Examples of installation & Application

Initial Torque

Although armatures, rotors, and brake faces are machined or even lapped as flat as possible at manufacture, peaks and valleys remain on the surfaces. When a new clutch or brake engages, the contact area is initially confined to the peaks on the mating surfaces. This smaller contact area means torque can be as much as 50%~70% less than the unit’s static torque rating.

To get the full torque, users need to burnish mating surfaces. Burnishing cycles the unit, letting those initial peaks wear down so there is more surface contact between the mating faces. These cycles depending on the amount of torque required, should be lower in inertia, speed, or both, than the end application. Normal operations wear down contact surfaces as burnishing does. Every time a clutch or brake engages during rotation, a certain amount of energy is transferred as heat, please also note that the heat can not be higher than 80℃.


 Dry clutch and driver can be used to drive and disengage machines, to transfer speeds and directions and for other application including.
 
 Packing and wrapping systems: packing machines, strapping machines, wrapping machinery.
   
Textile machinery: fiber twister, treatment machines, weaving machines.
   
Metal finishing systems: extruders, wire stretchers, presses, welders, steel wire retractors, cutters, pipe makers, wire winding machines.
   
Machine tool systems: lathes, millers, steel extruders, CNC lathes, specialized machinery.
   
Transportation equipment: hoists, feeders, conveyors rollers, winders.
   
Paper-making systems: bag-making machines, box-making machines, slitters, book-making machinery, cutters, copy paper machines.
   
Printing systems: conveyors and in-feeders.
   
Wood-working systems: saws, wood-working machines, laminators.
   
Office equipment: electronic copy mahines, calculators, fax machines, coin counters, printers.
   
Testing system: lab machines, durability testers, measuring systems.
   
Food processing systems: meat cutting machines, cookie making machines, canning machines, noodle making machines.
   
Others: speed reducers, electroplating machinery, physics and chemistry machines, paper-machines, pulp processing machines.
 
 Applications

 
 Basic Control Circuit
When the coils in the clutch and driver are energized with direct current a certain level of energy is stored in the coils. When the current is cut the accumulated energy will create a negative voltage. between the terminals of the coils. This negative voltage may be 1000V or more depending on the speed and timing of the cut-off. This could result in damage to the coil or the switch contacts, and protective circuits are built in to prevent this possibility.
 
Resistors and diodes

These help to lower power consumption and resistance capacity. They may cause slight delays when the armature is released, a point which should be kept in mind in high-frequency applications.

   
Resistors and capacitors

Capacitors with high voltage resistance are needed to speed the release of the armature.

   
Surge buffer

Offers firm control of surge currents to avoid delays.

   
 Diodes

Offer good control of surges but may result in delayed release of armature, and can cause conflicts between the clutch and the brake. Not suitable for high frequency applications.

 

 Basic Control Circuit 2

Magnetic relay contacts are on the DC side, so standard load capacity should be in the range of 10A

The basic control circuit for clutch and brake consists of a transformer, rectifier, surge protector and switch. The circuit in figure 18 is widely used in clutch designs. Magnetic relays a and b are for switches. To ensure that the clutch and driver remain off it will be necessary to add another control switch.