Sunrise’s powder clutch and powder brake units utilized electromagnetic powder to transmit torque. This offers the advantages of more streamlined and softer clutch operation and greater effectiveness during engagement of clutch friction surfaces.

 

Sunrise produces a diverse range for clutches and is widely experienced in their application.The company has accumulated extensive technology and know-how and can meet your any needs.All of the products available are used to control winding achiness used in producing paper, fiber, wire and cable and plastic items, and are indispensable parts of any production line.These units can also be used in low-impact start and drive applications and to prevent overload during operations as torque.

 

1. Easy, wide-range controls

The closed correlation between magnetic current and torque makes it easy to control transmitted torque over a very broad range.

 

2. Enables seamless, continuous operation

The use of magnetic powder makes it possible to maintain continuous operation with no effect on turning speeds, with stable torque levels over long periods.

 

3.Steady torque

 

The word surfaces and the curved shape contribute to proper operation of the magnetic powder, and a steady level of torque is available even when powder is repeatedly turned on and off.

 

4. No Chirping

The design avoids the development of slick spots on friction surfaces which can cause squeaks and chirping, resulting in ultra-quiet operation.

 

5.Extra heat capacity

This design avoids the development of slick spots on friction surfaces which can cause squeaks and chirping, resulting in ultra-quiet operation.

 

6. Smooth engagement and transmission

The static and dynamic friction rates for this model are virtually identical, which means very little vibration when contact is made. Acceleration and speed reduction to meet torque demands are also smoothly accomplished.

 

Powder clutch | powder brakeMotion characteristics

 

  

    

This section describes desired control of start-up times as well as the actions necessary when performing repeated high frequency operations.

 

Figure 3 depicts how the powder clutch functions during engagement and release. When voltage is delivered to the coil, the energizing current changes and exhibits numerical increases in accordance with the time factor (T=L/R). This time factor is determined by the basic resistance R of the coil and the induction index L. The increase in torque is only slightly slower than the rise in magnetic current and has nothing to do with the slip between the driver and driven sides; it will continue to rise until it reaches a set level. The torque also causes the load level to rise steadily.

In other words, although the drive and driven sides are not directly connected, the desired level of torque can still be achieved. This feature is connected to the large heat capacity of the clutch and offers several advantages where low-impact starts and stops or high-speed starts and stops are concerned. This feature is helpful when emergency connection and drive are needed. Low resistance can be added into the coil to reduce the time factor; and when toque start-up causes twice to three times the rated voltage is applied, the coil time factor T may rise to 4-5T, which will cause torque to build up fully. On the other hand, when the magnetism is cut off and torque is gone, about one T of time will be needed. Consult the various specification charts for time factors for coils.

 

¡ôAllowable sustained slip rates


Although powder clutches and brakes can be used with sustained slip, the heat generated by slip will be confined to a rise in the temperature of the powder in the first clutch and brake. Thus the allowable continuous slip rate for each type of machine must be determined, and the machine must be maintained within the set range during operation.

When frictional heat becomes excessive the temperature of the affected parts will rise significantly. To prevent it from happening each machine must have its particular allowable contact workload determined, and this range must be observed during operation.

 

¡ôNo-load torque

Even when the magnetic current is completely shut off, the residual magnetism in the powder, lubricating oil in the bearings, linings and other sources of friction can cause mechanical loss, a feature called no-load torque.

No-load torque varies from machine to machine, and if the acceleration rate becomes excessive, mechanical losses in the accelerating portion may keep the torque from reaching proper levels.

 

¡ôTest run

During shipment the powder in a clutch or brake may be lost or displaced, thus it is necessary to carry out test run of the parts before engaging in full use.

 

¡ôUnder forced-air cooling

Under forced-air cooling

Their used for compressed air cooling should be free from water and oil, and a filter system with complete oil removal should be installed to remove vapors and deliver dry, clean air. (If moist air is used with a compressed air blower it will make the machinery damp, and decrease the efficiency of the system).

 

If the blower system uses hoses that are long or complex, ensure that a sufficient flow of air is being delivered.

 

¡ôHeat blocks and heat cooling coils

Even when blowers are installed, they may lose their capacity and ability to dissipate heat, causing a drop in the operating efficiency of machines. A generous amount of space should be reserved around blower fans, especially in more adverse environments. The blades of blower fans can pick up impurities from the air and should be thoroughly cleaned on a regular basis.

 

A heat sensor should be fitted to the outside of the unit with a thermostatic switch and a warning system, which must be regularly checked.

 

¡ôOptions

Rated torque levels should not be exceeded even if they lie within the range of acceptable operating efficiencies.

 

When the tension control range is too broad, several different clutches may be installed and used interchangeably. In such cases the clutches must be isolated from each other to ensure that clutches that are not engaged will not run freely.

