114results about How to "Reduce starting torque" patented technology

The invention belongs to the permanent magnet synchronous generator technology field, and particularly relates to a method for weakening cogging torque of a permanent magnet synchronous generator. The method for weakening the cogging torque of the permanent magnet synchronous generator includes: firstly, optimizing the shape of a permanent magnet motor tooth so as to reduce the cogging torque; then, optimizing a pole arc coefficient; next, using a magnet pole shifting method to reduce a harmonic component of the cogging torque so as to achieve the purpose of reducing the cogging torque; finally, combining the above three steps so as to minimize the cogging torque, building a finite element model of the permanent magnet synchronous generator, and performing analysis and finite element verification on a provided cogging torque suppression method. The method for weakening the cogging torque of the permanent magnet synchronous generator has the advantages of reducing the cogging torque of the permanent magnet synchronous generator on the premise of slightly influencing other properties of the permanent magnet synchronous generator by changing the shape of the tooth and using an optimal pole arc coefficient method and a magnetic pole shifting method in combination, and then reducing starting resistance torque of a direct drive permanent magnet synchronous wind generator, and improves usage rate of wind energy.

The invention relates to an electromotor energy storage braking system and a control method, and belongs to an energy storage braking system and a control method used for storing and recycling energy generated in the process of electromotor braking. The electromotor energy storage braking system and the control method mainly solve the technical problems that an existing energy storage device is small in stored energy, large in interference to a power grid, inconvenient to use and the like. The electromotor energy storage braking system comprises a main electromotor, a rectifier, a main inverter, a direct current bus, a filter capacitor, a control computer, a first pulse width signal generator and a first driving module, and further comprises a motor rotary speed controller, an electromotor or a generator, a hydraulic pump or a motor, a two-position three-way control valve, a hydraulic energy accumulator, a safety valve, a pressure sensor, a rotary speed sensor, a hydraulic oil tank, a voltage sensor, a second pulse width signal generator and a second driving module. The electromotor energy storage braking system and the control method have the advantages of achieving active control to the process of electromotor braking, saving energy, reducing consumption, achieving energy saving and emission reduction and the like.

The invention provides a magnetic suspension wind power generator, comprising impeller, shaft, motor and bearings, where the impeller is arranged at one end of the shaft, the motor is arranged at the other end of the shaft, and one or two sides of the motor are equipped with bearings, and it is characterized in that: one or two sides of the bearing are equipped with magnetic suspension devices, which comprise one or one group of magnetic or magnetic-conducting rotators fixed on the shaft and magnetic stator device arranged outside the rotators, where the magnetic stator device comprises stator magnet which makes a height difference from the rotator and keeps an axial gap from the rotor. And the invention has features of simple, reasonable and compact structure, low cost, maintenance-free, reducing the starting wind speed of the wind power generator and able to effectively raise the output power of the power generator.

The invention discloses a hydraulic filling type central air-conditioning unit and belongs to the technical field of central air-conditioning. The hydraulic filling type central air-conditioning unit comprises a compressor, a condenser, an expansion valve, an evaporator and a control unit for controlling a machine unit to run and further comprises a bypass pipe enabling a high-pressure refrigerant in the condenser to be led into the evaporator. The bypass pipe is provided with a solenoid valve controlling on-off of the bypass pipe, the evaporator is provided with a temperature sensor for detecting outflow water temperature, and the temperature sensor and the solenoid valve are electrically connected with the control unit. When the temperature of outflow water of the evaporator is larger than a set value, the compressor and the expansion valve are turned off, the high-pressure refrigerant is led into the evaporator by opening the bypass pipe, evaporating temperature of the refrigerant is improved, the speed of lowering the water temperature is slowed down, water in the evaporator is kept flowing continuously, the compressor and the expansion valve are restarted until the water in the evaporator reaches a certain temperature, and accordingly freezing of the evaporator is avoided.

