Electric/Hybrid Vehicle Motors

What are the causes of overheating of servo motor bearings? Motor causes: (1) the inner and outer rings of the bearing with too tight. (2) parts of the shape and position tolerance problems, such as shaft, end cover, frame and other parts of the coaxiality. (3) bearings do not fit the motor. (4) bearing lubrication or cleaning is not clean, grease contains sundries. (5) axis current effect. Reasons for use: (1) unit installation problems, such as  coaxiality of   motor shaft and  shaft of driving device does not reach the standard. (2)  pulley is pulled too tight . (3) improper maintenance of bearings, grease or not regular replacement, deterioration or dry

Insulation paint is a special kind of paint Insulating paint, also called insulating coating, is a coating with excellent electrical insulation. It has good electrochemical properties, thermal properties, mechanical properties and chemical properties. Mostly inslulating paint is varnish, also colored paint. Insulating paint is a kind of special paint. Insulating paint is an important insulating material which is based on high polymer and can be cured into insulating film or insulating whole under certain conditions. The insulating paint is composed of base material, flame retardant, curing agent, color filler, solvent and so on. Classification and application of insulating paint 1.Impregnating paint. Impregnating paint is divided into two categories: solvent paint and solvent-free paint, mainly used for impregnating the coils of motors and electrical appliances to fill their gaps and micro-holes, and after curing, it can form a continuous flat film on the surface of the impreg

Motor vibration reasons and typical cases Vibration of the motor will shorten the insulation and bearing life of the winding, affect the normal lubrication of the sliding bearing, and the vibration force will promote the expansion of the insulation gap, so that the external dust and moisture can intrude, resulting in lower insulation resistance and increased leakage current, or even the formation of insulation breakdown and other accidents. In addition, vibration of the motor easily make the cooling water pipe cracked, the welding points cracked, at the same time can cause loaded machine damaged, reduce the precision of workpiece, can cause all the vibrating mechanical parts fatigue, can make the anchor bolt is loose or broken, motor and can lead to abnormal wear of carbon brush and slip ring, can appear even serious brush fire and burned collector ring, insulation motor will make a big noise, this kind of situation usually also have occurred in the dc motor. There are three m

1. Imbalance of rotor, coupler, coupling and transmission wheel (brake wheel). 2. Loose core support, loose oblique key and pin failure, and loose rotor binding will cause imbalance of the rotating part. 3. The axis of the linkage part is out of center, the center line does not coincide, and the centering is not correct. The main cause of this kind of failure is the installation process, poor and improper installation. 4. The center line of the linkage part overlaps and is consistent in the cold state, but after running for a period of time, the center line is damaged due to the deformation of the rotor fulcrum and foundation, resulting in vibration. 5. The gear and coupling connected with the motor are out of order, with poor occlusion of the gear, severe wear of the gear teeth, poor lubrication of the opposite wheel, misalignment of the coupling, wrong tooth shape and tooth spacing, excessive clearance or severe wear, all of which will cause certain vibration. 6.

In general, the stator of the motor is on the outside and the rotor is on the inside. In a conventional brush dc motor, the stator field is on the outside and the rotor armature is on the inside. Brushless dc motor appeared, so that the rotating armature from the inside to the outside, from the rotor into a stator; And the original stationary stator permanent magnet went inside, and from the stator become the rotor. This kind of structure is called an "internal rotor structure". In practical use, sometimes in order to meet the special technical requirements of some electromechanical, the motor stator armature is made inside, and the rotor with permanent magnet is made outside. We call this structure "external rotor structure", or "internal stator structure". In the design of brushless dc motor, the external rotor structure and the internal rotor structure have their own advantages and disadvantages. The differences in motor characteristics between the

The causes of shaft voltage and shaft current 1. Magnetic imbalance generates shaft voltage When the ac asynchronous motor operates at sinusoidal alternating voltage, its rotor is in the sinusoidal alternating magnetic field. The unbalanced magnetic field in the magnetic circuit is caused by the fan-shaped impingement of the stator rotor of the motor, the lamination of the silicon steel sheet, the existence of the iron core slot and the vents, etc. When the magnetic field in the peripheral direction of the stator core of the motor is unbalanced, the alternating flux of the intersecting chain with the shaft will be generated, thus generating the alternating potential. When the motor rotates, namely the magnetic pole rotates, the magnetic flux of each magnetic pole changes, and the shaft voltage is induced at both ends of the shaft, resulting in the magnetic flux intersecting with the shaft. As the magnetic pole rotates, the flux of the intersecting chain with the shaft changes