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US 7,746,064 B2Granted
Speed measurement for an electrical permanent-magnet synchronous machine
AssigneeSiemens Aktiengesellschaft
InventorsMarkus Knorr, Zeljko Jajtic
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AssigneeSiemens Aktiengesellschaft
InventorsMarkus Knorr, Zeljko Jajtic
Estimating the term…
The invention relates to a speed measurement device (1, 2) for a permanently excited electric synchronous machine (5, 7) comprising a first part (11, 13) and a second part (15, 17). The invention also relates to a corresponding method for measuring speed. The second part (15, 17) of the permanently excited electric synchronous machine comprises permanent magnets (19). The speed measurement device (1, 2) comprises at least one first sensor (25) and a second sensor (31), wherein the first sensor (25) is provided with a sensor coil and the second sensor (31) is a Hall sensor and the sensors (25, 31) on the first part (11, 13) are arranged in such a way that the first sensor (25) and second sensor (31) are influenced by a magnetic field (33), which is generated by the permanent magnets (19), by means of a flow conducting device (43) having an integrated character.
A speed measurement device for an electrical machine, which has a primary part, a secondary part, and permanent magnets said speed measurement device comprising:
A speed measurement assembly for a permanent-magnet electrical synchronous machine which has a primary part and a secondary part, said speed measurement assembly comprising an evaluation device, and two speed measurement devices operatively connected to the evaluation device, each speed measurement device including a first sensor having a sensor coil which generates a first signal value having a position-dependent component and a speed-dependent component, a second sensor constructed as a Hall sensor to generate a position-dependent second signal value to eliminate the position-dependent component of the sensor coil, and a flux guidance device for guidance of a magnetic flux, wherein at least one of the first and second sensors is arranged in an area of the flux guidance device and configured to measure the magnetic flux in the flux guidance device, wherein one of the speed measurement devices is constructed for attachment in and/or to the primary part with an electrical phase offset from the other one of the speed measurement devices, wherein the evaluation device relates the first signal value to the second signal value of each of the speed measurement devices, wherein a ratio between the first signal value and the second signal value is proportional to the speed of the machine.
A primary part of a permanent-magnet electrical synchronous machine, comprising:
A method for measurement of a speed of a machine, said method comprising the steps of:
Dependencies are inferred from the claim text.