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Nidec 24H Brushless Servo Motor

Nidec 24H Brushless Servo Motor User Manual

Model: 24H Brushless Servo Motor with Built-in Drive and 100 Line Encoder

1. Introduction

This manual provides detailed instructions for the safe installation, operation, maintenance, and troubleshooting of the Nidec 24H 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.

Safety Precaution: High speed and power motors require careful handling. Always take appropriate safety measures during operation.

Please note: These motors are used units. While tested for functionality, minor cosmetic imperfections may be present.

2. Specifications

2.1 Performance Characteristics

Voltage No-load Current No-load Speed
DC 9V 70mA 2246 RPM
DC 12V 80mA 3020 RPM
DC 24V 100mA 6100 RPM

2.2 General Specifications

  • Model Number: 8mm Mini Coreless Motor
  • Construction: Permanent Magnet
  • Type: Micro Motor
  • Protect Feature: Totally Enclosed
  • Commutation: Brushless
  • Efficiency: Other (General purpose)
  • Origin: Mainland China
  • Certification: NONE
  • Use: Home Appliance (and other suitable applications)
  • Condition: Used

2.3 Dimensions

Diagram illustrating the dimensions of the Nidec 24H Brushless Servo Motor
Figure 1: Motor Dimensions. Shaft diameter: 6mm, 9-tooth helical gear, Shaft length: 18.5mm, Motor length: 42mm, Body diameter: 34mm.

3. Installation and Setup

3.1 Wiring Instructions

Careful wiring is crucial for proper operation and to prevent damage. Refer to the diagram below for connections.

Detailed wiring diagram for the Nidec 24H Brushless Servo Motor
Figure 2: Motor Wiring Diagram. Connections for power, control, and encoder signals.
  • Power Supply: Connect the red wire to the positive pole (+) and the black wire to the negative pole (-) of a DC 12-24V power supply.
  • Start Wire: Connect the yellow wire (start wire) to the positive pole of the power supply via a 1kΩ resistor. If the power supply is below 12V, the resistor may not be necessary.
  • PWM Speed Regulation: The white PWM wire is used for speed control. Connect it to the negative pole for high-speed operation. Input a 20KHz pulse width modulation (PWM) signal to this wire to adjust the motor speed.
  • Forward/Reverse Switching: The green wire can be connected to the negative pole to switch between forward and reverse rotation.
  • Encoder Power Supply: The encoder requires a 5V power supply. If the encoder is not being used, these wires can be ignored.

Important: It is strictly forbidden to reverse the polarity of the brushless motor. Always use a regulated, non-surge DC power supply (e.g., battery, regulated power supply).

Caution: When switching between forward and reverse, it is best to stop the motor first to prevent instantaneous surges that could damage the motor or drive.

3.2 Mounting Options

Image showing mounting options for the motor
Figure 3: Motor Mounting. Supports 180-degree diagonal and 120-degree 3-hole installations with 3mm threads.

The motor supports two primary mounting configurations: 180-degree diagonal and 120-degree 3-hole patterns. The mounting holes are threaded for 3mm screws.

Image demonstrating that the motor bracket can be removed if not needed
Figure 4: Removable Motor Bracket. The motor's mounting bracket can be detached if your application does not require it.

4. Operating Instructions

4.1 Basic Operation

  1. Ensure all wiring is correct according to Section 3.1.
  2. Connect the motor to a regulated DC power supply within the 12-24V range.
  3. To start the motor, ensure the yellow start wire is connected as described in Section 3.1.
  4. For high-speed operation, connect the white PWM wire to the negative pole of the power supply.

4.2 Speed Regulation (PWM)

The motor's speed can be adjusted by providing a 20KHz PWM signal to the white PWM wire. The duty cycle of the PWM signal will determine the motor's rotational speed.

4.3 Direction Control

To switch the motor's direction of rotation, connect the green wire to the negative pole of the power supply. Remember to stop the motor before changing direction to prevent damage from sudden surges.

4.4 Encoder Usage

If position or speed feedback is required, connect the encoder's 5V power supply and utilize the Signal A and Signal B outputs. If not needed, the encoder wires can be left unconnected.

5. Maintenance

5.1 General Notes for Micro Motors

  • Power Supply Check: Always ensure the power supply is within the rated voltage range. Motor startup often requires a higher current than its running current.
  • Polarity Verification: Before powering on, double-check the power supply polarity. For brushless motors, incorrect polarity can cause severe damage.
  • Safety Precautions: High-speed and high-power motors require strict safety precautions during operation.

For more detailed maintenance procedures, please refer to the official user manual PDF available at Nidec 24H Brushless Servo Motor User Manual (PDF).

6. Troubleshooting

This section provides common issues and their potential solutions. For complex problems, consult a qualified technician or refer to the detailed PDF manual.

Fault Phenomenon Possible Causes Troubleshooting Methods
Motor cannot start
  1. No power supply or power supply voltage is too low.
  2. Wiring is wrong or loose.
  3. Motor is overloaded.
  4. Bearings are seized due to shipping, the shaft moved its position.
  5. Rotor is stuck.
  6. Starter or control device is faulty.
  1. Check the power supply and restore normal voltage.
  2. Check and correct the wiring, tighten loose terminals.
  3. Reduce the load or check the driven equipment.
  4. Disassemble and maintain the bearings, replace if necessary.
  5. Check and remove the obstacle causing the rotor to be stuck.
  6. Check and repair or replace the starter and control device.
Motor makes abnormal noise
  1. Shaft misalignment.
  2. Bearings are worn or lack lubrication.
  3. Fan is damaged or loose.
  4. Rotor and stator rub against each other.
  5. Loose parts in the motor.
  1. Realign the shaft.
  2. Add lubricating oil or replace the bearings.
  3. Replace or tighten the fan.
  4. Check the gap between rotor and stator, adjust or repair.
  5. Check and tighten all loose parts.
Motor overheats
  1. Overload.
  2. Poor heat dissipation.
  3. Power supply voltage is too high or too low.
  4. Phase loss operation (3-phase motor).
  5. Bearings are worn or seized.
  6. Winding insulation is damaged, short circuit.
  1. Reduce the load.
  2. Clean the motor surface and heat dissipation fins, ensure good ventilation.
  3. Check and adjust the power supply voltage.
  4. Check the wiring, repair the phase loss fault.
  5. Maintain or replace the bearings.
  6. Check the windings, repair or replace if necessary.

7. User Tips

  • Compact Size: The motor is quite small (8mm in size), making it suitable for applications where space is limited.
  • Versatile Use: This motor is well-suited for speed regulation tasks and can be integrated into various home appliances and other projects requiring a brushless motor.
  • Strong Magnetism: Featuring a permanent magnet, the motor offers robust performance.
  • Protection: The totally enclosed design provides protection from dust and other external factors, enhancing durability.
  • Controller Recommendation: For precise speed control, consider using a dedicated motor controller that can output a 20KHz PWM signal.

8. Support

For further assistance, technical inquiries, or if you encounter issues not covered in this manual, please contact the seller or manufacturer's support channel.

Additional item guides and documents, including the full user manual, are available in PDF format: Nidec 24H Brushless Servo Motor User Manual (PDF).

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