How to Maintain Brushless DC Motors

DC gear motors come in various types and are widely used in applications such as automotive systems, power tools, industrial control, automation, and aerospace. To ensure proper operation, it is essential to understand common issues and perform routine maintenance.

(1) Before disassembly, use compressed air to blow off dust from the motor's surface and wipe it clean.

(2) Select a suitable workspace for disassembling the DC gear motor and clear the surrounding area.

(3) Familiarize yourself with the motor's structural characteristics and the technical requirements for maintenance.

(4) Prepare the necessary tools (including specialized tools) and equipment for disassembly.

(5) To better understand operational defects, conduct a pre-disassembly test. Run the motor under load to carefully check the temperature, noise, and vibration of various components, and measure parameters such as voltage, current, and speed. Then, disconnect the load to perform a no-load test, recording the no-load current and losses.

(6) Disconnect the power supply. Remove the external wiring and make a record of the connections.

(7) Use a megohmmeter (insulation tester) with the appropriate voltage rating to measure the motor's insulation resistance. To assess insulation trends and condition by comparing the reading with values ​​from the last overhaul, convert readings taken at different temperatures to a standard reference temperature-typically 75°C.

(8) Test the absorption ratio (K). An absorption ratio greater than 1.33 indicates that the motor insulation is not damp or is only slightly damp. As with insulation resistance, absorption ratio values ​​measured at various temperatures should be converted to a standard temperature for comparison with historical data.

DC gear motors can experience various faults during or after use, sometimes due to inadequate maintenance. Much like people need rest after a day's work, DC gear motors require maintenance to ensure continued reliability.