The ACS-23-53 Coreless Servo Series is designed for high-precision motion control in demanding OEM applications. Combining a compact 23 mm form factor, integrated magnetic encoder and optional planetary gearboxes, it is well suited for robotics, electro-optical systems, unmanned platforms (UAVs), medical devices, industrial automation and defense applications requiring fast response, smooth motion and reliable performance.
How to Select the Correct ACS-23-53 Model
Choose the model primarily according to the available DC supply voltage, required operating speed, continuous torque and output power. The two 24 V versions use different windings: ACS-23-53-24A provides higher rated torque at lower speed and current, while ACS-23-53-24B provides higher speed, higher output power and higher stall torque.
| Parameter | Unit | ACS-23-53-09 | ACS-23-53-12 | ACS-23-53-24A | ACS-23-53-24B | ACS-23-53-36 | ACS-23-53-48 |
|---|---|---|---|---|---|---|---|
| Nominal Voltage | V | 9 | 12 | 24 | 24 | 36 | 48 |
| No-Load Speed | rpm | 7,370 | 11,500 | 7,570 | 11,000 | 11,500 | 11,000 |
| No-Load Current | mA | <40 | <80 | <18 | <40 | <20 | <15 |
| Rated Speed | rpm | 6,160 | 10,000 | 6,350 | 9,860 | 10,000 | 9,528 |
| Rated Torque | mNm | 17 | 20.5 | 28.1 | 26.7 | 25 | 25 |
| Rated Current | A | 1.46 | 2.06 | 0.93 | 1.29 | 0.83 | 0.60 |
| Output Power | W | 11 | 22.2 | 18.7 | 27.5 | 26.2 | 25 |
| Stall Torque | mNm | 101 | 195 | 126.8 | 243.1 | 190 | 183 |
| Stall Current | A | 8.74 | 19.7 | 4.2 | 11.7 | 6.4 | 4.4 |
| Maximum Efficiency | % | 83 | 80 | 80 | 80 | 86 | 86 |
| Terminal Resistance | Ω | 1.03 | 0.61 | 5.70 | 2.05 | 5.65 | 10.88 |
| Torque Constant (Kt) | mNm/A | 11.6 | 9.9 | 30.2 | 20.7 | 29.8 | 41.5 |
| Speed Constant (Kn) | rpm/V | 823 | 962 | 315 | 460 | 320 | 230 |
| Speed/Torque Gradient | rpm/mNm | 71.2 | 57 | 43.4 | 44 | 59 | 59 |
| Terminal Inductance | mH | 0.11 | 0.25 | 0.45 | 1.07 | 2.60 | 4.40 |
| Rotor Inertia | g·cm² | 9.7 | 9.4 | 9.4 | 9.4 | 9.4 | 9.4 |
Quick Selection Guide
| Application Requirement | Recommended Model |
|---|---|
| Low-voltage, compact systems | ACS-23-53-09 |
| High-speed operation from a 12 V supply | ACS-23-53-12 |
| Highest rated torque with low current at 24 V | ACS-23-53-24A |
| Highest output power and stall torque at 24 V | ACS-23-53-24B |
| High efficiency with a 36 V supply | ACS-23-53-36 |
| Lowest current and highest torque constant | ACS-23-53-48 |
Selection note: Stall torque and stall current represent short-duration limiting conditions and should not be treated as continuous operating values.
Mechanical Dimensions
The ACS-23-53 features a compact 23 mm diameter housing designed for precision motion control applications where installation space is limited. The standardized mounting interface and shaft dimensions simplify integration into new and existing designs, while the integrated magnetic encoder eliminates the need for external feedback devices.
Key Features
- Compact Ø23 mm housing
- Integrated 3-channel magnetic encoder
- Precision D-cut output shaft
- Standardized mounting interface
- Compatible with APG-22 planetary gearboxes
- Designed for robotics, medical devices, EO/IR systems, UAVs and industrial automation
Integrated Magnetic Encoder
The ACS-23-53 features an integrated high-resolution magnetic incremental encoder, providing reliable closed-loop feedback for precise speed and position control. With differential A/B/Z outputs and a compact built-in design, the encoder delivers excellent noise immunity and eliminates the need for external mounting, simplifying system integration while improving overall reliability.
Encoder Specifications
| Parameter | Specification |
|---|---|
| Encoder Type | Magnetic Incremental Encoder |
| Resolution | 1000 CPT |
| Output Channels | A, B, Z |
| Output Type | Differential (Line Driver) |
| Supply Voltage | +5 VDC |
Encoder Connections
| Pin | Signal | Description |
|---|---|---|
| 1 | +5 V | Encoder Supply |
| 2 | GND | Encoder Ground |
| 3 | A− | Channel A (Differential) |
| 4 | A+ | Channel A (Differential) |
| 5 | B− | Channel B (Differential) |
| 6 | B+ | Channel B (Differential) |
| 7 | Z− | Index Channel (Differential) |
| 8 | Z+ | Index Channel (Differential) |
| Motor + | Motor Terminal | Positive Motor Lead |
| Motor − | Motor Terminal | Negative Motor Lead |
Signal Description
- A / B Channels – Quadrature encoder outputs used to determine rotational speed and direction.
- Z Channel – Index (reference) pulse generated once per revolution for homing and position reference.
- Differential Outputs – A+, A−, B+, B−, Z+, and Z− provide improved immunity to electrical noise, making the encoder suitable for industrial automation, robotics, medical equipment and other high-precision motion control applications.
