Arcus STM Series User manual

Stepper Motor Manual page 1 rev 1.08
Arcus Stepper Motor
Manual
STM Series

Stepper Motor Manual page 2 rev 1.08
COPYRIGHT © 2008 ARCUS, ALL RIGHTS RESERVED
First edition, May 2008
ARCUS TECHNOLOGY copyrights this document. You may not reproduce or translate
into any language in any form and means any part of this publication without the written
permission from ARCUS.
ARCUS makes no representations or warranties regarding the content of this document.
We reserve the right to revise this document any time without notice and obligation.
Revision History:
1.0–First Revision
1.01 –Updated introduction, updated motor specification chart format
1.02 –Updated motor spec
1.03 –Updated NEMA 11 spec
1.04 –Updated force specification
1.05 –Added encoder information
1.06 –Added NEMA 11 encoder specification
1.07 –Update
1.08 –Formatting update.

Stepper Motor Manual page 3 rev 1.08
Table of Contents
1. Introduction ...............................................................................................................4
2. Part Numbering .........................................................................................................5
3. Dimensions................................................................................................................6
STM-11-X-2.................................................................................................................6
STM-11-X-2-E100........................................................................................................6
STM-17-X-1.................................................................................................................7
STM-17-X-1-E100........................................................................................................7
STM-23-X-1.................................................................................................................8
STM-23-X-1-E100........................................................................................................8
STM-23-X-2.................................................................................................................9
4. Motor Specifications...............................................................................................10
5. Torque Curves.........................................................................................................11
STM-11-X-2...............................................................................................................11
STM-17-X-1...............................................................................................................12
STM-23-X-1...............................................................................................................13
6. Connectors ..............................................................................................................14
Connector Information...............................................................................................14
Wire Color Code –Motor Wires.................................................................................14
Wire Color Code –Encoder Wires.............................................................................15
7. Connector Extensions ............................................................................................16
NEMA 11/17/23 .........................................................................................................16

Stepper Motor Manual page 4 rev 1.08
1. Introduction
Arcus stepper motors are brushless, synchronous electric motors with the following
features:
-NEMA 11, NEMA 17, and NEMA 23 motor frame sizes
-Bi-polar operation with 4 leads (A, /A, B, /B)
-Double and triple standard stack sizes
-Supports up to 2.8A RMS current (depending on motor frame size and stack)
-200 steps per revolution when operating under full step mode (1.8
degree/step)
-Optional 1000 count encoder on NEMA 17 and 23 models
-All motors are of Insulation Class B.
-The insulation resistance is 100 MΩ Min. 500VDC.

Stepper Motor Manual page 5 rev 1.08
2. Part Numbering
STM- - - -
Motor Frame Size –Standard bi-polar step motors are available in NEMA 11, NEMA
17, and NEMA 23 sizes.
Motor Stack Size –Standard stack size motor available: (2) Double, (3) Triple.
Typically, a larger size motor can handle higher torque but is slower and require higher
current.
Option Encoder –NEMA 17 and NEMA 23 motors are available with an optional 1000
count optical encoder. The encoder is provided with an enclosure and flying lead wire
interface.
Motor Frame Size
11 –NEMA 11
17 –NEMA 17
23 –NEMA 23
Motor Stack Size
2–Double
3–Triple
Motor Specification
Number
Optional Encoder
-E100 –1000 lines

Stepper Motor Manual page 6 rev 1.08
3. Dimensions
STM-11-X-2
Dimensions in mm
STM-11-X-2-E100
Dimensions in mm
Stack Size
Length A
Double
45 mm
Triple
51.1 mm

Stepper Motor Manual page 7 rev 1.08
STM-17-X-1
Dimensions in mm
STM-17-X-1-E100
Dimensions in mm
Stack Size
Length A
Double
40mm
Triple
48mm

Stepper Motor Manual page 8 rev 1.08
STM-23-X-1
Dimensions in mm
STM-23-X-1-E100
Dimensions in mm
Stack Size
Length A
Double Stack
54mm
Triple Stack
76mm

