1 Motor protection types and applications Commonly used in small and medium-sized three-phase asynchronous motor overheating protection and temperature measurement devices can be broadly divided into two categories: one is the setting temperature sensing element, such as thermistor and thermal switch; other thermocouples and platinum thermal resistance. There is also a tropical moisture plus, used to protect the motor running in a damp environment. These temperature sensing element is embedded

Aluminum motor with cast aluminum housing to replace the traditional cast iron housing motor. It has a beautiful appearance, small size, light weight, simple structure, easy maintenance, the production process more environmentally friendly, high efficiency, easy to transport, etc., the majority of users. But aluminum processing requirements, the chassis, the end cap concentricity, and aluminum non-conducting magnetic field, the magnetic circuit of the motor yoke relative than ironclad motor satu

High voltage level of the high-voltage motors, usually 6KV and 10KV motor main power wiring inside the junction box cable insulation is very important, motor connection cable is divided into two parts, part of the motor stator outlet cable, another part of the motor is running power supply cable. The national standard GB14711-2006 Safety requirements of small and medium-sized rotary motor provides: a rated voltage of the the 6KV motor, the different live parts of the terminal box minimum clearan

（1）Motor winding open circuit When the motor windings in one phase winding circuit, or parallel branch circuit, when there is a slip road, will result in three-phase current imbalance, so that motor overheating. （2）Motor winding short-circuit When the motor winding short-circuit fault occurs, the short-circuit current is much larger than the normal work, so that winding copper loss increases, resulting in winding overheating, or even burned. （3）Motor Connection Error When the triangle

A Y series three-phase asynchronous electric starter can be empty, but the current increase sample sizes and three-phase current, motor vibration, noise, heat quickly, significantly reduced starting torque. If the load can not start, connect a power supply, blown fuse immediately. Failure Analysis:Based on the above phenomenon for the stator windings can be found there were serious short-circuit fault. Common short-circuit fault conditions are: the same with the coil winding inter-turn short c

1. A symbol of protection levels is by the characterization of the letters IP and additional representation in the latter two numbers Which the IP is the English international protection (International Protection) of the acronym.The first digitalSpecific meaningBrief0No special protectionNo protective motor1To prevent accidental or accidental human touch on or near the shell of charged or rotating parts, diameter greater than 50mm to prevent the entry of foreign matter into the solid motorSolid

A Y225M-6-30KW, 380V, 59A motors, and some time after the normal start-up, but with half an hour after the load operation, the motor will be overheated, do not smoke, no Charred smell, and a basic balance between supply voltage, and stator winding current imbalance is obvious, namely 80A, 47A and 46A. This is a used motor, in the past has been running normal, indicating that error-free wiring. Three-phase voltage and the basic balance, then the three-phase current imbalance caused by the reason

High-voltage motors’ voltage level is usually as high as 6kv or 10kv, so the insulation of the cable in the junction box of the motor’s main power is very important. The motor’s connection cable is divided into two parts, one is the outlet cable of the motor’s stator and the other part is the power supplying cable while the motor is running. As provided in the national standard GB14711-2006 “ Security requirements of small and medium-sized rotary motors”, for the motor with 6kv rated volta

piece of Y160L-4-15KW three-phase asynchronous motor, triangle connected, it can start in the past time, and now can not start with a strong noise. If be rolled, it can run along the external force, but quickly overheated. Analysis:as it can run along the external force, we know that the motor lack phase.When triangle connection motor lack phase, the off-phase winding into currentcircuit. in the same voltage, the current is same. so the motor will not start. At this time, not off phase winding c

Three-phase asynchronous motor should not the normal operation of the fault analysis steps Units 1 Y160L-4-15KW three-phase asynchronous motor, should not the normal operation of the steps at the time of failure analysis. When a motor can not be normal operation, it is necessary to fix it, we must follow the steps must check,that is, in a systematic to do some tests, find out the root cause of failure.After these tests, repair personnel will be able to determine whether this motor is only requir