Electric motor driving device

Abstract

The present invention relates to an electric motor driving device comprising: a lower case which has a receiving space formed therein and has an opened upper side; an upper case which forms an inner space by closing off the open surface of the lower case; a center case which is disposed in the lower case and partitions the inner space formed by the lower case and the upper case; a first substrate which is provided to the lower case and comprises a first connector; a second substrate which is provided to the center case and comprises a second connector; and a connection substrate which is disposed in the inner space and transfers an electrical signal between the substrates by comprising a first connection connector electrically connected to the first connector and a second connection connector electrically connected to the second connector.

Description

technical field [0001] The present invention relates to a motor drive unit having an improved structure. Background technique [0002] In general, a motor driving device refers to a device that controls the speed of a motor with high efficiency by changing the voltage and frequency of power supplied from an external power source and supplying it to the motor. [0003] Such a prior art motor drive device is described in Korean Publication Utility Model No. 20-2011-009729 (Title of Invention: Semiconductor Module for Electric Power). [0004] Such a prior art motor drive device is described as follows. [0005] Generally, in conventional motor drive devices, a housing main body and a cover form an overall appearance, and a circuit unit is accommodated in an internal space formed by the housing main body and the cover. [0006] In this circuit part, a plurality of main circuit substrates are arranged, such as a power supply board, a filter board, a control board and / or a cove...

AI Technical Summary

Problems solved by technology

[0007] However, the board connection structure according to this prior art has a problem that it is difficult to realize automatic assembly, and the wire or cable is similar to an antenna, and noise signals may be generated inside the motor drive device

[0008] In addition, in the conventional motor drive device, when the inner case is included between the case main body and the cover, any one of the substrates must be arranged on the lower side of the inner case in order to connect to the other board arranged on the case main body. The problem

In this substrate configuration, since the two substrates are exactly opposite each other, noise may be generated

[0009] If the board is arranged on the upper side of the inner case in order to reduce such noise, the wires or cables for connecting to another board arranged on the case body will be long, so the internal structure may become complicated and noise may increase. problems arising from

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