铁芯压装的任务，将一定数量的冲片理齐、压紧、固定成一个尺寸精确、外形整齐、紧密适宜的整体，铁芯压装后应符合下列技术要求

The core pressing task, will rush to a certain number of schistosity Qi, pressed and fixed into a whole a precise size, neat appearance, tight fit, core is pressed after should meet the following technical requirements

1.  铁芯重量符合图纸要求，其偏差一般应不大于+3%~-1%

1. the core weight meets the requirements of the drawings, the deviation should not be greater than +3%~-1%

铁芯重量不足将使磁感应强度增高，导致电机铁耗增加，励磁电流增大，功率因数和效率降低

If the core weight is not enough, the magnetic induction will be increased, which will lead to the increase of the iron consumption, the increase of the excitation current, the decrease of the power factor and efficiency

2.  压力均匀和紧密度适宜

2. pressure uniformity and tightness appropriate

铁芯在机械振动、电磁和热力综合作用下，不应出现松动和变形。对于外压装铁芯，还要保证在运输中不致松动和变形。铁芯过松，则一定长度内冲片数量少，不仅导磁截面不足，而且引起振动噪音，损坏绝缘；如果压的过紧，使片间绝缘电阻降低，甚至损坏绝缘，将使铁耗剧增。压力不均，过紧外绝缘易损坏，过松处往往造成铁芯松动。

Iron core should not be loosened and deformed under the combined action of mechanical vibration, electromagnetic and thermal. For the external pressure installed iron core, but also to ensure that the transport will not loose and deformation. The core is too loose, within a certain length of punching small number, not only magnetic section insufficient, but also cause vibration and noise, insulation damage; if the pressure tight, the patch insulation resistance is reduced, or even damage the insulation, will make iron consumption increase. Uneven pressure, too tight external insulation is easy to damage, loose place often cause iron core loose.

3.  几何尺寸准确

3. geometric accuracy

铁芯总长度、槽形尺寸及径向通风槽的尺寸和位置等均应符合规定要求。铁芯叠装后难免参差不齐，槽孔尺寸总比冲片尺寸要小些，这个误差越小越好。因为电机的磁路计算是根据冲片的几何尺寸，而线圈尺寸则须按铁芯槽的透光尺寸计算。一般允许压装后槽形尺寸比冲片尺寸小0.2mm，由扇形片叠压的大型电机，一般可小0.4~0.5。

The total length of the iron core, the size of the groove and the size and position of the radial ventilation slot should be in accordance with the requirements. After stacking, the core is hard to be uneven, and the slot size is smaller than the punching piece size. The smaller the error, the better. Because the calculation of the magnetic circuit of the motor is based on the geometric size of the punching piece, the coil size must be calculated according to the light transmission dimension of the iron core groove. Generally speaking, the groove size is smaller than the punching piece size 0.2mm, and the large motor with fan-shaped lamination is generally small 0.4~0.5.

小型异步电机铁芯外径公差，与保证外压装定子铁芯同轴度的工艺有关。中型异步电机铁芯，定子内径、转子外径以及直流电机电枢铁芯外径公差，一般采用h7。

The tolerance of iron core outer diameter of small asynchronous motor is related to the process of ensuring the coaxiality of the stator core installed with external pressure. The size of the stator core, the inner diameter of the stator, the outer diameter of the rotor and the outer diameter of the armature core of the DC motor are generally used as h7.

对于内压装定子铁芯，主要是在压装过程中保证机座止口和铁芯内圆的同轴度，压装后，以止口定位，磨或车削铁芯内圆，虽可提高同轴度，但将增大铁损耗，影响电机性能。

For pressing stator core, mainly in the pressing process to ensure a rabbet and core inner circle of coaxial, pressing, to stop positioning, grinding or turning round the core, can improve the concentricity, but will increase the iron loss, affect the motor performance.