Raydafon YEJ series is a three-phase asynchronous motor with an integrated electromagnetic DC brake. It is built for equipment that must stop quickly, hold a load, or prevent coasting after power loss. Frame sizes cover 63 to 180 with 2-pole, 4-pole and 6-pole versions from 0.12 kW up to 7.5 kW as standard, and up to 225 frame on request.
The brake engages when the motor is de-energised, so conveyors, hoists, packaging lines and door operators stop without extra brake hardware. Aluminium die-cast housing, F-class insulation and IP55 protection keep the motor running in dusty, damp or washdown environments.
Fail-safe design: the brake is released by the motor power supply. When power is cut, the spring-applied brake locks the shaft and holds the load.
AC power feeds the motor and the brake rectifier simultaneously. The electromagnet pulls the pressure plate away from the friction disc, releasing the shaft.
The rectifier output drops, the magnet loses holding force, and the spring pushes the pressure plate onto the friction disc.
The braking time depends on frame size and load inertia. The shaft stops quickly without external brake hardware.
Even on vertical loads, the spring-applied brake holds the shaft in position after the motor is de-energised.
Choose pole count for speed, then pick the frame and power for your load. Brake supply follows frame size: H≤100 uses AC220V rectified to DC99V, H≥112 uses AC380V rectified to DC170V.
These parameters apply across the YEJ series unless a custom option is selected. Test reports and material certificates are available on request.
| Parameter | Value |
|---|---|
| Frame Size | 63 – 180 (up to 225 on request) |
| Power Range (standard) | 0.12 – 7.5 kW |
| Rated Voltage | 380V, other voltages available |
| Rated Frequency | 50Hz, 60Hz available |
| Protection Grade | IP55 (IP56 / IP65 optional) |
| Insulation Class | F (B-rise assessment) |
| Cooling Method | IC411 self-cooled |
| Duty Cycle | S1 continuous, suitable for frequent start-stop |
| Brake Supply | H≤100: AC220V (DC99V); H≥112: AC380V (DC170V) |
| Brake Response | 0.15 – 0.45 s no-load |
| Ambient Temperature | -15°C to +40°C |
| Altitude | ≤1000 m |
| Mounting | B3, B5, B35 (others on request) |
Wherever a driven machine must stop quickly or hold a position after the motor is switched off, the YEJ brake motor removes the need for a separate brake.
Every YEJ motor is tested for insulation resistance, winding continuity, brake engagement torque, vibration and noise before packing.
ISO 9001:2015 quality system. Test reports and material certificates supplied with each batch. Third-party inspection available.
Common questions about brake supply, response time, vertical mounting and duty cycle.
Send the driven machine, load inertia, stop time, voltage, frequency and mounting type. Our engineers will recommend the correct YEJ frame and brake configuration, and reply within 24 hours.
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Luotuo Industrial Area, Zhenhai District, Ningbo City, China
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