Abstract: A variable air compressor assembly is provided for selectively generating compressed air using a compressor driven by an electric motor. The assembly includes a controller, an air intake, the compressor, the electric motor, a belt drive assembly, an air outlet, a power source, and a device application. The device application receives sensor data from an RPM sensor, a motor load sensor, a pressure sensor, and an air flow sensor, and generates a control signal to regulate operation of the compressor, the electric motor, and the belt drive assembly according to a power management system. This configuration enables adjustment of motor speed and torque to achieve desired air pressure and flow characteristics.