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Clutch Brakes Provide Precise Positioning

Posidyne clutch brakes serve in harsh environments.

Posidyne clutch brakes provide high cycle indexing for severe duty applications in mills, mines and factories.
Posidyne clutch brakes provide high cycle indexing for severe duty applications in mills, mines and factories.
Force Control

Force Control Industries (Fairfield, OH) announced its Fan Cooled Posidyne clutch brakes which allow rapid and precise stopping, starting, speed change and positioning even in harsh environments. Oil Shear technology transmits torque through lubricated surfaces so there is no wear and no heat build-up so the clutch brakes require no maintenance or adjustment. 

Fan cooling provides as much as 4.5 times the cooling capacity of non-fan models. The addition of a fan is recommended for applications where the input shaft rotates at high speed (1800 or 1200 rpm). 

Elevated ambient temperatures will impact the radiation cooling effect. If additional cooling is required, options available include liquid cooling, external cooling packages and forced lube cooling.

Fan Cooled Posidyne clutch brakes allow cycle rates of up to 300 cycles per minute. They are ideal for applications with frequent start-stop cycles. 

Faster production rates and significantly longer service life yields increased uptime, productivity and ROI. Posidyne clutch brakes are field proven in diverse applications such as packaging lines, food and chemical processing facilities, lumber mills, shingle plants, fiberglass insulation production, metalworking and more.

The Posidyne clutch brakes are designed with low inertia cycling components which requires less motor horsepower to accelerate the load and less torque to stop the load. 

Posidyne clutch brakes feature a multiple disc design that produces high torque from a small package. Re-circulating the fluid dissipates the heat of engagement, which is a common cause of downtime with other clutch brake assemblies.

An actuation system allows torque in the clutch and brake to be precisely controlled. Manifold mounted control valves reduce response times by eliminating hoses and fittings and are recommended for high cycle applications. By reducing the high-starting inrush currents and the associated power factor imbalance in the motor these clutch brakes can also reduce energy costs. 

The Posidyne clutch brake can be actuated by air or hydraulic pressure for use in a plant or outside remote applications. The hydraulic actuation package includes a hydraulic pump, solenoid valve, regulators and a filter. A heat-exchanger can be added for additional cooling.

The Posidyne® is inherently explosion proof with the addition of an explosion proof actuation valve, or locating the valve in an explosion proof cabinet. Multiple sizes are available to suit particular applications from ½ to 350 HP (99 Lb. In. to 79,000 Lb. In.) with cooling options, control logic and mounting arrangements to simplify and speed installation.

Oil Shear Technology 

Oil Shear Technology is the function of a boundary layer of transmission fluid in shear between the friction discs and drive plates. As the parts come together, the fluid in shear will transmit torque between the two parts, as well as absorb heat. This eliminates direct contact of the friction discs and drive plates during high-speed slip. Heat from the friction surface is dissipated as the fluid circulates to the housing. 

Heat dissipation is a major component when selecting a clutch brake. The Posidyne clutch brake basic unit dissipates heat through a unique internal design pumping system which causes the transmission fluid to be drawn into the center of the hub, flows through the friction stack and, by centrifugal force, is pulled out of the stack to the housing.

Cooling occurs as the fluid flows down the housing walls. Additional heat can be dissipated by adding internal water-cooling or pulling the fluid out to external-oil-to water or oil-to-air heat exchangers. This also allows for the use of an oil filter extending the life of the fluid. These cooling options allow the same compact size Posidyne clutch brake to be used on high inertia loads or in extremely high or low temperatures.

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