35 results about "Detent force" patented technology

The present invention provides a control knob on a device that allows a user to control functions of the device. In one embodiment, the knob is rotatable in a rotary degree of freedom and moveable in at least one transverse direction approximately perpendicular to the axis. An actuator is coupled to the knob to output a force in the rotary degree of freedom about the axis, thus providing force feedback. In a different embodiment, the knob is provided with force feedback in a rotary degree of freedom about an axis and is also moveable in a linear degree of freedom approximately parallel to the axis, allowing the knob to be pushed and / or pulled by the user. The device controlled by the knob can be a variety of types of devices, such as an audio device, video device, etc. The device can also include a display providing an image updated in response to manipulation of the knob. Detent forces can be provided for the knob by overlapping and adjusting ranges of closely-spaced detents in the rotary degree of freedom of the knob.

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 universal, quick-mount gunsight mount that does not require any bolts. The mount fits any pistol that has Picatinny Rail or that has any longitudinal groove on the lower muzzle. The mount includes a single piece that slips around the muzzle with two jaws that mate at the top when a sight is clamped on. A protrusion on each side of the mount mates into the slot formed by the Picatinny Rail on the gun, while a detent forces a member into a slot on the bottom of the muzzle. The mount becomes locked to the muzzle and will not move when the gun is fired. The bottom of the mount includes an optional rail that can be used for a laser or light. The mechanical sights supplied with the gun are not blocked and can be used when desired.

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, and a 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 of the motor.

A key operated switch is provided for disabling an automobile air bag passive restraint system. The two or four position switch includes a housing, a rotor, a plurality of rotationally actuated electrical switch elements, a key ejecting mechanism, and a positive positioning detent. The switch assembly is arranged such that a transverse surface of the rotor defining a key slot is accessible through the housing. The key slot allows an operating key to be manually inserted into the rotor. In or order to insert the key, however, the therein, a certain minimum amount of force must be applied to the key sufficient to overcome the key ejecting mechanism. In the absence of such minimum insertion force, the key ejecting mechanism will act expel the key from the rotor. Once inserted into the rotor, the key may be manually rotated which causes corresponding rotation of the rotor. The rotation of the rotor in turn, actuates select electrical switch elements attached to the rotor, according to the angular position of the rotor. The electrical switch elements define a plurality of distinct switch states, each corresponding to a particular angular position of the rotor. Finally, the positive positioning detent forces the rotor to an angular position corresponding one of the distinct switch states defined by the electrical switch elements during those periods when no external torque is being applied to the rotor.

The present invention relates to a kind of curtain body positioning control structure for the window curtain, there is a shaft extruding from the side fixing base of such window curtain coupling with the bead-chain driving mechanism, locking device and fixing base respectively, wherein the said locking device consisting of top push block and locking block, thereat the combination of locking device with locking block is maintaining an elastic condition, due to such locking block is pushed against a spring, in addition, said fixing base is connected to the said locking device with rolling beads particularly, and in this way while such window curtain is being opened or closed by means of bead-chain driving mechanism, a gap between the said locking device and said shaft will be formed with the spring action thereto and hence reducing lots of detent force accordingly, therefore it has an advantage of easy operation; when the curtain is stopping operation, the locking device would be swiveled reversely as well as drawn downwardly by the gravity force of such window curtain, and hence resulting in a various separation distance of the rolling beads which is caused by the displacement of said rolling beads, and under this circumstance a cone hole inside the said locking device will be pushed forwardly to tightly slip onto the said shaft and hence preventing such window curtain from falling downwardly with a locking effect thereof.

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 positioning force compensating type linear permanent magnet synchronous motor which belongs to the technical field of motors and solves the problems that the existing method for reducing the fluctuation of the push force of the linear motor only can restrain the fluctuation of the motor to a certain extent and simultaneously reduces the effective push force of the motor. An air gap is arranged between a primary and a secondary of the motor, the primary comprises an armature iron core and an armature winding and is in a structure of surface mounted armature winding or a cogging structure, the positioning force generated by the interaction of compensating parts and a secondary permanent magnet and the positioning force generated by interaction of the primary iron core and the secondary permanent magnet can be mutually counteracted through the addition of the compensating parts at the yoke parts of two ends of the armature iron core of the primary and using permanent magnets to perform magnetism isolation, so that the acting forces at the front end part and the rear end part of the motor are mutually counteracted. The detent force compensating type linear permanent magnet synchronous motor is suitable for linear permanent magnet synchronous motors.

