Speed changing device for a multi-polar, constant flux electric motor, and a motorized ventilating fan unit equipped with such a device
AssigneeValeo Thermique Moteur
InventorMarcel Msihid
Life of this patent
Estimating the term…
Abstract
This invention relates to a speed changing device, giving at least two motor speeds, for an electric motor supplied with direct current. It is applicable to motorized ventilating fan units designed for the air cooling of heat engines, mainly for automobiles. The speed changing device is characterized in that it includes a contactor having at least two positions whereby, in the first position of the contactor, not more than three of the brushes are supplied with electrical current so as to obtain a first motor speed (low speed), while in the second position of the contactor, all of the brushes are supplied with electrical current so as to obtain the greater motor speed (high speed).
Claims13
A speed changing device for an electric motor for a motorised ventilating fan unit, the motor having an encapsulated winding and at least four brushes for supplying electric current to said winding, the motor being arranged to operate at at least two different speeds, the speed changing device comprising:
- a first contactor having at least two positions including a first position and a second position, the speed changing device having means for connecting it electrically with selected brushes of the motor whereby in said first position of the first contactor no more than three of the brushes are supplied with electric current, so as to obtain a first motor speed, and in said second position of the first contactor, all the brushes are supplied with electric current in order to obtain a greater motor speed, and means for supplying a signal representing thermal enviromental conditions to at least one contactor of the device.
A motorised ventilating fan unit comprising:
- a constant flux DC voltage operable motor with armature windings and first, second, third and fourth brushes spaced 90 degrees apart for commutating said brushes to the armature windings, at least one DC voltage applied to the first of the brushes;
- and
- two position speed changing means for applying another DC voltage to the second of the brushes in a first position to operate the motor at a first speed and for applying said one voltage to the third of the brushes and said another voltage to the fourth of the brushes in a second position to operate the motor at a second speed.
A motorised ventilating fan unit comprising:
- a constant flux DC voltage operable motor with armature windings and first, second, third and fourth brushes spaced 90 degrees apart for commutating said brushes to the armature windings, at least one DC voltage applied in parallel to the first and third of the brushes;
- and
- two position speed changing means for applying another DC voltage to only the second of the brushes in a first position to operate the motor at a first speed and for applying in addition said another voltage to the fourth of the brushes in a second position to operate the motor at a second speed.
Dependencies are inferred from the claim text.