8LW | b | c | d | . | ee | nnn | ff | gg | - | h | ||||||||||||||||
Cooling / Construction type | ||||||||||||||||||||||||||
Size | ||||||||||||||||||||||||||
Length | ||||||||||||||||||||||||||
Motor encoder system | ||||||||||||||||||||||||||
Nominal speed | ||||||||||||||||||||||||||
Motor options | ||||||||||||||||||||||||||
Special motor options | ||||||||||||||||||||||||||
Motor version | ||||||||||||||||||||||||||
Order keys only provide information about possible combinations in exceptional cases.
Information about possible combinations is available in the CAD configurator.
Additional information
8LWA synchronous motors
8LWA - General motor data
8LWA - Order key
Cooling / Construction type (b)
Cooling / Construction type (b)
8LW | b | c | d | . | ee | nnn | ff | gg | - | h | |||||||||||
 | 8LW motors are only available with self-cooling type A (8LWA). These motors have a long, slender form and must be attached to the machine using the mounting flange, which also serves as a cooling surface. The cooling type is identified by a character (b) in the order number. |
Cooling type (b) | Connection technology (see motor options) | |
|---|---|---|
8LWA | Self-cooling | Built-in double angular connector |
Single-cable solution (hybrid) - Angled | ||
Single-cable solution (hybrid) - Straight | ||
Size (c)
Size (c)
8LW | b | c | d | . | ee | nnn | ff | gg | - | h | |||||||||||
 | 8LWA servo motors are available in various sizes (1, 2, 3). These differ in dimensions (especially flange dimensions) and power data. The sizes are distinguished by a character (c) in the order number. The larger this number, the larger the flange dimensions and power data of the respective motor. |
Availability
Available sizes (c) | |||
|---|---|---|---|
8LWA1 | 8LWA2 | 8LWA3 | |
8LWA | Yes | Yes | Yes |
Length (d)
Length (d)
8LW | b | c | d | . | ee | nnn | ff | gg | - | h | |||||||||||
 | 8LWA servo motors are available in various lengths. These differ in the power data with identical flange dimensions. The lengths are distinguished by a number (d) in the order number. The larger this number, the longer the respective motor. |
Availability
Available lengths (d) | ||
|---|---|---|
8LWAx2 | 8LWAx3 | |
8LWA1 | --- | Yes |
8LWA2 | Yes | Yes |
8LWA3 | --- | Yes |
Motor encoder systems (ee)
Motor encoder systems (ee)
8LW | b | c | d | . | ee | nnn | ff | gg | - | h | |||||||||||
The motors are available with EnDat encoders as well as resolvers. The encoder system is specified as part of the order number in the form of a 2-digit code (ee).
Resolver
A resolver is an analog encoder system. Resolvers are particularly robust against vibrations and high operating temperatures. Their disadvantage is the low precision of 6-10 arcminutes. There is still no multi-turn variant with resolvers.
Technical data | Resolver / Order code (ee) |
|---|---|
R0 | |
Type | RE-15-1-J04 |
Precision | 10 angular minutes |
Vibration during operation | ≤500 m/s² |
Shock during operation | ≤1000 m/s² |
Availability | Available resolvers / Order code (ee) |
|---|---|
R0 | |
8LWA1 | Yes |
8LWA2 | Yes |
8LWA3 | Yes |
EnDat 2.2 encoder
For the advanced, fully digital EnDat 2.2 protocol, the positions are generated directly in the encoder and communicated serially with the drive system. This transfer is very robust in relation to disturbances and is even certified for safety applications.
