跳至主要内容

one kind of typical permanent magnet motor（PMSM）

EV/HEV driving motor supplier , LEGO, China
yulongzhu@lego-motors.com

评论

发表评论

此博客中的热门博文

Advantages and disadvantages of rare earth permanent magnet synchronous motor compared with squirrel-cage asynchronous motor

A ：high efficiency and energy saving 1) no slip error, no fundamental wave loss of iron and copper on the rotor; 2) the rotor permanent magnet is used for excitation, and the power factor can reach 1, saving the reactive power. On the other hand, the stator current decreases, the stator copper loss decreases, and the efficiency increases. 3) the polar arc coefficient is generally greater than the polar arc coefficient of the asynchronous motor. When the power supply voltage and the stator structure are fixed, the average magnetic density is smaller than the asynchronous motor and the iron loss is smaller. 4) stray loss of rare earth permanent magnet synchronous motor: it is generally believed that the non-sinusoidal magnetic field of the permanent magnet increases the stray loss, but on the other hand, the large air gap of the rare earth permanent magnet synchronous motor reduces the stray loss. B ：small size, light weight, high power density 1) analysis from the persp...
发表评论
阅读全文

The general tests of electric motors：1

The comprehensive inspection and maintenance of the motor not only includes the routine motor cleaning, the measurement of tolerance , the replacement of bearings, the inspection of leads, but also includes some test items. Below I make a simple summary of the general test items of the motor. The inspection test items of three-phase asynchronous motor include: insulation resistance measurement, winding dc resistance measurement, voltage withstand test and no-load test, etc. 1. Measurement of insulation resistance: Measuring the insulation resistance between each phase winding and each phase winding on the housing is the most convenient and non-destructive inspection of insulation.Though these inspection, it detect whether the winding insulation is seriously affected by moisture or has serious defects. The following defects can also be found effectively: the overall insulation quality is poor; Insulation become damp; There are penetrating conductive channels between the...
发表评论
阅读全文

Motor vibration reasons and typical cases

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...
发表评论
阅读全文