Variable frequency motor for electric vehicle and connection method for conversion windings of variable frequency motor

Abstract

The invention relates to a variable frequency motor for an electric vehicle and a connection method for conversion windings of the variable frequency motor. The variable frequency motor comprises six groups of stator coils U1, U2, V1, V2, W1 and W2, wherein an end head of the U1 is a connection terminal 1U; an end tail of the U1 is connected in series with the end head of the U2 to lead out a connection terminal 3U; the end tail of the U2 is a connection terminal 2U; the end head of the V1 is a connection terminal 1V; the end tail of the V1 is connected in series with the end head of the V2 to lead out a connection terminal 3V; the end tail of the V2 is a connection terminal 2V; the end head of the W1 is a connection terminal 1W; the end tail of the W1 is connected in series with the end head of the W2 to lead out a connection terminal 3W; the end tail of the W2 is a connection terminal 2W; when the variable frequency motor operates in a low frequency region, the stator coils are in star-like connection; when the variable frequency motor operates in a low-high transition region, the stator coils are in edge-extension triangular connection; and when the variable frequency motor operates in a high-frequency region, the stator coils are in triangular connection. By the invention, the phenomena of over-excitation in a low-frequency working condition and insufficient exertion in a high-frequency working condition are avoided.

Description

technical field [0001] The invention relates to a frequency conversion motor for an electric vehicle and a wiring method for a conversion winding thereof. Background technique [0002] With the rapid development of power electronics technology, AC variable frequency motors have become the mainstream of electric transmission. However, as the asynchronous motor, which is the execution motor of frequency conversion speed regulation, there is always the problem of overexcitation of the frequency conversion motor under low frequency conditions and insufficient output under high frequency conditions in the process of frequency conversion speed regulation. Contents of the invention [0003] The purpose of the present invention is to provide a variable frequency motor and the connection of the variable frequency motor to change windings at different frequencies, which overcomes the overexcitation of the variable frequency motor under low frequency conditions and insufficient outp...

AI Technical Summary

Problems solved by technology

However, as the asynchronous motor as the execution motor of frequency conversion speed regulation, in the process of frequency conversion speed regulation, there is always the problem of overexcitation of the frequency conversion motor under low frequency conditions and insufficient output under high frequency conditions.

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