Electrical machine for a motor vehicle, comprising a piezoelectric roller
AssigneeAUMOVIO Germany GmbH
InventorsBertrand VAROQUIE, Eric SENECHAL
Life of this patent
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Abstract
An electrical machine for a motor vehicle, including a stator and a rotor mounted on the stator such that it is able to rotate by a rotation shaft and a plurality of rolling modules. At least one rolling element of at least one rolling module includes a “main” piezoelectric transceiver configured to transmit an ultrasonic supply signal, the electrical machine including a sensor mounted inside the rotor.
Claims9
An electrical machine for a motor vehicle, said electrical machine comprising a stator and a rotor mounted on said stator such that it is able to rotate by a rotation shaft and a plurality of rolling modules, each rolling module comprising a fixed element mounted on the stator, a movable element mounted on the rotor, at least one rolling element mounted between the fixed element and the movable element and configured to allow the rotor to rotate relative to the stator, the electrical machine further comprising:
- at least one rolling element of at least one rolling module is a “main” piezoelectric transceiver configured to transmit an ultrasonic supply signal,
- the stator comprises a control stage configured to command said main piezoelectric transceiver to transmit,
- the electrical machine comprises a sensor, mounted inside the rotor, comprising a “remote” piezoelectric transceiver, a measurement stage and a sensitive element, said remote piezoelectric transceiver being configured to receive the ultrasonic supply signal and to transmit it to the measurement stage, the measurement stage being configured to collect and store the electrical energy contained in the received ultrasonic supply signal and to electrically power the sensitive element on the basis of the stored electrical energy, the sensitive element being configured to measure a parameter inside the rotor, to generate a measurement signal including at least one value of the measured parameter and to transmit said generated measurement signal to the measurement stage, the measurement stage being configured to extract the at least one value of the measured parameter contained in the measurement signal, to generate an ultrasonic response signal including the at least one extracted value of the parameter, and to command the remote piezoelectric transceiver to transmit said generated ultrasonic response signal, the main piezoelectric transceiver being configured to receive said ultrasonic response signal and to transmit said received ultrasonic response signal to the control stage, said control stage being configured to extract the at least one value of the parameter contained in the transmitted ultrasonic response signal.
A method for measuring a parameter in a rotor of an electrical machine of a motor vehicle, said method comprising:
- commanding, by the control stage, the main piezoelectric transceiver to transmit,
- transmission, by the main piezoelectric transceiver, of an ultrasonic supply signal,
- reception, by the remote piezoelectric transceiver, of the transmitted ultrasonic supply signal,
- collection and storage, by the measurement stage, of the electrical energy contained in the received ultrasonic supply signal,
- electrical powering, by the measurement stage, of the sensitive element on the basis of the stored electrical energy,
- measurement, by the sensitive element, of the parameter,
- generation, by the sensitive element, of a measurement signal including at least one value of the measured parameter,
- transmission, by the sensitive element, of the generated measurement signal to the measurement stage,
- extraction, by the measurement stage, of the at least one value of the measured parameter contained in the transmitted measurement signal,
- generation, by the measurement stage, of an ultrasonic response signal including the at least one extracted value of the parameter,
- commanding, by the measurement stage, the remote piezoelectric transceiver to transmit said generated ultrasonic response signal,
- transmission, by the remote piezoelectric transceiver, of said generated ultrasonic response signal,
- reception, by the main piezoelectric transceiver, of the transmitted ultrasonic response signal,
- transmission, by the main piezoelectric transceiver, of the received ultrasonic response signal to the control stage,
- extraction, by the control stage, of the at least one value of the parameter contained in the transmitted ultrasonic response signal.
Dependencies are inferred from the claim text.