86results about How to "Smooth torque" patented technology

A mode selector mechanism is provided for a rotary power tool for selecting between an impact mode and a drill mode. The power tool includes a housing, a motor oriented in the housing, an input shaft and an output shaft both rotationally mounted in the housing. An impact mechanism connects the input shaft to the output shaft for imparting a rotary impact to the output shaft when the torque load exceeds a predetermined torque capacity of the impact mechanism. A stopping member is shiftable by a user between a first orientation that permits the impact mechanism to operate in the impact mode and a second orientation that prevents a coupler of the impact mechanism from retracting, thus maintaining the connection of the input shaft and the output shaft in the drill mode.

A turbine generator system, having: a rotatable base; and a plurality of rotor vanes extending from the rotatable base, wherein each of the rotor vanes have helical tapered inner and outer surfaces, and wherein each of the rotor vanes is curved to catch flow perpendicular to the axis of rotation of the rotatable base and to direct the flow into a vortical flow between the inner surfaces of the rotor vanes.

Disclosed are crankshaft, single-plate cam and beam mechanisms that provide significant improvements in performance for 2 & 4-stroke engines, compressors and pumps. These cost effective mechanisms include linkages with the new and improved use of pivoting arms that operate with a variety of cylinder arrangements. One embodiment of the crankshaft mechanism has its crankpin roller positioned within a novel yoke-arm. The cam mechanism uses a pair of centrally positioned parallel links that are connected to roller cam followers and single or diametrically-opposed pistons. A pair of laterally extending follower arms connects to the ends of the links to provide support and alignment for the piston rods. Between the reciprocating links, cam followers and follower arms is a rotating odd-lobe plate cam. A beam mechanism uses opposite-direction extending balancing beams that are connected to links, cam followers and piston rods.

The invention discloses a braking downshifting control method for an automatic six-speed wet type double-clutch transmission. The braking downshifting control method for the automatic six-speed wet type double-clutch transmission comprises the steps that a driving intention is judged rapidly by monitoring the traveling state in real time, and the target accelerated speed is worked out; and then the target gear is updated in real time by checking a gear graph, whether the downshifting type refers to that an odd number of gears need to be reduced or that an even number of gears need to be reduced is determined according to the target gear, so that corresponding single-gear downshifting or multi-gear downshifting is controlled. According to the braking downshifting control method for the automatic six-speed wet type double-clutch transmission, in order to guarantee smooth downshifting of a vehicle, multi-gear downshifting in a repeated-braking downshifting strategy is developed based on the structural characteristics of a wet clutch and is verified in real vehicles.

The invention provides a switched reluctance motor with torque pulsation inhibited by permanent magnetic flux, belongs to the motor field, and aims to solve the problem of unobvious effect of the prior method for inhibiting the torque pulsation of the switched reluctance motor. In the switched reluctance motor, a stator and a rotor both have a salient-pole structure; two permanent magnets are symmetrically embedded along the radial direction inside the external circle surface of a stator core, and are arranged in stator cores corresponding to stator phase windings in the radial direction; the magnetic flux direction generated by the permanent magnets is in accordance with the magnetic flux direction of excitation generated by a stator winding; and the stator winding generates a magnetic field to cover the permanent magnets. When the stator winding is not electrified, the permanent magnets and the stator core form a loop, and do not generate a torque to the motor rotor. After the stator winding is electrified, the torque generated by the permanent magnets is changed into positive from negative; when the torque generated by the permanent magnets is negative, a torque wave crest is inhibited; and when the torque generated by the permanent magnets is positive, a torque wave trough is compensated, so that the torque pulsation of the switched reluctance motor is effectively inhibited.

The invention belongs to the field of mining hydraulic motors, and especially discloses a same-distribution-angle hydraulic cylinder motor. A technical problem to be solved is providing a same-distribution-angle hydraulic cylinder motor with the advantages of simple structure, operation convenience, high safety coefficient, long service life and effective reduction of the coal mine underground accident rate. The motor comprises a case body, three hydraulic cylinders, a crankshaft, a case body front end assembly and a control system, the whole case body is a shell structure, the three hydraulic cylinders are arranged in the case body side by side, the front end of the case body is provided with a case body semicircle seat for installing the crankshaft, the case body front end assembly is fixedly connected with the case body to fix the crankshaft, the piston terminals of the hydraulic cylinders are connected with the crankshaft through piston terminal covers, the hydraulic cylinders move back and forth to drive the crankshaft to rotate, the crankshaft drives the control system to move, and the control system controls the reciprocating motion of the three hydraulic cylinders in order to drive the crankshaft to continuously revolve. The motor adopting the hydraulic cylinders to drive the crankshaft to rotate has the advantages of low rotating speed, large torque, and suitableness for the use requirements of coal mine underground equipment.

