ULTRASONIC SENSOR FOR A MOTOR VEHICLE

The invention relates to an ultrasonic sensor (1) for a motor vehicle (80). The ultrasonic sensor (1) comprises: a housing assembly (5), an ultrasonic membrane (2) disposed in an opening in the housing assembly (5), an acoustic transducer element (3) attached to the ultrasonic membrane (2) from the inside and a circuit board (6) which is disposed in the housing assembly (5) and on which a driver circuit (9) for the acoustic transducer element (3) is mounted, the driver circuit (9) having a transformer element (11). The housing assembly (5) of the ultrasonic sensor (1) has a compensating winding (16) which is disposed axially parallel to a functional winding (15) of the transformer element (11) and is connected in series with the functional winding (15) of the transformer element (11). A winding direction of the compensating winding (16), a winding direction of the functional winding (15) of the transformer element and a polarity of the series connection are designed in such a way that currents of opposite polarity can be induced in the compensating winding (16) and in the functional winding (15).