Koninklijke Philips Corporation N.V.

Wessel Adolf Otten

Johannes Tseard Van Der Kooi

Wilhelmus Ettes

A motor control circuit (MC) comprising input terminals (IT, IT) to receive a rectified input voltage (Vrm), and output terminals (OT, OT) to supply a motor drive signal (Vm). A switching circuit () is alternately in an on-state (Ton) and an off-state (Toff) for intermittently coupling the input terminals (IT, IT) to the output terminals (OT, OT). A controller () controls the switching circuit () to be (i) in the on-state (Ton) during a first period in time (T) when an amount of magnetic saturation of the motor is smaller than a predetermined value, and (ii) alternately in the on-state (Ton) and the off-state (Toff) to obtain a pulse width control of the motor drive signal (Vm) during a second period in time (T) when the amount of magnetic saturation of the motor is larger than the predetermined value.

Controlling a power of an electrical motor

A method of manufacturing an electrical suction unit for use in a vacuum cleaner includes a turbine unit and an electrical motor with a rotor and a stator. The turbine unit is attached to the rotor and forms, together with the rotor, a rotatable part of the suction unit, which is rotatable about an axis of rotation. An amount of material is removed from the rotor and from the turbine unit to torque-balance the rotatable part of the suction unit. In this manner, the amount of material to be removed from the rotor to torque-balance the rotatable part is considerably reduced, so that the adverse influence of the removal of the material from the rotor on the performance of the electrical motor is limited.

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Drachten, Netherlands

Wessel Adolf Otten