The working principle and design methods of hardware and software of an integrated protection device for low-voltage flameproof motor based on STC89C58RD~+ single-chip microcomputer were(introduced) in the paper.

It analyzes the structure of flameproof high voltage electric motor in the view of testing and application,and explained the relationship between the structure and performance of this type motor.

This paper discusses the advantage and shortage of some flame proof constructions at the through position of the shaft of flame proof motor, and different flame proof constructions should be applied according to the motor with different constructions for the convenience of reduction in the difficulty for mechanical machine and assembly.

This paper discusses phenomenon of pressure piling in flame proof motor and lists the actually test data.

This paper elaborated the conditions of explosion under the coal mine pithead,and then introduced the building modules of the explosion insulation motor detection system.

By analysis and calculation for short circuit current of low voltage motor, kinds and protection methods of short circuit of the low voltage are explained.