Hi, To rise the oven temperature, I try to increase my oven blower motor HP from 7.5HP to 10HP then to 15HP. The result is I have achieved my objective, the oven temperature rise when I increase the motor HP.However, those induction motors cannot run more than half year. The major problem is motor bearing broken. May I know how to solve this problem? Is it due to too high environment temperature,causing motor to trip?about 70-80degreeC (heat transfer from oven). I can't find any solution for it. Please enlighten me. Thanks!