Stepper Motor Manual page 9 rev 1.08
STM-23-X-2
Dimensions in mm
Stack Size
Length A
Triple Stack
76mm

Stepper Motor Manual page 10 rev 1.08
4. Motor Specifications
The following chart shows the specifications of standard step motors used for all Arcus
products. All standard step motors are 1.8 degree bi-polar step motors.
NEMA
Size
Part #
Stack
Size
Amp /
Phase
Holding
Torque
Resistance
/ Phase
Inductance
/ Phase
Inertia
11
STM-11-2-2
2
1.3A
0.1 N-m
1.3 Ohm
0.8 mH
0.07 oz-in2
STM-11-3-2
3
1.3A
0.12 N-m
1.9 Ohm
1.7 mH
0.1 oz-in2
17
STM-17-2-1
2
1.7A
0.44 N-m
1.5 Ohm
3.0 mH
0.28 oz-in2
STM-17-3-1
3
2.0A
0.59 N-m
1.4 Ohm
2.7 mH
0.37 oz-in2
23
STM-23-2-1
2
2.8A
0.95 N-m
0.9 Ohm
2.5 mH
1.64 oz-in2
STM-23-3-1
3
2.8A
1.41 N-m
1.13 Ohm
3.6 mH
2.62 oz-in2
STM-23-3-2
3
3.0A
1.5 N-m
1.15 Ohm
4.7 mH
1.97 oz-in2
NEMA Size
Part #
Stack
Size
Max Axial
Force
Max Radial
Force
11
STM-11-2-2
2
5N
8N
STM-11-3-2
3
5N
8N
17
STM-17-2-1
2
15N
10N
STM-17-3-1
3
15N
10N
23
STM-23-2-1
2
15N
75N
STM-23-3-1
3
15N
75N
STM-23-3-2
3
15N
75N

Stepper Motor Manual page 11 rev 1.08
5. Torque Curves
STM-11-X-2

Stepper Motor Manual page 12 rev 1.08
STM-17-X-1

Stepper Motor Manual page 13 rev 1.08
STM-23-X-1

Stepper Motor Manual page 14 rev 1.08
6. Connectors
Connector Information
Manufacturer: Hirose
Connector Part Number: DF3-4S-2C
Socket Pin Number: DF3-22SC
Crimp Tool: DF3-TA22-HC
Note: All motor wires use the same connector.
Wire Color Code –Motor Wires
STM-11-X-2
Phase A
BLUE
Pin 1
Phase /A
RED
Pin 2
Phase B
GREEN
Pin 3
Phase /B
BLACK
Pin 4
For: STM-11-2-2, STM-11-3-2
STM-17-X-1, STM-23-X-1
Phase A
RED
Pin 1
Phase /A
RED/WHITE
Pin 2
Phase B
GREEN
Pin 3
Phase /B
GREEN/WHITE
Pin 4
For: STM-17-2-1, STM-17-3-1, STM-23-1-1, STM-23-3-1
STM-23-X-2
Phase A
RED
Pin 1
Phase /A
YELLOW
Pin 2
Phase B
BLUE
Pin 3
Phase /B
ORANGE
Pin 4
For: STM-23-3-2

Stepper Motor Manual page 15 rev 1.08
Wire Color Code –Encoder Wires
For STM series with –E100 encoder option, 12” flying lead wires are provided for
interfacing to the encoder. See below for the color code
GND
Black
Z
Yellow
A
White
5V
Red
B
Green
For: STM-17 and STM-23
5V
Red
GND
Black
A
White
/A
White/Black
B
Green
/B
Green/Black
Z
Yellow
/Z
Yellow/Black
For: STM-11

Stepper Motor Manual page 16 rev 1.08
7. Connector Extensions
All STM purchases come with a 12” extension cable that extends the integrated
connector into flying lead wires for easy interfacing.
NEMA 11/17/23

Stepper Motor Manual page 17 rev 1.08
Contact Information
Arcus Technology, Inc.
3159 Independence Drive
Livermore, CA 94551
925-373-8800
www.arcus-technology.com
The information in this document is believed to be accurate at the time of publication but is subject to
change without notice.