A cooling arrangement for electric machines where cooling plates are maintained against the inner surface of the stator and are interconnected by a cooling tube that carries the stator generated heat outside of the machine. The chipping system has chipping tools that form a circular or ring-shaped chipping zone. A second noise spectrum estimator estimates the noise spectrum based on the input signal regardless of the detection result of the audio detector. The tool load device provides an improved method of moving containers between a conventional load port and, for example, a conveyor.