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Santram Engineers (SEPL) is an authorised dealer and supplier of Emco Dynatorq electromagnetic brakes in India, stocking the full range of spring-applied DC electromagnetic disc brakes for cranes, hoists, conveyors, machine tools, and packaging machinery. We supply complete brake units, replacement coils, rectifiers, armature discs, and friction pads — with same-day despatch from Ahmedabad for most standard sizes.

Looking for an Emco brake catalogue, price, or spare part? Contact us directly or call +91 96247 39393 and our team will confirm availability, current price, and lead time within the hour.

What Are Emco Dynatorq Electromagnetic Brakes?

Emco Dynatorq electromagnetic brakes are spring-applied, electrically released (SAER) disc brakes manufactured by Emco Group, one of India’s leading industrial brake and coupling manufacturers. In the de-energised (power-off) state, internal springs hold the armature plate firmly against the friction disc, applying braking torque. When the DC coil is energised, the magnetic field overcomes the spring force and pulls the armature away from the disc, releasing the brake.

This fail-safe design makes Emco electromagnetic brakes the standard choice for overhead cranes, electric hoists, and material handling conveyors — where the brake must hold the load automatically on power failure or emergency stop.

Key design features:

  • Spring-applied, electrically released (SAER) — fail-safe by design
  • DC coil operation (24 V DC or 180 V DC, full-wave or half-wave rectifier)
  • Compact flange-mount design — fits directly onto motor end shield (IEC B5 flange)
  • Manual release lever available for maintenance positioning
  • Torque range from 1.5 Nm to 800 Nm (single-disc) in the standard FDB/FMB series
  • IP55 protection standard; IP65 available on request

Emco Dynatorq Electromagnetic Brake Model Range

Emco Dynatorq produces two primary series of electromagnetic disc brakes used in Indian industry. The FDB (Flange-mounted Disc Brake) series is the most widely installed, covering IEC motor frame sizes 71 to 315.

Frame / Size Rated Torque (Nm) Coil Voltage Typical Motor Frame (IEC) Common Application
FDB 1 1.5 – 3 Nm 24 V DC / 180 V DC IEC 71–80 Small conveyors, packaging machines
FDB 2 6 – 12 Nm 24 V DC / 180 V DC IEC 90–100 Light hoists, material handling
FDB 3 20 – 25 Nm 24 V DC / 180 V DC IEC 112 Chain conveyors, light cranes
FDB 4 40 – 50 Nm 24 V DC / 180 V DC IEC 132 EOT cranes, hoists up to 2T
FDB 5 80 – 100 Nm 24 V DC / 180 V DC IEC 160 Crane travel, heavy conveyors
FDB 6 160 – 200 Nm 24 V DC / 180 V DC IEC 180–200 EOT cranes 5T–10T, hoist travel
FDB 7 320 – 400 Nm 24 V DC / 180 V DC IEC 225–250 Heavy EOT cranes, crane bridge travel
FDB 8 600 – 800 Nm 24 V DC / 180 V DC IEC 280–315 Steel plant cranes, port handling

Torque values above are for standard spring settings. Emco brakes can be adjusted to a lower torque by reducing the number of springs — refer to the brake’s adjustment sheet or contact Santram Engineers for the correct setting for your application.

For the full Emco Dynatorq electromagnetic brake catalogue with dimensional drawings, wiring diagrams, and spare part codes, contact us and we will send the relevant catalogue section by email.

Electromagnetic Brake Applications

Cranes and Hoists

The most common application for Emco Dynatorq electromagnetic brakes in India. On an overhead EOT (electric overhead travelling) crane, the brake is fitted to the hoist motor (to hold the load when power is cut) and optionally to the long-travel and cross-travel drive motors. The SAER design ensures the brake applies automatically on power loss, protecting against load drop. IEC standards for crane duty (IS 3177, IS 807) require fail-safe braking — only SAER electromagnetic brakes or hydraulic thrustor brakes satisfy this requirement.

Conveyors

On inclined belt conveyors or screw conveyors handling heavy materials (cement, coal, limestone), an electromagnetic brake prevents reverse run of the conveyor when the drive motor is stopped. The brake size is selected to hold the full loaded-belt torque — typically 1.5× the running torque as a safety margin.

Machine Tools

Electromagnetic brakes are fitted to spindle drive motors and feed-axis motors on lathes, milling machines, and grinding machines for rapid, precise stopping. In machine tool applications, stopping time and repeatability matter — brake torque is matched to the inertia of the spindle and workpiece.

Packaging and Material Handling

On packaging lines, palletisers, and automated storage systems, electromagnetic brakes provide holding torque between cycles — preventing unwanted movement when the motor is de-energised but the machine is not yet unloaded.

