Conversion Tables
Wiring Effect on Motor Electrical Ratings
Stepper motor manufacturers may rate their motors 3 different
ways. 1) unipolar (or bipolar center tap to end), 2) Bipolar series and, 3)
bipolar parallel. Most ratings for 6 lead motors are unipolar. Ratings for 4
lead motors are bipolar, while ratings for 8 lead motors can be any of the three.
MicroKinetics motors are all rated for the unipolar method for consistency.
You should use the chart below to adjust for the driver type and wiring you
choose for your application. Because all MicroKinetics drivers are constant
current, the main consideration is the current. Driving a 6 lead motor “end
to end” will require only 70% of the rated current (when compared to the
standard method of driving the motor “center tap to end”).
| Rated Drive Scheme |
Desired Drive Scheme
| |
Rating
|
Unipolar multiplier
|
Bipolar series multiplier
|
Bipolar parellel multiplier
|
|
Unipolar or Bipolar
Center Tap to End
|
|
volts
|
|
amps
|
|
ohms
|
|
mH
|
|
holding torque
|
|
|
|
|
|
Bipolar Series
|
|
volts
|
|
amps
|
|
ohms
|
|
mH
|
|
holding torque
|
|
|
|
|
|
Bipolar parallel
|
|
volts
|
|
amps
|
|
ohms
|
|
mH
|
|
holding torque
|
|
|
|
|
|
Torque
Multiply Number of
|
dy-cm
|
g-cm
|
N-cm
|
kg-cm
|
N-m
|
oz-in
|
lb-in
|
lb-ft
|
|
| 1 |
980.7 |
105 |
9.807x105 |
107 |
7.062x104 |
1.130x106 |
1.356x107 |
dy-cm
|
| 1.020x10-3 |
1 |
1.020x102 |
103 |
1.020x104 |
72.01 |
1.152x103 |
1.383x104 |
g-cm
|
| 10-5 |
0.9807 |
1 |
9.807 |
100 |
0.7062 |
11.3 |
135.6 |
N-cm
|
| 1.020x10-6 |
10-3 |
0.102 |
1 |
10.20 |
7.201x10-2 |
1.152 |
13.83 |
kg-cm
|
| 10-7 |
9.807x10-5 |
10-2 |
9.807x10-2 |
1 |
7.062x10-3 |
0.113 |
1.356 |
N-m
|
| 1.416x10-5 |
1.389x10-2 |
1.416 |
13.89 |
141.6 |
1 |
16 |
192 |
oz-in
|
| 8.850x10-7 |
8.681x10-4 |
8.850x10-2 |
0.8679 |
8.85 |
6.250x10-2 |
1 |
12 |
lb-in
|
| 7.375x10-8 |
7.234x1--5 |
7.375x10-3 |
7.234x10-2 |
0.7375 |
5.208x10-3 |
8.333x10-2 |
1 |
lb-ft
|
|
To Obtain
|
To convert a torque value form oz-in to N-cm multiply by
0.7062
Inertia
Multiply Number of
|
gcm2
|
kgcm2
|
kgm2
|
oz-in-s2
|
oz-in2
|
|
|
1
|
103
|
107
|
7.062x104
|
182.9
|
gcm2 |
|
10-3
|
1
|
100
|
70.62
|
0.1829
|
kgcm2 |
|
10-7
|
10-4
|
1
|
7.062x10-3
|
1.829x10-5
|
kgm2 |
|
1.416x10-5
|
1.416x10-2
|
141.6
|
1
|
2.590x10-3 |
oz-in-s2 |
|
5.467x10-3
|
5.467
|
5.467x10-4
|
386.09
|
1
|
oz-in2 |
|
To Obtain
|
To convert a rotor inertia value form gcm2
to oz-in2 multiply by 5.467x10-3
Force
Multiply Number of
| kgf |
N |
lbf |
|
| 1 |
0.102 |
0.4535 |
kgf |
| 9.807 |
1 |
4.448 |
N |
| 2.205 |
0.2248 |
1 |
lbf |
|
To Obtain
|
To convert kgf to lbf multiply by 2.205