A pull-out guide (1, 1', 1", 1"'), in particular for domestic appliances or furniture, comprises at least three rails (2, 3, 4) that are mounted so as to be movable relative to each other, one rail (2) being securable to a body and another rail (4) being connectible to a pull-out element, and a detent mechanism (10) for locking a first rail (4) in a predetermined position relative to a second rail (3), a locking mechanism (20, 40, 50, 70, 70') being provided for locking the second rail (3) relative to a third rail (2) in the predetermined position against movement. The pull-out guide according to the invention can thus be moved according to a defined sequence control and with exact detent forces.

A linear brushless DC motor is disclosed which provides reduced detent force by way of a stack that features end teeth that are formed to be wedge shaped, and which has a length in the direction of motion which is approximately equal to (Np+½) × pole pitch, where Np equals the number of poles covered by the armature of the brushless DC motor, and the pole pitch equals a distance between centers of two adjacent magnets of opposite polarity in a field assembly of the linear brushless DC motor.

The invention discloses a low thrust pulsation permanent magnet linear motor, comprising a long-strip secondary pole and a primary pole which is on the secondary pole and can move along the length direction of the secondary pole. Gaps are arranged between the lower surface of the primary pole and the upper surface of the secondary pole on a support frame. The secondary pole is formed by arranging a plurality of iron chips in a front-rear vertical overlying manner in sequence. The lower part of each iron chip is provided with straight teeth in a fractional-slot structure. Adjacent straight teeth form a straight channel. Coils are arranged on the straight channels which are in odd number or even number and are arranged from left to right. The secondary pole comprises a long-strip magnet yoke, bar permanent magnets which are arranged in a front-rear row manner at interval on the upper surface of the magnet yoke. In the same row of permanent magnets, adjacent permanent magnets are arranged at interval. Polarity of the same direction ends of adjacent permanent magnets in the same row of permanent magnets is different, and polarity of close ends of opposite permanent magnets in the two rows of permanent magnets is the same. The low thrust pulsation permanent magnet linear motor is characterized in that linear motor thrust pulsation is effectively restrained through restraining end detent forces and cogging forces.

The invention discloses a detent force umbrella for reentry deceleration of a reentry capsule, comprising plasma collecting electrodes arranged in the front and back of the reentry capsule, and multiturn coils arranged on wall of the reentry capsule, wherein the plasma collecting electrodes are electrically connected with two ends of the multiturn coils; the multiturn coils are uniformly arranged around the wall of the reentry capsule; two collecting electrodes are electrically charged in an unequal manner; the voltage difference caused by the unequal charge enables the multiturn coils to produce current and produce magnetic dipole magnetic field around the reentry capsule after being energized; the ions having an inclined angle between the incidence direction and the dipole magnetic field change movement direction; and some ions are reflected by the magnetic field so as to provide extra resistance for the reentry capsule. The detent force umbrella disclosed by the invention can make full use of plasmas around the reentry capsule during high-speed reentry of the reentry capsule to decelerate, further improve deceleration efficiency of the reentry section of the reentry capsule, reduce control difficulty and risk of the landing section of the reentry capsule, and provide a new technical support for safe and accurate landing of the reentry capsule of the Shenzhou spacecraft.

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).

A shift rail for a vehicle transmission includes multiple detent mechanisms for shifting that operate independently from each other. The shift rail includes a neutral detent mechanism that allows shifting from a neutral position into a gear engaged position at a first detent force, and an in-gear detent mechanism that allows shifting out of a gear engaged position at a second detent force that is greater than the first detent force. By setting the second detent force higher than the first detent force, un-requested shifts out of the gear engaged position, i.e. “jumpout,” can be controlled. Additionally, the neutral and in-gear detent mechanisms include separate springs where spring forces can be varied to adjust shift feel as needed.

