1406 results about "Motor protection" patented technology

A contactor for connecting a medium voltage load, such as a medium voltage three-phase motor, to a medium voltage electrical source, such as a medium voltage three-phase electrical source, and for providing protection functionality for the load includes one or more electrical conductors each having separable contacts such that the load is selectively electrically connected to the source, and one or more current transducers each operatively coupled to a respective one of the electrical conductors for measuring a current thereon. A processor is in electronic communication with the one or more current transducers, and a memory is in electronic communication with the processor. The memory stores one or more routines executable by the processor that are adapted to perform one or more protection functions for the load based on the current measured by each of the one or more current transducers and to selectively open and close the separable contacts of each of said electrical conductors.

In a refrigerant cycle system, a compression mechanism of an electric compressor sucks and compresses refrigerant, and an electric motor that drives the compression mechanism is cooled by the refrigerant. A variable throttle mechanism decompresses the refrigerant discharged from the electric compressor. A motor temperature detector detects a temperature of the electric motor. A motor protection determiner determines whether the temperature of the electric motor detected by the motor temperature detector is equal to or higher than a criterion value. A motor protection controller controls the variable throttle mechanism so that an opening degree of the variable throttle mechanism does not decrease when the motor protection determiner determines that the temperature of the electric motor is equal to or higher than the criterion value.

A system and method is provided for reducing the wear on a motor protector, particularly when used in an abrasive environment. The motor protector comprises an outer housing having an internal shaft. The motor protector further comprises a head section having an abrasives exclusion mechanism to reduce the amount of abrasive material contacting a specific component or components within the motor protector.

The invention discloses an energy-saving type single-phase alternating current machine starting protector, and belongs to the technical field of refrigerating compressor. The energy-saving type single-phase alternating current machine starting protector comprises a shell, a single-phase alternating current machine starter, a single-phase alternating current machine protector and a shell cover; a positive temperature coefficient thermistor cavity and a single-phase alternating current machine protector cavity are formed in a shell cavity; the single-phase alternating current machine starter comprises a positive temperature coefficient thermistor, a first pin and a second pin; the single-phase alternating current machine protector is arranged in the single-phase alternating current machine protector cavity; the shell cover is matched with the shell. The energy-saving type single-phase alternating current machine starting protector is characterized in that a plug-in piece is extended from a reed of the first pin, and a plug-in-piece hole, a first pin hole, a second pin hole and a protector pin hole are formed in the shell; a pair of bottom-wall top embossments are formed in the cavity bottom wall of the positive temperature coefficient thermistor cavity, side-wall top embossments are formed in the side cavity walls and the rear cavity wall, the lower portion of the positive temperature coefficient thermistor is supported by the pair of bottom-wall top embossments, the front side of the positive temperature coefficient thermistor is contacted with the front cavity wall top embossments, and the rear side of the positive temperature coefficient thermistor is contacted with the rear cavity wall top embossments. The energy-saving type single-phase alternating current machine starting protector has the advantages that the energy-saving effect is good, the size is small, and the weight is light; the installation is convenient; a mold structure is simplified; electric short-circuit is prevented; the assembling efficiency is high.

A motor protection circuit for an electric motor driven by a pulse width modulated amplifier. It has a capacitor and a first conduction path connected to a first terminal of the capacitor and connectable to a first conductor. It also has a second conduction path connected to the second capacitor terminal and connectable to a second conductor. There is a DC voltage difference between the first conductor and the second conductor. There is a third conduction path between the first terminal and the second terminal. The third conduction path having a resistance which is lower than the resistance of the first conduction path plus the resistance of the second conduction path. The third conduction path passes through a switch which has an input connection to be opened and closed thereby. The input connection is for receiving a signal indicating a motor overload condition, whereby the capacitor discharge switch is closed when the signal indicates the motor overload condition and the capacitor discharge switch is opened when the signal does not indicate the motor overload condition. A charge on the capacitor increases when the signal does not indicate the motor overload condition and the charge on the capacitor decreases when the signal indicates the motor overload condition. The circuit also has a voltage comparator receiving the voltage of the capacitor. The voltage comparator produces a signal for shutting down the motor.

