411results about How to "Large starting torque" patented technology

A projected shape of permanent magnets is contained within a plane of projection formed by adjacent claw-shaped magnetic poles overlapping when the claw-shaped magnetic poles are viewed in a direction of rotation of a rotor, and is generally similar in shape to a shape of the plane of projection.

The invention discloses a hybrid excitation type variable frequency AC starting generating system and a control method thereof. The hybrid excitation type variable frequency AC starting generating system comprises a hybrid excitation type variable frequency AC starting generator, a first current sensor for detecting excitation current, a second, current sensor, a third current sensor, three voltage sensors, a position sensor, a changeover switch, a starting switch and a starting generating controller, wherein the second current sensor and the third current sensor are used for detecting armature current. The control method comprises the steps of performing the vector control method based on inverter voltage compensating during starting, and adjusting the excitation current according to the motor armature current and the real-time rotating speed; performing the sectional PI control method based on the output voltage frequency change during generating the power, and adding a load current compensating ring; controlling the changeover switch to switch according to the motor rotating speed and the output voltage during switching from starting to power generation. The method has important application value in the field of aviation independent power starting generating systems.

The invention discloses a brushless direct current reluctance starter generator. The generator comprises a three-phase armature winding, an exciting winding, a winding series-parallel switching switch, a stator iron core, a rotor iron core, a shaft, a position sensor, a bridge converter and a controller, wherein armature coils, wound intensively, are wound on each pole of the stator iron core; excitation coils are wound by crossing three stator poles; and the armature coils in the same phase are in series or parallel connection to form a group. According to the starter generator, a reluctance structure is used; no winding is generated on the rotor; the generator is simple in structure and reliable to operate; excitation current can be adjusted to keep stability of output voltage during generating; when the generator is started, the generator rotates by means of a reluctance torque; the armature coils are connected in series; a large starting torque is achieved; the generator is applicable to operation at a low speed; the excitation winding is used for generating a magnetic field during generating; the armature coils are connected in parallel; small armature reaction is generated; and the generator is applicable to operation in a high speed. The brushless direct current reluctance starter generator is very applicable to transport tools comprising vehicles.

A permanent magnetism synchronous hub motor for electrically driven vehicle direct drive comprises shafts, a left end cover, rotors, stators, a right end cover, a rotating transformer, bearings are arranged on the shafts, inner rings of the left end cover and the right end cover are connected with the bearings in interference fit, stators are hot sleeved on the support of the shaft, the left end cover, the right end cover and the rotors are jointed together by bolts, the rotors are composed of rare earth magnet steels at interval adhering in the inner wall of the support by the magnet steel glue. The invention can be mounted in the vehicle wheel hub for directly driving the vehicle wheel and save traditional drive devices, thereby simplifying the whole vehicle structure, improving the drive efficiency and using the space effectively; the invention is an outer rotor motor without reduction gear mechanism, has small volume, large power, large starting moment, good control performance and low energy consumption, can reduce the whole vehicle weight and the maintenance cost and improve continued mileage and battery life.

The invention discloses a fault diagnosing and repairing method for a washing machine. The fault diagnosing and repairing method includes the steps of monitoring a washing progress, a loading state and a motor operation state of the washing machine in real time; if fault information is detected, judging a fault type according to the motor operation state; repairing the washing machine according to the fault type and the washing progress and the loading state of the washing machine when the washing machine breaks down; judging whether the fault is a hardware fault according to a repair result; if yes, performing fault alarming; if not, continuously operating the washing progress when the washing machine breaks down after repairing. The fault diagnosing and repairing method for the washing machine has the advantages that judgment fault probability can be lowered, and a repair rate of the washing machine can be lowered.

The invention relates to the technical field of undervoltage releases, in particular to an electromagnetic undervoltage release which is provided with a forced start-up circuit; the forced start-up circuit comprises a filter circuit connected with a power grid, a voltage-reduction capacitor, a bridge rectification circuit, a start-up capacitor, an energy-storage voltage detection circuit for detecting the voltage of the start-up capacitor, a power grid voltage detection circuit for detecting the voltage of the power grid, a control circuit and a system power circuit for supplying power to the control circuit; the output end of the filter circuit is serially connected with the voltage-reduction circuit and then connected with the bridge rectification circuit, the output end of the bridge rectification circuit is connected with the anode of the start-up capacitor and an electromagnetic coil, the cathode of the start-up capacitor is grounded, the other end of the electromagnetic coil is serially connected with a switch circuit controlled by the control circuit, and the other end of the switch circuit is grounded; and the output ends of the energy-storage voltage detection circuit and the power grid voltage detection circuit are connected with the input end of the control circuit. The invention solves the technical problems that the coil has large heating quantity, the starting torque of the undervoltage release is small, the circuits are excessively complex, and the like in the prior electromagnetic undervoltage release.

