{"id":261,"date":"2026-07-10T06:03:23","date_gmt":"2026-07-10T06:03:23","guid":{"rendered":"https:\/\/industrialelectricmotor.net\/?p=261"},"modified":"2026-07-10T06:03:23","modified_gmt":"2026-07-10T06:03:23","slug":"brake-motor-for-overhead-crane-and-hoist","status":"publish","type":"post","link":"https:\/\/industrialelectricmotor.net\/fi\/brake-motor-for-overhead-crane-and-hoist\/","title":{"rendered":"Brake Motor for Overhead Crane and Hoist"},"content":{"rendered":"
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Korea Ever-Power \u00b7 Y2EJ Series \u00b7 Hoist and Crane Drive Guide<\/span><\/p>\n

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Brake Motor for Overhead Crane and Hoist:
\nSelection Guide<\/span><\/h1>\n

An overhead crane or chain hoist that uses a standard motor without an integral brake relies entirely on the motor\u2019s back-EMF or a separate external brake to hold a suspended load \u2014 neither of which is fail-safe. A brake motor with a spring-applied electromagnetic brake holds the load automatically whenever power is removed, making it the mandatory specification for any hoist where an uncontrolled descent would present a safety or production risk. This guide covers brake torque selection, stop time calculation, duty class, and Korea Ever-Power Y2EJ specifications for crane and hoist applications.<\/p>\n

Fail-Safe Spring Brake<\/span>
\nStop Time < 0.3 s<\/span>
\n2.0\u20134.0\u00d7 Brake Torque<\/span>
\nS3 Crane Duty<\/span>
\n0.18\u201345 kW<\/span><\/div>\n<\/div>\n<\/div>\n

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\n
\n
Fail-safe<\/div>\n
Brake holds on power loss<\/div>\n<\/div>\n
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< 0.3 s<\/div>\n
Hoist stop time requirement<\/div>\n<\/div>\n
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2.0\u20134.0\u00d7<\/div>\n
Brake torque over motor rated<\/div>\n<\/div>\n
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S3 \/ S4<\/div>\n
Crane duty class<\/div>\n<\/div>\n
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0.18\u201345 kW<\/div>\n
Y2EJ hoist power range<\/div>\n<\/div>\n<\/div>\n

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\"Brake<\/p>\n
Korea Ever-Power Y2EJ series brake motor \u2014 the spring-applied electromagnetic brake mounted on the non-drive end engages automatically within milliseconds of power removal, making it the standard and safest drive specification for overhead crane hoist mechanisms where uncontrolled load descent must be prevented.<\/div>\n<\/div>\n

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Contents<\/div>\n
1. Why Hoists Need a Fail-Safe Brake<\/a>
\n2. Spring-Applied Brake for Hoist Safety<\/a>
\n3. Brake Torque Selection: 1.5\u00d7 to 4\u00d7<\/a>
\n4. Stop Time Calculation<\/a>
\n5. Crane Duty Class S3 \/ S4<\/a>
\n6. Y2EJ Specifications for Crane and Hoist<\/a>
\n7. Crane and Hoist Applications<\/a>
\n8. Frequently Asked Questions<\/a><\/div>\n<\/div>\n

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1. Why Hoists Need a Fail-Safe Brake Motor<\/h2>\n

A crane hoist lifts and suspends loads against gravity. Whenever the hoist motor is de-energised \u2014 whether intentionally at the end of a lift cycle or unintentionally due to a power failure, motor overload trip, or contactor fault \u2014 the suspended load will fall under gravity unless a holding mechanism is engaged. The severity of an uncontrolled descent ranges from product damage and crane damage to fatal injury in man-riding or overhead work areas.<\/p>\n

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Why Motor Back-EMF Is Not Adequate<\/div>\n

When power is removed from a standard induction motor, the rotor decelerates due to friction only. There is no regenerative braking action without a power supply, and the motor provides no meaningful retarding torque below approximately 20% of synchronous speed. A hoist motor without a mechanical brake will allow the load to descend under gravity at a speed limited only by rope speed and friction \u2014 typically 0.5 to 2.0 m\/s for a standard workshop hoist.<\/p>\n<\/div>\n

