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AssigneeMannesmann VDO AG
InventorKlaus Kronenberg
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A method for monitoring the speed of a synchronous motor, the synchronous motor having a permanent magnet rotor (3) and coils (1, 2), sinusoidal currents being applied to the coils (1, 2). Also a device for monitoring the speed of such a motor, wherein in at least one of the coils (1, 2) the power supply is disconnected and one or more voltage characteristics (U1, U2) are evaluated which are induced by the permanent magnet rotor (3) in one or more of the coils (1, 2) disconnected from the power supply, the minimum duration of the interruption of the power supply of the coils (1, 2) and the evaluation of the voltage characteristic (U1, U2) being equal to the temporal spacing between two consecutive zero crossings of the respectively induced voltage characteristics (U1, U2).
A method for monitoring the speed of a synchronous motor, the synchronous motor having a permanent magnet rotor and two coils to which sinusoidal currents are applied, and the angular distance of the sinusoidal currents from one another corresponding to the angular distance of the coils from one another, wherein in at least one of the coils the power supply is disconnected for an interval of time having a duration equal to at least one-half period of the sinusoidal currents, and wherein one or more voltage characteristics are evaluated based on a temporal spacing between two consecutive zero-crossings of a voltage induced by the permanent magnet rotor in one or more of the coils disconnected from the power supply, that minimum duration of the interruption of the power supply of the coils and the evaluation of the voltage characteristic being equal to the temporal spacing between two consecutive zero crossings of the respectively induced voltage characteristics.
A device for monitoring the speed of a synchronous motor which has a permanent magnet rotor and two coils which can be supplied with sinusoidal currents by a power supply unit, the device having a switch and an evaluation circuit, wherein the power supply of at least one of the coils can be disconnected by the switch for an interval of time having a duration equal to at least one-half period of the sinusoidal currents, it being possible to determine the speed of the permanent magnet rotor, in the evaluation circuit, by evaluating the voltage characteristics which are induced by the permanent magnet rotor in the coils disconnected from the power supply based on a temporal spacing between two consecutive zero-crossings of a voltage.
A method for monitoring the speed of a synchronous motor, the synchronous motor having a permanent magnet rotor and two coils to which sinusoidal currents are applied, and the angular distance of the sinusoidal currents from one another being 90° and corresponding to the angular distance of the coils from one another, wherein in at least one of the coils the power supply is disconnected and one or more voltage characteristics are evaluated which are induced by the permanent magnet rotor in one or more of the coils disconnected from the power supply, that minimum duration of the interruption of the power supply of the coils and the evaluation of the voltage characteristic being equal to or greater than the temporal spacing between two consecutive zero crossings of the respectively induced voltage characteristics.
A device for monitoring the speed of a synchronous motor which has a permanent magnet rotor and two coils to be supplied with sinusoidal currents shifted in phase by 90° by a power supply unit, the device including circuitry for disconnecting power from at least one of the coils over an interval of time equal to or greater than a temporal spacing between two consecutive zero crossings of the voltage characteristics induced by the permanent magnet in the at least one coil, and an evaluation circuit serving to determine the speed of the permanent magnet by evaluating the voltage characteristics which are induced by the permanent magnet rotor in the at least one coil disconnected from the power supply.
Dependencies are inferred from the claim text.