System for cooling a power tool

A power tool comprising:

• a housing including an air intake and an air exhaust;
• a motor within the housing, the motor including a rotor and a stator, wherein the rotor rotates about a motor axis and the stator includes stator coils that generate a magnetic field to drive the rotor;
• a fan configured to
• pull cooling air into the housing through the air intake, and
• exhaust the cooling air out of the housing through the air exhaust;
• a plurality of field-effect transistors (FETs) within the housing, wherein the FETs couple the stator coils to a power source to allow the stator coils to generate the magnetic field;
• a FET board within the housing, wherein the FETs are mounted on the FET board;
• and
• a heat sink within the housing and secured to the FET board, the heat sink being in thermal contact with the FETs and including
• a first mounting portion and a second mounting portion, at least one FET being mounted on each of the mounting portions,
• a connecting portion between the mounting portions configured to join the mounting portions, wherein the FET board, the mounting portions, and the connecting portion form an air gap that allows the cooling air to flow in a direction defined by the motor axis from the air intake, through the air gap, and out of the air exhaust, and
• a plurality of vertical fins extending from a top surface of the connecting portion.

A power tool comprising:

• a housing including an air intake and an air exhaust;
• a motor within the housing, the motor including a rotor and a stator, wherein the rotor is coupled to a motor shaft and the stator includes stator coils that generate a magnetic field to drive the rotor, the motor shaft extending in a front-rear direction and being coupled to a drive mechanism at a front of the power tool;
• a fan configured to
• pull cooling air into the housing through the air intake, and
• exhaust the cooling air out of the housing through the air exhaust;
• a plurality of field-effect transistors (FETs) within the housing, wherein the FETs couple the stator coils to a power source to allow the stator coils to generate the magnetic field;
• a FET board within the housing, wherein the FETs are mounted on the FET board, the motor being located between the FET board and the drive mechanism in the front-rear direction;
• and
• a heat sink within the housing and secured to the FET board, the heat sink being in thermal contact with the FETs and including
• a first mounting portion and a second mounting portion, at least one FET being mounted on each of the mounting portions, and
• an air gap between the mounting portions, wherein the FETs are mounted on an outer surface of the mounting portions such that the mounting portions and the air gap are located in between at least two of the FETs;
• wherein the cooling air flows from the air intake, through the air gap, around and through the motor, and out of the air exhaust.