Inverter integrated motor

An inverter integrated motor, comprising:

• a frame, including a base plate, and a first vertical wall and a second vertical wall being arranged upright on the base plate and opposite to each other;
• a motor body received in the frame, the motor body including a casing and a rotation shaft inserted through the casing, the casing includes a protrusion portion and a plurality of motor fins, the motor fins being disposed on an outer surface of the casing and at an outside of the protrusion portion, the frame covers the casing and the motor fins along a radial direction of the rotation shaft corresponding to the protrusion portion, the first vertical wall and the second vertical wall respectively attach the protrusion portion to form a first heat dissipation passage, a second heat dissipation passage being defined through the protrusion portion, an internal surface of the second heat dissipation passage being flat and the second heat dissipation passage being communicated with the first heat dissipation passage;
• a cap receiving the rotation shaft, the cap covers an end surface of the casing, the cap has a conical extending portion converged from the end surface toward the rotation shaft and a receiving portion connected to the conical extending portion, the receiving portion being cylindrical and the rotation shaft is outward protruded from an end surface of the receiving portion;
• a fan arranged on the rotation shaft and outside of the cap;
• an inverter disposed on an external surface of the protrusion portion, the inverter including a motor control circuit board;
• and
• a heat transfer module disposed corresponding to the motor control circuit board and thermally connected to the motor control circuit board, the heat transfer module includes an installation base, a thermal conductive base and a heat diffusion assembly, the installation base being of a U shape, the installation base has two side surfaces respectively attaching the protrusion portion and the frame, the installation base and the frame laterally cover the receiving portion and the conical extending portion according to the radial direction of the rotation shaft, a first air compressing passage being formed by the frame and a part of external surfaces of the conical extending portion and the receiving portion covered by the frame, the first air compressing passage being communicated to the first heat dissipation passage, the thermal conductive base being arranged in the installation base and partially coves the receiving portion, the thermal conductive base has a plurality of first fins upright extended and arranged at interval, a second air compressing passage being formed by the installation base and another part of external surfaces of the conical extending portion and the receiving portion covered by the installation base, the second air compressing passage being communicated to the second heat dissipation passage, a containing volume of the first air compressing passage being larger than a containing volume of the second air compressing passage, the heat diffusion assembly being clamped between the installation base and the thermal conductive base, and the heat diffusion assembly transfers heat to the first fins from the motor control circuit board
• wherein an airflow is driven by the fan, the airflow cools the motor fins and the motor body when flows through the first air compressing passage into the first heat dissipation passage, the airflow cools the first fins and the motor body when flows through the second air compressing passage into the second heat dissipation passage.