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Why External Mechanical Brakes Are Not Preferred<\/div>\n

An external brake mounted on the hoist gear output shaft or on the load chain drum requires separate mounting, alignment, and control wiring. The brake must be connected to a control signal that coordinates exactly with motor contactor operation \u2014 any timing error between motor de-energisation and brake engagement allows load drift. External brakes on hoists also require periodic manual adjustment and are more susceptible to contamination from the crane environment than an integral motor brake.<\/p>\n<\/div>\n

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Why Integral Brake Motor Is the Standard Solution<\/div>\n

The Y2EJ brake motor integrates the motor and brake into a single sealed unit sharing one terminal box. The brake DC supply is derived from the same three-phase supply as the motor through an internal rectifier, ensuring the brake releases simultaneously with motor energisation and engages simultaneously with motor de-energisation. There is no external brake wiring, no separate mounting, no timing relay, and no alignment procedure. The integral design eliminates all the coordination failure modes of external brake systems.<\/p>\n<\/div>\n<\/div>\n<\/div>\n

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2. Spring-Applied Brake: Fail-Safe for Hoist Safety<\/h2>\n

The Y2EJ brake motor uses a spring-applied, electrically released electromagnetic brake. This is a fail-safe design: the springs hold the brake engaged and the load stationary as the default state. Electrical power is required to release the brake and allow the motor to run. This means that any interruption of power \u2014 intentional stop, power failure, overload trip, or emergency stop \u2014 automatically engages the brake and stops the load without any control action required.<\/p>\n

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Hoist Cycle: Power On \u2192 Lift \u2192 Stop \u2192 Hold<\/div>\n
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Step 1: Energise<\/div>\n

Hoist up or down contactor closes. Three-phase supply energises motor winding; DC rectifier energises brake coil. Electromagnet overcomes spring force; brake releases. Motor accelerates to rated speed within 0.5\u20131.5 s depending on load inertia.<\/p>\n<\/div>\n

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Step 2: Running<\/div>\n

Motor lifts or lowers load at rated speed. Brake coil remains energised; brake disc rotates freely without contact. No wear during running phase.<\/p>\n<\/div>\n

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Step 3: Stop and Hold<\/div>\n

Contactor opens. Motor and brake coil de-energise simultaneously. Springs engage brake disc within 50\u2013150 ms. Motor decelerates from rated speed to zero in 0.1\u20130.4 s depending on brake torque and load inertia. Load held stationary indefinitely with no power required.<\/p>\n<\/div>\n

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Power Failure<\/div>\n

Same as Step 3 \u2014 brake engages automatically. Load is held securely. No auxiliary power supply required for brake holding. This is the fail-safe characteristic that makes the spring-applied brake mandatory for hoist and crane applications.<\/p>\n<\/div>\n<\/div>\n<\/div>\n<\/div>\n

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3. Brake Torque Selection: 1.5\u00d7 to 4\u00d7 Rated Motor Torque<\/h2>\n

The brake torque must be sufficient to decelerate the load from rated hoist speed to zero within the required stop time, and to hold the load stationary against gravity without slipping under the maximum rated load. For hoist applications, the brake torque selection depends on whether the hoist is classified as a material hoist or a man-riding (personnel) hoist, and on the rope system multiplication factor.<\/p>\n

