1. Introduction
This manual provides detailed instructions for the safe installation, operation, maintenance, and troubleshooting of the Nidec 24H055M020 Brushless Servo Motor. Please read this manual carefully before installing, operating, or maintaining the motor to ensure safe and efficient use, prevent equipment damage and personal injury, and extend the service life of the motor.
2. Specifications
The Nidec 24H055M020 is a precise and controllable micro brushless servo motor with a built-in drive board and NSK ball bearings, featuring a 100-line signal encoder for feedback.
Figure 1: Motor Dimensions
| Feature | Value |
|---|---|
| Model Number | 24H055M020 |
| Type | Servo Motor |
| Outer Diameter | 41.9 mm |
| Motor Height | 34 mm |
| Motor Shaft Diameter | 6 mm (with 4.5 mm flat position) |
| Output Shaft Length | 16.5 mm |
| Motor Weight | 118 grams |
| Voltage | DC 12V (Operating range: DC 10V-13V) |
| Maximum Speed | 3900 RPM |
| Line Length | 100 mm |
| Use | Home Appliance |
| Origin | Mainland China |
| Certification | None |
| High-concerned chemical | None |
3. Setup and Wiring
Careful attention to wiring and power supply is crucial to prevent damage to the motor's built-in drive board. Always ensure correct polarity and voltage within the specified range.
Figure 2: Motor Wiring Diagram
3.1. Wiring Connections
- Yellow Line (PWM): Requires a pulse frequency input to control motor speed.
- Blue Line (Start/Stop): Connect to the positive pole to start the motor; disconnect to stop.
- White Line (Electronic Brake): Leave suspended to release the brake; connect to GND to engage the brake.
- Green Line (Direction): Leave suspended for Clockwise (CW) rotation; connect to the positive pole for Counter-Clockwise (CCW) rotation. If selecting CCW, connect the direction line to the starting line in parallel, ensuring the starting line (blue) is the slowest to conduct or the first to disconnect.
- Black Lines (GND): Ground connections.
- Red Lines (+12V): Power supply input. Ensure voltage is strictly between DC 10V and 13V.
- Pins 5, 6, 7, 8 (Feedback Signals): These are for encoder feedback. Pin 8 (purple wire) is also GND. The other three lines provide a +3.7V voltage and a signal output. The precise usage of these feedback lines is not fully detailed.
3.2. Power Supply Notes
- Always check the power supply voltage to ensure it is within the rated DC 10V-13V range.
- Ensure correct power supply polarity. Incorrect connection will damage the built-in drive board.
- The motor requires a higher current for starting than for continuous running. Ensure your power supply can provide sufficient current during startup.
4. Operation
4.1. Speed Control (PWM)
The motor's speed is controlled via the Yellow (PWM) line by inputting a pulse frequency. The motor can only be started when the pulse frequency is between 16000HZ and 26000HZ. Once started, the speed can be adjusted by varying the pulse frequency between 1000HZ and 26000HZ.
| Pulse Frequency | Speed (RPM) | Current (MA) |
|---|---|---|
| 1000 HZ | 150 rpm | 40 MA |
| 10000 HZ | 1500 rpm | 68 MA |
| 12000 HZ | 1800 rpm | 75 MA |
| 18000 HZ | 2700 rpm | 96 MA |
| 22000 HZ | 3300 rpm | 108 MA |
| 26000 HZ | 3900 rpm | 122 MA |
This motor demonstrates precise speed control, with approximately 150 RPM increase for every 1000 Hz increase in pulse frequency.
4.2. Direction Control
The motor's rotation direction is controlled by the Green line. Refer to the 'Wiring Connections' section for details on setting CW or CCW rotation.
4.3. Starting Anomaly
During testing, it was observed that if the motor is wired to start using the positive electrode of the starting line, it can only effectively start when the input pulse frequency is between 16000HZ and 26000HZ. If the input frequency is between 1100HZ and 16000HZ, the motor may shake but will not start. However, once started at a higher frequency, the speed can be adjusted down to 1000HZ.
5. Maintenance
Regular maintenance ensures the longevity and optimal performance of your motor.
- Safety Precautions: Always take safety precautions when working with high-speed and power motors.
- Cleanliness: Keep the motor surface and heat dissipation fins clean to ensure good ventilation and prevent overheating.
- Bearings: Periodically check the NSK ball bearings for wear or seizure. If necessary, add lubricating oil or replace them.
- Wiring: Regularly inspect all wiring connections for looseness or damage. Tighten loose terminals and repair any damaged wiring promptly.
- Load: Ensure the motor is not continuously overloaded, as this can lead to overheating and premature wear.
6. Troubleshooting
This section outlines common issues, their possible causes, and recommended troubleshooting methods.
| Fault Phenomenon | Possible Causes | Troubleshooting Methods |
|---|---|---|
| Motor cannot start |
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| Motor makes abnormal noise |
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| Motor overheats |
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7. User Tips
- Continuous Rotation: For continuous rotation in a specific direction, ensure the Green (Direction) line is correctly configured (suspended for CW, connected to positive for CCW) and maintained in that state.
- Speed Control Range: While the motor can operate down to 150 RPM (at 1000 Hz PWM), direct control from 0 RPM may not be achievable with the described wiring method due to the minimum starting frequency requirement.
- Starting Frequency: Remember the motor's specific starting behavior: it requires a pulse frequency between 16000HZ and 26000HZ to initiate rotation. Once running, the frequency can be lowered for speed adjustment.
- Polarity is Key: Always double-check the power supply polarity before connecting to avoid damaging the internal drive board.
8. Warranty and Support
For additional detailed information, diagrams, or specific technical support, please refer to the official user manual PDF available at: Nidec 24H055M020 User Manual (PDF).
Please note that the seller acknowledges some aspects of the motor's advanced features, particularly the feedback lines, may require further technical understanding beyond the scope of this basic manual.
