Y2EJ Series 8-Pole Electromagnetic Brake Motor
Eight-pole squirrel-cage induction motor with integral DC electromagnetic disc brake, running at approximately 720 rpm with fail-safe positive stopping on power interruption. The slowest and highest-torque pole configuration in the Y2EJ range — designed for very slow load speeds, heavy starting duties, and applications where minimising the required gearbox reduction ratio is a primary design objective.
Power: 0.18 – 15 kW
Frames: 71M – 180L
Brake: DC Spring-Applied
Protection: IP54
Insulation: Class F
Maximum Torque Density and Minimum Gearbox Ratio in the Y2EJ Range
The Y2EJ 8-pole brake motor is the highest-torque variant in the Y2EJ series. At 720 rpm, shaft torque is double that of a 4-pole motor and 33% higher than a 6-pole motor at the same power rating and frame size. This torque advantage makes it possible to drive heavy loads through single-stage gearboxes in applications where other pole configurations would require two-stage reduction, with corresponding savings in gearbox cost, weight, and maintenance complexity.
The spring-applied DC electromagnetic brake operates at 720 rpm input speed, which means brake disc kinetic energy per stop is the lowest in the Y2EJ range. Each braking event dissipates approximately 84% less kinetic energy than an equivalent 2-pole motor stop, and 75% less than a 4-pole stop. This dramatically extends brake lining service life in high-cycle applications such as section gates, positioning drives, and start-stop conveyors where brake longevity is a key maintenance cost driver.
Frame sizes cover 71M through 180L, spanning 0.18 kW to 15 kW. All models carry the same IP54 protection, Class F insulation, and CE marking as the rest of the Y2EJ range, with the same rectifier, brake coil, and friction disc replacement architecture for service consistency across all pole configurations in a mixed installation.
View the complete brake motor family on the Electromagnetic Brake Motors page, or explore high-torque helical solutions at Helical Gear Reducers.
Y2EJ 8-Pole Model Specifications
All 8-pole models: ~720 rpm, 380 V 50 Hz, IP54, Class F. Brake voltage: DC 205 V (rectified from 380 V AC supply).
| Model | Frame | kW | Full-Load A | η % | cosφ | Brake Torque (N·m) | Stop Time (s) | kg |
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| Y2EJ71M1-8 | 71M | 0.18 | 0.88 | 51.0 | 0.60 | 3.5 | < 0.40 | 12.5 |
| Y2EJ71M2-8 | 71M | 0.25 | 1.18 | 54.0 | 0.61 | 5.0 | < 0.40 | 14.0 |
| Y2EJ80M1-8 | 80M | 0.37 | 1.66 | 57.0 | 0.62 | 7.0 | < 0.40 | 21.0 |
| Y2EJ80M2-8 | 80M | 0.55 | 2.34 | 60.0 | 0.63 | 10.0 | < 0.40 | 23.5 |
| Y2EJ90S-8 | 90S | 0.75 | 3.04 | 63.0 | 0.64 | 14.0 | < 0.40 | 32.0 |
| Y2EJ90L-8 | 90L | 1.1 | 4.26 | 66.0 | 0.65 | 20.0 | < 0.40 | 39.0 |
| Y2EJ100L1-8 | 100L | 1.5 | 5.60 | 69.0 | 0.66 | 28.0 | < 0.40 | 54.0 |
| Y2EJ100L2-8 | 100L | 2.2 | 7.94 | 71.0 | 0.67 | 38.0 | < 0.40 | 62.0 |
| Y2EJ132S-8 | 132S | 3.0 | 9.60 | 74.0 | 0.68 | 55.0 | < 0.40 | 102.0 |
| Y2EJ132M-8 | 132M | 4.0 | 12.40 | 76.0 | 0.68 | 70.0 | < 0.40 | 122.0 |
| Y2EJ160M-8 | 160M | 5.5 | 16.60 | 78.5 | 0.69 | 100.0 | < 0.40 | 184.0 |
| Y2EJ160L-8 | 160L | 7.5 | 22.20 | 80.0 | 0.70 | 140.0 | < 0.40 | 218.0 |
| Y2EJ180L-8 | 180L | 11 | 32.00 | 82.0 | 0.70 | 200.0 | < 0.40 | 270.0 |
Motor and Brake Conditions
| Ambient temperature | −15 °C to +40 °C |
| Motor supply | 380 V 50 Hz 3-phase |
| Brake supply | DC 205 V (from rectifier) |
| Brake action | Spring-applied / EM-released |
| Brake engage time | < 0.4 s |
| Protection | IP54 (motor and brake) |
| Insulation class | Class F |
| Mounting | IMB3 / IMB5 / IMB35 |
| Manual brake release | Lever (optional) |
Standards and Certifications
| Motor design | IEC 60034 |
| Brake standard | IEC 60947-4 |
| Frame dimensions | IEC 72-1 |
| Protection rating | IEC 60529 |
| Quality management | ISO 9001 |
| Marking | CE |
| Poles | 8-pole |
| Duty cycle | S1 / S3 (cyclic) |
Typical Applications for Y2EJ 8-Pole Brake Motors
Apron Feeder Conveyors
Heavy apron feeders under rock crushers and primary hopper gates use the 8-pole brake motor for its maximum starting torque under full static load, combined with the fail-safe brake that holds the loaded apron stationary when the motor is de-energised between feed cycles.