\n\n\n\n\n\n\n\n\n\n
Hoist Application<\/th>\nRequired Stop Time<\/th>\nBrake Torque Ratio<\/th>\nRegulatory Basis<\/th>\n<\/tr>\n<\/thead>\n
Man-riding hoist (personnel lift)<\/td>\n< 0.15 s<\/td>\n3.0\u20134.0\u00d7 rated<\/td>\nEN 14492-2; AS 1418.3; local lifting regs<\/td>\n<\/tr>\n
Overhead travelling crane (SWL above 1 t)<\/td>\n< 0.25 s<\/td>\n2.0\u20133.0\u00d7 rated<\/td>\nFEM 1.001; ISO 4301; EN 13001<\/td>\n<\/tr>\n
Chain hoist \/ workshop hoist<\/td>\n< 0.30 s<\/td>\n1.5\u20132.5\u00d7 rated<\/td>\nEN 14492-1; AS 1418.2<\/td>\n<\/tr>\n
Jib crane \/ slewing crane hoist<\/td>\n< 0.30 s<\/td>\n1.5\u20132.5\u00d7 rated<\/td>\nEN 13001; local crane regulations<\/td>\n<\/tr>\n
Monorail hoist (under beam)<\/td>\n< 0.35 s<\/td>\n1.5\u20132.0\u00d7 rated<\/td>\nEN 14492-1<\/td>\n<\/tr>\n<\/tbody>\n<\/table>\n<\/div>\n
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Safety note: For man-riding hoists, never rely on the worm gear self-locking property as the primary safety holding mechanism. Self-locking can be lost under vibration, thermal variation of lubricant viscosity, or at gear ratios near the borderline. The EN 14492-2 standard for electric hoists used in man-riding service requires a certified brake with a documented and tested holding torque at least 1.5\u00d7 the rated suspended load torque, as a separate and independent mechanism from the gear train.<\/p>\n<\/div>\n<\/div>\n

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4. Stop Time Calculation for Hoist Brake<\/h2>\n
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Hoist Stop Time Formula and Example<\/div>\n
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Stop time (seconds):<\/div>\n
t = J\u2011total \u00d7 \u03c9 \u00f7 (M\u2011brake \u2212 M\u2011load)<\/div>\n
J-total = total inertia at motor shaft (kg\u00b7m\u00b2)
\n\u03c9 = angular velocity at rated speed (rad\/s)
\nM-brake = brake torque (N\u00b7m)
\nM-load = load torque at motor shaft (N\u00b7m)<\/div>\n<\/div>\n
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Workshop hoist example (500 kg load, 2-reeved):<\/div>\n
Motor: 0.75 kW, 4-pole, 1,450 rpm
\n\u03c9 = 1,450 \u00d7 \u03c0 \u00f7 30 = 151.8 rad\/s
\nMotor rated torque = 9,550 \u00d7 0.75 \u00f7 1,450 = 4.95 N\u00b7m
\nJ-total (motor + drum) = 0.012 kg\u00b7m\u00b2
\nM-brake (2.0\u00d7) = 9.9 N\u00b7m; M-load at motor shaft = 1.8 N\u00b7m
\nt = 0.012 \u00d7 151.8 \u00f7 (9.9 \u2212 1.8) = 0.22 s \u2192 within 0.30 s limit<\/strong><\/div>\n<\/div>\n<\/div>\n<\/div>\n

Load torque at motor shaft is the load gravitational torque reflected through the rope system, gearbox ratio, and pulley efficiency. For a 2-reeved rope system with a 500 kg load and gearbox ratio of 20:1 with 85% gearbox efficiency: M-load at motor = (500 \u00d7 9.81 \u00d7 0.1) \u00f7 (2 \u00d7 20 \u00d7 0.85) = 490.5 \u00f7 34 = 14.4 N\u00b7m. Verify that brake torque exceeds this load torque by at least the required safety multiple.<\/p>\n<\/div>\n

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5. Crane Duty Class: S3 and S4<\/h2>\n
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S3 Intermittent Periodic Duty<\/div>\n

The motor runs for a defined on-time then stops for a rest time, repeating at regular intervals. The Y2EJ motor nameplate power at S3 duty is rated at a specific cyclic duration factor (CDF) \u2014 typically 15%, 25%, or 40% on-time. A Y2EJ motor rated 1.5 kW at S3 25% CDF can produce 1.5 kW during the on-period provided each on-period does not exceed the rated time and the off-period provides adequate cooling. Hoist and crane duty typically falls in the S3 25% to 40% range for normal warehouse and workshop operation.<\/p>\n

