Abstract: An impeller blade structure includes a main body having a first through opening communicating a first side with an opposite second side of the main body. The main body is formed on the first side with angularly spaced block-like blades, which respectively include a first end contacting or not contacting with the first through opening, an opposite second end, and a first coupling section. Any two adjacent blades together define between them a passage. When a virtual line tangentially passes through a point on a circumference of the main body that is corresponding to one radially outer end of the blade, an acute included angle will be defined between the virtual line and the blade. With these arrangements, the blades produce less noise and are more durable for use when the impeller blade structure rotates. A rotor assembly including the impeller blade structure is also disclosed.

Abstract: An impeller blade structure includes a main body having a first through opening communicating a first side with an opposite second side of the main body. The main body is formed on the first side with angularly spaced block-like blades, which respectively include a first end contacting or not contacting with the first through opening, an opposite second end, and a first coupling section. Any two adjacent blades together define between them a passage. When a virtual line tangentially passes through a point on a circumference of the main body that is corresponding to one radially outer end of the blade, an acute included angle will be defined between the virtual line and the blade. With these arrangements, the blades produce less noise and are more durable for use when the impeller blade structure rotates. A rotor assembly including the impeller blade structure is also disclosed.