The invention provides a brushless direct current motor without core losses, comprising outer Halbach magnets, inner Halbach magnets, a rotor shaft and coreless stators formed by windings and frameworks, wherein the outer Halbach magnets and the inner Halbach magnets are connected on the rotor shaft by magnet isolating sleeves so that the outer Halbach magnets and the inner Halbach magnets rotate synchronously with the rotor shaft; the coreless stators are installed and fixed on casings; the outer Halbach magnets, the coreless stators, the inner Halbach magnets and the air gaps among the magnets and the coreless stators form closed magnetic circuits; and sinusoidal magnetic fields with high density are formed between the outer Halbach magnets and the inner Halbach magnets. The motor provided by the invention removes the stator cores and the rotor cores so that the rotors do not have core losses at any working speed, thus radically solving the problem of core losses, and the motor simultaneously has the advantages of light weight, low power consumption, reliable structure and the like.

The invention discloses a fault tolerant system and method of a single-phase winding short circuit of a three-phase permanent magnet synchronous motor of an open winding. A current regulation function machine generates normal phase initial reference currents, short circuit phase currents compensate the normal phase initial reference currents, final reference currents are formed, and finally the final reference currents and double inverter normal phase currents are compared through a current hysteresis comparator to generate double inverter normal phase switching signals to double inverters. Compensation of the short circuit phase currents for the normal phase currents eliminates the influence of fault phase currents on motor torque, the purpose of tolerance of single-phase winding short circuit faults is achieved, the current use ratio of the motor winding is improved, and stable torque can be output.

The invention provides a shutdown control method and device for a wind power generator set. The method comprises the steps that an interval with a larger decrease rate of the rotating torque in a curve of the corresponding relation between the rotating speed and the rotating torque in the operating process of a preset wind power generator set is determined, an inflection point corresponding to a smaller rotating speed value in the inflection points of two ends of the interval is used as a critical point, and one or more reference points are selected according to the critical point; the rotating speed when a wind power generator is shut down is collected, when the rotating speed is higher than the rotating speed corresponding to the critical point, and a monotonous shutdown control functionwith an upward opening is constructed according to the rotating torque and rotating speed data corresponding to the reference point and the rotating torque and rotating speed data of the actual initial shutdown time of the wind power generator set; and a rotating torque value corresponding to the rotating speed is obtained according to the shutdown control function, and shutdown control is carried out on the wind power generator by utilizing the rotating torque value. According to the method, the rotating torque of the generator can be declined in a more stable manner, so that the vibration impact on the wind power generator set caused by sudden change of the rotating torque in the shutdown process is reduced.

A power generation control device for a generator driven by a four-stroke cycle engine is provided. The power generation control device includes a switching circuit for controlling an output current from the generator; and a power generation period control device configured to operate the switching circuit to output the output current from the generator in only a predetermined power generation period of the four strokes of the engine, wherein the power generation period ranges from an expansion stroke to an intake stroke of the four strokes.

The embodiment of the invention discloses an ultrasonic motor driving control device and control method and belongs to the motor control technical field. With the ultrasonic motor driving control device and control method of the invention adopted, the rotation speed and torque of the operation of an ultrasonic motor can be effectively adjusted and stabilized. The method of the invention includes the following steps that: feedback signals of excitation voltage and excitation current of the ultrasonic motor are received; square wave signals are converted to triangular wave signals through an integral link; modulation is performed according to the triangular wave signals and the feedback signals of the excitation voltage and the excitation current, so that modulated square wave signals can be obtained; and power amplification is performed on the modulated square wave signals, and the square wave signals which have been subjected to power amplification are inputted into the ultrasonic motor. The ultrasonic motor driving control device and control method of the invention are applicable to the driving control of ultrasonic motors.

