Abstract: A dynamo is provided. The dynamo includes a rotor and a stator unit. The rotor includes a rotor body and a plurality of magnetic elements, wherein each two adjacent magnetic elements have different magnetic poles. The stator unit includes at least one stator, with the stator including a stator body, a plurality of slots and a plurality of amature windings, wherein the slots are formed on the stator body and face the rotor, the amature windings are wound on the slot, and the slots on the stator body are arranged in a curve and correspond to a portion of the circumferential region of the rotor.

Abstract: An electric vehicle includes a controlling device and a battery unit. The controlling device is connected to a switch, an electric motor, an accelerator controller, and a generator unit. The switch is connected to the generator unit. The battery unit includes a primary battery and a secondary battery. The primary battery is connected to the controlling device. The secondary battery is connected to the generator unit. When the switch is turned on, the controlling device and the generator unit are activated, and when the accelerator controller activates the generator unit via the generator unit controlling device, the controlling device firstly supplies power to the electric motor by the generator unit. After the electric motor has been started, the controlling device cuts off power supply from the generator unit to the electric motor, and the primary battery supplies power to the electric motor.

Abstract: A compressor device includes a compressor (1) and a motor (2). The compressor (1) includes a body (11). A transmission shaft (12) is mounted to a side of the body (11). The motor (2) includes a base (21). A stator (22) is mounted in the base (21). A rotor (23) is mounted in the stator (22). The rotor (23) is connected to the transmission shaft (12) of the compressor (1). The motor (2) is directly coupled to the compressor (1) to reduce the number of components, reducing the costs and the installation space.