The invention discloses a novel rotor initial position detecting technique which is used when a three-phase electro-magnetic doubly salient motor is started in six states. Because the research of a sensorless technique of the electro-magnetic doubly salient motor is very little at home and abroad, the invention provides a rotor position prediction method based on two-two conducted and injected low-pressure pulse vectors by aiming at the unique characteristic of the three-phase electro-magnetic doubly salient motor that an armature inductance value is a function of the rotor position. According to the method, only the terminal voltage of a non-conducted phase is detected, and the rotor initial position can be precisely predicted by comparing response amplitudes of the terminal voltage of the non-conducted phase on a conduction stage and a flow-continued stage. According to the method, any additional component is not needed, and an armature current sampling transformer is omitted; the method has the advantages of economy and practicability; and additionally, the positioning accuracy can reach 60 DEG, and the three-phase electro-magnetic doubly salient motor is guaranteed to be started in the six states, so as to increase the starting torque of the motor.

The invention relates to a mechanical type continuously variable transmission device. In the tooth meshing transmission non-stage transmission, two increasing-decreasing gears with gear diameters which are variable as required are used as speed ratio changers, when the gear diameter of one increasing-decreasing gear increases, the gear diameter of the other increasing-decreasing gear decreases the same length correspondingly at the same time, and the two gears are driven by the meshing of a toothed chain. The non-stage transmission overcomes the defects of the friction type continuously variable transmission (CVT) such as small drive moment, chain and wheel slippage, small starting moment, high gear shift power consumption, and really realizes the stepless speed change of tooth meshing transmission. The tooth meshing transmission non-stage transmission has the advantages of big drive torsional moment, small volume, and simple structure, and can be applied to various large and small-sized machines in large and small-sized vehicles or fixed occasions.

The invention discloses a combined brushless direct-current starter generator system and belongs to the field of starter power generation technologies. A brushless direct-current starter generator comprises an electrically-excited doubly-salient motor and a permanent magnet motor, wherein the motors are coaxially connected. An armature winding of the electrically-excited doubly-salient motor is connected with a bridge rectifier circuit to serve as a generation output end of the starter generator system. An armature winding of the permanent magnet motor is connected with a bidirectional bridge power conversion circuit and an asymmetric half-bridge circuit. An exciting winding is connected with a midpoint of the asymmetric half-bridge circuit. During starting, the permanent magnet motor drives an engine to start; after starting, the permanent magnet motor serves as the electrically-excited doubly-salient motor exciter providing the exiting winding with exciting current. The invention further discloses a control method of the combined brushless direct-current starter generator system. Starting torque is stable; power generation control is simple; the problem that starting source voltage and generation output voltage are unbalanced is solved; starting and generating functional decoupling control is achieved; starting and power generation switching is simple and reliable to control.

The invention provides an electromagnetic under-voltage release comprising a filtering rectifying circuit, a sampling circuit, a power supply circuit, a control module, a driver module and an electromagnet. A direct-current resistance of a starting winding is less than a direct-current resistance of a working winding. According to the electromagnetic under-voltage release and the controlling method thereof, a microcomputer is used for controlling the control circuit, and the controlling thinking is clear and the circuit structure is simplified and ingenious. The starting winding-working winding dual-coil electromagnet is arranged at the circuit, and the direct-current resistance of the starting winding is less than the direct-current resistance of the working winding and the working current of the starting winding is high and the starting torque is large, so that the pull-in performance of the electromagnet can be ensured. And the working current of the working winding is low and thus the basic power for pull-in maintaining of the electromagnet is provided, so that the heating value is extremely low.

The invention provides a rotor, which is used for a self-starting three-phase permanent magnet motor. The rotor is a mixed magnetic circuit solid rotor and comprises a rotating shaft and a pole shoe arranged around the rotating shaft, and the rotor also comprises a first permanent magnet and a second permanent magnet, wherein the first permanent magnet is arranged around the rotating shaft and is positioned between the rotating shaft and the pole shoe, and generates radial magnetic circuit; and the second permanent magnet is arranged around the rotating shaft and is positioned in the pole shoe, and generates a tangential magnetic circuit.