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Heavy Viscous Agitators
Large polymer, adhesive, and slurry agitators starting under full viscous load use the 8-pole motor for its maximum torque-to-current ratio at start, minimising the supply current spike while delivering the breakaway torque needed to overcome the static viscous resistance of cold or settled material.
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Sluice and Weir Gates
Water control gate drives on irrigation canals, reservoirs, and treatment works use the 8-pole brake motor for its low operating speed and the absolute load-holding requirement: the fail-safe brake must hold the gate position against full hydrostatic head pressure without electrical power.
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Rotary Kiln Barring
Auxiliary slow-turning drives for cement and mineral processing kilns use the 8-pole brake motor to rotate the shell at 1 to 3 rpm through a high-ratio gearbox during warm-up and cool-down phases, preventing thermal distortion. The brake holds the kiln at any position when turning is paused.
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Mooring Winches
Auxiliary mooring winches and capstan drives on small vessels use the 8-pole brake motor because its low speed and high torque allow single-stage gearbox reduction to the winch drum speed, and the integral brake provides the mandatory load-holding for mooring lines under vessel motion loads.
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Sports Facility Barriers
Retractable advertising boards, pitch-side barriers, and motorised goal frames in sports facilities use 8-pole brake motors for slow controlled movement and positive position holding at end stops, both important for spectator safety during high-traffic events.
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The 8-Pole Brake Motor Compared Across the Y2EJ Pole Range
Shaft Torque at Equal Power
At 4 kW rated power: 2-pole motor at 2880 rpm gives 13.3 N·m; 4-pole at 1440 rpm gives 26.5 N·m; 6-pole at 960 rpm gives 39.8 N·m; 8-pole at 720 rpm gives 53.1 N·m. The 8-pole motor produces four times the shaft torque of a 2-pole motor at the same power rating, allowing a gearbox ratio one-quarter as large for the same output shaft torque — the difference between a single-stage 10:1 worm gearbox and a two-stage 40:1 assembly.
Brake Disc Lining Life
Lining wear per stop is proportional to kinetic energy dissipated. A rotor spinning at 720 rpm stores (720/2880)² = 6.25% of the kinetic energy of the same-inertia rotor spinning at 2880 rpm. This means that at the same stopping frequency, the 8-pole brake disc lining lasts approximately 16 times longer than the 2-pole lining, and approximately 4 times longer than the 4-pole lining. For a packaging machine making 60 stops per hour, 8 hours per day, this translates from monthly lining replacement (2-pole) to annual or less (8-pole) for the same brake disc size.
Power Factor and Starting Current
The 8-pole motor has the lowest power factor (0.60 to 0.70) and lowest starting current multiplier (Ist/In approximately 4.5 to 5.5) in the Y2EJ range. The low Ist/In is a practical advantage in installations with limited supply capacity: a 4 kW 8-pole motor draws approximately 55 A on start compared to approximately 80 A for a 4-pole motor of the same power, allowing a smaller upstream fuse and supply cable. Power factor correction capacitors are recommended for sites where reactive power tariff penalties apply.
Frequently Asked Questions — Y2EJ Series 8-Pole Brake Motor
Request a Quote for Y2EJ 8-Pole Brake Motors
Specify power (kW), required brake torque, duty cycle, mounting type, and gearbox pairing. Learn about our manufacturing on the About Us page.
Επιπλέον πληροφορίες
| Editor | Cxm |
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