Abstract: Electric motor for driving members that rotate at speeds of greater than 40,000 revolutions per minute, includes a stator housing induction coils, a rotor supporting multiple permanent magnets and located coaxially inside the stator, and multiple Hall sensors integral with the stator and capable of detecting the position of one or more points on the rotor as it rotates in order appropriately to time the injection of the induction currents into the coils as a function of the position of the permanent magnets. The motor includes elements for deactivating all but one of the Hall sensors when the rotor speed of oration exceeds 40,000 revolutions/mm, elements for measuring the rotor speed of rotation as it describes each n-th revolution; and elements for bringing about in the next or (n+1) th revolution of the rotor the injection of the currents into the coils.

Abstract: Electric motor for driving members that rotate at speeds of greater than 40 000 revolutions per minute, includes a stator housing induction coils, a rotor supporting multiple permanent magnets and located coaxially inside the stator, and multiple Hall sensors integral with the stator and capable of detecting the position of one or more points on the rotor as it rotates in order appropriately to time the injection of the induction currents into the coils as a function of the position of the permanent magnets.

Abstract: A multi-phase linear motor includes a number of magnets side by side with multiple phase coils in which alternating currents that are offset by a predetermined value are made to flow. The interaction between the magnets and the phase coils causes a relative linear displacement of magnets with respect to the phase coils. In the linear motor in question, the phase coils lie on an axis that is perpendicular to the direction of motion.

Abstract: An array (10) contains a rotary electromagnetic motor (11) and/or a linear electromagnetic motor (12) that is (are) attached to a tool-carrying sleeve (19) of a machine tool that carries out high-speed working in order to draw off shavings, in which magnets (13, 14i) of the motor(s) are integral with the tool-carrying sleeve (19) itself. In the array (10) magnets (13, 14i) are made integral with the tool-carrying sleeve (19) by a hollow tube (15) that is attached coaxially to the tube on an inside wall (15g) where the magnets are attached coaxially. The array (10) also contains a hollow shaft (16) that is fixed in place while the array (10) is in operation and is inserted coaxially into the hollow tube (15). A number of stator induction coils (17) that interact with the magnets (13, 14i) are arranged on an outer surface of the hollow shaft, and coaxially with respect to the hollow tube.

Abstract: A multi-phase linear motor (1) that comprises a number of magnets (2i) side by side with multiple phase coils (3i) in which alternating currents that are offset by a predetermined value are made to flow, whereby the interaction between said magnets (2i) and said phase coils (3i) causes a relative linear displacement of magnets (2i) with respect to phase coils (3i). In the linear motor in question, said phase coils (3i) lie on an axis (L) that is perpendicular to the direction of motion.

Abstract: An array (10) contains a rotary electromagnetic motor (11) and/or a linear electromagnetic motor (12) that is (are) attached to a tool-carrying sleeve (19) of a machine tool that carries out high-speed working in order to draw off shavings, in which magnets (13, 14i) of the motor(s) are integral with the tool-carrying sleeve (19) itself. In the array (10) magnets (13, 14i) are made integral with the tool-carrying sleeve (19) by a hollow tube (15) that is attached coaxially to the tube on an inside wall (15g) where the magnets are attached coaxially. The array (10) also contains a hollow shaft (16) that is fixed in place while the array (10) is in operation and is inserted coaxially into the hollow tube (15). A number of stator induction coils (17) that interact with the magnets (13, 14i) are arranged on an outer surface of the hollow shaft, and coaxially with respect to the hollow tube.