Electromagnetic compatibility anti-interference system of DC (Direct Current) motor

Abstract

The invention discloses an electromagnetic compatibility anti-interference system of a DC (Direct Current) motor. The electromagnetic compatibility anti-interference system of the DC motor comprises a transformer, a first-level shielding line, a rectifier filter and control circuit, a first-level filter circuit, a second-level shielding line, a second-level filter circuit and the DC motor, wherein a secondary coil of the transformer is connected with an input end of the rectifier filter and control circuit through the first-level shielding line; an output end of the rectifier filter and control circuit after passing through the first-level filter circuit then passes through the second-level filter circuit through the second-level shielding line and is then connected with a power input end of the DC motor. The electromagnetic compatibility anti-interference system of the DC motor, provided by the invention, has the advantages of strong electromagnetic interference suppression capability, good suppression effects, and capabilities of not only suppressing common mode and difference mode noise transferred from an electric grid and external electromagnetic radiation interference, but also preventing electromagnetic interference from the DC motor to surrounding electronic devices and communication systems; and the electromagnetic compatibility anti-interference system of the DC motor is reliable and practical, is not only convenient to produce, but is also wide in application foreground, very low in cost and suitable to popularize widely.

Description

technical field [0001] The invention relates to an electromagnetic compatibility anti-interference system of a DC motor. Background technique [0002] With the continuous expansion of the application range of DC motors in production and life, the electromagnetic interference of DC motors is also becoming more and more serious. Effective suppression of electromagnetic interference of DC motors is not only a guarantee for the stable operation of the motor, but also a prerequisite for the reliable operation of other electronic equipment. A good DC motor EMC anti-interference system must not only be able to suppress the common-mode and differential-mode noise transmitted by the power grid and external electromagnetic radiation interference, but also prevent the DC motor from causing electromagnetic interference to the power grid and nearby electronic equipment, so as to realize the DC motor and Other electronic devices are electromagnetically compatible with each other. The EMC...

AI Technical Summary

Problems solved by technology

The EMC anti-interference system of DC motors in the prior art has the following problems: the use of a common-mode filter circuit and a differential-mode filter circuit, the electromagnetic interference suppression ability is limited and the suppression effect is not good; the use of unshielded wires to transmit power signals can neither Avoid external electromagnetic interference, such as the noise interference of the power grid, which will be transmitted to the next-level electronic circuit through the power transformer through the unshielded wire, and it cannot prevent the electromagnetic interference generated by the DC motor from affecting the outside

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