Motor protector applied to double-speed motor and implementing method of motor protector

Abstract

The invention relates to a motor protector applied to a double-speed motor and an implementing method of the motor protector. The motor protector applied to the double-speed motor is characterized in that the motor protector comprises a power supply module (1), an analog quantity module (2), a CPU (Central Processing Unit) module (3), a switching value output module (4), a man-machine interaction module (5) and a switching value input module (6), wherein the analog quantity module (2), the switching value output module (4), the man-machine interaction module (5) and the switching value input module (6) are all connected with the CPU module (3), and the power supply module (1) is connected with the CPU module (3). According to the method, operations required to be carried out by the motor protector under different working environments are implemented by setting high-speed and low-speed parameters through software. According to the motor protector applied to the double-speed motor and the implementing method of the motor protector, one product is simultaneously provided with two groups of high-speed and low-speed parameters, and the protection and control of two devices are finished by one device, so that the customer cost is saved, the mounting space is saved, and the protective pertinence is strong.

Description

technical field [0001] The invention relates to a motor protector applied to a double-speed motor and a realization method thereof. It belongs to the field of motor protection and monitoring. Background technique [0002] The wide application of electronic motor protection and monitoring equipment has changed the old protection and control methods, and derived many new protection and monitoring ideas and methods. These ideas and methods have greatly improved the level of factory automation. [0003] However, these electronic motor protection and monitoring products still have many deficiencies, for example: for the protection and monitoring of two-speed motors, conventional method 1: use two motor protectors; method 2: use one motor protector with two sets of current transformers , the parameters that can be set include only high-speed and low-speed rated current, and there is only one group of protection parameters. Although the above two conventional methods can satisfy ...

AI Technical Summary

Problems solved by technology

Although the above two conventional methods can meet the protection and monitoring functions of the two-speed motor, the disadvantages are also obvious.

Method 1 increases customer investment, the installation space occupied by the product is large, the control circuit design is cumbersome, and maintenance is inconvenient; method 2 The installation space occupied by the product is large, and two sets of current transformers increase customer investment and workload, and only two types can be set There is no distinction between the rated current of the speed and the protection parameters, but the actual motor needs two sets of protection parameters at high speed and low speed. For example, some protections can trip at low speeds, but only alarm at high speeds.

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