Brake Motors – Lafert AMBY, AMBZ and AMS
Three-phase brake motors with spring-applied electromagnetic brake – the motor stops and holds when power is cut. Lafert AMBY (high-torque DC brake), AMBZ (high-torque AC brake) and AMS (compact low-torque DC brake), 0.12 – 22 kW, frame 63 – 160, in IE1, IE2 and IE3 efficiency.
Request a quoteWhatsApp +971 50 269 7191
Need a brake motor for a hazardous area? See the flameproof RAEL BrakEx (RL platform, Ex db) and the explosion-proof motor range.
Which brake type?
| AMBY – DC high torque | AMBZ – AC high torque | AMS – DC low torque | |
|---|---|---|---|
| Brake supply | Rectifier 230 V 50/60 Hz | 230 / 400 V 50 Hz, own terminal block | Rectifier 230 V 50/60 Hz |
| Braking torque | Mb > 1.5 × MN, adjustable ≈ 33 / 67 / 100% | Mb > 1.5 × MN, adjustable ≈ 33 / 67 / 100% | Mb ≤ MN, fixed |
| Braking surfaces | Double | Double | Single |
| Starts per hour | High | Very high | Medium |
| Dimensions | Longer than standard motor | Longer than standard motor | Close to standard AM motor |
| Typical use | Packaging, transfer machines, gearmotors – smooth stop | Lifting, handling, gearmotors – high switching rate | Woodworking, cutting machines, long braking periods |
| Standard protection | IP54 (IP55 on request) | IP54 (IP55 on request) | IP54 (IP55 on request) |
Brake sizes and braking torque
| Motor frame | AMBY / AMBZ brake | Braking torque (Nm) | AMS braking torque (Nm) |
|---|---|---|---|
| 63 | 12 | 1.8 – 3.5 | 3 |
| 71 | 12 / 53 | 1.8 – 3.5 / 2.5 – 7.5 | 4 |
| 80 | 13 / 04 | 2.5 – 7.5 / 5 – 15 | 7 |
| 90 | 14 / 05 | 5 – 15 / 13 – 40 | 7 |
| 100 | 15 / 56S | 13 – 40 / 25 – 75 | 13 |
| 112 | 15 / 56S | 13 – 40 / 25 – 75 | 13 |
| 132 | 16S / 07 | 25 – 75 / 50 – 150 | 30 |
| 160 | 17 / 08 | 50 – 150 / 85 – 250 | 30 |
IE3 brake motors – AMPEBY, AMPEBZ, AMPES (400 V 50 Hz)
Max. braking torque in brackets on request. * higher-output (progressive) motor. IE2 (AMHE…) and IE1 (AM…) brake motors are available in the same frames.
2 pole – 3000 rpm (18 models)
| Type | kW | rpm | In @400 V (A) | IE3 η | Mb AMPEBY / BZ (Nm) | Mb AMPES (Nm) | Weight AMPEBY (kg) |
|---|---|---|---|---|---|---|---|
| AMPE… 71Z AA 2* | 0.75 | 2880 | 1.9 | 80.7% | 7.5 | 3 | 10.3 |
| AMPE… 80Z AA 2 | 0.75 | 2910 | 1.7 | 82.0% | 7.5 (15) | 7 | 15.3 |
| AMPE… 80Z BA 2 | 1.1 | 2870 | 2.4 | 82.7% | 15 | 7 | 17.5 |
| AMPE… 80Z CA 2* | 1.5 | 2810 | 3.6 | 84.2% | 15 | 7 | 16.2 |
| AMPE… 90S AA 2 | 1.5 | 2875 | 3.0 | 84.2% | 15 (40) | 7 | 22.0 |
| AMPE… 90L BA 2 | 2.2 | 2880 | 4.6 | 86.5% | 15 (40) | 7 | 25.6 |
| AMPE… 100L AA 2 | 3 | 2900 | 5.6 | 87.1% | 40 (75) | 13 | 32.2 |
| AMPE… 100L BA 2* | 4 | 2920 | 8.2 | 88.1% | 40 (75) | 13 | 34.5 |
| AMPE… 112M AA 2 | 4 | 2910 | 7.0 | 88.1% | 40 (75) | 13 | 42.9 |
| AMPE… 112M BA 2* | 5.5 | 2935 | 10.2 | 89.2% | 40 (75) | 13 | 45.8 |
| AMPE… 132S ZA 2 | 5.5 | 2920 | 10.0 | 89.2% | 75 (150) | 30 | 61 |
| AMPE… 132S TA 2 | 7.5 | 2910 | 13.1 | 90.1% | 75 (150) | 30 | 70 |
| AMPE… 132M ZA 2* | 9.2 | 2930 | 16.5 | 90.7% | 75 (150) | – | 77 |
| AMPE… 132M RA 2* | 11 | 2935 | 19.9 | 91.2% | 75 (150) | – | 77 |
| AMPE… 160M YA 2 | 11 | 2950 | 19.7 | 91.2% | 150 (250) | 30 | 121 |
| AMPE… 160M ZA 2 | 15 | 2940 | 26.7 | 91.9% | 150 (250) | 30 | 135 |
