Abstract: A method of allocating computer addresses between units of an industrial installation connected to a local communications architecture and using the IP, TCP, and UDP protocols. The method provides the following steps: a unit broadcasts a request frame including a UDP port address specific to the unit, a UDP port address of an address allocation unit, and an address request; the allocation unit takes the request into account on recognizing its own port address; the allocation unit broadcasts a frame including its own IP address and the UDP port address of the requesting unit; the IP address of the allocation unit is taken into account by the requesting unit on recognizing its own port address; and the requesting unit determines its IP address by substituting its own hardware address for the hardware address of the allocation unit in its IP address.

Abstract: A method of controlling the torque of a rotary machine powered by means of an inverter and servo-controlled by a system having sensors, an observer, and a computer which delivers controls to the switches of the inverter on the basis of values supplied to the observer by the sensors, in the form of sequences of three vectors to bring the torque &Ggr; and the stator flux &PHgr;S of the machine towards reference values for &Ggr;ref and &PHgr;Sref. The measurement sampling period is selected to be equal to the sequence period DTML which corresponds to half the switching period of the inverter.