The invention discloses a wall climbing robot. The wall climbing robot comprises a vehicle body, four driving units and four crawler belts, wherein two of the driving units are respectively mounted on the left side and the right side of the vehicle body, and the four driving units are connected with the crawler belts separately; each of the crawler belts comprises a plurality of crawler belt plates in annular connection, each of the crawler belt plates comprises a magnetism conductive mounting plate, a magnetism isolating plate and permanent magnets, the magnetism isolating plate is arranged on the magnetism conductive mounting plate, and the two permanent magnets in contrary magnetism are embedded at lateral symmetrical positions of the magnetism isolating plate; the magnetism of one of the two adjacent permanent magnets on the two adjacent crawler belt plates is contrary to the other; the vehicle body comprises a frame, a turning and mounting device and a cleaner main body, wherein one end of the turning and mounting device is connected with the front end of the frame through hinges; the cleaner main body is arranged at the central position of the turning and mounting device; an pneumatic motor is arranged in the vehicle body. The wall climbing robot disclosed by the invention has the advantages of being flexible and smooth, being good in loading property, being wide in cleaning range, and being high in magnetic adsorption efficiency, and is suitable for hulls and large-scale tank bodies.

A self-strong excitation bidirectional high-voltage gain interleaved switch reluctance motor power converter system comprises a main circuit, an excitation power supply and a bidirectional DC-AC-DC, wherein the main circuit, the excitation power supply and the bidirectional DC-AC-DC are mutually connected. The main circuit is simple in structure, and each phase winding is divided into two branchesconnected in parallel, so that the effect of enhanced excitation is achieved. The storage battery of the excitation power supply has an automatic charging function, and the bidirectional DC-AC-DC ensures that the switched reluctance motor can generate power when operating clockwise and electrically operates in counterclockwise direction. The functions of isolation, high-frequency transformation and high voltage gain is provided. The interleaved control mode during electric operation in counterclockwise direction can reduce the torque pulse. The system is more suitable for power generation/ electric operation in different time period.

The present invention discloses a method and system for position estimation of a switched reluctance motor on the basis of a pulse current envelope, belonging to the field of the switched reluctance motor control technique. The method for position estimation of the switched reluctance motor on the basis of the pulse current envelope comprises: performing initialization setting, extracting a pulse current envelope of a non-conducting region, extracting a pulse current envelope of a conducting region, extracting a complete period pulse current envelope, and determining positions, etc. The system for position estimation of the switched reluctance motor on the basis of the pulse current envelope comprises: an initialization module, a module of extracting a pulse current envelope of a non-conducting region, a module of extracting a pulse current envelope of a conducting region, a module of extracting a complete period pulse current envelope, and a position determination module. The method and system for position estimation of a switched reluctance motor on the basis of a pulse current envelope are simple, are capable of effectively estimating a position of a motor rotor, and are high in versatility, with no need for additional hardware.

A rotary-type hydrodynamic valve is provided, which comprises a hydraulic motor, a valve and a supporter connecting the hydraulic motor with the valve. The top end of the valve rod of the valve is in thread connection with a driving screw which is arranged on the hollow output shaft of the hydraulic motor. When the hydraulic motor runs, the driving screw on the hollow output shaft can drive the valve rod to rotate and thus to move a valve plate up and down, thereby opening or closing the valve. The inventive rotary-type hydrodynamic valve has large starting torque; can change the driving torque along with the load change when opening or closing the valve; can set, display and control the opening or closing state of the valve; can ensure the valve to be opened or closed reliably and safely; can prolong the service life and reduce the noise; and can improve the automation degree and allow the manual operation.

The present invention discloses a motor driving system used for workover treatment. The motor driving system used for workover treatment is characterized in that a three-phase power supply is connected with a controllable rectifier via a filter circuit A, the rectification output end of the controllable rectifier is connected with a filter circuit B and a frequency converter orderly via a DC bus, and the output end of the frequency converter is connected with the power supply input end of a frequency conversion motor; a PLC is connected with the control input ends of a super capacitor controller and the controllable rectifier separately via the on-site buses, the high voltage side anode of a bidirectional DC-DC converter is connected with the rectification output end anode of the controllable rectifier, and the high voltage side cathode of the bidirectional DC-DC converter is connected with the rectification output end cathode of the controllable rectifier; the low voltage side anode of the bidirectional DC-DC converter is connected with the anode of a super capacitor module, and the low voltage side cathode of the bidirectional DC-DC converter is connected with the cathode of the super capacitor module; the signal output end of the super capacitor module is connected with the signal acquisition input end of the super capacitor controller, and the super capacitor controller is connected with the control input end of the bidirectional DC-DC converter.