Heatsink for cooling power components

An electronic control system for an exercise device having a motor, the electronic control system including a circuit board and electronic components for controlling the exercise device, the motor having a power output, an improvement comprising:

• a power control module including electronic components for controlling the motor power output, the power control module being connected to the circuit board;
• and
• a cooling system for cooling the power control module, the cooling system including a heatsink and a fan, the heatsink including a base plate and a plurality of fins projecting from the base plate;
• the base plate being positioned adjacent the power control module;
• the fins enhancing heat transfer away from the base plate during operation of the power control module;
• the fan being located near the heatsink;
• wherein, during use, heat is transferred from the power control module into the heatsink and fins, the fan blowing cooling air at least over the fins, the fan being powered by a source independent of the motor power output.

An exercise treadmill comprising:

• a frame;
• a forward roller assembly mounted on the frame to rotate about a forward transverse axis;
• a rear roller assembly mounted on the frame to rotate about a rear transverse axis;
• an endless belt trained about the forward and rear roller assemblies;
• an electric motor having a power output drivingly coupled to one of the forward and rear roller assemblies;
• an electronic control system including a power control module to control the motor power output, the power control module including heat-generating electronic components;
• and
• a cooling system including a heatsink and a fan, the heatsink being located adjacent the power control module to absorb heat from the power control module during use the fan being located near the heatsink to provide cooling to the heatsink, the fan being operated from an energy source independent of the motor power output.