Technical data | Encoder type / Order code (ee) | |||
|---|---|---|---|---|
B8 | Z8 | B9 | Z9 | |
Operating principle | Inductive | |||
EnDat protocol | 2.2 | |||
Functional safetySee appendix B "Safety level overview for ACOPOS product family safety functions" of the SafeMOTION user's manual (MAACPMSAFEMC-ENG), which is available in the Downloads section of the B&R website. | --- | Yes | --- | Yes |
Single-turn/Multi-turn | S | M | ||
Battery-backed | --- | |||
Revolutions | 1 | 4096 | ||
Resolution [bits single-turn / bits multi-turn] | 19/0 | 19/12 | ||
Precision [''] | ±120 | |||
Cutoff frequency ≥ [kHz] | Digital pos. in the encoder | |||
Stator - Vibration during operation Max. [m/s2] | 400 | |||
Rotor - Vibration during operation Max. [m/s2] | 600 | |||
Max. shock during operation [m/s2] | 2000 | |||
Manufacturer's product ID | ECI 1119 FS EnDat22 | EQI 1131 FS EnDat22 | ||
Availability | Available encoders / Order code (ee) | |||
|---|---|---|---|---|
B8 | Z8 | B9 | Z9 | |
8LWA1 | Yes | Yes | Yes | Yes |
8LWA2 | Yes | Yes | Yes | Yes |
8LWA3 | Yes | Yes | Yes | Yes |
Nominal speed (nnn)
Nominal speed (nnn)
8LW | b | c | d | . | ee | nnn | ff | gg | - | h | |||||||||||
 | 8LWA servo motors are available with various nominal speeds. The nominal speed is specified as part of the order number in the form of a 3-digit code (nnn). |
Order code (nnn) | ||
|---|---|---|
030 | 045 | |
Nominal speed nN [rpm] | 3000 | 4500 |
Availability
Available nominal speeds nN [rpm] | ||
|---|---|---|
3000 | 4500 | |
8LWA1 | --- | Yes |
8LWA2 | Yes | Yes |
8LWA3 | Yes | Yes |
Motor options (ff)
8LW | b | c | d | . | ee | nnn | ff | gg | - | h | |||||||||||
See the following table for the corresponding code (ff) in the order key.
The first position in the code (ff) defines the connection direction with options Dx, Sx and Ux. The second position (e.g. x1, x2, x3) defines all other motor options according to the table.
Double angular built-in connector (swivel)
Encoder and power cable: Separated with their own connections
Motor option | Availability | Order code (ff) | |||||
|---|---|---|---|---|---|---|---|
Connection direction | Oil seal | Holding brake | Shaft end | 8LWA1 | 8LWA2 | 8LWA3 | |
 | --- | --- | Smooth shaft | Yes | Yes | Yes | D0 |
--- | --- | Keyed shaft | --- | Yes | Yes | D1 | |
--- |  | Smooth shaft | Yes | Yes | Yes | D2 | |
--- | Keyed shaft | --- | Yes | Yes | D3 | ||
Yes | --- | Smooth shaft | Yes | Yes | Yes | D6 | |
Yes | --- | Keyed shaft | --- | Yes | Yes | D7 | |
Yes | | Smooth shaft | Yes | Yes | Yes | D8 | |
Yes | Keyed shaft | --- | Yes | Yes | D9 | ||
Single-cable solution (hybrid), angled (swivel)
Encoder and power cable: Combined in one cable
Motor option | Availability | Order code (ff) | |||||
|---|---|---|---|---|---|---|---|
Connection direction | Oil seal | Holding brake | Shaft end | 8LWA1 | 8LWA2 | 8LWA3 | |
 | --- | --- | Smooth shaft | Yes | Yes | Yes | S0 |
--- | --- | Keyed shaft | --- | Yes | Yes | S1 | |
--- | | Smooth shaft | Yes | Yes | Yes | S2 | |
--- | Keyed shaft | --- | Yes | Yes | S3 | ||
Yes | --- | Smooth shaft | Yes | Yes | Yes | S6 | |
Yes | --- | Keyed shaft | --- | Yes | Yes | S7 | |
Yes | | Smooth shaft | Yes | Yes | Yes | S8 | |
Yes | Keyed shaft | --- | Yes | Yes | S9 | ||
Single-cable solution (hybrid) - straight
Encoder and power cable: Combined in one cable
Motor option | Availability | Order code (ff) | |||||
|---|---|---|---|---|---|---|---|
Connection direction | Oil seal | Holding brake | Shaft end | 8LWA1 | 8LWA2 | 8LWA3 | |
 | --- | --- | Smooth shaft | Yes | Yes | Yes | U0 |
--- | --- | Keyed shaft | --- | Yes | Yes | U1 | |
--- | | Smooth shaft | Yes | Yes | Yes | U2 | |
--- | Keyed shaft | --- | Yes | Yes | U3 | ||
Yes | --- | Smooth shaft | Yes | Yes | Yes | U6 | |
Yes | --- | Keyed shaft | --- | Yes | Yes | U7 | |
Yes | | Smooth shaft | Yes | Yes | Yes | U8 | |
Yes | Keyed shaft | --- | Yes | Yes | U9 | ||
Connection direction (ff)
Connection direction (ff)
Power connection and encoder connection
8LWA servo motors are available with 3 different connection options.
| Built-in double angular connector Connection direction: Angled (swivel1)) Encoder and power cable: Separated with their own connections  |
| Single-cable solution (hybrid) Connection direction: Angled (swivel1)) Encoder and power cable: Combined in one cable  |
| Single-cable solution (hybrid) Connection direction: Straight Encoder and power cable: Combined in one cable |
| 1) | Check the angle specifications and the feasibility with regard to requirements using the CAD configurator (cad.br-automation.com). |
Oil seal (ff)
Oil seal (ff)
 | 8LWA servo motors are available with a form A oil seal per DIN 3760.
|
Maintenance
To maintain functionality of the oil seal, it must be lubricated regularly with oil. An oil seal that is not lubricated will harden due to increased frictional heat and will eventually provide only dust protection.
