Induction motors with built-in electromagnetic brake 2–350 hp, braking torque up to 1000 ft-lb
Country: · Model: Brake Motors
Induction motor of 2–350 hp (about 1.5–261 kW) with a built-in disc electromagnetic brake, braking torque 1.5–1000 ft-lb. The brake is normally closed, so when power is lost the mechanism stops. The motor is installed on cranes and hoists, machine tools, saws and swing bridges.
- Type
- induction NEMA Design B, C, D; 1- and 2-speed; adjustable
- Power
- 2–350 hp (≈1.5–261 kW)
- Braking torque
- 1.5–1000 ft-lb (≈2–1356 N·m)
- Brake
- direct-acting electromagnetic disc, spring-applied, electromagnetically released, splined hub
Technical specifications
| Type | induction NEMA Design B, C, D; 1- and 2-speed; adjustable |
|---|---|
| Power | 2–350 hp (≈1.5–261 kW) |
| Braking torque | 1.5–1000 ft-lb (≈2–1356 N·m) |
| Brake | direct-acting electromagnetic disc, spring-applied, electromagnetically released, splined hub |
| Speed | 3600, 1800, 1200, 900 rpm; multi-speed; adjustable (1000:1 / 2000:1 at constant torque) |
| Voltage | up to 600 V, 3 phases; 60 Hz, up to 133 Hz from an inverter |
| Frame sizes | NEMA 56–449 |
| Enclosure | ODP, TEFC, TENV; continuous and intermittent duty |
| Frame | cast iron or cast aluminum; brake housing cast iron |
| Insulation | class B, F, H, VPI |
Specifications are taken from the manufacturer’s technical documentation. Updated .
Description
The direct-acting brake is applied by a spring and released by an electromagnet; the friction lining is wear-resistant and the hub is splined. Braking torque is specified from 1.5 to 1000 ft-lb (approximately 2 to 1356 N·m). Electrically the motors comply with NEMA Design B, C and D, and in the adjustable version for an inverter the constant-torque range is 1000:1 in open loop and 2000:1 in closed loop. Speeds are 3600, 1800, 1200 and 900 rpm, voltage up to 600 V at 60 Hz, up to 133 Hz from an inverter. Frame sizes are NEMA 56–449, protection is ODP, TEFC or TENV, insulation is class B, F, H with vacuum impregnation. The core is made of M-19, M-36 or M-45 electrical steel, and the frame is cast iron or cast aluminum. Options include encoders, resolvers, and temperature and vibration sensors.
How to choose
First match the required power within 2–350 hp with a braking torque for the inertia of your mechanism. If speed must be adjusted, take the inverter version with a range of 1000:1 or 2000:1. A motor that works only from a frequency converter up to 350 hp is made as a separate SS-100 series. When a brake is needed on an existing motor, look for separate electromagnetic brakes.
Request a price and lead time
Induction motors with built-in electromagnetic brake 2–350 hp, braking torque up to 1000 ft-lb. We reply within one business day.
Or email office@usk.ua or call +38 (044) 339-50-20.
FAQ
How does the brake in such a motor work?
A spring applies the brake and an electromagnet releases it, so when power is lost the shaft stops. It is a direct-acting disc brake with a splined hub.
What braking torque can be obtained?
From 1.5 to 1000 ft-lb, approximately 2 to 1356 N·m. The value is chosen for the inertial mass of the mechanism.
Can the motor be controlled through a VFD?
Yes, the adjustable version has a range of 1000:1 in open loop and 2000:1 in closed loop at constant torque, frequency up to 133 Hz.
Which frame sizes and protection types are available?
NEMA 56–449 frame sizes, ODP, TEFC or TENV protection, continuous or intermittent duty.
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Need a price, lead time or replacement?
Send us a request and we will confirm the configuration, lead time and delivery terms. We reply by email.