Emco Brake Coil: Replacement Guide

The electromagnetic coil is the most frequently replaced spare part on an Emco Dynatorq brake. A failed coil means the brake cannot release (or releases intermittently), causing the motor to run against a dragging brake — resulting in overheating and burned windings if not corrected promptly.

Signs of a failed coil:

  • Brake does not release even when power is applied to the coil terminals
  • Coil body is hot to the touch (normal warm is acceptable; burning hot is not)
  • Resistance reading across coil terminals is open circuit (∞ Ω) or very low (<5 Ω for 24 V coils)
  • Burning smell from the brake housing

How to measure coil resistance (with a multimeter):

Disconnect power. Remove the coil terminal cover. Set the multimeter to resistance (Ω). Touch the probes to the two coil terminals. Compare the reading against the values below:

Coil Voltage Expected Resistance (approx.) Fault Indication
24 V DC 18 – 30 Ω Open circuit (∞) = open winding; <5 Ω = short circuit
180 V DC 900 – 1,400 Ω Open circuit (∞) = open winding; <200 Ω = short circuit

Coil replacement procedure:

  1. Isolate the motor and brake supply. Lock out / tag out.
  2. Remove the brake cover plate (4–6 bolts on the brake body).
  3. Note the coil lead routing and terminal connections before disconnecting.
  4. Unscrew the coil retaining screw (centre bolt or clip). Slide the coil body out of the stator housing.
  5. Fit the new coil — same voltage, same frame size. Do not substitute a 24 V coil where a 180 V coil was fitted, or vice versa.
  6. Reconnect coil leads to the terminal block. Refit the cover plate.
  7. Re-energise and verify brake releases cleanly (armature should pull in with a clean click, no chattering).

When ordering a replacement Emco coil, provide: the brake model/size (e.g. FDB 4), the coil voltage (24 V DC or 180 V DC), and the serial number or motor frame size. Santram Engineers maintains stock of common coil sizes — call +91 96247 39393 for availability and Emco brake coil price.

Emco Brake Rectifier: Selection and Replacement

Emco Dynatorq electromagnetic brakes operate on DC voltage. Because most plant supplies are AC (415 V / 230 V), a rectifier (also called a brake rectifier or DC converter) is required to supply the brake coil. The rectifier converts AC to DC and also controls the engagement and release characteristics of the brake.

Rectifier types used with Emco brakes:

Rectifier Type Output Brake Response Typical Use
Half-wave (single diode) ~0.45 × VAC Slower engage/release Low-cost applications, light-duty conveyors
Full-wave bridge ~0.9 × VAC Faster, more positive engagement Cranes, hoists, standard industrial use
Full-wave with suppressor (varistor / freewheeling diode) ~0.9 × VAC Fastest release; protects coil from back-EMF spike High-cycle duty, machine tools, servo applications

Matching rectifier output to coil voltage:

For a 24 V DC coil: use a full-wave rectifier supplied from 28 V AC secondary (transformer) or a 24 V DC power supply.
For a 180 V DC coil: use a half-wave rectifier from 230 V AC single-phase supply — the half-wave output is approximately 180 V DC (0.45 × 400 V is too high for a 3-phase supply; single-phase 230 V × 0.45 × 1.41 ≈ 145 V is marginal; 230 V × 0.9 ≈ 207 V full-wave may be within tolerance depending on coil spec — always confirm with the Emco datasheet or contact Santram Engineers).

Signs of a failed rectifier:

  • Brake does not release (measure DC voltage at coil terminals — zero or very low DC despite correct AC input means rectifier has failed)
  • Brake chatters or hums when energised (intermittent rectification — typically a failed diode in a bridge)
  • Rectifier body physically burned or cracked

Rectifier replacement: Disconnect AC supply and brake coil leads. Note the terminal labelling (AC input, DC output + and −). Fit the new rectifier — same type and voltage rating. Reconnect leads. Measure DC output voltage before reconnecting the brake coil (should be close to rated coil voltage at no load).

For Emco brake rectifier price and availability, contact Santram Engineers with the brake model and coil voltage. We stock Emco OEM rectifiers and compatible equivalents for all standard FDB series sizes.

