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8LS synchronous motors

catalog title page - 8ls approved

Dynamic precision motors

Modern machine concepts require mechatronic solutions. The AC servo motor series from B&R provides ways for the user to further optimize production and service processes.

Self-cooling or externally-cooled models can be selected.

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  • Components and Modules

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8LS three-phase synchronous motors

B&R's 8LS three-phase synchronous motors have been specially developed for use in high-performance applications. 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 large selection of available 8LS three-phase synchronous motors makes it possible to easily meet conditions such as reducing the variety of parts, guaranteeing ease of service and maintaining minimum requirements on space.

An optimum selection of power transmission technology is the perfect way to round off a successful machine design. To meet this goal, specialists are available at B&R subsidiaries all over the world who are eager to share their know-how in the area of mechatronics. B&R automation components: the economical combination of mechanics, electronics, technology and innovation.

  • Compact sizes result in low weight and optimal power density
  • Single-cable solution (hybrid) available
  • Easier construction
  • Fast axes thanks to impressive dynamic properties
  • Universal application thanks to overload capability
  • Good controllability thanks to optimized torque rippling
  • Encoders for functional safety available
  • Fan-cooling or self-cooling models
  • Extremely easy to service
  • Low costs

Smooth surface

The special surface construction of 8LS three-phase synchronous motors allows them to be used in applications for the food and beverage industry. 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 for maximum cabling flexibility. Thanks to the digital signal transmission, B&R's innovative and sturdy single-cable solution (hybrid motor cables) can be used, which combines servo feedback and power for streamlined installation. The winding insulation of motors with an attachment cable and servo drive from B&R are tested extensively in accordance with IEC TS 60034-25 limit curves and are certified by the TÜV in the area of safety technology.

Embedded parameter chip

All relevant mechanical and electrical information and data is stored in the EnDat encoder used for 8LS 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 rated 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 user 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

Cooling type A

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

Cooling type C

8LS three-phase synchronous motors with cooling type C are based on motors with cooling type A.

They are separately cooled and the only difference is a fan module mounted in the area of the B-side bearing.

The motors must be installed on the cooling surface (flange). The fan module increases the nominal torque (MN), nominal current (IN), stall torque (M0) and stall current (I0) by 30% as compared to the respective motors with cooling type A.

Cooling type E

8LS three-phase synchronous motors with cooling type liquid-cooled A-flange.

These are available in sizes 4, 6 and 8 upon request.

Sizes

8LS three-phase synchronous motors are available in seven different sizes (2 through 8). 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.

Type E is only available upon request.

  • Cooling type
    Available sizes
     
    2
    3
    4
    5
    6
    7
    8
    A
    Yes
    Yes
    Yes
    Yes
    Yes
    Yes
    Yes
    C
    -
    -
    Yes
    Yes
    Yes
    Yes
    Yes
    E
    -
    -
    Yes
    -
    Yes
    -
    Yes
Lengths

8LS three-phase synchronous motors are available in up to eight 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. Since type E is only available upon request, only A and C are listed here.

  • Length
    Available sizes
     
    21)
    31)
    4
    5
    6
    7
    8
    3
    Yes
    Yes
    Yes
    Yes
    Yes
    Yes
    Yes
    4
    Yes
    Yes
    Yes
    Yes
    Yes
    Yes
    Yes
    5
    Yes
    Yes
    Yes
    Yes
    Yes
    Yes
    Yes
    6
    Yes
    Yes
    Yes
    Yes
    Yes
    Yes
    Yes
    7
    -
    Yes
    -
    Yes
    -
    Yes
    -
    8
    -
    -
    -
    -
    -
    Yes
    -
  • 1)
    Only for cooling type A
  • Length
    Available sizes
     
    2
    3
    4
    5
    6
    7
    8
    A
    -
    -
    -
    Yes1)
    -
    -
    -
    B
    -
    -
    -
    Yes1)
    -
    -
    -
    C
    -
    -
    -
    Yes1)
    -
    -
    -
  • 1)
    Only for cooling type C
Feedback systems specified to meet your needs

8LS three-phase synchronous motors are available with different 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 8LS three-phase synchronous motors are also available with resolvers.

Load capacity of the shaft end and bearings

8LS three-phase synchronous motors are equipped with grooved ball bearings that are sealed on both sides and lubricated. Radial and axial forces (Fr, Fa) applied to the shaft end during operation and installation must be within the specifications listed below. 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

8LS three-phase synchronous motors can be delivered with various options depending on the cooling type, size and length:
 

  • With various nominal speeds
  • With or without an oil seal
  • With or without a holding brake
  • With reinforced brake
  • With a smooth or keyed shaft
  • With reinforced bearings
  • With two different connection directions (two cables)
  • Now also with single-cable (hybrid) solution

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).

Special motor options

8LS three-phase synchronous motors can be delivered with special motor option "Reinforced A-side bearing" depending on the cooling type, size and length: Other special motor options must be arranged with B&R.

The special motor option is listed as part of the model number in the form of a 2-digit code (gg).

8LS motors with special motor option "Reinforced A-side bearing" can handle increased radial and axial forces (Fr , Fa) on the end of the shaft. Information for determining permissible values of Fr and Fa can be found in the respective motor data.

Motors with special motor option "Reinforced A-side bearing" have increased values (in relation to motors with standard bearings) for the dimensions of the motor shaft, including the total length. The exact dimensions can be found in the motor data in the respective technical data.

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