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How to solve the problem of unstable voltage of miniature DC motor?

2019-11-16 09:53:00

How to solve the problem when the miniature DC motor encounters voltage instability, let's briefly analyze it for everyone.
(1) Magnetic pole gasket: Place benign magnetic conductive material under the pole pole shoes of the DC motor to reduce the excitation magnetic field gap, which can saturate the output characteristics at a small excitation current, so that the output voltage of the DC motor Reached stability.
(2) A suitable resistive load, such as an incandescent light bulb, is connected in parallel across the magnetic field adjusting resistor of the excitation circuit. The resistance value of the resistive load after heating becomes a non-linear resistance characteristic, so that the field resistance line and the excitation characteristic start. The segment has a large intersection angle, and an obvious intersection point with the no-load characteristic curve is obtained, so that the DC motor will also have a stable operating point at lower voltages.
(3) Adopt generator automatic excitation adjustment device: The generator automatic excitation adjustment device has good excitation characteristics, and has various adjustment methods such as constant reactive power and constant power factor, which are very effective in improving the stability and transient response of the system.


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