28mm DC Brushless Planetary Gear Motor

In the field of micro precision transmission, 28mm DC brushless planetary gear motors have become the core power choice for industrial automation, small intelligent equipment, medical devices and other scenarios due to their compact size, strong power and precise control.Huajuntong has deep roots in the micro motor field. For the 28mm size, we offer three series of brushless motors: internal rotor, coreless and external rotor, all of which can be perfectly matched with planetary gearboxes.These not only retain the core advantages of brushless motors, but also achieve "low speed, high torque and precise speed control" through the gearbox, balancing performance, cost and user experience to meet customized needs across various industries.

Huajuntong offers a full range of 28mm brushless motors. The three series are designed to match planetary gearboxes for different applications. Each product undergoes strict quality control, meeting both mass production and personalized customization requirements.

1. Huajuntong 28mm Brushless Motor Existing Models (Example: 2838 means the first number 28 is the outer diameter, 38 is the length of the brushless motor, and so on.)

Huajuntong relies on fully automated production lines and sophisticated manufacturing processes to create three series of 28mm brushless motors, all supporting seamless matching with planetary gearboxes. The specific models are as follows:

Inner Rotor (HBL) Brushless Motor (28mm): Core model HBL2838 series (including HBL2838L-01A, HBL2838L-02A), diameter 28.0mm, length 38mm, no-load speed 7200-12400rpm. Compact structure and strong power, suitable for medium and low load applications, ideal for industrial auxiliary equipment and small transmission mechanisms. Other available models in this series include HBL2833 and HBL2847.

Coreless (HCB) Brushless Motor (28mm): Focuses on high precision and low power consumption. Core models include HCB2867 series (HCB2867N-01A, HCB2867N-02A) and HCB2838 series. The HCB2838 series features a no-load speed of 20000rpm, load torque of 150gf.cm, noise ≤45dB, and a service life of over 5000 hours. It is ideal for high-precision, low-noise applications such as precision instruments. Other available models: HCB2862, HCB2854, HCB2850.

Outer Rotor (HAE) Brushless Motor (28mm): Core models HAE2820 and HAE2826 series, balancing high speed and stability. Suitable for high-load and high-speed applications such as medical equipment and smart home. The outer rotor structure enables more efficient power transmission and stable operation. Other available models: HAE2807, HAE2816, HAE2822.

II. Core Advantages of Huajuntong 28mm Brushless Motors Combined with Planetary Gearboxes

Huajuntong's 28mm brushless motors combined with planetary gearboxes achieve "1+1>2" through structural compatibility and performance complementarity, highlighting advantages in four core dimensions and suitable for various industries:

(I) Performance Advantages: Low Speed, High Torque, Precision and Durability

Brushless motors feature no brush wear, long life and high efficiency. Performance is further upgraded when matched with a planetary gearbox – converting high-speed rotation into low-speed output and amplifying torque by 3–30 times, solving the pain point of "high speed but low torque" in micro motors.

For example, the HBL2847 achieves greatly improved positioning accuracy when paired with a gearbox; the HCB2838 runs smoothly with efficiency over 85% and low heat generation during long-term operation. The overall service life can exceed 5,000 hours, reducing maintenance and replacement costs.

(II) Price Advantage: High Cost-Effectiveness, Suitable for Multiple Budgets

Relying on large-scale mass production with a 20,000 ㎡ factory and a daily output of over 20,000 units, Huajuntong offers high-performance, low-premium pricing: the HBL2847 series with gearbox provides the best cost-effectiveness for bulk purchases, the HCB2838 and HCB2867 series are priced for high-precision needs and outperform imported products, the 2820 and 2826 series suit mid-to-high-end high-load applications without extra premiums, and bulk discounts and customization are supported to avoid cost waste.

(III) Drive Mode: Flexible, Convenient and Precise Control

The full series supports PWM speed regulation and forward/reverse rotation control, and can be directly connected to the equipment control system without additional modification after matching with the gearbox. It supports DC drive with low cost when using ordinary driver boards, and the speed fluctuation is ≤±2%; for high-precision applications, it can be equipped with a closed-loop encoder with positioning accuracy of ±0.5°. The electronic commutation design avoids signal interference, providing more stable drive and suitable for high-precision intelligent equipment.

(IV) Noise Advantage: Low-noise operation, suitable for various scenarios

Brushless motors have no brush friction, and the multi-gear meshing of planetary gearboxes reduces vibration, resulting in a noise level ≤55dB when combined. The HCB2838 with gearbox operates below 45dB, ideal for sensitive applications such as medical devices. The inner and outer rotor series run at 45-55dB, meeting silent requirements for industrial and small instrument use without affecting precision.

Huajuntong 28mm DC brushless planetary gear motors are suitable for all scenarios thanks to its three series. Paired with planetary gearboxes, they solve the pain points of insufficient torque and inaccurate speed control of micro motors, while balancing cost performance and user experience, perfectly meeting the power needs of industrial automation, precision instruments, smart homes, medical devices and other fields.