The invention discloses a disk-type magnetic suspension outer rotor type vertical shaft wind-driven generator unit which combines characteristics of Japanese coreless disk-type generators, a plurality of Chinese vertical shaft disk-type inner rotor generators and repulsion-type magnetic suspension vertical shaft disk-type generators and integrated and innovated on the basis of the characteristics. The disk-type magnetic suspension outer rotor type vertical shaft wind-driven generator unit is innovated in that the disk-type magnetic suspension outer rotor type vertical shaft wind-driven generator unit is a suction-type magnetic suspension vertical shaft wind-driven generator unit which is material-saving and low in cost compared with the repulsion type. No extra power supplies and controllers are needed to achieve self-adaptive balance, and accordingly the disk-type magnetic suspension outer rotor type vertical shaft wind-driven generator unit is high in cost performance and promising in market prospect.

The invention provides a permanent magnet wind motor with a combinatorial stator structure which belongs to permanent magnet wind motor field, adopting the technical proposal that: I-shaped punching sheets are laminated to form magnetic poles, a punching sheet bulge and a punching sheet groove are arranged at both sides of a yoke part of the punching sheet, the punching sheet bulge and the punching sheet groove are laminated respectively to form a magnetic pole bulge and a magnetic pole groove when the punching sheets are laminated as magnetic poles, coils are reeled around the magnetic poles to form stator windings, two adjacent magnetic poles are jointed and fixedly welded through the magnetic bulges and the magnetic grooves, the magnetic poles joint a hollow cylinder-shaped stator around the circumference, the pole groove ratio of the stator and the rotor is 24 : 22 or 24n : 22n, n is a natural number, the rotor is embedded in the central part of the stator, an axis is inserted into a wheel hub of the rotor, the axis is in connection with a bearing cone, a bearing cup is in connection with an end cover, the bearing drives the axis to roll and accordingly the axis drives the rotor to roll.

The invention discloses a control method for reducing engine starting torsion. First, a flameout signal is received, and the engine rotating speed and the crank shaft angle are detected, and then whether the engine rotating speed is lower than a rotating speed threshold is judged. If the engine rotating speed is lower than the rotating speed threshold, whether the crank shaft angle is equal to angle threshold value is further judged. If the crank shaft angle is equal to the angle threshold value, an integrated type starting generator is controlled to execute an inversion mode so as to apply resistance force on an engine until the engine rotating speed is lower than or equal to critical value, and the engine is made to stop. Thus, the engine can stop in the non-compressed stroke, and when the engine is started again, torsion needed by starting the engine can be reduced.

The invention discloses a bidirectional gear motor, which comprises a front cover, a shell, a driving gear, a driving gear shaft, a driven gear, a driven gear shaft and a side plate, wherein the shell comprises a groove-type cavity which is formed with an opening on left side; the driving gear, the driving gear shaft, the driven gear, the driven gear shaft and the side plate are arranged in the shell; the front cover is fixedly arranged on the left end face of the shell, and is used for sealing the opening on the left side of the groove-type cavity; the left end of the driving gear shaft runs through the front cover and extends out of the left end of the front cover; a stepped inner cavity is formed on the front cover, and the driving gear shaft runs through from the stepped inner cavity; a bearing cavity is formed on a left end cavity of the stepped inner cavity, and a sealing cavity is formed on a right end cavity of the stepped inner cavity; a bearing is arranged in the bearing cavity; an oil seal is arranged in the sealing cavity; and both the bearing and the oil seal are arranged on the driving gear shaft in a sleeved mode. The bidirectional gear motor disclosed by the invention has the advantages of compact structure, high working pressure, low noise, good high-temperature starting performance, long service life, wide application scope and the like.

The invention relates to a lifting device which is suitable for being used for lifting of a traveling crane, a gantry crane, a hoist and the like. The lifting device comprises a winding drum which is driven by a motor, a fixed pulley assembly close to the winding drum on the upper portion of the lifting device and a movable pulley assembly on the lower portion of the lifting device. The fixed pulley assembly is composed of two fixed pulley groups, and the axial directions of the fixed pulley groups are perpendicular to the axial direction of the winding drum. The movable pulley assembly is composed of two movable pulley groups, and the axial directions of the two movable pulley groups are in a V shape. The lifting device is further provided with a lifting rope. After the lifting rope crosses the two fixed pulleys on the two fixed pulley groups, two ends of the lifting rope are respectively downward wound sequentially between the movable pulley groups and the fixed pulley groups, and then, the lifting rope is wound evenly on the winding drum upward on the movable pulley groups and eventually fixedly arranged at the left end and the right end of the winding drum. The lifting device is small in appearance and size, simple in structure and light in weight.