Typical: workshop chain hoist, small overhead crane, jib crane up to 60 lifts\/hour<\/div>\n<\/div>\n
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S4 Intermittent Periodic with Starting<\/div>\n

S4 duty accounts for the thermal losses during frequent starting as a significant portion of total motor heating, not just running losses. For intensively cycled cranes making more than 60 lifts per hour \u2014 steel plant cranes, container cranes, and high-throughput industrial cranes \u2014 the motor must be selected for S4 duty or the starts per hour must be verified against the Y2EJ maximum permissible starting frequency. Korea Ever-Power Y2EJ series motors are rated for up to 240 braking operations per hour in continuous cyclic service.<\/p>\n

Typical: production overhead crane, container handling, AS\/RS stacker crane hoist<\/div>\n<\/div>\n<\/div>\n<\/div>\n

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6. Korea Ever-Power Y2EJ for Crane and Hoist<\/h2>\n
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The Korea Ever-Power Y2EJ series brake motor is the standard specification for chain hoists, workshop overhead cranes, jib cranes, and monorail hoists. The integral spring-applied electromagnetic brake provides a static holding torque of 1.5 to 4.0 times rated motor torque depending on the size and brake model selected \u2014 covering the full range from light workshop chain hoists through heavy-duty production crane applications. The full Y2EJ range is available in the brake motor product section<\/a>.<\/p>\n

For hoist applications requiring very fast stop times (below 0.15 s for man-riding) or for crane bridges where long cross-travel distances require accurate stopping at shelf positions, Korea Ever-Power recommends contacting the technical team<\/a> for a motor brake system sizing specific to the application duty class, rope system, and required stop distance.<\/p>\n<\/div>\n

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Y2EJ \u2014 Crane and Hoist Data<\/div>\n\n\n\n\n\n\n\n\n\n\n\n
Power range<\/td>\n0.18\u201345 kW<\/td>\n<\/tr>\n
Poles (hoist)<\/td>\n4P (1,450 rpm) standard<\/td>\n<\/tr>\n
Brake type<\/td>\nSpring-applied, DC released<\/td>\n<\/tr>\n
Brake coil voltage<\/td>\n24 V DC (integral rectifier)<\/td>\n<\/tr>\n
Stop time (typical)<\/td>\n0.10\u20130.40 s<\/td>\n<\/tr>\n
Brake torque ratio<\/td>\n1.5\u20134.0\u00d7 rated motor torque<\/td>\n<\/tr>\n
Max starts\/hour<\/td>\n240 braking ops\/hour<\/td>\n<\/tr>\n
Manual release<\/td>\nStandard on all models<\/td>\n<\/tr>\n
Protection<\/td>\nIP54 motor + brake<\/td>\n<\/tr>\n<\/tbody>\n<\/table>\n<\/div>\n<\/div>\n<\/div>\n<\/div>\n

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7. Crane and Hoist Applications<\/h2>\n\n\n\n
\"Brake<\/p>\n
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Overhead Travelling Crane (EOT Crane)<\/div>\n

Single-girder and double-girder electric overhead travelling (EOT) cranes in workshops and warehouses use Y2EJ brake motors for the hoist mechanism in the 0.75 to 15 kW range at 4-pole (1,450 rpm) with rope drum gearboxes. Bridge travel and cross-travel drives use separate Y2EJ motors in the 0.37 to 3.0 kW range to provide accurate positioning and load-free stopping at the end of each traverse. Brake torque 2.0 to 3.0 times rated for all EOT crane hoist motors; IP54 enclosure is standard for indoor industrial crane applications.<\/p>\n<\/div>\n<\/td>\n

\"Brake<\/p>\n
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Chain Hoists and Workshop Lifting Equipment<\/div>\n

