A screening system for a magnetic rotary-encoder sensor system in an environment of a machine including a magnetic noise field, wherein the rotary-encoder sensor system comprises a magnetic sensor, a pole wheel, and preferably a pole-wheel carrier, wherein the pole wheel comprises in a circumferential direction a plurality of permanent magnets of alternating magnetic polarity generating a useful field, wherein the pole-wheel carrier is configured to be mounted in a rotationally-fixed manner to a rotating machine shaft extending axially, rotational speed and/or angular position of which is to be determined by means of the rotary-encoder sensor system, wherein the magnetic sensor is positioned, in a mounted state of the rotary-encoder sensor system relative to the machine shaft, in a rotational plane of the pole wheel, which can affect the noise field, and directly opposite to the pole wheel, wherein the screening system comprises at least one magnetically conducting, preferably machine-fixed, deflection element being formed and dimensioned such that in the mounted state a measuring volume, which is substantially free of the noise field, is established, to which the magnetic sensor, and such ones of the permanent magnets are at least adjacent which are required for generating an evaluable useful field, when the noise field is active.

A screening system for a magnetic rotary-encoder sensor system in an environment of a machine including a magnetic noise field, wherein the rotary-encoder sensor system comprises a magnetic sensor, a pole wheel, and preferably a pole-wheel carrier, wherein the pole wheel comprises in a circumferential direction a plurality of permanent magnets of alternating magnetic polarity generating a useful field, wherein the pole-wheel carrier is configured to be mounted in a rotationally-fixed manner to a rotating machine shaft extending axially, rotational speed and/or angular position of which is to be determined by means of the rotary-encoder sensor system, wherein the magnetic sensor is positioned, in a mounted state of the rotary-encoder sensor system relative to the machine shaft, in a rotational plane of the pole wheel, which can affect the noise field, and directly opposite to the pole wheel, wherein the screening system comprises at least one magnetically conducting, preferably machine-fixed, deflection element being formed and dimensioned such that in the mounted state a measuring volume, which is substantially free of the noise field, is established, to which the magnetic sensor, and such ones of the permanent magnets are at least adjacent which are required for generating an evaluable useful field, when the noise field is active.

To improve the EMC performance of an electronic device on which a motor is mounted. A circuit board (12) comprises a substrate (130), lands (P4, P5) that are formed on a main surface (131) of the substrate (130) and are for connecting a coil (17) of the motor (11), a magnetic detection element (122) that outputs a detection signal corresponding to a position of a rotor (14) of the motor (11), and a motor drive control IC (121) that generates drive signals (VOUTA, VOUTB) for driving the motor (11) based on the detection signal, wherein the magnetic detection element (122) and the motor drive control IC (121) are arranged in a region (AR1) on a side of a minor angle (θ) formed by a first straight line (a) and a second straight line (b) among regions that are on the main surface and are defined by the first straight line and the second straight line when viewing the substrate (130) from the main surface side, the first straight line connecting the land (P4) and an axis of an output shaft of the motor (11), the second straight line connecting the land (P5) and the axis of the motor (11).

To improve the EMC performance of an electronic device on which a motor is mounted. A circuit board (12) comprises a substrate (130), lands (P4, P5) that are formed on a main surface (131) of the substrate (130) and are for connecting a coil (17) of the motor (11), a magnetic detection element (122) that outputs a detection signal corresponding to a position of a rotor (14) of the motor (11), and a motor drive control IC (121) that generates drive signals (VOUTA, VOUTB) for driving the motor (11) based on the detection signal, wherein the magnetic detection element (122) and the motor drive control IC (121) are arranged in a region (AR1) on a side of a minor angle (θ) formed by a first straight line (a) and a second straight line (b) among regions that are on the main surface and are defined by the first straight line and the second straight line when viewing the substrate (130) from the main surface side, the first straight line connecting the land (P4) and an axis of an output shaft of the motor (11), the second straight line connecting the land (P5) and the axis of the motor (11).

A motor improves the accuracy of position estimation of a rotor. The rotor in the motor includes a rotor core containing a magnetic material, magnets on the rotor core in a rotation direction of the rotor, and Hall devices on a mounting surface to detect a magnetic field from the magnets. The magnets each have a facing surface facing the mounting surface at a constant distance. The rotor core has a facing surface facing the mounting surface and has at least one first area and at least one second area with different distances between the facing surface and the mounting surface and located alternately in the rotation direction. The first area and the second area include one or more area pairs each including a first area and a second area adjacent to each other. The number of area pairs is determined by the number of pole pairs of the magnets.

There is provided a motor having a sensor disposable at a desired position. The motor comprises a frame (11), a rotor, a stator, a substrate (40) provided in the stator, and a sensor (53) provided at the substrate (40). The substrate (40) includes a surface facing the rotor, and an outer peripheral portion (41). In the outer peripheral portion (41) of the substrate (40), a contact portion (49) contacting an inner peripheral portion (11a) of the frame (11) is provided. In the inner peripheral portion (11a) of the frame (11), contacted portions (11j), (11k) contacting the outer peripheral portion (41) of the substrate (40) are provided. In at least one of the contact portion (49) and the contacted portion (11j), (11k), a projecting portion (49j), (49k) projecting toward another of the contact portion and the contacted portion is provided.

A resolver excitation output stage amplifier. Disclosed embodiments comprise an amplifier stage and a current protection circuit. The amplifier stage includes one or more amplifier transistors coupled to first and second supply terminals, a timing control terminal and an excitation signal output terminal. The amplifier stage is configured to provide a resolver excitation signal having the excitation frequency at the excitation signal output terminal. The current protection circuit includes one or more protection transistors coupled to the amplifier stage and configured to turn off the one or more transistors of the amplifier stage when current through the one or more transistors of the amplifier stage is greater than a predetermined current value.

A resolver excitation output stage amplifier. Disclosed embodiments comprise an amplifier stage and a current protection circuit. The amplifier stage includes one or more amplifier transistors coupled to first and second supply terminals, a timing control terminal and an excitation signal output terminal. The amplifier stage is configured to provide a resolver excitation signal having the excitation frequency at the excitation signal output terminal. The current protection circuit includes one or more protection transistors coupled to the amplifier stage and configured to turn off the one or more transistors of the amplifier stage when current through the one or more transistors of the amplifier stage is greater than a predetermined current value.

The present disclosure provides a motor drive device. The motor drive device includes a terminal, a logic unit, a drive unit and a determination unit. The terminal is configured to receive a Hall signal output from a Hall sensor. The logic unit is configured to generate a control signal based on the Hall signal. The drive unit is configured to generate a driving signal based on the control signal. The determination unit is configured to determine a level of a voltage applied to the terminal. The logic unit is configured to switch a function setting based on a determination result of the determination unit.

The present disclosure provides a motor drive device. The motor drive device includes a terminal, a logic unit, a drive unit and a determination unit. The terminal is configured to receive a Hall signal output from a Hall sensor. The logic unit is configured to generate a control signal based on the Hall signal. The drive unit is configured to generate a driving signal based on the control signal. The determination unit is configured to determine a level of a voltage applied to the terminal. The logic unit is configured to switch a function setting based on a determination result of the determination unit.