摘要:
An impact tool control method and apparatus (200) and an impact tool (100) housing the same. Pulses of torque applied to a fastener by impact tool are measured. The duration and magnitude of the torque pulse are subtracted from a torque signal and the resulting difference is integrated over time to obtain a faster angular velocity signal. The angular velocity signal is integrated over time to obtain a displacement signal which can be converted to torque signal. The impact tool can be controlled based on the value of the torque signal.
摘要:
An impact tool control method and apparatus (200) and an impact tool (100) housing the same. Pulses of torque applied to a fastener by impact tool are measured. The duration and magnitude of the torque pulse are subtracted from a torque signal and the resulting difference is integrated over time to obtain a faster angular velocity signal. The angular velocity signal is integrated over time to obtain a displacement signal which can be converted to torque signal. The impact tool can be controlled based on the value of the torque signal.
摘要:
An speed sensor for a rotating shaft includes a plurality of magnetic portions on the shaft that output a magnetic field from each of the magnetic portions, wherein the magnetic portions are integrally formed in the shaft by magnetically polarizing the shaft material itself. At least one magnetic field sensor is positioned proximate to the shaft for detecting the magnetic field from each of the magnetic portions and for outputting a signal corresponding to the angular speed of the shaft as the shaft rotates. The signal is useful for calculating the angular speed of the shaft, and the calculated angular speed value is useful for things like adjusting the angular speed of the shaft, monitoring the performance of the system in which the shaft is used, and for other purposes.
摘要:
The present invention involves a method and apparatus for canceling the effects of magnetic field noise in a torque sensor by placing three sets of magnetic field sensors around a shaft, the first set of field sensors being placed in the central region of the shaft and the second and third sets of field sensors being placed on the right side and left side of the field sensors placed at the central region, respectively. A torque-induced magnetic field is not cancelled with this arrangement of field sensors but a magnetic near field from a near field source is cancelled.
摘要:
A magnetoelastic torque sensor (2) for providing an output signal (24) indicative of the torque applied to a member about an axially extending axis of the member (11), comprising a member which is unitary and of generally homogeneous chemical composition, the member comprising separate magnetically active (ABC) and magnetically substantially passive regions. A first magnetoelastically active region in the member is magnetically polarized in a single circumferential direction and possesses sufficient magnetic anisotropy to return the magnetization in the region, following the application of torque to the member, to the single circumferential direction when the applied torque is reduced to zero, whereby the magnetoelastically active region produces a magnetic field varying with the torque. Magnetic field sensors (6) are mounted proximate to the magnetoelastically active region and oriented with respect thereto to sense the magnitude of the magnetic field at the sensors and provide the output signal in response thereto. The magnetoelastically active region of the member is formed of a polycrystalline material wherein at least 50 % of the distribution of local magnetizations lie within a 90° quadrant symmetrically disposed around the single circular direction and has a coercivity sufficiently high to prevent irreversible loss of the magnitude of the circumferential polarization.
摘要:
A magnetoelastic torque sensor (2) for providing an output signal (24) indicative of the torque applied to a member about an axially extending axis of the member (11), comprising, a first magnetoelastically active region in the member, the region being magnetically polarized in a single circumferential direction and possessing sufficient magnetic anisotropy to return the magnetization in the region, following the application of torque to the member, to the single circumferential direction when the applied torque is reduced to zero, whereby the magnetoelastically active region produces a magnetic field varying with the torque. Magnetic field sensors are mounted proximate to the magnetoelastically active region (ABC) and oriented with respect thereto to sense the magnitude of the magnetic field at the sensors (6) and provide the output signal in response thereto (24). At least the magnetoelastically active region of the member is formed of a polycrystalline material wherein at least 50 % of the distribution of local magnetizations lie within a 90 °C quadrant symmetrically disposed around the single circular direction and having a coercivity sufficiently high that the field arising from the magnetoelastically active region does not magnetize regions of the member proximate to the magnetoelastically active region to give rise to parasitic magnetic fields which are of sufficient strength to destroy the usefulness, for torque sensing purposes, of the net magnetic field seen by the magnetic field sensor means.
摘要:
The invention relates to an object's state or properties being monitored, such as a lithium-iron-phosphate (LFP) or other type of electrical battery containing one or more LFP or other type of electrical battery cell within the battery, and one or more sensors for measuring the state or property of the object, such as the state of charge of the battery cells, by measuring the magnetic susceptibility or other properties, such as the magnetic susceptibility of electrolyte or the electrodes within the battery cells. The state of charge of the battery cells within the battery are monitored by the one or more sensors, which are coupled to electrical circuits.
摘要:
A magnetoelastic torque sensor (2) for providing an output signal indicative of the torque transmitted between radially separated locations of a diskshaped member (10) includes a magnetoelastically active, ferromagnetic, magnetostrictive region which is magnetically polarized in a single circumferential direction and possesses sufficient magnetic anisotropy to return the magnetization in the region, following the application of torque to the member, to the single circumferential direction when the applied force is reduced to zero. First and second torque transmitting elements are directly attached to or form a part of the member at its central axis of rotation and its periphery in such a manner that torque is proportionally transmitted between the member and the transmitting elements. Magnetic field sensor means are mounted proximate (26, 28) to the member to sense the magnitude of the magnetic field produced by the member in response to the torque which is radially transmitted through the member between the first and second transmitting elements. The member is preferably formed of a polycrystalline material wherein at least 50 % of the distribution of local magnetizations lie within a 90° quadrant symmetrically disposed around the single circular direction and has a coercivity sufficiently high that the field arising from the member does not magnetize proximate regions of the member to give rise to parasitic magnetic fields which are of sufficient strength to destroy the usefulness, for force sensing purposes, of the net magnetic field seen by the magnetic field sensor means.
摘要:
A magnetoelastic torque sensor (2) for providing an output signal (24) indicative of the torque applied to a member about an axially extending axis of the member (11), comprising, a first magnetoelastically active region in the member, the region being magnetically polarized in a single circumferential direction and possessing sufficient magnetic anisotropy to return the magnetization in the region, following the application of torque to the member, to the single circumferential direction when the applied torque is reduced to zero, whereby the magnetoelastically active region produces a magnetic field varying with the torque. Magnetic field sensors are mounted proximate to the magnetoelastically active region (ABC) and oriented with respect thereto to sense the magnitude of the magnetic field at the sensors (6) and provide the output signal in response thereto (24). At least the magnetoelastically active region of the member is formed of a polycrystalline material wherein at least 50 % of the distribution of local magnetizations lie within a 90 °C quadrant symmetrically disposed around the single circular direction and having a coercivity sufficiently high that the field arising from the magnetoelastically active region does not magnetize regions of the member proximate to the magnetoelastically active region to give rise to parasitic magnetic fields which are of sufficient strength to destroy the usefulness, for torque sensing purposes, of the net magnetic field seen by the magnetic field sensor means.