(1) the power supply voltage is too high;(2) the power supply voltage is too low;(3) the voltage unbalance;(4) the three-phase unbalanced power.

(1) the electrical environment temperature is too high, the air inlet temperature is high;(2) into the air with debris blocked, so that the poor into the wind, causing air flow into the small;(3) the internal dust motor too much, the impact of heat;(4) fan is damaged or is reversed, resulting in no wind or small air volume;(5) not installed wind cover or the motor end cover not installed wind deflector, resulting in motor without wind path of;(6) enclosed motor fin defect too, radiating area dec

(1) the motor winding open circuit, resulting in unbalanced three-phase current, the motor overheating;(2) the motor winding short circuit, short circuit current is much larger than the normal operating current, the winding copper loss increase, leading to overheating winding, even burning;(3) the motor connection errors, when a delta connected motor wrongly into the star shaped, motor still with full load, the stator winding current flowing to exceed the rated current, eventually lead to motor

According to the use of the site, flameproof motor is divided into three categories, namely, class I, class II and class III. (1) I used in coal mine, which YBK2 series applies to the coal mine (mining work face) of explosive gas mixture consisting mainly of methane or coal dust in the place of the equipment; YB2 series I type, suitable for coal mine (non mining work face). (2) class II for inflammable and explosive gas and dust factories and other similar occasions. II type flameproof motor a

(1) asynchronous motor overload, long-term, fixed rotor rub (sweeping).(2) winding insulation, the insulation performance is reduced, leading to the ground (commonly known as touch shell) fault.(3) in the replacement of stator winding insulation, slot without pad or damage.(4) the end winding is too long and the end cover together

Choose what kind of groove, depends on the specific situation... Efficient, the stator slot dumpy, in order to reduce leakage, improve operational efficiency, rotor slot is as large as possible, but since the start of the restrictions, but also have to choose the knife shaped, convex shaped groove, to start the current limit of rapidly rising... Frequency conversion, with large slot, supports the maximum torque, does not take into account the starting performance, rotor slot selection smooth s

(1) increase the exciting force wave (wave number of pole pairs).Increasing the radial force produced by the harmonic magnetic field wavenumber, mainly rely on the reasonable selection of the rotor slot set.(2) the natural vibration frequency stagger frequency of excitation forceand motor structure is important, so to determine the natural frequency of the stator structure, the rotor system and the end cover, and thenatural frequency and main vibration frequency were compared.(3) increase the st

1 double winding: core double winding winding mode as shown in. (Note: thecalculation results)1. The length of the edge (mm): L=LFe+2L1Type: L -- length of core linear part, mm;LFe -- the length of the stator core, mm;L1 -- coil linear portion extending core side length, mm; for the motor center height of 160mm and below, 15mm; center height of 180 ～ 225mm, is 20mm; motor center high above 250mm, 25mm.PI (Di1+h+r1)⑵. Width: By= -- -- -- y (mm)Z1Type: winding Y -- to slot number distance;Di1, h

Rolling bearing frame is composed of an outer ring, inner ring, generally keep rolling body and. The inner ring and the shaft neck is the basic hole system (basic deviation of a hole tolerance zone, with different basic deviation tolerance zone of the shaft to form a system of various matching), outer ring and bearing chamber hole Weiji shaft system (basic deviation of a certain tolerance zone of the shaft, the hole with different basic deviations the tolerance zone formed a kind of system with

(1) the end of rolling bearing with designation shall be mounted in the visible direction, so that the replacement check.(2) bearings mounted on a shaft or a bearing chamber, askewphenomenon is not allowed.(3) two bearing coaxial, must have a bearing with axial moving scope in the axial thermal expansion.(4) when the bearing is assembled, the pressure (or impact) should bedirectly added to the ferrule end face to be matched, not allowed to pass through the rolling pressure.(5) should be kept cle