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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.

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)

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)

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)

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
10 < f ≤ 500 Hz

≤500 m/s²

Shock during operation
Duration 11 ms

≤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)

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)

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)

8LWA servo motors are available with a form A oil seal per DIN 3760.


With an oil seal, the motors have IP65 protection per EN 60034-5.

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)

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)

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 mount 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)

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)

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

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

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.

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