Holding brake (ff)
Holding brake (ff)
 | 8LWA motors are available with a standard holding brake. It is installed directly behind the A-side flange on the motor and used to hold the motor shaft when the power to the servo motor is switched off. |
Technical data
8LWA1 | 8LWA2 | 8LWA3 | |
|---|---|---|---|
Holding torque MBr [Nm] | 0.35 | 2.2 | 4.0 |
Connected load POn [W] | 8 | 8.2 | 13.4 |
Maximum speed nmax [rpm] | 6000 | 12000 | 10000 |
Supply current IOn [A] | 0.33 | 0.35 | 0.56 |
Supply voltage UOn [VDC] | 24 (+6% / -10%) | ||
Moment of inertia JBr [kgcm²] | 0.013 | 0.12 | 0.38 |
Weight mBr [kg] | 0.1 | 0.19 | 0.29 |
Operating principle
The holding brake is a permanent magnet brake and can be controlled by the B&R drive system. Based on principle, this type of holding brake exhibits a minimal amount of backlash.
The brake is designed as a holding brake. It not permitted to be used for operational braking! Under these conditions, the brake has a service life of approximately 5,000,000 cycles (opening and closing the brake is one cycle). Loaded braking during an emergency stop is permitted but reduces its service life.
The required brake holding torque is determined based on the actual load torque. If not enough information is known about the load torque, it is recommended to assume a safety factor of 2.
The holding brake is not intended for normal braking. The holding brake does not provide protection for personnel. The maximum motor torque far exceeds the holding torque for the brake.
Shaft end (ff)
Shaft end (ff)
All 8LWA servo motors have shaft ends per DIN 748.
Variants
 | Smooth shaft end A smooth shaft end is used for a force-fit shaft-hub connection and guarantees a backlash-free connection between the shaft and hub as well as a high degree of operating smoothness. The end of the shaft has a threaded center hole. |
 | Keyed shaft end A keyed shaft end is used for a form-fit torque transfer with low demands on the shaft-hub connection and for handling torque in a constant direction. The keyways conform to keyway form N1 per DIN 6885-1. Form A keyed shafts that conform to DIN 6885-1 are used. Balancing motors with keyways is done using the shaft and fitment key convention per DIN ISO 8821. The end of the shaft has a threaded center hole that can be used to install machine actuators with shaft end cover plates. |
Shaft breakage due to heavy reverse operation.
The shaft key can become dislodged during heavy reverse operation. In extreme cases, the shaft could brake!
- Preferably use smooth shaft ends with clamping elements.
Motor damage due to imbalance.
If motors with a keyed shaft end are operated without the shaft key, this can result in imbalances and subsequently motor damage.
- In these cases, use a smooth shaft end.
Special motor options (gg)
Special motor options (gg)
8LW | b | c | d | . | ee | nnn | ff | gg | - | h | |||||||||||
No special motor options available. The valid code (gg) in the order number is 00.
Motor version (h)
Motor version (h)
8LW | b | c | d | . | ee | nnn | ff | gg | - | h | |||||||||||
The motor version is specified as a code (h) in the order number. Motor version 0 is currently valid.
Example order 1
Example order 1
A three-phase synchronous motor of type 8LWA22 with a nominal speed of 3000 rpm has been selected for an application.
The connection should use a single-cable solution (hybrid). The motor should be equipped with a holding brake, a keyed shaft and an EnDat single-turn encoder.
The (ee) code for the encoder system is B8.
The (nnn) code for a nominal speed of 3000 rpm is 030.
The (ff) code for the other options is S3.
The order number for the necessary motor is therefore 8LWA22.B8030S300-0.
Example order 2
Example order 2
A three-phase synchronous motor of type 8LWA33 with a nominal speed of 4500 rpm has been selected for an application.
The connection should be designed as a built-in double angular connector. The motor should be equipped without a holding brake, with a smooth shaft end and resolver encoder. The motor should also be equipped with a oil seal.
The code (ee) for the encoder system is R0.
The code (nnn) for a nominal speed of 4500 rpm is 045.
The (ff) code for the other options is D6.
The order number for the necessary motor is therefore 8LWA33.R0045D600-0.