MTC (Motor Temperature Control) is a patented (US PAT. 11,394,331 & 11,817,807, CN Pat. ZL 201880086019.9, patents pending elsewhere) innovation that actively manages and maintains spindle motor temperature, regardless of operating conditions, by modulating the motor operating efficiency.  Tool manufacturers will see benefits with grinders in production sooner as they quickly reach thermal stability, and improved part consistency as thermal variation of the grinding spindle is drastically reduced.