KR940022973A - Motor protection device and temperature compensation method - Google Patents

Abstract

The present invention relates to a motor protection technology that is electronically controlled to prevent motor burnout from overheating operation. This is because a temperature sensor is installed inside the motor to increase the temperature signal of the motor in operation above the temperature value set in the protection circuit. Prior art that stops motor operation when detecting overcurrent outside the allowable current range of the motor according to the winding temperature monitoring method and overcurrent detection method and stops the motor operation at a time, and makes it possible to continuously drive the motor within the allowable current range. To solve the problem.

Accordingly, the present invention further includes a power failure detecting unit 20, a real time clock unit 30, and an EEP ROM 40 in the existing motor protection device, and is output from the real time clock unit 30 from the central processing unit 10. The central processing unit 10 recognizes the date and time of the motor operation every time to calculate the temperature characteristic value according to the date and time from the EEP ROM 50, and the temperature measurement value calculated in the first process. And a second process for calculating the motor thermal accumulation amount in consideration of the detected current value of the current detector 1 through the A / D converter 2 and the corresponding date and time for each seasonal date and time of the real-time clock function. It is possible to effectively protect the motor by obtaining the temperature characteristic value of and by controlling the motor operation from overcurrent and overheating according to the result of the motor heat accumulation amount by referring to the temperature characteristic value and the detected current amount.

Description

Motor protection device and temperature compensation method

Since this is an open matter, no full text was included.

2 is a block diagram of a motor protection device according to an embodiment of the present invention, Figure 3 is a flow chart for explaining the method of the present invention, Figure 4 is a daily change characteristic curve of the temperature (hour), Figure 5 is a seasonal characteristic Curve plot (date).

Claims (2)

A motor protection device having a current detector (1), an A / D converter (2), a memory (4), and a relay driver (6), comprising: an electrostatic detection unit (20) for monitoring a motor supply power state; A real-time clock unit 30 having a backup means for supplying commercial and accumulated power to generate a time clock and supplying real-time data periodically for each date and time, and the date of the season according to the output data for each hour of the real-time clock unit 30. A central processing unit (10) which reads out the corresponding temperature data stored in the memory for each time and the output of the A / D converter (2) and outputs a relay control signal according to the calculation result of the motor thermal accumulation amount, and the central processing unit (10) Memory (4) (5) for storing the execution program and the operation result data, and an EEP ROM (40) for storing the temperature data for each time of day, heat accumulation amount, and maintenance data at power off. Hat Protection. A first process of the central processing unit 10 recognizing the date and time of the motor operation for each real time output from the real time clock unit 30 and calculating a temperature characteristic value according to the corresponding date and time from the EEP ROM 50; Comprising a second step of calculating the motor heat accumulation amount in consideration of the temperature characteristic value calculated in the first step and the detected current value of the current detector 1 through the A / D converter (2) Way. ※ Note: The disclosure is based on the initial application.