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8LSN synchronous motors

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Motors with increased mass moment of inertia

8LSN three-phase synchronous motors have been specially developed for use in applications where a high mass moment of inertia is required, and they impressively round off the B&R motion control product range without compromises regarding size and positioning precision.


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8LSN three-phase synchronous motors

B&R's 8LSN three-phase synchronous motors have been specially developed for use in applications where a high mass moment of inertia is required. They are now being used to produce consumer goods and products in the plastic, packaging, metal, food and beverage industries and then palletize them with material handling systems. To have a complete solution from a single source, not only do you need the right components, you need them tailored to the application at hand. The broad selection of 8LSN high-inertia, three-phase synchronous motors makes it easy to satisfy fundamental requirements such as streamlined parts inventory, easy service and minimized footprint.

An optimum selection of power transmission technology is the perfect way to round off a successful machine design. To help you get there, B&R's specialists at offices all around the world are there to share their expertise in the area of mechatronics. B&R automation components: where mechanics, electronics, technology and innovation converge with optimum efficiency.

Advantages of B&R servo motors for your application:

  • Compact sizes result in low weight and optimal power density
  • Easier construction
  • High inertia
  • Fast axes thanks to impressive dynamic properties
  • Universal application thanks to overload capability
  • Good controllability thanks to optimized torque rippling
  • Extremely easy to service
  • Low costs

Smooth surface

The special surface design of the 8LSN three-phase synchronous motors allows them to be used in food and beverage applications. Depressions where liquid can collect were deliberately avoided.

Connection type

The uniform connection technology, the pre-assembled cables and the embedded parameter chip allow "plug and play" operation of the power transmission system. The angled connectors can be swiveled, which provides the maximum amount of flexibility during cabling.

Embedded parameter chip

All relevant mechanical and electrical information and data is stored in the EnDat encoder used for 8LSN three-phase synchronous motors. This means that the user doesn't have to configure settings on the servo drive in the field. As soon as the encoder is connected to the servo drive and the power is applied to the electronics, the motor is automatically identified. The motor sends its nominal parameters and limit parameters to the servo drive. The drive then automatically determines the current limits and current control parameters required for optimal control of the motor. The only things that the user has to optimize are the speed and position controllers. The integrated commissioning environment in B&R Automation StudioTM provides all necessary support.

In addition to assistance during commissioning, routine service work is also simplified, and motors can be exchanged without having to take extra time to set parameters.

Cooling / Construction type

8LSN three-phase synchronous motors are self-cooling and have a long, slim design. The motors must be installed on the cooling surface (flange).


8LSN three-phase synchronous motors are available in two different sizes (4, 5). They have different dimensions (especially flange dimensions) and power ratings. These different sizes are indicated by a number represented by (c) in the model number. The larger the number, the larger the flange dimensions and power rating for the respective motor.

  • Cooling type
    Available sizes

8LT three-phase synchronous motors are available in up to 5 different lengths. They have different power ratings with identical flange dimensions. These different lengths are indicated by a number represented by (d) in the model number.

  • Length
    Available sizes
Feedback systems specified to meet your needs

8LSN three-phase synchronous motors are available with a selection of encoder systems. As standard, they come equipped with Heidenhain EnDat encoders. Depending on the needs of the application, customers can select between normal and high-resolution encoders. Both types are also available as multi-turn encoders. They allow operation without requiring homing procedures or additional measurement systems on the workpiece. The absolute encoder functions without a battery and is therefore absolutely maintenance-free. For machines with lower precision and speed requirements, the 8LSN three-phase synchronous motors are also available with resolvers.

Load capacity of the shaft end and bearings

8LSN three-phase synchronous motors are equipped with grooved ball bearings that are sealed on both sides and lubricated.Bearing elements must not be subjected to shocks or impacts! Incorrect handling will reduce the service life and result in damage to the bearings.

Motor options

8LSN three-phase synchronous motors are available

  • With various nominal speeds
  • With or without an oil seal
  • With or without a holding brake
  • With a smooth or keyed shaft
  • With two different connection directions

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The nominal speed is listed as part of the model number in the form of a 3-digit code (nnn). This code represents the nominal speed divided by 100. The respective combination of other motor options is listed as part of the model number in the form of a 2-digit code (ff).

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