The invention discloses a voltage-reducing and electricity-saving controller of a motor, comprising a power supply circuit, a microprocessor circuit and a power factor angle acquisition circuit, wherein the power supply circuit is connected with the microprocessor circuit; the controller also comprises a current acquisition circuit, a synchronous information acquisition circuit, a silicon-controlled drive circuit, a silicon-controlled circuit and a control signal input circuit which are respectively connected with the microprocessor circuit, wherein the silicon-controlled circuit comprises a first silicon-controlled group, a second silicon-controlled group and a third silicon-controlled group; each silicon-controlled group comprises two pieces of one-way controlled silicon which are reversely connected in parallel; one end of each group of three silicon-controlled groups is the input end of the controller and the other end is the output end of the controller; and the silicon-controlled drive circuit comprises a first drive circuit, a second drive circuit and a third drive circuit which are connected with the trigger ends of the first, the second and the third silicon-controlled groups in sequence. The invention has the advantages of favorable real-time property, high accuracy and commonality.

The invention relates to a pressure-carrying sealing valve seat which comprises a valve seat body arranged in a valve body and a ball body. The valve seat body is provided with a hole. An opening of the hole and the ball body are in sealing connection through a sealing gasket. The valve seat body is axially arranged in a valve cavity of the valve body in a sliding manner. An annular boss is arranged on the periphery of the valve seat body. A first cavity body and a second cavity body are formed in the two sides of the annular boss. A first guiding hole communicating with the first cavity body and a second guiding hole communicating with the second cavity body are formed in the valve body. A piston structure is adopted in the valve seat body and supplies pressure to the two ends of the valve seat body, the valve seat body can slide relative to the ball body, and the sealing specific pressure needed during zero leakage can be achieved during closing; and leakage does not exist on a valve, and the starting torque needed during opening of the valve can be lowered during valve opening.

The invention discloses a laser ranging device, comprising a machine body and an inner optical system assembly, wherein the inner optical system assembly comprises an inner optical system assembly base, a micro motor, a cylindrical gear, a sector gear, a movable reflector and a torsion spring for locking the reflector; the movable reflector is positioned in the cavity of the inner optical system assembly base and is provided with a reflector rotating shaft at the root; the end of the reflector rotating shaft is provided with the sector gear; the sector gear is meshed with the cylindrical gear with clearance; the cylindrical gear is installed on the micro motor shaft; the micro motor is installed in a motor installation groove of the inner optical system assembly base; the cross section of the motor installation groove is slightly bigger than the 180-degree semicircle; the front end of the reflector rotating shaft is provided with a reflector locking convex body; the front end face of the inner optical system assembly base is provided with a torsion spring installation column and a torsion spring tension pin which are parallel with the reflector rotating shaft; the torsion spring is sleeved on the torsion spring installation column; and two spring plates of the torsion spring are respectively pressed on the torsion spring tension pin and the reflector locking convex body. The laser ranging device has simple structure and accurate test results and is reliable in operation.

The invention relates to a method for improving low-speed performance of a multi-cylinder engine. The method comprises a process of keeping an engine valve open in constant by using a solid-chained mechanism. In the first predetermined engine speed, a working piston of the solid-chained mechanism is placed on the operating position, forming the mechanical link with the engine valve, keeping the opened engine valve from closing; and in the first predetermined engine speed or the lower engine speed including zero, keeping the engine valve open in constant. Before the engine start and during the start, the working piston of the solid-chained mechanism keeps the engine valve open in constant sequentially, until the engine speed is increased from zero to the second predetermined engine speed, the working piston is switched from the operating position to the non-operating position, and cancelling the effect on the engine valve. The method uses the novel method and mechanism, and is capable of keeping an inlet valve or an exhaust valve of the engine open in constant, improving the parking, starting and idling performance of the engine, and reducing the fuel consumption and discharge of the engine.

