MOTOROLA MVME187-034B Power module

The axial force Fa on the shaft end is made up of the installation forces (e.g. stress caused by installation) and operational forces (e.g. thrust caused by slanted tooth pinions). The maximum axial force Fa depends on the bearing type and the desired lifespan of the bearings. The fixed bearing is secured on the A flange with a retaining ring. The floating bearing is preloaded on the B flange with a spring in the direction of the A flange. Axial forces in the direction of the B flange can cause the spring bias to be overcome and the shaft is shifted by the amount of axial play in the bearing (approx. 0.1 - 0.2 mm). This shift can cause problems on motors with holding brakes or motors with EnDat encoders (E2 and E3). Therefore, no axial force is permitted in the direction of the B flange when using these motors.

Determining Permissible Values for Fr and Fa 

Information to determine permissible values of Fr and Fa can be taken from the motor data for the respective three-phase synchronous motors (see section 1.9 "Motor Data 8LSA2" to section 1.15 "Motor Data 8LSA8"). Permissible values are based on a bearing lifespan of 20000 h (bearing lifespan calculation based on DIN ISO 281). 1.3.6 Connection Direction 8LS three-phase synchronous motors can be delivered with "top" connection direction and also with axial swivel connectors.

                                                                        

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