MDD090C-N-030-N​2M-110GB0
轴封轴封连接到输出轴上。它确保没有液体沿着轴渗入电机壳体。对于可能存在污垢或水射流影响的应用场合，需要带轴封的输出轴。这种情况下的防护等级为IP 65。从MDD 065系列起，输出轴标准配备轴封。MDD 021的输出轴仅在没有轴密封的情况下可用。这种情况下的防护等级为IP 50。这意味着这种电机类型不适用于污垢或水射流是一个因素的任何应用。MDD 025和MDD 041提供带或不带轴密封的设计选项。允许轴载荷一旦径向力或轴向力影响电机轴，就向轴施加载荷。允许的径向力（径向轴载荷）如“轴载荷能力”一节（第3.3、4.3节等）中的图表所示。允许的径向力取决于•平均速度和•施力点。可借助本节中的公式计算容许轴向力（轴向轴载荷）。负载下的热变形冷却，例如，在重复频率较高的连续启动-停止操作的情况下，可以在一些电机上安装表面冷却装置。鼓风机电机可在1 x AC 230 V和AC 115 V电源电压下运行。长度上的热变形会影响电机的A侧。这意味着电机轴端的A侧可以相对于电机壳体多移动0.6 mm。因此，通过使用螺旋齿安装在电机输出轴上但未轴向固定在机器上的驱动小齿轮，会发生位置移动，或者通过使用螺旋齿轴向固定在机器上的驱动小齿轮和伞齿轮小齿轮，会产生热应力。后者可能导致电机B侧轴承损坏。

Shaft sealing The shaft sealing is attached to the output shaft. It ensures that no liquids can penetrate into the motor housing along the shaft. An output shaft with shaft sealing is required for those applications where dirt or the affects of a jet of water can be present. The protetion category in this case is IP 65. From motor series MDD 065 upwards, the output shafts are standardly equipped with a shaft sealing. The output shaft of the MDD 021 is only available without a shaft sealing. The protection category in this case is IP 50. This means that this motor type is not suited for any applications where dirt or a jet of water are a factor. The MDD 025 and MDD 041 offer the option of a design with or without a shaft sealing. Permissible shaft load A load is being applied to the shaft as soon as radial or axial forces affect the motor shaft. The permissible radial force (radial shaft load) is depicted in a diagram in section "Shaft Load Capacity" (Section 3.3., 4.3 and so on). The permissible radial force depends on • the average speed and • the point of application of force. The permissible axial force (axial shaft load) can be calculated with the aid of a formula, which can be found in this section. Thermal Deformations Cooling For extreme loads, as it is, for example, the case with continuous start-stop operations with a high level of repetitive frequency, it is possible to mount a surface-cooling unit to some of the motors. Blower motors operating with 1 x AC 230 V and AC 115 V from the supply voltage are available. Thermal deformations in length affect side A of the motor. This means that the A side of the motor shaft end can shift up to 0.6 mm with respect to the motor housing. As a result, there is • a shifting of position by using drive pinions with helical teeth mounted to the motor output shaft but not axially fixed to the machine or • occuring thermal stress by using drive pinions with helical teeth axially fixed to the machine and with bevel gear pinions. The latter can lead to damage on the bearing of side B of the motor.