The invention discloses an energy-saving integrated type single-phase alternating current motor protection device and belongs to the technical field of refrigeration compressors. The energy-saving integrated type single-phase alternating current motor protection device comprises a shell, a single-phase alternating current motor starter, a single-phase alternating current motor protector and a shell cover. A positive temperature coefficient thermistor cavity and a single-phase alternating current motor protector cavity are formed inside a shell cavity in an enclosed mode. The single-phase alternating current motor starter comprises a positive temperature coefficient thermistor, a first pin and a second pin, a first pin transition sheet and a second pin transition sheet extend from the first pin and the second pin respectively, and a first pin reed and a second pin reed are arranged on the first pin transition sheet and the second pin transition sheet respectively. The single-phase alternating current motor protector is arranged inside the single-phase alternating current motor protector cavity. The shell cover is matched with the shell and is provided with a grounding pin, a pin N and a pin L. The energy-saving integrated type single-phase alternating current motor protection device is characterized in that a pair of bottom wall protrusions are formed on the bottom wall of the positive temperature coefficient thermistor cavity, and the front wall and the back wall of the positive temperature coefficient thermistor cavity are both provided with side wall protrusions. The energy-saving integrated type single-phase alternating current motor protection device is good in energy-saving effect, small in size, light in weight, convenient and quick to install, simplified in structure and capable of preventing electrical short circuits, and guarantees the stability and reliability standards of the pins.

An starter and protector for an energy-saving integral single-phase alternating current motor, belonging to cold compressor motor protecting equipment technology field, includes a housing, a cover, a motor protector mounted in the housing, a motor starter mounted on the housing, and a plug-in sheet mechanism composed of a L plug-in sheet, a N plug-in sheet and an earthing plug-in sheet. The motor starter includes a first pin, a second pin and a positive temperature coefficient thermistor, and is characterized in that the two ends of the positive temperature coefficient thermistor are equipped with a supporting wall separately, wherein the pair of the supporting walls being parallel with each other, a rostellum being arranged on the basic centered position of the upper side of each supporting wall, the two bottom sides of the positive temperature coefficient thermistor contacting the rostellum, and the two sides of the positive temperature coefficient thermistor holding with the first and the second pins separately. The invention has well energy-saving effect, and has substantial deflated volume, which being help to save the material for manufacturing the positive temperature coefficient thermistor.

To precisely detect the temperature of a power assist motor without using a temperature sensor and enhance an overheating protection function. A calorific value calculating unit calculates a calorific value based upon the difference between a calorific value by current supplied to a motor and the quantity of heat radiation. The output of the calorific value calculating unit is accumulated and an accumulated value is input to an accumulated value buffer. A cumulative value TS acquired by adding initial temperature T0 to a cumulative value Td is input to a ratio map of a target current value, ratio is read, and a target base current value is limited according to the ratio. The cumulative value TS used in the map is not an actual motor current value and is calculated based upon unlimited current acquired in an unlimited current calculating unit.

A control device of a hybrid vehicle, configured with an engine; a motor that rotates together with the engine at least during traveling by using a driving force of the engine, and a speed change mechanism that shifts rotation of the engine and the motor to transmit the shifted rotation to a driving wheel. A zero torque control unit controls output torque of the motor to zero torque when a rotational speed of the motor reaches a predetermined rotation speed or more by driving rotation of the engine, and a motor temperature detection unit that detects a temperature of the motor. A motor protection control units that reduces a rotational speed of the engine when the temperature of the motor reaches an upper threshold value or more while the motor is being rotated at the predetermined rotational speed or more by the driving rotation of the engine.

