Sunrise Group High precision low mechanical friction POC magnetic powder clutch
Fig. 1 Structural diagrams of POC series powder clutches (representative examples)
Magnetic powder clutch Structure and principle of operation
● The magnetic powder clutch structure is shown in Fig. 1. The drive member linked to the input side and the driven member linked to the output side are disposed concentrically across a powder gap.
● The powder gap is filled with powder (magnetic iron powder), and the coil for passing a magnetic flux to the powder is built in the stator, and it is designed to feed direct current from outside through the lead wire.
● While the drive member is rotating, when a current flows in the coil, a magnetic flux is generated as indicated by broken line in the drawing, and the powder is linked like a chain along the magnetic flux, and its coupling force the driven member is driven, and the torque is transmitted to the output side.
● When the exciting current is cut off, the magnetic flux disappears, and the coupling force of the powder is eliminated, thereby cutting of transmission of powder to the driven member.
magnetic powder clutch Feature
Specification
|
Magnetic powder clutch datasheet |
|||||||
|
Model |
POC-006 |
POC-015 |
POC-025 |
POC-050 |
POC-100 |
POC-200 |
|
|
Rated torque [kgf-m](N-m) |
0.6(6) |
1.2(12) |
2.5(25) |
5(50) |
10(100) |
20(200) |
|
|
Capacity |
Current (A) |
0.74 |
0.9 |
1.1 |
1.4 |
2.0 |
2.5 |
|
Power (W) |
17.8 |
21.6 |
26.4 |
33.6 |
48 |
60 |
|
|
No. of hour set(S) |
0.04 |
0.04 |
0.06 |
0.09 |
0.14 |
0.3 |
|
|
Moment of inertia(kgcm2)
|
Input side |
2.70*10-3 |
6.3*10-3 |
1.2*10-2 |
2.6*10-2 |
7*10-2 |
2.1*10-1 |
|
Output side |
5.0*10-4 |
1.1*10-3 |
2.3*10-3 |
5.8*10-3 |
1.5*10-2 |
5.0*10-2 |
|
|
Weight(kg) |
2.7 |
5.2 |
9 |
14.5 |
37 |
53 |
|
|
Maximum speed (r/min) |
1800 |
1000 |
|||||
|
Weight of powder (g) |
14 |
25 |
39 |
60 |
117 |
255 |
|
| Magnetic powder clutch dimension(unit:mm) | |||||||
|
Model |
POC-006 |
POC-015 |
POC-025 |
POC-050 |
POC-100 |
POC-200 |
|
|
Exterior |
L1 |
86 |
103 |
119 |
150 |
166 |
198 |
|
L2 |
21 |
32 |
36 |
48 |
48 |
59 |
|
|
L3 |
58 |
58 |
66 |
82 |
100 |
118 |
|
|
L4 |
7 |
13 |
17 |
20 |
18 |
21 |
|
|
L5 |
1 |
2 |
2 |
3 |
4 |
1 |
|
|
L6 |
64 |
76 |
91 |
116 |
130 |
152 |
|
|
L7 |
21 |
25 |
26 |
31 |
32 |
45 |
|
|
D1 |
128 |
160 |
185 |
230 |
275 |
342 |
|
|
D2 |
82 |
96 |
114 |
150 |
176 |
200 |
|
|
D3(g7) |
70 |
80 |
90 |
110 |
125 |
160 |
|
|
D4 |
60 |
68 |
80 |
95 |
110 |
140 |
|
|
D5 |
60 |
68 |
80 |
95 |
110 |
140 |
|
|
D6 |
42 |
48 |
55 |
68 |
80 |
110 |
|
|
P |
M6*10L |
M6*10L |
M6*10L |
M8*12L |
M10*18L |
M10*18L |
|
|
Q |
M4*8L |
M6*8L |
M6*8L |
M8*12L |
M10*18L |
M10*18L |
|
|
d(H7) |
15 |
18 |
20 |
30 |
35 |
45 |
|
|
w(F8) |
4 |
5 |
6 |
8 |
10 |
14 |
|
|
T |
16.5 |
20 |
22 |
33 |
38.5 |
49 |
|
Magnetic Powder Clutch Mounting
● Provide the fin rotation stop screw with a clearance in the axial direction as well as on the side hole of the fin detent plate (arranged by customer) (see the enlarged view).
Tightening the fin applies excessive force to the bearings inside the magnetic powder clutch and may quickly damage the bearings.
● Be careful of the length of the fin rotation stop screw. If the fin rotation stop screw is too long, the tip of the screw may interfere with the bracket (rotating part).
● Always use an elastic coupling to connect the input side and shaft, and set the concentricity, perpendicularity, etc. of the shafts at this time within the allowable value of the elastic coupling. Provide the elastic coupling with a thrust play.
Installation without thrust play will cause a bearing failure (noise, locki ing, etc.) inside the clutch.
● When using a pulley drive, observe the range of allowable axial load and do not overstretch the belt. Failure to do so may cause a bearing failure (noise, locking, etc.)
● Since the outer periphery rotates, be sure to cover the whole body wi ith a wire mesh or the like with good ventilation.
Magnetic powder clutch exciting current VS torque
Magnetic Powder Clutch Application
Application scenarios
Attention Of Operation For Magnetic Powder Clutch
● lf a shock is applied to the clutch during transportation, powder may be scattered inside the clutch. For this reason, before starting regular operation, perform running-in while following the procedure below to collect powder into the powder gap, if necessary.
● ln addition, if the powder is replaced, be sure to perform running-in.
Running-in procedure
● Fix the output shaft to prevent rotation. (lf it is difficult to fix the shaft, apply a heavy load to preventrotation of the output shaft.)
● After that, without flowing the exciting current, rotate the drive member at approximately 200 r/min for1 minute, and then set the exciting current to 1/4 to 1/2 of the rated value. While rotating the drive member, flow the exciting current for 5 seconds, and then stop flowing the current for 10 seconds. Repeat this cycle approximately 10 times.
End of running-in
● While the running-in is insufficient, the torque output may be low or the torque may fluctuate, but as the running-in becomes sufficient and the powder comes to work effectively, a stable torque corresponding to the exciting current is produced.
● After the running-in, start regular operation.
● Depending on the conditions of use, the drive member surface temperature may rise considerably. Use the product while keeping the surface temperature below 90℃. lf the surface temperature exceeds 90℃, relax the operation conditions, and prevent overheat of the clutch.
● The above-described surface temperature is a reference value.Be sure to use the clutch within the allowable heat dissipation.
● (Herein, the surface temperature is mentioned on the basis of the ambient temperature of 30°℃. The allowable ambient temperature range is 0 to 40℃.
CAUTION for magnetic powder clutch
