Motor assembly and electrical device comprising the same

A motor assembly, comprising:

• a motor, the motor comprising a housing, a stator assembly, a rotating shaft, and a rotor assembly;
• and
• a control circuit board, the control circuit board comprising a first electric wire, a second electric wire, a detection wire, a ground wire, a power supply circuit, a control circuit, and a detection circuit;
• wherein:
• one end of the first electric wire and one end of the second electric wire are adapted to be connected to a commercial AC electric supply, and the other end thereof connected to input ends of the power supply circuit;
• the power supply circuit supplies a DC voltage to electrical parts of the control circuit board;
• the detection circuit is disposed between the detection wire and the ground wire to detect whether or not a load connected to the motor is electrified;
• and
• the detection wire transmits a detection signal to the control circuit, and the control circuit controls the motor to rotate in various rotation speeds.