How to deal with voltage instability of permanent magnet DC motor
The core idea for dealing with voltage instability in permanent magnet DC motors is to stabilize the operating point through hardware adjustment or design optimization. Let me sort out the three most effective methods for you:
To deal with the voltage instability of permanent magnet DC motors, we can mainly start from three aspects: power management, motor design improvement, and system control optimization. The following are several common methods for organizing comprehensive public information:
Optimize power supply: Install a voltage regulator or uninterruptible power supply (UPS) at the front end of the motor to ensure stable input voltage and reduce the impact of grid fluctuations on the motor.
Improved motor controller: Adopting a high-performance controller to achieve real-time response to voltage fluctuations and automatic parameter adjustment, enhancing the motor's tolerance for voltage instability.
Increase redundancy design and improve insulation level: By designing dual power inputs or adding protective components to enhance system reliability, and using higher-level insulation materials to improve voltage resistance.
Excitation circuit magnetic field regulation: Connect a resistive load (such as an incandescent bulb) in parallel at both ends of the excitation circuit resistor, utilizing its nonlinear resistance characteristics to enable the motor to achieve a stable operating point even at lower voltages.
Magnetic pole gasket: A benign magnetic conductive material is inserted under the magnetic pole shoes to reduce the gap between the excitation magnetic fields and saturate the output characteristics at lower excitation currents, thereby stabilizing the output voltage.
Adopting automatic excitation regulation device: using an automatic excitation regulation device with functions such as constant reactive power and constant power factor to effectively cope with voltage fluctuations and improve system stability.
For permanent magnet synchronous motors (a common type of permanent magnet motor), special attention should be paid to the stability of the DC bus voltage and the correct setting of control system parameters.
