KR920005452A - Motor overload protection method using microcomputer - Google Patents

Abstract

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Description

Motor overload protection method using microcomputer

As this is a public information case, the full text was not included.

2 is a circuit for overload protection of a motor using a microcomputer of the present invention,

3 is a flowchart showing the operation procedure of the overload protection method of the motor using the microcomputer of the present invention.

Claims (9)

The speed PI output signal and current feedback signal of the motor driver are used as inputs for judging the overload condition of the motor.The microcomputer has a built-in A / D converter that converts the digital data necessary for the overload protection operation of the motor. The built-in timer is used to interrupt the A / D2 input of the phase current feedback signal when the A / D2 input is higher than the upper limit of the overload. When the A / D2 input is lower than the overload upper limit value, the counter buffer value is judged, and if it is not O, the count down is performed. When the speed PI output is continuously saturated for 1 second, the overload protection operation is performed. Motor overload protection using microcomputer. The absolute value of the velocity PI output signal of claim 1 comprising an operational amplifier OP ₁ , OP ₂ , a resistor R ₁ , R ₂ , R ₃ , R ₄ , R ₅ , and a diode D ₁ , D ₂ . An overload protection method for a motor using a microcomputer, the gain of which is adjusted to be 0 to + 5V through a circuit and input to the A / D1 converter of the microcomputer. According to claim 1, wherein the current feedback signal is an absolute value circuit consisting of operational amplifier (OP ₃ ) resistors (R ₆ , R ₇ , R ₈ ) and diodes (D ₃ , D ₄ ), operational amplifier (OP ₄ ), resistance An overload protection method for a motor using a microcomputer, which is input to a microcomputer through an integrating circuit composed of (R ₉ , R ₁₀ ) and a condenser (C ₁ ). The overload protection method of a motor using a microcomputer according to claim 3, wherein the absolute value circuit adjusts the resistances (R ₆ , R ₇ , R ₈ ) so that the gain is 0 to + 5V. 4. The overload protection method of a motor using a microcomputer according to claim 3, wherein the integrating circuit rectifies the sine wave input from the absolute value circuit and inputs it to the A / D converter (A / D ₂ ) of the microcomputer. The overload protection method of a motor using a microcomputer according to claim 1, wherein an input range of the A / D converters (AD ₁ and AD ₂ ) built in the microcomputer is 0 to + 5V. The overload protection method of a motor using a microcomputer according to claim 1, wherein the upper limit of the overload is set at a rated load state current input of 200% of the motor. The overload protection method of a motor using a microcomputer according to claim 1, wherein the upper limit value of the counter is set to 1000 times, and an overload condition is determined when an average load of 200% or more is applied for 5 seconds or more. The overload protection method of claim 1, wherein the microcomputer continuously monitors whether the motor is overloaded and generates a signal to block a current input to the motor when it is determined that the motor is overloaded. ※ Note: The disclosure is based on the initial application.