 

¡ôAbnormal torque on start-up

Some types of operation (*) may cause torque levels to exceed specifications during start-up (this will not adversely affect normal operations unless the powder in the units is damp). This possibility can be minimized by carrying out a proper test run on installation and applying low levels of magnetism even when the system is stopped.(* applying input after or at the same time the unit is magnetized.)

 

Single Shaft Magnetic Powder Brakes for Printing Machine PFB series























PFB Attention for using magnetic powder brake:
















1. Install it with correct mounting method (make high-speed rotation side as the input side) to use the magnetic powder clutch. If the mechanical structure of output and input shafts have to be installation reversely, make sure to use the under 1000R/MIN. If the output shaft and input shaft be installed reversely, which will make the machine idle for a long time,  the magnetic powder clutch will greatly shorten the life by mixing magnetic powder. 









2. Note the moisture. If the magnetic is damp, then performance will become unstable, so be careful do not to let the oil or water get into the housing. Especially when installed in the gear box, oil penetrated the internal branch of the housing through the shaft, so please seal it with film completely.









3. Note the surface temperature. Caused by continuous operation, the maximum temperature of the surface is below 90 degree when running more, than the value and durability will be greatly reduced. Make sure to limit the temperature will not above90 degree, make sure to keep the use of sliding within allowed work range.













Function: Printing Machine Magnetic Clutch Powder Brake for tension controller PFB series






Brand: Sunrise Group/ None






Item No.: PFB-025, PFB-050, PFB-100, PFB-200






Material: Steel ...






Usage: Maintain, braking, buffer start, tension control, torque limit etc.






Rated torque [kgf-m] (N-m): 2.5(25)~20(200)






Capacity DC24V (75¡æ):






Current (A): 1.24~2.70; Powder (W): 29.8~64.8; No. of hour set (S): 0.12~0.37






Moment of inertia (Kg cm2): 3.80¡Á10^(-2)~9.15¡Á10^(-2)






Area of heat release (cm2): 350






Max. speed (r/min): 1800






Weight (kg): 10~59






Price: US $200/pc






MOQ: 1pc






Payment term: T/T, Western union






Delivery term: EXW






Validity: 10 days






Lead time: 5-7 days






Website: sunrisescn.com

Features of Powder Clutch and Brake





The magnetizing current has a liner relartionship with torque


As is shown in Chart 3, the transmission torque has a linear relationship with the magnetizing current. The size of the torque can get controlled within larger range. Under normal circumstance, the magnetizing current has a liner relationship with transitive torque within range of 5%~100% rated torque.





Stable slip torque


The slip totational speed between driven rotor and active rotor do not affect the transitive torque when the magnetizing current retain unchanged, as shown in Chart 4, which means, the static friction torque and the dynamic friction torque have no difference. Therefore, the torque can retain constant stably. The features are applied to tension control, users can control the tension of the roll material effectively as long as adjust the magnetizing current accurately.





Prevention heat phenomenon from slip




The friction part will generate hear inevitably or even destryed when it keep continuous sliding. But this device has a complete cooling set, it will generate a lot of heat after long time running and it has a long service life.

Electromagnetic Clutches







What is Electromagnetic Clutch?

Electromagnetic clutches, also referred to as ¡®electromechanical’, actuate electrically but transmit torque mechanically. The basic design of an electromechanical clutch consists of an electromagnetic coil within a metal housing (stator), a rotor connecting to the input source, and an armature that connects to the output source. To engage an electromechanical clutch, the coil is energized creating a magnetic field which pulls the armature friction plate to the rotor friction plate, establishing a frictional mechanical connection. The force between the friction surfaces transmits torque from the input rotor to the output armature. A variation to the friction disc design is a toothed design for timing / position control and for higher torque applications. With no magnetic field present, the armature is pulled back into its default position by a recessed flat spring. This action creates a small air gap between rotor and armature plates, effectively disengaging the output armature and ceasing torque transmission.







What are the Electromagnetic clutch of Sunrise Group?



Over the years, Sunrise became known as electromagnetic versus electro mechanical, referring more about their actuation method versus physical operation. Since the clutches started becoming popular over 60 years ago, the variety of applications and clutch designs has increased dramatically, but the basic operation remains the same.







This article mainly deals with these types of clutches.

1. Flange single-plate electromagnetic clutch (FCD)

2. Inner bearing type electromagnetic clutch (MCS)

3. Electromagnetic Clutch & Brake Units£¨SMP£©

This clutch & brake device is used where an output needs to be engaged and disengaged, as well as halted. Our combo units provide up to 320 Nm of transmittable torque, and are available in six different models including clutch & brake, double clutch, or double brake configurations.





Sunrise Group offers several electronic clutch and electromagnetic brake options to meet your application requirements. Request a quote today or contact us to request additional information.