New
cts
u
d
o
r
P
2-Phase Stepping Motors
PK Series
Motor Frame Size: □ 1.97 inch (□ 50 mm)
Features
· Compact size with high torque
· Available in two stack lengths: 2.03 inch (51.5 mm) & 3.19 inch (81 mm)
Specifications
Basic Step Angle: 1.8/step
Model
Single Shaft
Double Shaft
Connection Type
PK256-02A
PK256-02B
PK258-02A
PK258-02B
Bipolar (Series)
Unipolar
Bipolar (Series)
Unipolar
Holding Torque
oz-in
119
85
220
170
Current per Phase
N·m
0.84
0.6
1.56
1.2
A/phase
1.4
2
1.4
2
Speed-Torque Characteristics
PK256-02B Bipolar (Series)
0.8
140
Torque [N·m]
Torque [oz-in]
Torque [N·m]
0.4
60
Pullout Torque
40
0.4
fs
0
500
0
1000
Speed [r/min]
2
1500
23010-7
6
2.3
42010-7
6
Pullout Torque
60
40
fs
500
1000
Speed [r/min]
2
0
Full Step
4
Pulse Speed [kHz]
1500
4
Pulse Speed [kHz]
2000
6
Full Step
PK258-02B Unipolar
Bipolar Constant Current Driver
With Damper D6CL-6.3F: JL = 0.77 oz-in2 (140⫻10⫺7 kg.m2)
Step Angle: 1.8˚/step
250
1.5
24 VDC
48 VDC
Bipolar Series (1.4 A/Phase)
Power Input: 24 VDC Unipolar Constant Current Driver
With Damper D6CL-6.3F: JL = 0.77 oz-in2 (140⫻10⫺7 kg.m2)
Step Angle: 1.8˚/step
Unipolar (2.0 A/Phase)
200
Torque [N·m]
Torque [oz-in]
200
150
Pullout Torque
100
0.5
0.6
0.3
50
0
0.9
fs
0
fs
400
600
Speed [r/min]
200
0
1
800
0
1000
150
100
Pullout Torque
50
fs
0
500
0
Full Step
2
Pulse Speed [kHz]
Torque [oz-in]
1.2
1.5
Torque [N·m]
1.26
80
0
0
2000
PK258-02B Bipolar (Series)
1.0
kg·m
Lead
Wires
20
20
2.0
oz-in
2
0.2
0.2
0
mH/phase
5.6
1.4
11.5
2.87
2
Unipolar (2.0 A/Phase)
0.6
80
Ω/phase
3
1.5
4.8
2.4
Rotor Inertia
J
100
100
0.6
VDC
4.2
3
6.7
4.8
Inductance
Power Input: 24 VDC Unipolar Constant Current Driver
With Damper D6CL-6.3F: JL = 0.77 oz-in2 (140⫻10⫺7 kg.m2)
Step Angle: 1.8˚/step
0.8
24 VDC
48 VDC
Bipolar Series (1.4 A/Phase)
120
Resistance
per Phase
PK256-02B Unipolar
Bipolar Constant Current Driver
With Damper D6CL-6.3F: JL = 0.77 oz-in2 (140⫻10⫺7 kg.m2)
Step Angle: 1.8˚/step
Torque [oz-in]
1.0
Voltage
1000
Speed [r/min]
2
4
Pulse Speed [kHz]
1500
2000
6
Full Step
Connection Diagrams
Motor Wiring Diagrams
Wire Connection
6 Lead
Unipolar Connection
6 Lead Motor
6 Lead
Bipolar (Series) Connection
A Phase
A Phase
Black
Black
Yellow
Yellow
N.C.
Green
Green
Green
Red
White
B Phase
Blue
B Phase
Black
Red
White
Blue
Red N.C. Blue
Notes on the Speed-Torque Characteristics Diagrams
The speed-torque characteristics featured in this catalog are as measured
with a constant-current driver or a constant-voltage driver. The actual characteristics will vary depending on the driver used. Please use these diagrams only for reference purposes when selecting a motor. You should
also conduct a thorough evaluation with the actual driver to be used.
)
L1
L2
Weight
inch (mm)
inch (mm)
lb. (kg)
2.03 (51.5)
2.66 (67.5)
3.19 (81)
3.82 (97)
DXF
1.17 (0.53)
B293
1.96 (0.89)
B334
·These dimensions are for double shaft models. For single shaft models,
ignore the shaded area.
0.31 Max.
(8 Max.)
0
0
(␾36⫺0.039
)
0.591⫾0.010(15⫾0.25)
0.31
(8 Max.)