| AMPE… 160L ZA 2 | 18.5 | 2950 | 33.0 | 92.4% | 150 (250) | 30 | 135 |
| AMPE… 160L TA 2* | 22 | 2950 | 39.4 | 92.7% | 150 (250) | 30 | 135 |
4 pole – 1500 rpm (13 models)
| Type | kW | rpm | In @400 V (A) | IE3 η | Mb AMPEBY / BZ (Nm) | Mb AMPES (Nm) | Weight AMPEBY (kg) |
|---|---|---|---|---|---|---|---|
| AMPE… 80Z AA 4 | 0.75 | 1435 | 1.8 | 82.5% | 15 | 7 | 15.7 |
| AMPE… 90S AA 4 | 1.1 | 1440 | 2.5 | 84.1% | 15 (40) | 7 | 20.5 |
| AMPE… 90L BA 4 | 1.5 | 1430 | 3.6 | 85.3% | 40 | 7 | 24.8 |
| AMPE… 100L AA 4 | 2.2 | 1455 | 4.8 | 86.7% | 40 (75) | 13 | 31.1 |
| AMPE… 100L BA 4 | 3 | 1460 | 6.0 | 87.7% | 40 (75) | 13 | 33.6 |
| AMPE… 112M AA 4 | 4 | 1450 | 8.2 | 88.6% | 75 | 13 | 44.7 |
| AMPE… 132S AA 4 | 5.5 | 1460 | 10.6 | 89.6% | 75 (150) | 30 | 60 |
| AMPE… 132M BA 4 | 7.5 | 1465 | 14.2 | 90.4% | 75 (150) | 30 | 69 |
| AMPE… 132M CA 4 | 9.2 | 1460 | 17.3 | 91.0% | 75 (150) | 30 | 87 |
| AMPE… 160M AA 4 | 11 | 1475 | 21.0 | 91.4% | 150 (250) | 30 | 115 |
| AMPE… 160L BA 4 | 15 | 1465 | 28.5 | 92.1% | 150 (250) | 30 | 133 |
| AMPE… 160L CA 4 | 18.5 | 1470 | 37.0 | 92.6% | 250 | 30 | 157 |
| AMPE… 160L DA 4 | 22 | 1470 | 45.0 | 93.0% | 250 | – | 168 |
How to read a Lafert brake motor type
Example: AMPEBY 132M ZA 4
Options
- Hand release lever
- Encoder and axial independent cooling fan
- IP55 with dust seals and brake gasket
- Fast-acting rectifier (AMBY / AMS, 230 V 50/60 Hz)
- Anti-sticking and corrosion-resistant brake executions
- Reduced or continuously adjustable braking torque
- Flywheel, special brake designs
- cURus approval, high-resistance rotor (R3)
For Gulf projects
Three-phase brake motors are covered by efficiency rules: in Saudi Arabia choose the IE3 AMPE… brake motors from 0.75 kW (SASO 2893). Motors for 460 V 60 Hz are available on request. For hot sites, tell us the ambient temperature so we can confirm the rating.
Frequently asked questions
How does a fail-safe brake motor work?
The brake is closed by springs and opened by an electromagnet. When the supply is cut – on purpose or by a power failure – the springs apply the brake and the motor stops and holds the load.
AMBY or AMBZ?
Both give high braking torque. AMBY has a DC brake fed by a rectifier and brakes smoothly; AMBZ has an AC brake with its own terminal block and allows a very high number of starts per hour, typical for lifting and handling.
When is the compact AMS enough?
When the brake only has to stop the machine (braking torque up to the rated motor torque) and the motor must keep standard dimensions, for example woodworking and cutting machines.
Can the braking torque be adjusted?
Yes, on AMBY and AMBZ in steps of about 33, 67 and 100% of the maximum by the number of springs. AMS has a fixed torque; +50% is available on request.
Do you have explosion-proof brake motors?
Yes – the RAEL BrakEx flameproof brake motor, Ex db for Zone 1 and 2, frame 63 – 112.
Need a brake motor?
Send us kW, poles, braking torque, brake supply voltage and mounting – or a nameplate photo – and we reply with a quotation.
Data from the Lafert catalogue 10-260/24. Technical data are subject to change by the manufacturer; final values are confirmed with the quotation. Lafert is a trademark of Lafert S.p.A.