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Cooling / Construction type (b)

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

Size (c)

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

4

5

A

Yes

Yes

Length (d)

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

4

5

3

Yes

-

4

Yes

Yes

5

Yes

Yes

6

Yes

Yes

7

-

Yes

8

-

Yes

Encoder systems (ee)

Resolver

BRX resolvers are used in the servo motors. These resolvers are fed with a single sinusoidal signal (reference signal) and return two sinusoidal signals. The amplitude of these signals change with the angular position (sine or cosine form).

Name

Order code (ee)

R0

Precision

10 angular minutes

Nonlinearity

1 arcminute

Vibration during operation
10 < f ≤ 500 Hz

≤100 m/s²

Shock during operation
Duration 11 ms

≤400 m/s²

EnDat encoders

EnDat is a standard developed by Johannes Heidenhain GmbH that incorporates the advantages of absolute and incremental position measurement while also offering a read/write parameter memory in the encoder. With absolute position measurement (the absolute position is sampled serially), a homing procedure for referencing is usually not required. Where necessary, a multi-turn encoder (4096 revolutions) should be installed. The single-turn encoder can also be used together with a reference switch. In this case, a homing procedure must be carried out. The incremental process allows the short deceleration periods necessary for position measurement when using drives with highly dynamic characteristics.

Different types of EnDat encoders can be used depending on requirements:

Name

Order code (ee)

E0

E1

EA

EB

Encoder type

EnDat single-turn

EnDat multi-turn

EnDat single-turn

EnDat multi-turn

Operating principle

Optical

Optical

Inductive

Inductive

EnDat protocol

EnDat 2.1

EnDat 2.1

EnDat 2.1

EnDat 2.1

Resolution

512-line

512-line

32-line

32-line

Recognizable

Revolutions

---

4096

---

4096

Precision

±60"

±60"

±180"

±180"

Cutoff frequency

≥100 kHz (-3 dB)

≥100 kHz (-3 dB)

≥6 kHz (-3 dB)

≥6 kHz (-3 dB)

Vibration during operation1)

55 < f ≤ 2000 Hz

≤300 m/s²

≤300 m/s²

≤200 m/s²

≤200 m/s²

Shock during operation2)

Duration 6 ms

≤2000 m/s²

≤2000 m/s²

≤2000 m/s²

≤2000 m/s²

Manufacturer

Internet address

Dr. Johannes Heidenhain GmbH

www.heidenhain.de

Manufacturer's product ID

ECN1313

EQN1325

ECI1319

EQI1331

1) In accordance with IEC 60 068-2-6
2) In accordance with IEC 60 068-2-27

The inductive encoders with product IDs "EA" and "EB" replace the encoder types with model numbers "E2" and "E3". These encoders should be used in all new applications.

The "EB" encoder type requires the following versions of our servo drives or inverter modules:

(ACP10_SYS or firmware version)

  • ACOPOS: Starting with V2.090 from 2008-09-18
  • ACOPOSmulti: Starting with V2.031 from 2008-01-17

For older basic versions of the ACOPOS firmware, using the new encoder is possible starting with V0.556 (from 2010-07-22) for ACOPOS with AC110 (CAN bus) and starting with V1.249 (from 2010-07-22) for ACOPOS with AC112/114.

EnDat 2.2 encoder

General information

Digital drive systems and position control loops require fast and highly secure transfer of data obtained from position measuring instruments. In addition, other data such as drive-specific characteristics, correction tables, etc. should also be available. To ensure a high level of system security, measuring instruments must be integrated in routines for detecting errors and be able to perform diagnostics.

The EnDat interface from HEIDENHAIN is a digital, bidirectional interface for measuring instruments. It is able to output position values from incremental and absolute measuring instruments and can also read and update information on the measuring instrument or store new data there. Because it relies on serial data transfer, only 4 signal lines are needed. Data is transferred synchronously to the clock signal defined by the subsequent electronics. The type of transfer used (e.g. for position values, parameters, diagnostics, etc.) is selected using mode commands sent to the measuring instrument by the subsequent electronics.

Technical data

EnDat 2.2 encoders (single-turn or multi-turn) can be used depending on requirements.

Name

Order code (ee)

D0

D1

Encoder type

EnDat single-turn

En Dat multi-turn

Operating principle

Optical

Optical

EnDat protocol

EnDat 2.2

EnDat 2.2

Position values per revolution

33 554 432 (25-bit)

33 554 432 (25-bit)

Distinguishable revolutions

---

4096

Precision

±20"

±20"

Vibration during operation1)
10 to 2000 Hz

≤300 m/s2 (IEC 60068-2-6)

≤300 m/s2 (IEC 60 068-2-6)

Shock during operation

Duration 6 ms

≤1000 m/s2 / ≤2000 m/s2 (IEC 60068-2-27)

≤1000 m/s2 / ≤2000 m/s2 (IEC 60068-2-27)

Manufacturer

Internet address

Dr. Johannes Heidenhain GmbH

www.heidenhain.de

Manufacturer's product ID

ECN 1325

EQN 1337

1) In accordance with the standard at room temperature; the following values apply at a working temperature up to 100°C: ≤300 m/s, up to 115°C: ≤150 m/s;
Nominal speed (nnn)

8LSN three-phase synchronous motors are available with up to five different nominal speeds depending on the size and length.