System Integration
The ACS-23-53 is designed for closed-loop motion control systems. A typical installation consists of the motor, an optional planetary gearbox and a compatible servo drive.
Typical System Configuration
DC Power Supply
│
▼
Servo Drive
│
┌────┴────┐
│ │
Motor Encoder
(Power) (A/B/Z)
│
▼
ACS-23-53
│
(Optional)
APG-22 Planetary Gearbox
│
▼
Mechanical Load
Typical Connections
| Connection | Description |
|---|---|
| DC Power Supply → Servo Drive | Provides operating power. |
| Servo Drive → Motor | Drives the motor winding. |
| Encoder → Servo Drive | Provides speed and position feedback through A/B/Z differential signals. |
| Optional APG-22 Gearbox | Increases output torque and reduces output speed. |
Notes
- The encoder requires a +5 VDC supply.
- The motor power terminals and encoder signals are connected separately.
- The servo drive uses encoder feedback for accurate speed and position control.
- APG-22 gearboxes can be supplied factory-assembled with the motor.
Optional Planetary Gearboxes
The APG-22 Series planetary gearboxes are designed to complement the ACS-23-53 Coreless Servo Motor, providing increased output torque, reduced output speed and improved positioning capability while maintaining a compact footprint. Multiple reduction ratios are available to optimize the motor for high-speed, high-torque or precision motion control applications.
Standard Models
| Amironic Model | Reduction Ratio | Stages |
|---|---|---|
| APG-22-4 | 4:1 | 1 |
| APG-22-16 | 16:1 | 2 |
| APG-22-64 | 64:1 | 3 |
| APG-22-256 | 256:1 | 4 |
| APG-22-1024 | 1024:1 | 5 |
Additional reduction ratios are available upon request.
Why Use a Planetary Gearbox?
- Higher output torque
- Lower output speed
- Improved positioning accuracy
- Increased load capability
- Compact coaxial design
- Factory-matched with the ACS-23-53 Series
Compatible Motor
ACS-23-53 Coreless Servo Series
Mechanical Dimensions
The APG-22 Series planetary gearbox features a compact 22 mm diameter housing designed for seamless integration with the ACS-23-53 Coreless Servo Motor. Its precision-machined mounting interface and output shaft ensure accurate alignment, smooth power transmission and reliable operation in demanding motion control applications.
The gearbox is available in multiple reduction ratios and stage configurations. While the mounting dimensions remain identical across the series, the overall gearbox length (L) varies according to the selected reduction ratio.
Key Features
- Compact Ø22 mm housing
- Precision planetary gear design
- Standardized mounting interface
- Precision output shaft
- Multiple reduction ratios available
- Compatible with ACS-22 and ACS-23 Series motors
- Designed for robotics, medical devices, industrial automation, EO/IR systems and UAV applications
Typical Applications
The ACS-23-53 Coreless Servo Series is designed for demanding precision motion control applications, including:
- EO/IR Gimbals & Stabilized Camera Systems
- UAV & Drone Payloads
- Robotics & Robot Joints
- Pan & Tilt Positioning Systems
- Defense & Military Equipment
- Optical & Electro-Optical Instruments
- Medical Devices
- Laboratory & Analytical Equipment
- Industrial Automation
- Precision Motion Control Systems
Frequently Asked Questions (FAQ)
What is a coreless servo motor?
A coreless servo motor features a lightweight ironless rotor, providing faster acceleration, smoother motion and lower inertia than conventional brushed DC motors.
Is the encoder included?
Yes. Every ACS-23-53 motor includes an integrated 1000 CPT magnetic incremental encoder with differential A/B/Z outputs.
Can I add a planetary gearbox?
Yes. The ACS-23-53 is compatible with the APG-22 Series planetary gearboxes, available in multiple reduction ratios.
Which voltage should I choose?
Select the winding according to your available DC supply voltage and the required speed and torque characteristics.
Can the motor be supplied with a gearbox already assembled?
Yes. Motor and planetary gearbox assemblies are available for simplified integration.
Is the encoder absolute or incremental?
The ACS-23-53 features an integrated incremental magnetic encoder with A/B/Z differential outputs.
Glossary
Coreless Motor
A DC motor with an ironless rotor, offering low inertia, rapid acceleration and smooth operation.
Servo Motor
A motor used in a closed-loop control system with encoder feedback for accurate speed and position control.
Incremental Encoder
A feedback device that generates pulses proportional to shaft rotation, enabling precise speed and position measurement.
Magnetic Encoder
An encoder that uses magnetic sensing technology to determine shaft position, providing reliable operation in industrial environments.
Planetary Gearbox
A compact gearbox that increases output torque while reducing rotational speed through a planetary gear arrangement.
Reduction Ratio
The ratio between motor speed and gearbox output speed (e.g. 64:1).
Rated Torque
The continuous torque the motor can deliver under normal operating conditions.
Stall Torque
The maximum torque produced when the motor shaft is prevented from rotating. This value is intended for short-duration conditions only.
Torque Constant (Kt)
The relationship between motor current and generated torque, typically expressed in mNm/A.
Speed Constant (Kn)
The relationship between applied voltage and no-load motor speed, typically expressed in rpm/V.
Closed-Loop Control
A motion control system that continuously uses encoder feedback to monitor and correct motor position and speed.