Comparison Of Geared Servo Motors; Comparison Of Actual Reduction Ratios For Geared Servo Motors; Comparison Of Reducer Efficiency Of Geared Servo Motors - Mitsubishi Electric MELSERVO-J2S Series Transition Handbook

Part 8: Review on Replacement of Motor

2.4 Comparison of Geared Servo Motors

2.4.1 Comparison of actual reduction ratios for geared servo motors

Because the actual reduction ratio for some models is different when replacing HC-KFS or MFS_G1 with
HG-KR_G1, it is required that an electronic gear be set up.
For general industrial machines: HC-KFS, HC-MFS_G1 → HG-KR_G1
Output Reduction
(W)
50
100
200
400
750
Note. Actual reduction ratios with differences are shown with shading.

2.4.2 Comparison of reducer efficiency of geared servo motors

The gear reducer efficiency is different when HC-KFS or HC-MFS_G2 is replaced with HG-KR_G7, or HC-
SFS or HC-RFS_G2 is replaced with HG-SR_G7.
Model Reducer efficiency (Note)
HC-KFS_G2
60 to 80%
HC-MFS_G2
HC-SFS_G2
80 to 90%
HC-RFS_G2
Note. The reducer efficiency differs depending on the reduction ratio. Also, it changes depending on the operating conditions
such as the output torque, speed and rotation, temperature, etc. The numerical value in the table is a typical value in the
rated torque, rated speed and rotation and typical temperature, and not a guaranteed value.
POINT
Geared servo motors are not included in the HG-MR, HG-RR series.
ratio
HC-KFS and HC-MFS series (G1)
1/5
1/12 49/576
1/20 25/484
1/5
1/12 49/576
1/20 25/484
1/5
1/12 25/288
1/20 253/5000
1/5
1/12 25/288
1/20 253/5000
1/5
1/12 525/6048
1/20 625/12544
Substitute model
HG-KR_G7
HG-SR_G7
Actual reduction ratio
9/44
9/44
19/96
19/96
1/5
Reducer efficiency (Note)
50 W (reducer model 14A):
12% (reduction ratio 1/5), 22 to 34% (reduction ratio
1/11 to 1/45)
50 W (reducer model 11B)/100 W/400 W/750 W:
48 to 84%
77 to 92%
8 - 24
HG-KR series (G1)
9/44
49/576
25/484
9/44
49/576
25/484
19/96
961/11664
513/9984
19/96
961/11664
7/135
1/5
7/87
625/12544