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US 5,434,491 AGranted
Electronic device for starting a synchronous motor with permanent-magnet rotor
AssigneeAskoll S.p.A.
InventorElio Marioni
Life of this patent
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Abstract
Device for starting a synchronous motor with a permanent-magnet rotor, particularly with two stator poles and two rotor poles, including a static power switch, a triac, arranged in series between the stator winding of the motor and the alternating-voltage source at mains frequency. The triac is controlled by an electronic circuit which processes three factors, namely the current flowing through the coil of the synchronous motor, the position and polarity of the permanent magnet of the rotor, and the polarity of the alternating-voltage source.
Claims9
Electronic device for starting a synchronous motor with a permanent-magnet rotor, comprising:
- at least one static switch arranged in series with at least one stator winding of said synchronous motor;
- an alternating current voltage source connected in series with said motor;
- position sensing means adapted to detect the position of the rotor of said motor;
- a phase-shift means connected to said position sensing means;
- an XOR gate whose inputs are the output of said phase-shift means and said alternating current voltage source;
- wherein said static switch is driven by the output of said XOR gate.
3 more elements
Dependencies are inferred from the claim text.