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8WS

b

c

d

.

ee

iii

jj

n

o

p

v

Cooling / Construction type

Size

Length

Motor encoder system

Gear ratio

Motor options (protection class / shaft end)

Nominal speed

Connection type

Cable length

Motor version

Order keys only provide information about possible combinations in exceptional cases. Information about possible combinations is available in the CAD configurator (cad.br-automation.com).

Cooling / Construction type (b)

8WS

B

c

d

.

ee

iii

jj

n

o

p

v

8WS servo motors with cooling type / size B are based on motors with cooling type A. The motors must be installed with the mounting flange (cooling surface). They are directly mounted to the gearbox with seamlessly welded housings.

Valid code: B

Size (c)

8WS

B

c

d

.

ee

iii

jj

n

o

p

v

8WS servo motors are available in various sizes (1, 2, 3, 4). These differ in dimensions (especially flange dimensions) and power data. The different sizes are distinguished by a number (c) in the model number. The larger this number, the larger the flange dimensions and power data of the respective motor.

Available sizes (c)

1

(ø 17 mm)

2

(ø 22 mm)

3

(ø 32 mm)

4

(ø 40 mm)

8WSB

Yes

Yes

Yes

Yes

Length (d)

8WS

B

c

d

.

ee

iii

jj

n

o

p

v

The available lengths have different performance data and are distinguished by a character (d) in the model number.

Available lengths (d)

1

(Length 10)

2

(Length 20)

3

(Length 30)

8WSB1

Yes

---

---

8WSB2

Yes

---

---

8WSB3

---

Yes

---

8WSB4

---

---

Yes

Motor encoder systems (ee)

8WS

B

c

d

.

ee

iii

jj

n

o

p

v

The encoder system is listed as part of the model number in the form of a 2-digit code (ee).

The order code (ee) for the SSI encoder (single-turn) is F0.

Order code (ee)

F0

(SSI encoder, single-turn)

Supply voltage

5 V ±10%

Current consumption

60 mA effective

Number of outputs

3

SSI serial / CLK / Data differential, max. 60 mA

Absolute value generation

Digital absolute position information within one rotor revolution

Resolution

4096 positions per revolution (12-bit)

Precision

±1° (up to ±0.4° possible on request)

Maximal speed

30,000 rpm

Temperature of workspace

-40°C to 125°C

Gear ratios (iii)

Gear ratios (iii)

8WS

B

c

d

.

ee

iii

jj

n

o

p

v

The code (iii) in the model number contains the gear ratio.

Available gear ratios (gear stages)

i = 4 (1)

i = 12.25 (2)

i = 16 (2)

i = 21 (2)

i = 49 (3)

i = 50 (2)

i = 64 (3)

Order code (iii)

004

012

016

021

049

050

064

8WSB11

Yes

---

---

Yes

---

---

Yes

8WSB21

Yes

---

Yes

---

---

---

Yes

8WSB32

Yes

---

Yes

---

---

---

Yes

8WSB43

Yes

Yes

---

---

Yes

---

---

8WSB43 (hygienic design)

Yes

---

Yes

---

---

Yes

---

Motor options (jj)

Motor options (jj)

8WS

B

c

d

.

ee

iii

jj

n

o

p

v

The available motor options are summarized in the following table; they are distinguished by a code (jj) in the model number.

Protection class

Shaft end

IP54

IP66/67

IP69K

Order code (jj)

8WSB11

S1

S3

---

Flat-sided

8WSB21

S1

S3

---

Flat-sided

8WSB32

S0

S2

---

Smooth

8WSB43

S1

S3

S5

With key

Shaft end per table

(figure: 8WSB21, flat-sided shaft)

Shaft end per table

(figure: 8WSB32, smooth shaft)

Shaft end per table

(figure: 8WSB43, keyed shaft)

Nominal speed (n)

8WS

B

c

d

.

ee

iii

jj

n

o

p

v

The nominal speed is specified as part of the model number in the form of a 1-digit code (n).

Available nominal speeds nN [rpm] at 60 VDC operation

5,500 1)

8,500 1)

Order code (n)

K

Q

8WSB11

---

Yes

8WSB21

---

Yes

8WSB32

---

Yes

8WSB43

Yes

---

1) The specified motor nominal speed is limited by the max. gearbox input speed; for the resulting max. permissible motor speed, see the technical motor data.
Connection type (o)

8WS

B

c

d

.

ee

iii

jj

n

o

p

v

8WS servomotors have a hybrid motor cable permanently connected to the motor. The connection type is defined with a letter in the order code (o).

Valid code: K

Cable length (p)

8WS

B

c

d

.

ee

iii

jj

n

o

p

v

The code (p) in the model number provides information about the cable length. The available cable lengths are summarized in the following table.

Available cable lengths

0.3 m

0.5 m

1.0 m

2.0 m

3.0 m

5.0 m

Order code (p)

A

B

C

D

E

F

8WSB11

---

Yes

---

---

Yes

---

8WSB21

---

Yes

---

---

Yes

---

8WSB32

---

Yes

---

---

Yes

---

8WSB43

---

Yes

---

---

Yes

---

Motor version (v)

8WS

B

c

d

.

ee

iii

jj

n

o

p

v

The motor version is specified as a code (v) in the model number. Motor version 0 is currently valid.

Example order 1

8WS

B

c

d

.

ee

iii

jj

n

o

p

v

A gear motor of type 8WSB32 with a nominal speed of 8,500 rpm was selected for an application. The gearbox should have a gear ratio of i = 4. Protection class IP66/67 is required. The shaft end should be smooth, and the hybrid motor cable on the motor should be 0.5 m long.

The code (c) for the selected size (3 = ø 32 mm) is 3.

The code (d) for the selected length (2 = 20) is 2.

The code (ee) for the encoder system (SSI encoder, single-turn) is F0.

The code (ee) for the selected gear ratio (i = 4 = 004) is 004.

The code (ff) for the selected motor options (protection class IP66/67 and smooth shaft end) is S2.

The code (nnn) for the selected nominal speed (8,500 rpm) is Q.

The code (ff) for the connection type (hybrid motor cable permanently connected to the motor) is K.

The code (gg) for the selected cable length (0.5 m) is B.

The code (h) for the motor version (0) is 0.

The model number for the necessary motor is therefore 8WSB32.F0004S2QKB0.

Example order 2

8WS

B

c

d

.

ee

iii

jj

n

o

p

v

A gear motor of type 8WSB43 with a nominal speed of 5,500 rpm was selected for an application. The gearbox should have a gear ratio of i = 50. A hygienic design with protection class IP69K is required. The shaft end should be keyed, and the hybrid motor cable on the motor should be 3.0 m long.

The code (c) for the selected size (4 = ø 40 mm) is 4.

The code (d) for the selected length (3 = 30) is 3.

The code (ee) for the encoder system (SSI encoder, single-turn) is F0.

The code (ee) for the selected gear ratio (i = 50) is 050.

The code (ff) for the selected motor options (protection class IP69K and keyed shaft end) is S5.

The code (nnn) for the selected nominal speed (5,500 rpm) is K.

The code (ff) for the connection type (hybrid motor cable permanently connected to the motor) is K.

The code (gg) for the selected cable length (3.0 m) is E.

The code (h) for the motor version (0) is 0.

The model number for the necessary motor is therefore 8WSB43.F0050S5KKE0.

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