A wind turbine arranged to operate in confined area is disclosed. The wind turbine is constrained within two axially displaced end plates and diametrically opposed wind barriers. The wind barriers are parallel to the axis and extend between end plates. The wind barriers each having an axially extending inner edge radially spaced from an outer swept surface of the turbine blades by less than 20% of the turbine radius. In another embodiment, there is disclosed a 2-dimensional array of wind turbines, with wind barriers being arranged between parallel axes.

A bearing device for a wheel, in which circumferential play is suppressed, in which a hub ring and an outer joint member of a constant velocity universal joint can be connected to each other with good workability, and in which the hub ring and the outer joint member are adapted to be separable for excellent maintainability. In the bearing device, the hub ring (1), a double-row roller bearing (2), and the constant universal joint (3) are unitized, and the hub ring (1) and a shaft (12) of the outer joint member of the constant universal joint (3), which is fitted in a hole (22) of the hub ring (1), are separably joined to each other by a groove-ridge fit structure (M). Ridges (35) extending in the axial direction are provided either the outer diameter surface of the shaft (12) of the outer joint member or the inner diameter surface (37) of the hole (22) of the hub ring (1). The ridges (35) are press-fitted into the other in the axial direction to form grooves (36) in the other such that the grooves (36) are in intimate contact with the ridges (35). Thus, the groove-ridge fit structure (M) is formed, in which the ridges (35) and the grooves (36) are in close contact with each other in the entire area of the fit-contact portion (38) between the ridges (35) and the grooves (36). The groove-ridge fit structure (M) allows separation between the hub ring and the outer joint member performed by pulling force applied in the axial direction.

The invention provides a magnetic circuit structure of a washer variable frequency DC motor, and relates to the technical field of washers. The magnetic circuit structure of the washer variable frequency DC motor comprises a stator iron core, magnetic shoes are arranged on the outer circumference of the stator iron core, and a magnetic yoke is arranged outside the magnetic shoes. The magnetic circuit structure of the washer variable frequency DC motor is characterized in that an N pole and an S pole are formed in the same magnetic shoe through magnetic steel magnetizing, the magnetic shoes are circumferentially and evenly distributed on the magnetic yoke so that each pair of N pole and S pole can deflect relative to the angle of the circle center, harmonic waves of 2p and the multiple of 2p are weakened, the efficiency of the motor is improved, and meanwhile the processing technology is simplified. Twelve magnetic shoes are evenly distributed on the magnetic yoke to form a motor with 12 pairs of poles, and cogging torque can also be weakened. The entire machine working noise caused by torque fluctuation is reduced, meanwhile, the motor can achieve higher torque density, the mechanical hardness of the motor is improved, and revolution drop caused by incremental loading of the motor is reduced. Meanwhile, the system response speed is increased under the condition of the same loads, the acceleration time can be shortened, and the unit eddy-current loss of the stator iron core of the motor can further be reduced.

In the present invention the positions of the slots or poles of the stator of an electric motor are changed in order to reduce the harmonics caused by the stator winding and any vibration caused by these harmonics. In the present invention a shape function is defined according to the new placement positions for the stator slots and/or stator poles. A conversion function sums for the slot placement positions to be given to equidistant stator slotting placement. In one embodiment of the invention the conversion function is the sum of sinusoidal functions and in its amplitude small in relation to the distance between the slots.

The invention discloses a method for realizing multistep speed regulation of single-phase alternating current motors. The single-phase alternating current motor comprises a low-speed tap and a high-speed tap; the single-phase alternating current motor realizes two different rotating speeds after the input current is led into the low-speed tap and the high-speed tap respectively; the input current of the single-phase alternating current motor is divided into a plurality of continuous input cycles; each input cycle contains n cyclic waves; n cyclic waves in each cycle are divided into two continuous parts and are input into the low-speed tap and the high-speed tap; and the single-phase alternating current motor adjusts the rotating speed through adjusting the wave number proportion of the two parts. The method of the invention divides the input current into a plurality of input cycles containing integral numbers of cyclic waves; each input cycle is divided into two parts to be input to the high-speed tap and the low-speed tap of the motor; the method realizes the adjustment to the rotation speed of the motor through changing proportion of the two parts, can not generate pollution to power grids, has low cost, stable motor operation and smaller noise.