Size

Available nominal speeds nn[rpm]

2000

2200

3000

4500

6000

4

-

-

-

-

-

-

Yes

Yes

Yes

Yes

-

-

-

-

-

-

-

-

Yes

Yes

Yes

Yes

5

Yes

Yes

Yes

Yes

Yes

Yes

-

Yes

Yes

Yes

Yes

Yes

-

Yes

Yes

Yes

Yes

Yes

-

-

-

-

Length

4

5

6

7

7

8

3

4

5

6

7

8

3

4

5

6

7

8

3

4

5

6

Connection direction (ff)

Connection direction (ff)

  • Option "C": straight built-in connector, one each for power and signal
  • Option "D": angled swivel built-in connector, one each for power and signal
Oil seal (ff)

All 8LSN three-phase synchronous motors are available with an optional form A oil seal according to DIN 3760.

When equipped with an oil seal, the motors have IP65 protection in accordance with EN 60034-5.

Proper lubrication of the oil seal must be ensured throughout the entire service life of the motor.

Holding brake (ff)

All 8LSN three-phase synchronous motors can be delivered with a holding brake. It is installed directly behind the A flange on the motor and is used to hold the motor shaft when no power is applied to the servo motor.

The holding brake is a spring-loaded brake and is controlled by the ACOPOS servo drive or an ACOPOSmulti inverter module. Based on principle, this type of holding brake exhibits a minimal amount of backlash.

This brake is designed as a holding brake and is 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.

Name

Motor size

4

5

Holding torque MBr [Nm]

8

15

Connected load Pon [W]

18

24

Supply current Ion [A]

0.75

1

Supply voltage Uon [V]

24 VDC +6% / -10%

24 VDC +6% / -10%

Moment of inertia JBr [kgcm²]

0.54

1.66

Mass mBr [kg]

12:46 AM

0.9

Shaft end (ff)

All 8LSN three-phase synchronous motor shafts conform to DIN 748. They can be delivered with a smooth shaft or a keyed shaft.

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.

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 for 8LSN three-phase synchronous motors conform to keyway form N1 in accordance with 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 in accordance with DIN ISO 8821.

The end of the shaft has a threaded center hole that can be used to mount drive elements with shaft end plates.

Special motor options (gg)

00...No special motor options

Motor version (h)

The motor version is automatically specified by the configurator and can be seen in the technical data.

Order code motor options (ff)

The respective code (ff) for the order key can be found in the following table:

Motor option

Connectiondirection

Oil seal

Holding brake

Shaft end

Code for the order key (ff)

Straight (top connector)

No

No

Smooth

C0

Keyed

C1

Normal

Smooth

C2

Keyed

C3

Yes

No

Smooth

C6

Keyed

C7

Normal

Smooth

C8

Keyed

C9

Angled (swivel connector)

No

No

Smooth

D0

Keyed

D1

Normal

Smooth

D2

Keyed

D3

Yes

No

Smooth

D6

Keyed

D7

Normal

Smooth

D8

Keyed

D9

Example order 1

A three-phase synchronous motor of type 8LSN45 with a nominal speed of 3000 rpm was selected for an application. Because of the construction, the cables can only be connected on the top of the motor ("top" connection direction). The motor should also be equipped with a holding brake, a keyed shaft and a 16-line EnDat single-turn encoder.

The code (ee) for the encoder system is EA.

The (nnn) code for a nominal speed of 3000 rpm is 030.

The code (ff) for the other options (oil seal, holding brake, keyed shaft and connection direction) is C3.

The model number for the required motor is 8LSN45.EA030C300-0

Example order 2

A three-phase synchronous motor of type 8LSA56 with a nominal speed of 4500 rpm was selected for an application. Because of the construction, the cables can only be connected on the back of the motor (swivel connectors). The motor should also be equipped with a holding brake, a smooth shaft, an oil seal and a 16-line EnDat multi-turn encoder.

The code (ee) for the encoder system is EB.

The code (nnn) for a nominal speed of 4500 rpm is 045.

The code (ff) for the other options (oil seal, holding brake, smooth shaft end and connection direction) is D8.

The model number for the required motor is 8LSN56.EB045D800-0

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