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Parker: Stepper Motor (OS21B Series) Low cost stepper motors 23-frame A-Winding for use with 75VDC or less bus voltage drives like the OEM750 and E-DC B-Winding for use with the higher bus voltage drives like the E-AC, GT, and ZETA
Model No.: OS21B-DFFLY, OS21B-DNFLY, OS21B-DNL10, OS21B-SFFLY, OS21B-SFL10, OS21B-SNFLY, OS21B-SNL10
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Frame
Size
(mm)
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Parameters
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Static Torque
(oz-in)
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Rotor inertia
oz-in2
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Phase Inductance
Series/ Parallel
(mH)
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Detent Torque
oz-in
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Radial Play
(Per 0.5 lb load)
(in)
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OEM750
Series/ Parallel
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Motor Weight
(lb)
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Size 23
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OS2HA
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49.1
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0.39
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1.7/NA
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2.5
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0.0008
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2.65
(1.9) / 5.3 (3.7)
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1
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OS21A
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114
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0.66
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1.8/NA
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4.0
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0.0008
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3.3
(2.3) / 6.6 (4.7)
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1.5
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OS22A
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186
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1.39
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2.8/NA
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7.0
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0.0008
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3.8
(2.7) / 7.5 (5.3)
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2.5
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OS2HB
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61.35
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0.39
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8.6/2.2
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2.5
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0.0008
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NA /
NA
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1
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OS21B
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126.5
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0.66
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12/3
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4.0
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0.0008
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NA /
NA
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1.5
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OS22B
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238
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1.39
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16.6/4.2
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7.0
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0.0008
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NA /
NA
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2.5
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Parker Sizing and Selection
Tools
| Part # | Description |
| 1 | OS21B-DFFLY | MOTOR,OS2 (57-51)170V,CE,DBL |
| 2 | OS21B-DNFLY | MOTOR,OS2 (57-51)170V,CE,DBL |
| 3 | OS21B-DNL10 | MOTOR,OS57-51,DBL,10FT,170V |
| 4 | OS21B-SFFLY | MTR,OS2(57-51)170V,CE,SNGL,KEY |
| 5 | OS21B-SFL10 | MOTOR,OS57-51,SGL,10FT,170V |
| 6 | OS21B-SNFLY | MOTOR, OS2,(57-51)170V,CE,SGL |
| 7 | OS21B-SNL10 | MOTOR,OS57-51,SGL,10FT,170V |
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