PK256-02A
PK256-02B
PK258-02A
PK258-02B
1.61⫾0.014
(41⫾0.35)
0
1.97(50)
1.61⫾0.014
(41⫾0.35)
␾0.177(␾4.5)⫺4 Holes
(
0.06
(1.5)
0
␾6.35⫺0.012
0.79⫾0.04
(20⫾1)
Model
␾1.4173⫺0.0015
)
0.228⫾0.006
(5.8⫾0.15)
0.40
(10.1)
(
0
0
␾6.35⫺0.012
␾0.2500⫺0.0005[1/4"]
0.591⫾0.010
(15⫾0.25)
L2
L1
0.20
(5)
0.228⫾0.006
(5.8⫾0.15)
0.63⫾0.04
(16⫾1)
Scale 1/4, Unit = inch (mm)
␾0.2500⫺0.0005[1/4"]
Dimensions
1.22 Max.
(31 Max.)
6 Motor Leads 12 inch (300 mm) Length
UL Style 3265, AWG 24
General Specifications
Item
Specifications
Dielectric Strength
100 MΩ minimum under normal temperature
and humidity, when measured by a 500 VDC megger
between the motor coils and the motor casing.
Sufficient to withstand 1.0 kV, 60 Hz applied
between the motor coils and casing
for one minute, under normal ambient
temperature and humidity.
14F (-10C)~122F (+50C)
Ambient Temperature
Operating
Ambient Humidity
Environment
Atmosphere
Temperature Rise
Overhung Load
Distance from Shaft End [inch (mm)]
Model
0
PK256-02□ 11.9
PK258-02□ 54
Thrust Load
0.2 (5) 0.39 (10) 0.59 (15) 0.79 (20)
14.8
67
19.6
89
28
130
The permissible thrust
load [lb. (N)] shall be no greater
than the motor mass.
· Enter the shaft type A or B in the box(□) within the model name.
85% or less
No corrosive gases, dust, water or oil.
Temperature rise of the coil measured by the
Change Resistance Method is 144F (80C) or less.
(at standstill, two phases energized)
3 arc min. (0.05)
Step Accuracy ✽1
Shaft Runout
Unit = Upper values: lb./Lower values: N
Class B [266F (130C)]
Insulation Class
Insulation Resistance
Permissible Overhung Load
and Permissible Thrust Load
0.002 inch (0.05 mm) T.I.R. at top of output shaft ✽4
Shaft Radial Play ✽2
0.001 inch (0.025 mm) max. of 1.12 lb. (5 N)
Shaft Axial Play ✽3
0.003 inch (0.075 mm) max. of 2.2 lb. (10 N)
Concentricity
Perpendicularity
0.003 inch (0.075 mm) T.I.R. ✽4
0.003 inch (0.075 mm) T.I.R. ✽4
✽1 This value is for full step under no load (The value changes with size of the load).
✽2 Radial Play: Displacement in shaft position in the radial direction, when a 1.12 lb.
(5 N) load is applied in the vertical direction to the tip of the motor's shaft.
✽3 Axial Play: Displacement in shaft position in the axial direction, when a 2.2 lb.
(10 N) load is applied to the motor's shaft in the axial direction.
✽4 T.I.R. (Total Indicator Reading): Total dial gauge reading when the measured
section is rotated one revolution centered on a reference axis.
Note:
· Do not measure insulation resistance or perform the dielectric strength test while the
motor and driver are connected.
This product is manufactured at a plant certified with the
international standards ISO 9001(for quality assurance) and
ISO 14001(for systems of environmental management).
Specifications are subject to change without notice.
This catalog was published in April, 2004.
ORIENTAL MOTOR U.S.A. CORP.
Western Sales and
Customer Service Center
Midwest Sales and
Customer Service Center
Eastern Sales and
Customer Service Center
Tel: (310) 784-8200 Fax: (310) 325-1076
Tel: (847) 285-5100 Fax: (847) 843-4121
Tel: (781) 848-2426 Fax: (781) 848-2617
Denver
Chicago
Atlanta
Tel: (303) 202-5111
Tel: (847) 285-5100
Tel: (770) 716-2800
Los Angeles
Toronto
Boston
Tel: (310) 784-8200
Tel: (905) 502-5333
Tel: (781) 848-2426
San Jose
New York
Tel: (408) 358-6900
Tel: (973) 359-1100
Technical Support
Tel: (800) 468-3982 / 7:30 a.m. to 5:00 p.m., P.S.T. (M–F)
E-mail: techsupport@orientalmotor.com
Copyright ©2004 ORIENTAL MOTOR U.S.A. CORP.
Obtain Specifications, Online Training
and Purchase Products at:
www.orientalmotor.com
Printed in U.S.A. 04R 3K 29314G