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Stator Mount

RENCOL® Tolerance Rings to simply fix the electric motor stator to the housing. 
 
A significant trend in the automotive industry is the shift to lightweight design. This shift has led to the use of different materials such as aluminium. In the electric motor market this can cause problems due to difference in the thermal expansion coefficients. The aluminium housing will expand at a higher rate than the iron-based stator which can cause a drop off in retention force and, therefore, result in a dislodged stator. 
 
Other issues are associated with the assembly process where stator mounting solutions such as the use of adhesive or shrink-fitting require energy-intensive heating steps. 
 

Mount stator motor housing assembly concentricity tolerance ring rencol

 
RENCOL® technology offers solutions to these issues, aided by system level simulation, optimising the stator joint design. The competency offered by Saint-Gobain has led to simplified assembly processes and better electric motor stator retention forces throughout the operating temperature range and an increase of the temperature range.
 
These benefits are achieved without sacrificing concentricity of the stator and rotor, enabling an efficient system in terms of input power and functional output power.

 

RENCOL® Tolerance Ring

  • Increased tolerances of mating components
  • Use of dissimilar materials
  • Control of NVH properties of EPS motor
  • Reduce number of fixing components / motor components
  • Simple to assemble

Assembly Benefits of RENCOL® Tolerance Ring

Retention over Temperature

The dimensions between the stator and housing are able to vary, usually due to thermal expansion but also manufacturing tolerance stack-ups, whilst the waves apply a consistent retention force

Retention force over temperature stator motor mount tolerance ring rencol

A numerically obtained example of push out force as a function of temperature including manufacturing tolerance effects. The RENCOL® Tolerance Ring used in this example retains more retention force than the press fit solution, when subject to increasing temperatures.

Assembly Force

The RENCOL® product is assembled by applying an axial force with a press to insert the stator into the aluminium housing. Once assembled, no curing or settling time is required. 

Assembly force displacement stator motor mount rencol

Assembly force as a function of displacement. The peak force required to assemble the RENCOL® tolerance ring solution is much lower than the room temperature press fit solution.

 

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