Electromagnetic Clutches and Brakes, from Tiny to Huge
Founded in 1938, Ogura is the world’s largest maker of electromagnetic clutches and brakes – around 30 million a year, with more than 7,000 standard and custom designs from 14 ISO-certified plants. Norman G Clark supplies and supports Ogura in Australia.
Not sure what you need? Call (03) 9116 9200 and talk it through with our team.
Solutions
What Do You Need to Do?
Packaging & food. Packaging, food and beverage machines and conveyors.
Automation & robotics. Servo motors, robots, medical and factory automation.
Machine tools. Gearboxes, lathes and CNC machines.
Printing & converting. Printing, winding and unwinding film, foil and wire.
Lifting & doors. Hoists, elevators, cranes, gates and overhead doors.
Trucks & outdoor power. Service trucks, pumps, mowers and engine-driven equipment.
Start and Stop a Drive
Switch a load on and off, fast and often, from a motor or gearbox.
Hold a Load When Power Is Off
Stop or hold a motor, axis or hoist if power is lost.
Control Tension or Torque
Keep film, wire, paper or fabric at a steady tension.
Switch an Engine-Driven Load
Pumps, compressors, mower decks and implements on petrol and diesel engines.
The range
Ogura Products
Start and stop a drive
Electromagnetic Clutches
Single-face clutches for fast, frequent starts – the most common electromagnetic clutch.
0.25 – 2,000 Nm
Start and stop a drive
Electromagnetic Brakes
Power-on brakes that stop a load quickly and accurately, cycle after cycle.
0.25 – 200 Nm
Hold a load when power is off
Power-Off Holding Brakes
Spring-applied brakes that hold or stop a load when power is lost.
Micro to 800 Nm
Start and stop a drive
Multiple Disc Clutches
Very high torque in a small space – dry or running in oil.
18 – 12,000 Nm
Start and stop a drive
Multiple Disc Brakes
Multiple disc brakes for high stopping torque in gearboxes and machine tools.
18 – 12,000 Nm
Start and stop a drive
Tooth Clutches
The most torque for the size, with no slip and optional single-position engagement.
25 – 4,000 Nm
Control tension or torque
Magnetic Particle Clutches
Smooth, precisely controlled torque for tension control and soft starts.
0.5 – 8 Nm
Control tension or torque
Magnetic Particle Brakes
Particle brakes that hold a steady unwind tension on film, foil, paper and wire.
0.5 – 25 Nm
Control tension or torque
Permanent Magnet Hysteresis Units
Set-and-forget torque from permanent magnets – no power supply and no wear.
Up to 7 Nm
Switch an engine-driven load
Mobile, PTO and Engine Clutches
Electric clutches for pumps, compressors, mower decks and engine-driven equipment.
12 / 24 V · to 2,000 Nm
Switch an engine-driven load
Superchargers
Clutch-driven superchargers for instant low-speed torque.
Optional dual charging
How it works
How an Electromagnetic Clutch Works
Switched electrically, driven mechanically.
Power on: Engaged
Power to the coil turns it into an electromagnet. The magnetic flux crosses a small air gap and pulls the armature hard against the friction face, so the two turn together – electrically switched, but transmitting torque mechanically.
A brake works the same way, except the friction face is fixed, so the armature stops the shaft.
Power-Off Brakes Work the Other Way
In a spring-applied (power-off) brake, springs clamp the friction disc whenever there is no power – so the load is held if power fails. Power to the coil pulls the pressure plate back and releases the brake.
Why Ogura, through Norman G Clark
The World’s Largest Clutch and Brake Maker
Since 1938
More than 80 years designing and making clutches and brakes.
7,000+ Designs
Standard and custom designs, from micro clutches under 1 Nm to brakes for lifts and cranes.
Built to Last
Forged rotors, long-life grease, e-coating and epoxy-sealed coils on mobile clutches.
Local Support
Norman G Clark helps choose, size and replace Ogura units – call (03) 9116 9200.
Video
How an Electromagnetic Clutch Works
Literature
Catalogues and Data Sheets
Industrial
- Industrial clutches and brakes
AM, MIC, V, MMC, MZ and MD series · PDF, 3.8 MB - Power-off brakes
MB, RNB, MCNB-T, MNB, SNB and PMB holding brakes · PDF, 3.9 MB - Tension control
Magnetic particle and hysteresis clutches and brakes · PDF, 3.8 MB
Mobile and Engine
- Mobile clutches
Pump and compressor clutches, 12 and 24 V · PDF, 3.9 MB - PTO clutch-brakes
Electric PTO clutches for mowers and implements · PDF, 3.9 MB - General purpose clutches
Engine-mounted clutches, 5 – 40 hp · PDF, 4.3 MB - Smart clutch control
Soft start and overload protection module · PDF, 832 KB
Talk to Us About Your Application
Tell us about the job – the machine, the conditions and what it has to do – and we’ll help you choose the right Ogura product.