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.

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.

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 (N_p+½) × pole pitch, where N_p 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 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 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 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 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.

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.