: It must be at least similar to the thermal relay in terms of installation, use, adjustment, wiring, etc., as simple and convenient as possible.
----- Editor-in-Chief: Dalan Oil Pump Motor 02-Procurement Consultant
Copyright http: / (Dalan Motor) Reprint, please indicate the source
Http://news.chinawj.com.cn Editor: (Hardware Business Network Information Center) http://news.chinawj.com.cn
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