Synchronmotoren 8LVA

Doppel-Winkeleinbaudose

Einkabellösung (hybrid)

The 8LV servo motor series is available in three different sizes (1, 2, 3). They have different dimensions (especially flange dimensions) and power ratings. The various sizes can be differentiated by a number (c) in the model number. The larger the number, the larger the flange dimensions and power rating for the respective motor.

The 8LV servo motor series is available in two different lengths. They have different power ratings with identical flange dimensions. The various lengths can be differentiated by a number (d) in the model number.

8LV servo motors are equipped with grooved ball bearings which are sealed on both sides and greased. Radial and axial forces (F_r, F_a) applied to the shaft end during operation and installation must be within the specifications listed below. Bearing elements may not be subjected to shocks or impacts! Incorrect handling will reduce the service life and result in damage to the bearings.

Installation

The axial forces F_a permitted during the installation of pinion gears, couplings, etc. depend on the motor size and can be found in the following table:

Radial force

The radial force F_r on the shaft end is a function of the loads during installation (e.g. belt tension on pulleys) and operation (e.g. load torque on the pinion). The maximum radial force F_r depends on the shaft end type, bearing type, average speed, the position where the radial force is applied and the desired service life of the bearings.

Axial force, shift in shaft position caused by axial force

The axial force F_a on the shaft end is a function of the loads during installation (e.g. stress caused by mounting) and operation (e.g. thrust caused by slanted tooth pinions). The maximum axial force F_a depends on the bearing type and the desired service life of the bearings. The fixed bearing is secured on the A flange (with size 1 the fixed bearing is on the B side flange and the floating bearing is on the A side 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. As a result, no axial force is permitted in the direction of the B flange when using these motors.

The shaft ends of motors with holding brakes are not permitted to have axial loads applied. It is especially important to prevent axial forces in the direction of the B flange since these forces can cause the brake to fail!

Determining permissible values for F_r and F_a

Information for determining permissible values of F_r and F_a can be found in the motor data for the respective servo motor. Permissible values are based on a bearing service life of 20,000 h (bearing service life calculation based on DIN ISO 281).