The invention discloses a small torque electric ball valve, which comprises a valve body (1), a ball valve core (2), a sealing ring (3), an O-ring (4), a valve stem (5) and an electric driver (6). In the present invention, an elastic and silicon rubber O-ring is arranged between the sealing ring and the valve body. When the electric ball valve is started, a shearing and sliding tendency occurs between the ball valve core and the sealing ring, and the elasticity of the O-ring is used to make the sealing ring produce Elastic retreat, reducing and overcoming the static adhesion between the ball valve core and the sealing ring, using a small torque to make the static friction between the ball valve core and the sealing ring transition to dynamic friction, thereby reducing the technical scheme of the starting torque, making the electric ball valve , to achieve the purpose of reducing the starting torque and turning torque.

The invention discloses a radial magnetic field coreless permanent-magnet wind driven generator, comprising a rotor inside cylinder, a rotor outside cylinder and a stator cylinder which are arranged coaxially; wherein, the rotor inside cylinder and the rotor outside cylinder are connected into a whole and are connected with a main shaft by a bearing, and the opening directions of the rotor inside cylinder and the rotor outside cylinder are consistent, the opening direction of the stator cylinder is opposite to that of a rotor cylinder, and the wall of the stator cylinder is arranged between the rotor inside cylinder and the rotor outside cylinder, inner magnetic steel is uniformly distributed at the periphery on the wall of the rotor inside cylinder, outer magnetic steel is uniformly distributed at the periphery on the wall of the rotor outer cylinder, the polarity of the uniformly distributed inner magnetic steel and the outer magnetic steel is changed in an alternating way, and the polarity of the opposite inner magnetic steel and the outer magnetic steel is opposite, and wire coils are uniformly distributed on the wall of the stator cylinder. In the invention, starting torque is effectively reduced, so as to solve the problem that the dynamo is difficult to start under the condition of breeze.

The invention relates to a permanent-magnet synchronous motor or generator comprising at least one rotor (2) and at least one stator (3, 8). The motor comprises two rotors (2), four stators (3, 8) anda cooling system (7, 7a) comprising three cooling circuits (7, 7a), i.e. two outer circuits (7) which are each accommodated in a longitudinal outer wall of a casing (8), adjacent to an outermost stator (3, 8), for cooling said outermost stator (3, 8), and an intermediate circuit (7a) located between the two innermost stators (3, 8) in the motor for simultaneously cooling said two stators (3, 8),the central shaft (5) being common to the two rotors (2) which are connected to the central shaft (5) by mechanical means.

The invention relates to a flexible starting device of a stirring type wind heater. The device comprises the heater, and a fan, a stirring blade is arranged in a stirring bucket of the heater, the stirring blade is connected to the fan outside the stirring bucket through a transmission shaft and a coupler, a hydrodynamic coupling is connected between the transmission shaft and the coupler, throughthe hydrodynamic coupling, the starting property of the heater is improved, in order to achieve flexible starting of the wind heater, the hydrodynamic coupling is adopted, the hydrodynamic coupling is arranged between the heater and the coupler, through the hydrodynamic coupling, the starting torque of the heating system is obviously reduced, the heating system is started under the condition thatthe wind is weak, and can be normally used, and the starting problem of a wind machine under the low wind speed is solved.

The invention relates to a grinding disk of a ground grinding machine driven by a motor. The grinding disk of the ground grinding machine driven by the motor comprises a base disk. The work face of the base disk is an independent flat disk. The width of the work face of the base disk is larger than 500 mm. A motor is a vertical axis direct drive motor. The direct drive motor is directly or indirectly connected with the base disk. A fixing device is arranged on the lower surface of the base disk. The fixing device is fixedly provided with grinding blocks. Compared with the prior art, the grinding disk of the ground grinding machine driven by the motor has the following advantages that the grinding disk is of an independent type, and by changing the arrangement manner of the grinding blocks,and the size of the grinding work face can be freely set; the large-torque direct drive motor is used for driving, so that the torque is large; the ground surface is ground flatly; the grinding blocks can be disassembled, assembled and replaced, and overhauling is rapid and convenient; a middle disk and the base disk are connected through an elastic damping rubber ring, so that the starting torque is reduced, and a buffering function is achieved; installation grooves can adopt circumferential alternate or radial alternate arrangement, so that the installed grinding blocks compensate for one another, the number of the grinding blocks is reduced, and uniform and comprehensive grinding is guaranteed.