Abstract: The invention relates to an electric household food preparation appliance comprising a control/command device consisting of: means for evaluating the load or resisting torque (C1, C2, C3) applied to the motor; and means for automatically switching the operation of the appliance from a first mode to a second mode when the load drops below a first predetermined threshold (SB), the operating speed of the appliance decreasing when the load drops from a value greater than the first threshold (SB) to a value lower than the first threshold (SB). According to the invention, the control/command device of the appliance comprises means for automatically switching the operation of the appliance from the second mode to the first mode when the aforementioned load rises above a second predetermined threshold (SH), the operating speed of the appliance increasing when the load rises from a value lower than the second threshold (SH) to a value greater than the second threshold (SH).

Abstract: Domestic electrical appliance, including a universal electric motor powered by direct current via an electrical circuit linked to a DC electrical voltage source, said circuit including a chopper arrangement, including a capacitor in parallel with the DC voltage source, and one or more solid-state switches, wherein the circuit also includes two controllable switches, for automatically reconfiguring said circuit: a first switch, connected on the one hand, to a first terminal of a motor winding, and on the other hand, alternately to the DC voltage source and to the first terminal of the motor rotor; a second switch, connected on the one hand, to the second terminal of said motor winding, and on the other hand, alternately to one or to the other of the terminals of the motor rotor.

Abstract: Domestic electrical appliance, including a universal electric motor powered by direct current via an electrical circuit linked to a DC electrical voltage source, said circuit including a chopper arrangement, including a capacitor in parallel with the DC voltage source, and one or more solid-state switches, wherein the circuit also includes two controllable switches, for automatically reconfiguring said circuit: a first switch, connected on the one hand, to a first terminal of a motor winding, and on the other hand, alternately to the DC voltage source and to the first terminal of the motor rotor; a second switch, connected on the one hand, to the second terminal of said motor winding, and on the other hand, alternately to one or to the other of the terminals of the motor rotor.

Abstract: A process for supplying a polyphase motor with electronic switching (M) from a voltage supply source (A), includes a passive electric filter downstream of the supply source (A), a conversion of the voltage supplied by the source (A) to supply the phases of the motor (M), using an assembly of controllable switches having either a passing condition or blocking condition, where each combination of conditions of the switches defines a conversion configuration. The process regulates the supply current about a reference current (Iref), and a sequence of magnetization and de-magnetization cycles of the phases of the motor (M) initiated by magnetization or de-magnetization references of the phases. During at least one period of sequencing per cycle, several pairs of conversion configurations are selected so that the mean current conforms as close as possible to the reference current (Iref).

Abstract: A method for powering an electronically switched variable reluctance motor (100) from a single-phase AC voltage source (17) is disclosed. Each phase of the motor is sequentially subjected to a magnetizing sequence, a demagnetizing sequence and an energy transfer to a storage capacitor (C) common to all the phases. Feedback sequences (R) in which the energy stored in the storage capacitor (C) is returned to the rectifier stage (15) are performed by controlling a chopping switch (TH) connected in series to the storage capacitor (C). The method includes a step of monitoring the energy returned to the rectifier stage (15) in order to correct instability in the rectified power supply current (Ia) relative to a reference current wave, and modulating the cyclical chopping ratio around a substantially constant mean value. The method is useful for powering household appliances.

Abstract: A method for powering an electronically switched variable reluctance polyphase electric motor from a rectified voltage source, including for each phase, magnetizing sequences during which the rectified voltage is applied to each phase and demagnetizing sequences during which the inverse of the rectified voltage is applied to each phase. The method further includes sensing disturbances in the current from the rectified voltage source and in response thereto, free-wheel sequences during which the magnetic energy currently stored in at least one of the phase is substantially maintained therein.

Abstract: A method for controlling the power of a load (1) powered from a source of AC voltage U having a period T using a phase control system, wherein, for a predetermined set power, a sequence of an integer p of elements, where p is greater than 1, is periodically delivered to the load (1), each element, numbered i, of the sequence being characterized by an integer n.sub.i with a half-period T/2 during which the AC voltage U is switched according to a series of different phase angles .alpha..sub.i from .alpha..sub.1 to .alpha..sub.n corresponding to respective durations t.sub.i from t.sub.l to t.sub.n during which the load (1) is cut: off from the power supply. The phase angles .alpha..sub.i of element i and .alpha..sub.i+1 of element i+1 have similar repetitive values so that the mean current is zero over a complete cycle.

Abstract: A system controls a one-pole synchronous motor, with a magnetized rotor and a stator provided with two pairs of coils. The motor includes a floating common node to which are connected first coil terminals, the second terminal of each first coil of a coil pair is connected to a first supply terminal through a first respective switch, and the second terminal of each second coil of a coil pair is connected to a second supply terminal through a second respective switch. The control system includes a circuit operable for controlling switches in a stepping or self-switching mode, and at least one detection circuit using the voltage occurring at the floating common node so as to detect at least one operation condition of the motor.