The primary motive of Jim Crow Laws was to keep Blacks in the South as near slavery as possible. They were specifically designed to keep Blacks from voting, sitting on juries, and enjoying certain economic advantages. As was pointed out in a previous post, one cannot separate Jim Crow Laws from the racism which was endemic in the South. One must remember that White Southerners looked on Blacks generally as slaves. Free blacks were the exception. The South was unwilling--and to a great extent unable--to accept the notion of free blacks enjoying the same rights as Whites; and Jim Crow laws were the result--an attempt to maintain as near as possible. the status quo which had existed before the war.

There is no question that racism and white supremacy were the major causes of the Jim Crow laws in the South.  No other causes were nearly as important as racism.

If you have to try to say that other causes were important, you could point to anger at the North after the Civil War.  You could say that the South felt that black rights had been imposed upon it by the North.  You could argue that the motivation behind the Jim Crow laws was not to say that blacks were inferior, but rather to say that the North could not tell the South what to do.  If you look at it like this, these laws were an act of defiance against the North, not an act of hatred towards blacks.

However, I do not know of any reputable historians who argue that the Jim Crow laws were mainly motivated by anything but racism.