35 results about "Detent force" patented technology

A rifle scope has a body with a number of optical elements. An adjustment knob is rotated we connected to the body and interacts with at least one of the optical elements to provide an image shift in response to rotation of the knob. A detent mechanism interacts with the knob, and has a number of detent positions. Many of the detent positions have a first detent force, and a selected subset the detent positions have a greater second force. The selected subset of detent positions may correspond to selected major distance intervals.

A door checker for an automobile, includes: a case 1 fixed to a door D; a check plate 6 which movably penetrates the case 1 and is turnably connected to a body B; a pair of upper and lower detent members 16 slidably held in the case 1 to hold the door D at a predetermined opening position in cooperation with a pair of upper and lower detent surfaces 10 of the check plate 6 ; and an elastic member 17 which is made of an elastic material for generating a detent force between the detent member 16 and the detent surface 10 . In this door checker, a drain hole 20 is provided in the check plate 6 in a portion projecting into the door D from the case 1 and at least at a position close to the case 1 as to penetrate the upper and lower detent surfaces 10 when the door is fully closed. Thus, even if rainwater and the like go into the door D and drop onto the upper surface of the check plate 6 , it is drained quickly from the check plate 6 and are prevented from flowing into the case 1.

A no-back device for a power drive unit is configured such that, during operation of the power drive unit, the no-back device does not supply magnetic or frictional force against power drive unit rotation. The no-back device is implemented either redundantly or no-redundantly, and includes a latch rotor and an electromagnet. In both embodiments, the latch rotor is coupled to the power drive unit to rotate therewith, and the electromagnet is coupled to receive a flow of current and, upon receipt thereof, generates a magnetic field force that opposes rotation of the latch rotor. In the redundant embodiment, the no-back device further includes one or more permanent magnets, and the magnetic field generated by the electromagnet selectively opposes or aids the magnetic field supplied by the permanent magnet(s).

In a linear motor (1), the detent force is reduced by the height of the iron poles (522) being selected differently in the two outer regions of the coil set, preferably by a gradual reduction of the height of the iron poles (522) towards the ends of the stator (2). In combination with a slight inclination of the magnets, the detent forces are further minimized, with negligible losses of the propulsive force.The exact dimensioning of the iron poles (522) is dependent inter alia on the dimensioning of the coils (51) and other characteristics of the linear motor (1) as a whole, and can be found and optimized by simulations. Here, an optimum is sought between as great a reduction as possible of the detent force amplitude and as high a propulsive force as possible. A linear motor (1) according to the invention has substantially the same manufacturing costs as a conventional linear motor without measures against the detent forces, because no costly active devices are necessary and the production of the stator does not become more complicated. As no additional space is necessary for active or passive devices for detent force reduction, such a linear motor is of more compact construction and therefore has a higher power density.

The invention relates to a plug-in connection for pipe and hose lines with a reinforced material cross-section. Said connection consists of a neck that forms at least one detent collar and a connector that can be engaged with the neck and has at least one detent spring with detent limbs, the latter locking behind at least one of the detent collars of the neck. In order for the connector to absorb intense detent forces, it is characterised by at least a double wall in the vicinity of the detent spring openings.

The invention discloses an inner rotor permanent magnet synchronous magnetic resistance type traction drive device which comprises a brake, a supporting seat and a rotating shaft rotatably mounted on the supporting seat, wherein the brake is mounted on the supporting seat. The inner rotor permanent magnet synchronous magnetic resistance type traction drive device further comprises a rotor and a stator, wherein the rotor is arranged on the rotating shaft in a sleeved mode and is fixedly connected with the rotating shaft, and the stator is arranged outside the rotor in a sleeved mode and is fixed on the supporting seat. A plurality of first grooves are formed in the surface of the outer circumference of the rotor, a plurality of second grooves are formed in the surface of the inner circumference of the stator, and permanent magnets are arranged on the bottoms of at least two second grooves. When the axis of the rotor is not aligned with the axis of the magnetic pole of the stator, detent force can act on the rotor to generate torque to enable the rotor to tend to the position with the smallest magnetic resistance, the torque pulsation of the rotor is reduced thereby, noise is reduced, and comfortableness of taking an elevator is improved. When a field winding is powered on, the paths of electro-excitation magnetic force lines and the paths of permanent magnet magnetic force lines form magnetic paths in parallel, the two magnetic fields and the rotor are overlaid at an air gap position, an air-gap field is improved, total magnetic flux of the air gap is increased, and noise is reduced.

The invention provides a power battery charging and discharging protection method and device. The power battery charging and discharging protection method is an active protection mode. The change rateof a running speed control signal in the running process is actively monitored; and then a corresponding charging and discharging power limit value is determined according to the change rate of the running speed control signal. The charging and discharging power limit value is converted into a torque limit value of a motor in a locomotive. And finally, the torque of the motor is controlled to belower than or equal to the torque limit value. It can be know according to the process that the method monitors the change rate of the running control signal, adjusts the torque limit value of the motor according to the change rate of the running control signal and controls the charging and discharging power limit value of a power battery by controlling the output torque of the motor; and therefore, an over-charge or over-discharge phenomenon of the power battery is prevented, and the service life of the power battery is prolonged.

The invention discloses a method for calibrating an inherent wave power of an iron core type permanent magnet synchronous linear motor. The iron core type permanent magnet synchronous linear motor has two inherent cogging force and detent force, the cogging force is only related to a relative position between a rotor and a stator of a motor, and the detent force is related to the relative position between the rotor and the stator of the motor and a winding current. According to the invention, the method for calibrating the cogging force and the detent force is given through two groups of experiments. In the first group of experiments, a track of the rotor of the motor, which moves from a D1 point to a D2 point along the positive direction of a movement axis, is given, and the uniform motion of the rotor of the motor along the positive direction of the movement axis is completed according to the given track. In the second group of experiments, an external force with constant size along the direction of the movement axis is applied to the rotor of the motor, and the uniform motion of the rotor of the motor along the positive direction of the movement axis is completed according to the track given in the first group of experiments, and acting forces output by a controller in the two groups of experiments are respectively recorded. The method for calibrating the inherent wave power of the iron core type permanent magnet synchronous linear motor is given according to a force balance condition.

A loop-typed pierced earring has a pivotally mounted ear post that spans the gap in the ring and moves in an arc transverse to the plane of the ring from an open position, to permit insertion through the ear lobe, to a locked position with the ear post free end held in a locking detent in the other end of the ring body. Movement of the ear post end into the locking detent forces a slight inward deflection of the resilient end post, after which the end springs into engagement with a locking recess. Attachment of the earring is simple and direct and requires no visual alignment by the wearer.

The invention discloses a moving magnet-type cylindrical linear motor. The moving magnet-type cylindrical linear motor primarily consists of a winding, an iron core, a core shaft, a nonmagnetic guard shaft and the like; and the moving magnet-type cylindrical linear motor secondarily consists of a permanent magnet topology, an end cover, a linear bearing and a shell and is a movable structure, anda kinematic pair is formed by the linear bearing and the primary nonmagnetic guard shaft. The moving magnet-type cylindrical linear motor has the advantages of being capable of obviously improving motor thrust loading, and effectively inhibiting tooth space detent force by the non-uniform permanent magnet topology, primarily adsorbing no machined chips or iron chips and ensuring safe operation ofthe motor.