Brushless motor assembly

A brushless motor assembly, comprising:

• a motor body comprising a stator core, a front cover, and a rear cover, wherein the front cover and the rear cover are disposed at two opposite ends of the stator core in an axial direction of the stator core;
• a circuit board having a mounting surface and a plurality of solder holes, and including a motor control unit and at least two power switches, wherein the motor control unit and the at least two power switches are both disposed on the mounting surface, wherein the motor control unit is configured to control an operation of the at least two power switches;
• and
• a heat sink disposed between the motor body and the circuit board, wherein the heat sink has a first side portion and a second side portion, and the first side portion and the second side portion face opposite directions;
• the first side portion faces the motor body, and the second side portion faces the circuit board and shields the mounting surface of the circuit board;
• wherein the mounting surface of the circuit board faces the second side portion of the heat sink;
• the heat sink is connected to both the front cover and the rear cover, and is located on a side of the stator core in a radial direction of the stator core, and is spaced apart from the stator core with a gap;
• the heat sink has a slot allowing the first side portion to communicate with the second side portion;
• the second side portion of the heat sink is formed with at least two protruded parts located on two sides of the slot, wherein the plurality of solder holes directly face the slot, and the at least two protruded parts directly face the at least two power switches.