One-way position limiting switch

Abstract

The invention disclose a one-way position limiting switch, which comprises two position limiting switches, wherein at least one diode and a capacitor are connected in parallel onto the position limiting switches, the two position limiting switches are respectively arranged at the positive electrode input end and the negative electrode input end of a direct current motor, the diode and the capacitor are connected in parallel on the position limiting switch, the positive electrode end of the direct current motor is connected with a cathode of the diode, and the negative electrode end of the direct current motor is connected with a negative electrode of the diode. The one-way position limiting switch has the following advantages that wire materials are saved, and the problem of relatively complicated wiring mode for realizing the positive and reverse position limitation is solved; the speed modulation is not influenced, and the pulse-width modulation (PWM) speed modulation control of the motor is not influenced; the loss is very little, the surge circuit impact on the diode is effectively prevented, and the service life of the diode is prolonged; and the safety is high.

Description

【Technical field】 [0001] The invention relates to a limit switch, in particular to a one-way limit switch. 【Background technique】 [0002] Limit switches are often used in motor control, especially when driving a DC motor. In the process of engineering or electronic product design, two interlocking relays are usually used to realize the forward and reverse function of the motor; for the forward and reverse limit of mechanical parts, the chip is generally used to read the level of devices such as proximity switches or infrared tubes to determine whether it is reached. The limit position; or sometimes another limit method is used to make the motor turn to the limit position to stop running. This method stops the forward and reverse rotation of the motor at the same time, so that the motor still cannot be powered on after the system is reset, and must be adjusted manually. 【Content of invention】 [0003] The purpose of the present invention is to solve the shortcomings of th...

AI Technical Summary

Problems solved by technology

In the process of engineering or electronic product design, two interlocking relays are usually used to realize the forward and reverse function of the motor; for the forward and reverse limit of mechanical parts, the chip is generally used to read the level of devices such as proximity switches or infrared tubes to determine whether it is reached. The limit position; or sometimes another limit method is used to make the motor turn to the limit position to stop running. This way makes the motor stop at the same time. After the system is reset, the motor still cannot be powered on and must be adjusted manually.

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