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 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 relates to a control method for a multi-stator arc-shaped motor of a large telescope. The control method mainly comprises the following steps that firstly, detent force of the arc-shaped motor is measured, and the magnitudes of the detent force at different positions are obtained; secondly, Fourier nonlinear regression analysis is conducted on obtained position-following detent force change information, and a position-following detent force magnitude change expression of the motor is obtained; thirdly, CLARKE conversion and PARK conversion are conducted on collected three-phase current to obtain direct-axis current id and quadrature-axis current iq; fourthly, a detent force expression obtained through fitting is divided by the moment coefficient of the motor to obtain a position-following compensation current expression; fifthly, in a quadrature-axis current ring, theoretical reference current I*qv is subtracted by compensation current Iqr to obtain actual quadrature-axis reference current I*q. According to the a control method for the multi-stator arc-shaped motor of the large telescope, torque fluctuation, caused by the end effect, of the arc-shaped motor can be eliminated to a large extent, and the requirement for low-speed high-precision rotation of the motor is met.

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 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.

The invention relates to a positioning force compensating type linear permanent magnet synchronous motor which belongs to the technical field of motors and solves the problems that the existing method for reducing the fluctuation of the push force of the linear motor only can restrain the fluctuation of the motor to a certain extent and simultaneously reduces the effective push force of the motor. An air gap is arranged between a primary and a secondary of the motor, the primary comprises an armature iron core and an armature winding and is in a structure of surface mounted armature winding or a cogging structure, the positioning force generated by the interaction of compensating parts and a secondary permanent magnet and the positioning force generated by interaction of the primary iron core and the secondary permanent magnet can be mutually counteracted through the addition of the compensating parts at the yoke parts of two ends of the armature iron core of the primary and using permanent magnets to perform magnetism isolation, so that the acting forces at the front end part and the rear end part of the motor are mutually counteracted. The detent force compensating type linear permanent magnet synchronous motor is suitable for linear permanent magnet synchronous motors.

The invention discloses a novel electric power-assisted lifting mechanism. The novel electric power-assisted lifting mechanism avoids labor waste caused by a manual hydraulic lifting mechanism, realizes a rapid lifting function and solves the problem that a screw rod cannot be actively stopped after being stressed. The novel electric power-assisted lifting mechanism structurally comprises an upperfastening bolt, a moving block, a nut, a screw rod, a left shell, a base, a lower fastening bolt, a gear box, a shell fastening bolt, a motor fastening bolt, a motor, a right shell, a sliding bearing, a damping block, a spring stopping mechanism, a gear set and the like. According to the electric power-assisted lifting mechanism, lifting power is provided by the motor. According to the electric power-assisted lifting mechanism, the screw rod and the nut can be actively stopped, and stopping power is provided by the spring stopping mechanism. According to the electric power-assisted lifting mechanism, the lifting power is transmitted by the gear set.

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.

The invention provides a motor positioning and stopping mechanism which comprises a brake assembly and an inertia part, the brake assembly comprises a fixed part and a movable part connected with thepower shaft, the fixed part and the movable part are provided with stop structures matched with each other, and the inertia part and the movable part are driven by the power shaft to rotate. The inertia part can rotate relative to the power shaft due to the inertia effect of the inertia part when the rotating speed of the power shaft changes. When the motor is powered off, the inertia part rotatesrelative to the power shaft due to the inertia effect of the inertia part, then the movable part is pushed or pulled, the stop structure of the movable part is made to be close to the stop structureof the fixed part, and the power shaft is prevented from rotating through the stop structures abutting against each other. The motor positioning and stopping mechanism can position and stop a power shaft for transmitting motor torque at a set position, adopts a pure mechanical structure as a whole, is free of any electrical element, simple and compact in structure, low in cost and high in universality, and is suitable for electric appliances which are small in internal space, high in rotating speed and inconvenient to control a travel switch and a servo motor.

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 shared intelligent parking space lock power transmission device with a buffer function. The device is mainly and technically characterized in that a mounting bottom plate isused as a mounting and positioning reference of the whole shared intelligent parking space lock power transmission device, a servo electric cylinder and a driving motor are used as a driving unit of the parking space lock power transmission device, the servo electric cylinder is connected with a sliding rail, the pre-pressure on a sliding block is adjusted by adjusting the compression amount of aspring through an adjusting bolt, then the meshing pressure of a rack and a gear is adjusted, the rack is connected with the sliding rail through a standard part, the sliding rail slides in the sliding block, forward and backward movement of the rack and forward and reverse rotation of the gear are achieved through stretching and retracting of the servo electric cylinder, and forward and reverse rotation of the transmission shaft is further realized to realize rising and falling of a plate turnover device. The power transmission device has the advantages that a prime motor can be protected, energy can be saved, meanwhile, the parking space lock power transmission device operates stably, self-protection is achieved, and the power transmission device is prevented from being damaged.

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.