Troubleshooting: Common Emco Electromagnetic Brake Faults

Symptom Likely Cause Check / Fix
Brake does not release — motor overheats No DC voltage at coil; failed rectifier or coil; open circuit in wiring Measure DC at coil terminals. Replace rectifier or coil as indicated.
Brake chatters or hums when energised Low DC voltage (partial rectifier failure); air gap too large; broken spring Measure DC voltage. Check and reset air gap to manufacturer’s spec. Replace spring if broken.
Brake does not hold — load drifts Worn friction disc / pad; brake torque set too low; armature surface glazed Measure disc thickness — replace if below minimum. Increase number of springs to raise torque. Deglaze armature with emery cloth.
Brake slow to release — crane motion sluggish Half-wave rectifier fitted where full-wave needed; air gap too small; springs too stiff Upgrade to full-wave rectifier. Check and adjust air gap.
Excessive wear / disc replaced frequently Too many start/stop cycles; brake torque too high for the application; disc material mismatch Check duty cycle. Reduce brake torque setting. Confirm disc material matches Emco OEM spec.
Brake overheating Coil continuously energised at above-rated voltage; excessive slip cycles; failed DC rectifier supplying AC to coil Check coil supply voltage (should be within ±10% of rated). Confirm rectifier is supplying DC, not AC.

Emco Electromagnetic Brake: Price and How to Order

Emco Dynatorq electromagnetic brake prices vary by model, torque size, and coil voltage. Spare parts — coils, rectifiers, armature discs, friction pads, and complete sub-assemblies — are priced separately.

Santram Engineers supplies Emco brakes and spares across India, with stocking points in Ahmedabad, Mumbai, Bangalore, Kolhapur, Rajkot, and Morbi. Standard sizes are available for same-day or next-day despatch.

To get an Emco brake price or availability confirmation:

Provide the brake model/size (e.g. Emco FDB 4, 50 Nm), the coil voltage (24 V or 180 V), and whether you need a complete brake unit or a spare part (coil / rectifier / disc). We will confirm price and despatch timelines within the hour during business hours.

Frequently Asked Questions — Emco Electromagnetic Brakes

Where can I get the Emco Dynatorq electromagnetic brake catalogue PDF?

Santram Engineers can share the relevant sections of the Emco Dynatorq electromagnetic brake catalogue — including dimensional drawings, wiring diagrams, torque-spring tables, and spare part codes — on request. Contact us at sales@santramengineers.com or call +91 96247 39393 and mention the brake series (e.g. FDB) and size range you need. We will email the relevant catalogue section within one working day.

How do I select the right Emco brake size for my crane or hoist?

Start with the rated torque of the hoist or crane travel motor (motor nameplate full-load torque = 9,550 × kW / RPM). Select an Emco brake size with a rated torque of at least 1.5× the motor rated torque for hoist applications (holding a suspended load requires a higher safety margin) and 1.0–1.25× for travel and conveyor applications. Match the brake’s IEC frame size to the motor’s frame size for direct bolt-on fitment. If you are unsure, share the motor nameplate details with Santram Engineers and we will confirm the correct brake model.

Why is my electromagnetic brake not releasing?

The two most common causes are a failed DC rectifier and a burned coil. First, measure the DC voltage at the brake coil terminals while the brake supply is energised — it should be close to the rated coil voltage (24 V DC or 180 V DC). If the DC voltage is zero or very low, the rectifier has failed; replace it. If the DC voltage is correct but the brake still does not release, measure the coil resistance — an open circuit (∞ Ω) or short circuit (near-zero Ω) means the coil has burned out and needs replacement. A correct voltage and resistance but still-stuck brake usually means the air gap has closed up and the brake needs mechanical adjustment.

What is the difference between a 24V DC and 180V DC Emco brake coil?

The difference is the supply arrangement, not the brake’s mechanical performance. A 24 V DC coil requires a separate 24 V DC power supply or a step-down transformer with full-wave rectifier — commonly used on PLC-controlled machines and modern VFD-driven systems where 24 V DC is already available. A 180 V DC coil uses a simple half-wave rectifier fed from 230 V AC single-phase supply — the traditional arrangement on older Indian crane installations. Both are available as drop-in replacements for the same brake size; you cannot interchange coil voltages without also changing the rectifier and supply arrangement.

How long does an Emco brake coil typically last?

Under normal continuous industrial duty (8–16 hours per day, within rated voltage ±10%), an Emco Dynatorq coil typically lasts 5–10 years. Coil life is reduced by overvoltage, excessive ambient temperature above 40°C, moisture ingress, and high-frequency switching (more than the brake’s rated cycles per hour). Running the motor against a dragging brake (brake not fully releasing) is the single fastest way to burn out a coil — overheating from friction heat in the brake housing raises coil temperature above its insulation class rating within minutes.

Can I use a non-Emco rectifier with an Emco brake?

Yes, provided the replacement rectifier matches the coil voltage, AC input voltage, and rectifier type (half-wave or full-wave bridge). The coil does not know or care about the brand of rectifier — only the DC output voltage matters. However, using an undersized rectifier (lower current rating) or the wrong type (half-wave instead of full-wave) will result in slow release, chattering, or coil overheating. Santram Engineers supplies both Emco OEM rectifiers and compatible equivalents; we will confirm the correct specification for your brake model.