Electric chain hoists from 0.25 to 5 t use Y2EJ brake motors in the 0.18 to 2.2 kW range. The brake motor is the core component of every electrically operated chain hoist design \u2014 it lifts the chain at rated speed, holds the load indefinitely when stopped, and limits descent speed during lowering. Korea Ever-Power Y2EJ 4-pole brake motors with 1.5 to 2.5 times rated brake torque are the standard specification for chain hoist OEM manufacturers requiring a compact, reliable, and cost-effective hoist motor unit.<\/p>\n<\/div>\n<\/td>\n<\/tr>\n<\/tbody>\n<\/table>\n

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Jib Crane and Pillar Crane<\/div>\n

Workshop jib cranes and pillar-mounted slewing cranes up to 2 t use Y2EJ 0.37 to 2.2 kW for hoist, and separate Y2EJ or standard motors for the slewing drive. Compact 4-pole Y2EJ fits within the standard hoist trolley envelope without increasing crane hook path dimensions.<\/p>\n<\/div>\n

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Monorail and Under-Beam Hoist<\/div>\n

Monorail hoist systems in automotive assembly, food processing, and warehouse pick-and-place use Y2EJ 0.18 to 3.0 kW with precise stopping for positioning at work stations. Brake motor ensures load does not drift between work stations when hoist motor stops.<\/p>\n<\/div>\n

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Dock Leveller and Loading Bay<\/div>\n

Dock leveller lip and platform drive motors require fail-safe braking to hold the leveller at any intermediate position during vehicle loading. Y2EJ 0.37 to 0.75 kW with 2.0 times brake torque is the standard specification for powered dock leveller drive units.<\/p>\n<\/div>\n

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Goods Lift and Mezzanine Lift<\/div>\n

Goods lifts and mezzanine freight lifts (not passenger lifts) use Y2EJ brake motors with 2.0 to 3.0 times rated brake torque. The Y2EJ 4-pole 0.75 to 5.5 kW range covers goods lifts up to approximately 500 kg SWL with standard travel speeds of 0.15 to 0.30 m\/s.<\/p>\n<\/div>\n<\/div>\n<\/div>\n

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\"Korea<\/p>\n

Rotor Production<\/div>\n<\/div>\n
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\"Korea<\/p>\n

Brake Test<\/div>\n<\/div>\n
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\"Korea<\/p>\n

CE and ISO Certified<\/div>\n<\/div>\n
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\"Korea<\/p>\n

Global Customers<\/div>\n<\/div>\n<\/div>\n

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8. Frequently Asked Questions<\/h2>\n
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Can I use a VFD with a Y2EJ brake motor on a hoist for smooth lowering speed control?<\/div>\n<\/div>\n
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Yes, but the brake control must be handled carefully. When a Y2EJ brake motor is driven by a VFD, the internal brake rectifier cannot take its DC supply from the VFD output \u2014 it must be supplied from a separate mains-connected rectifier. The brake release and engagement must be coordinated with the VFD start and stop commands through the control system, with a controlled delay to ensure the VFD has established full speed control before the brake releases, and the brake engages before the VFD output is removed. For variable-speed hoist applications, Korea Ever-Power recommends using the YVF2 inverter-duty motor for the hoist drive, with a separate DC braking module and a safety-rated brake contactor that meets the crane duty cycle requirements. Please contact our technical team for a full variable-speed hoist specification.<\/p>\n<\/div>\n<\/div>\n

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How do I test the brake on an installed Y2EJ hoist motor?<\/div>\n<\/div>\n
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Brake testing on a hoist motor should be carried out with a suspended test load equal to 125% of the hoist rated safe working load (SWL) per EN 14492 or the applicable local standard. With the test load suspended at approximately 300 mm above the floor, de-energise the hoist motor and observe that the load stops within the required time and does not drift during a 10-minute static hold period. The stop distance at rated speed divided by the time period gives the average deceleration rate, which can be compared against the brake specification. Annual brake testing with rated load is recommended as part of the crane inspection schedule. If the brake shows drift under rated load, the air gap between armature and electromagnet face must be checked and adjusted per the Y2EJ maintenance procedure before returning the hoist to service.<\/p>\n<\/div>\n<\/div>\n

