An asynchronous motor forward and reverse rotation control circuit

By designing an asynchronous motor forward and reverse rotation control circuit and using temperature control switches and contactors KM1-KM5 for coordinated control, the problem of frequency converters failing to operate normally in low-temperature environments was solved, enabling normal operation and fault switching of the motor in extremely cold environments, and improving the adaptability and safety of motor control.

CN224555507UActive Publication Date: 2026-07-24SHANDONG AINUO INTELLIGENT INSTR CO LTD
View PDF 0 Cites 0 Cited by

Patent Information

Authority / Receiving Office
CN · China
Patent Type
Utility models(China)
Current Assignee / Owner
SHANDONG AINUO INTELLIGENT INSTR CO LTD
Filing Date
2025-07-18
Publication Date
2026-07-24

AI Technical Summary

Technical Problem

In the existing technology, frequency converters cannot work properly in low-temperature environments, which causes asynchronous motors to be unable to perform forward and reverse rotation control normally. In addition, low-temperature frequency converters are expensive, and ordinary frequency converters require manual intervention to switch control, which is not very adaptable.

Method used

An asynchronous motor forward and reverse rotation control circuit was designed. It uses a temperature control switch to detect the temperature and automatically switches to contactor control mode in low-temperature environments. The forward and reverse rotation control of the asynchronous motor is achieved through the coordinated control of contactors KM1-KM5, including protection circuits to prevent overload and short circuit.

Benefits of technology

It ensures the motor operates normally in both forward and reverse directions in extremely cold environments (such as -40℃), improving the adaptability of motor control, and automatically switches to contactor control in case of inverter failure to prevent device damage.

✦ Generated by Eureka AI based on patent content.

Smart Images

  • Figure CN224555507U_ABST
    Figure CN224555507U_ABST
Patent Text Reader

Abstract

The utility model provides a kind of asynchronous motor positive and negative rotation control circuit, control module M2 is electrically connected with temperature control switch S1, the frequency conversion control output end of control module M2 is electrically connected with the frequency conversion control input end of frequency converter M1, and the frequency conversion control output end of frequency converter M1 is electrically connected with asynchronous motor M by contactor KM5;Series circuit of contactor KM2, contactor KM3 is connected in parallel with series circuit of contactor KM1, frequency converter M1, contactor KM5, and, contactor KM4 is connected in parallel with contactor KM3, contactor KM1, contactor KM5 and contactor KM2 are interlocked connection, contactor KM3 and contactor KM4 are interlocked connection;When frequency converter cannot work normally in low temperature environment, frequency converter is cut off, and still can realize the positive and negative rotation control of asynchronous motor under the coordination control of contactor, solve the problem that motor cannot run in low temperature environment, improve the adaptability of motor control.
Need to check novelty before this filing date? Find Prior Art