32results about How to "Raise the minimum" patented technology

The invention provides a motor drive control device and a motor drive control system which, even when two Hall elements are used, can easily control the driving of a 3-phase brushless motor without separately requiring a control unit having a complicated algorithm. A motor drive control device (1) is for controlling the driving of a brushless motor (51) that includes a stator (52) having 3-phase drive coils and a rotor (53) having plural magnetic poles, and the motor drive control device (1) includes Hall elements (2u, 2v), a drive signal determining unit (7) and an output circuit (8). The Hall elements (2u, 2v) are disposed in positions apart from each other by an electric angle of 120 degrees and output position detection signals (Hu, Hv) representing the position of the rotor (53) with respect to the stator (52). The drive signal determining unit (7) determines drive signals (SU, SV, SW) for driving the 3-phase drive coils on the basis of the position detection signals (Hu, Hv). The output circuit (8) generates and outputs, to the 3-phase drive coils, the drive signals (SU, SV, SW) that have been determined by the drive signal determining unit (7).

The invention discloses a bipolar magnetic material and a manufacturing method thereof. The bipolar magnetic material is prepared from the following raw materials based on mass percentages: 5-88% of permanent magnet material, 5-88% of soft magnetic material, 6-16% of binder and 1-10% of auxiliaries. Meanwhile, the invention discloses the manufacturing method of the bipolar magnetic material. A bipolar magnet is manufactured by a dual-phase mixing mode without microcosmic interaction coupling, an unexpected magnetic function expansion effect is achieved, and the bipolar magnet is expanded on the aspects of permanent magnet and soft magnet from a magnetized attraction object; bipolar magnetism is expanded on the aspect of the permanent magnet from a magnetic attraction object, so that the minimum value of attractive is increased, a phenomenon of infirm adsorption caused by too small maximum value in permanent magnet self attraction can be overcome, so that attraction is more uniform andobject moving and rotating can be smoother; and the bipolar magnet single-layer structure can realize a soft magnet and permanent magnet matching effect, so that a new field is brought to magnetic products by virtue of the bipolar magnet.

Methods of radiotherapy planning and delivery are disclosed in which a radiation beam is directed towards a time-averaged mean position of the target during radiation-on. In addition, the radiation beam is gated to deliver radiation to the target only when the target is within a treatment volume centered on the mean position. Treatment plans according to embodiments of the present invention result in low doses to the surrounding healthy tissue, but high duty cycles and quicker treatment times.

The invention discloses a multi-UAV (Unmanned Aerial Vehicle) cooperation path planning method based on an ant colony algorithm. The method comprises the following steps of (1) analyzing a UAV flight environment, and building environment modeling based on a Voronoi diagram; (2) calculating consideration of an edge in the environment modeling based on the Voronoi diagram; (3) utilizing the ant colony algorithm to plan an initial path for a UAV; (4) smoothing the initial path of each UAV to judge whether cooperation is achieved or not, and carrying out corresponding operation according to the results. According to the multi-UAV cooperation path planning method based on the ant colony algorithm provided by the invention, multiple different kinds of unmanned aerial vehicles are mutually cooperated, intelligently and autonomously adapt to complicated and changeable war environment factors, and dynamically adjust self-strategies so as to cooperatively accomplish the combat mission.

The thick steel plate of the present invention satisfies the prescribed chemical composition and contains constituent elements other than oxygen, by mass %, which satisfy 2%<Ti<40%, 5%<Al<30%, 5%<Ca<40%, 5%<REM<50%, 2%<Zr<30%, 1.0≤REM / Zr oxides, among the oxides, there are 300 pieces / mm in which the equivalent circle diameter is less than 2μm 2 Above, there are 100 pieces / mm if the equivalent circle diameter is 2 μm or more 2 Below, there are 7 Ti nitrides with an equivalent circle diameter of 1 μm or more / mm 2 Below, the equivalent circle diameter of 20nm or more exists 1.0×10 6 piece / mm 2 above, and satisfy the relation |da‑df| / da≤0.35.

A fibrous slurry refiner includes a casing, a rotor secured to a rotor shaft, and first and second pluralities of grinding surfaces. The rotor is disposed within the casing and is rotatable via the rotor shaft. The first plurality of grinding surfaces is secured to the rotor, and the second plurality of grinding surfaces is disposed facing the first plurality of grinding surfaces and fixed in the casing. An inlet plate for each of the plurality of grinding surfaces directs the fibrous slurry toward a set of facing first and second grinding surfaces and imparts a rotary flow to the fibrous slurry.

The present invention provides a power factor correction circuit, including a THD correction circuit, the THD correction circuit includes a compensation voltage source generating circuit and a compensation current limiting circuit, the first input terminal of the THD correction circuit is used to access the first input signal, and the THD correction circuit The second input end of the THD correction circuit is used to connect to the output end of the peak current detection unit of the power factor correction circuit, and the output end of the THD correction circuit is used to connect to the logic circuit of the power factor correction circuit. The compensation voltage source generating circuit is used to generate a negative compensation voltage source to provide to the compensation current limiting circuit, and the compensation current limiting circuit is used to limit the magnitude of the compensation current. The invention increases the minimum value of the inductance current of the power factor correction circuit by compensating the current, reduces the distortion effect of the negative current on the input current in the power factor correction circuit, and can obviously reduce the THD value of the power factor correction circuit.

The invention discloses an active shape control structure for a cable network with a positive Gaussian curvature. During the active replacement work, a total strain epsilon a of a surface cable is equal to the sum of an initial strain epsilon 0 in an initial reference state and an active replacement strain epsilon d during the work, namely, epsilon a=epsilon 0+epsilon d. Because the active replacement work can be normally carried out in the shape control structure of the cable network within a certain allowable temperature difference range, the active replacement strain epsilon d comprises a stress-strain increment delta epsilon e and a temperature strain epsilon T, namely, epsilon d=delta epsilon e+epsilon T. As a result, during the active replacement work, a total stress-strain of the surface cable epsilon e=epsilon 0+delta epsilon e=epsilon 0+epsilon d-epsilon T. During the replacement between the reference condition and some operating condition, the active replacement strain of the surface cable epsilon d is a fixed value unrelated to the load, the specification and the elasticity modulus of the surface cable and the like. According to the invention, an optimization design method based on the initial reference condition is provided, and can rapidly optimize the initial pretension of an inhaul cable in the initial reference state, determine the specification of the inhaul cable and meet the performance requirement in the operating condition of the active replacement.