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What is the difference between the hoist motor brake torque ratio and the crane safety factor?<\/div>\n<\/div>\n
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The brake torque ratio (for example, 2.5 times rated motor torque) describes the relationship between the brake holding torque and the motor continuous running torque. This ratio determines the deceleration rate and stop time. The crane safety factor (typically 3:1 to 5:1 on wire rope, 4:1 on chain) describes the ratio between the equipment breaking strength and the rated working load. These are independent parameters. A hoist can have a 3.0 times brake torque ratio (meaning the brake can produce three times the torque the motor produces at rated load) while the wire rope and hook assembly maintain a 4:1 safety factor on breaking load. Both must be specified correctly for the application \u2014 brake torque ratio determines stopping performance; crane safety factor determines structural integrity under overload and dynamic forces.<\/p>\n<\/div>\n<\/div>\n<\/div>\n<\/div>\n

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 <\/p>\n

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Korea Ever-Power \u00b7 Y2EJ Series \u00b7 Crane and Hoist Brake Motors<\/div>\n

Need a Brake Motor for Your Crane or Hoist?<\/h2>\n

Korea Ever-Power Y2EJ series: spring-applied fail-safe brake, 0.18\u201345 kW, 2P through 8P, IP54, manual release, in stock for immediate delivery. Technical hoist sizing support available.<\/p>\n

View Y2EJ Brake Motors<\/a><\/p>\n<\/div>\n<\/div>\n

Edited by Cxm<\/p>\n<\/div>","protected":false},"excerpt":{"rendered":"

Korea Ever-Power \u00b7 Y2EJ Series \u00b7 Hoist and Crane Drive Guide Brake Motor for Overhead Crane and Hoist: Selection Guide An overhead crane or chain hoist that uses a standard motor without an integral brake relies entirely on the motor\u2019s back-EMF or a separate external brake to hold a suspended load \u2014 neither of which […]<\/p>","protected":false},"author":1,"featured_media":0,"comment_status":"closed","ping_status":"closed","sticky":false,"template":"","format":"standard","meta":{"_et_pb_use_builder":"","_et_pb_old_content":"","_et_gb_content_width":"","footnotes":""},"categories":[28],"tags":[],"class_list":["post-261","post","type-post","status-publish","format-standard","hentry","category-industrial-electric-motor"],"_links":{"self":[{"href":"https:\/\/industrialelectricmotor.net\/fi\/wp-json\/wp\/v2\/posts\/261","targetHints":{"allow":["GET"]}}],"collection":[{"href":"https:\/\/industrialelectricmotor.net\/fi\/wp-json\/wp\/v2\/posts"}],"about":[{"href":"https:\/\/industrialelectricmotor.net\/fi\/wp-json\/wp\/v2\/types\/post"}],"author":[{"embeddable":true,"href":"https:\/\/industrialelectricmotor.net\/fi\/wp-json\/wp\/v2\/users\/1"}],"replies":[{"embeddable":true,"href":"https:\/\/industrialelectricmotor.net\/fi\/wp-json\/wp\/v2\/comments?post=261"}],"version-history":[{"count":1,"href":"https:\/\/industrialelectricmotor.net\/fi\/wp-json\/wp\/v2\/posts\/261\/revisions"}],"predecessor-version":[{"id":263,"href":"https:\/\/industrialelectricmotor.net\/fi\/wp-json\/wp\/v2\/posts\/261\/revisions\/263"}],"wp:attachment":[{"href":"https:\/\/industrialelectricmotor.net\/fi\/wp-json\/wp\/v2\/media?parent=261"}],"wp:term":[{"taxonomy":"category","embeddable":true,"href":"https:\/\/industrialelectricmotor.net\/fi\/wp-json\/wp\/v2\/categories?post=261"},{"taxonomy":"post_tag","embeddable":true,"href":"https:\/\/industrialelectricmotor.net\/fi\/wp-json\/wp\/v2\/tags?post=261"}],"curies":[{"name":"wp","href":"https:\/\/api.w.org\/{rel}","templated":true}]}}