The invention discloses a motor protection device. The device comprises a mounting plate, wherein a vehicle motor is arranged above the mounting plate, sliding rods are fixedly connected at four corners of the lower surface of the vehicle motor, sleeves corresponding to the sliding rods in position are fixedly connected to the upper surface of the mounting plate, first magnets are fixedly connected to the lower surfaces of the insides of the sleeves, the upper surfaces of the first magnets are fixedly connected with first springs, a second magnet is fixedly connected to one end, away from thecorresponding first magnet, of each first spring, the opposite sides of each first magnet and the corresponding second magnet have the same magnetism, the second magnets are glidingly connected with the sleeves, one end, away from the vehicle motor, of each sliding rod is inserted into the corresponding sleeve and extends downwards to be fixedly connected with the upper surface of the corresponding second magnet, and a T-shaped sliding chute is formed in the center of the upper surface of the mounting plate. The motor protection device is simple in structure and convenient to operate, a good damping protection function of the motor for a new-energy vehicle is guaranteed, and the cooling effect of the vehicle motor is ensured to be better.

The invention discloses an upper arm of a robot. The upper arm comprises a wrist joint power input device and a wrist joint. The wrist joint power input device comprises a fourth joint servo motor, a fifth joint servo motor, a sixth joint servo motor, and a motor protection cover. The wrist joint comprises a fourth joint reducer, a fifth joint reducer, a sixth joint reducer, a fourth joint power shaft, a fifth joint power shaft, a sixth joint power shaft, a fourth joint rotation arm, a fifth joint rotation arm and a tail-end mechanical flange. The fifth joint power shaft is arranged in the sixth joint power shaft, and the sixth joint power shaft is arranged in the fourth joint power shaft. The upper arm of the robot is compact in structure, easy to assemble, high in transmission efficiency, adjustable in gear clearance, small in overall volume of wrists of the industrial robot, flexible and portable; the fifth and sixth joints are same in modulus optimization, part specifications can be reduced, butch production can be facilitated, and the problems about dispersion of power distribution and routing of servo motor cables in an original structure can be solved.

The invention discloses a moulded case electromechanical integration three-phase AC motor protector, which is applicable to the protection of three-phase AC motors. Based on a moulded case circuit breaker or a moulded case leakage circuit breaker with a leakage protection function, the invention slightly changes the internal electric wiring, increases a special relay, a voltage loss release, three current detecting transformers and zero-sequence current transformers, and is provided with corresponding CPU and circuits outside the motor. The invention is suitable for the automatic breakdown of the three-phase AC motor in the situations of phase loss, electric leakage, overloading and rotor locking, reaching the function of motor protection and implementing the speciality and automation of the motor protection.

The protective relay for an induction motor includes a first program function which establishes a first thermal threshold value for a start condition of the motor, using a start condition thermal model. The thermal condition of the motor is determined by measuring the motor's thermal response to stimulus. A comparator compares the start condition thermal representation with the first thermal threshold value and monitors whether the first thermal threshold value is exceeded by the start condition thermal representation. A second thermal threshold value is established for a run condition of the motor, including a selected time constant which results in the time-current curves of the start and run conditions being substantially continuous. A representation of the thermal condition of the motor is then developed in response to stimulus current. A comparator then compares the run condition thermal representation with the second thermal threshold value.

A circuit for inhibiting a protection device of a motor includes first, second, and third comparators and an inhibit signal generator. The first comparator is operable to determine if a motor current signal associated with the motor exceeds a starting threshold to identify a starting state of the motor. The second comparator is operable to determine if the motor current signal exceeds an inrush threshold to identify a transition from the starting state to an inrush state of the motor. The third comparator is operable to determine if the motor current signal falls below a running threshold to identify a transition from the inrush state to a running state of the motor. The inhibit signal generator is operable to deassert an inhibit signal for inhibiting the protection device responsive to the third comparator identifying the running state.

The invention discloses a fool type self-learning motor soft on-off control device, which can realize 'de-skilled' judgment of load types and 'self-learning' 'closely following' load to change, and provide correct technical parameters for the on and off of a motor system. When the device is used, parameters are unnecessary to set and operation is also unnecessary in the using process, the device is only connected to a power supply and a motor for use, and the device can achieve the optimal on-off control for the motor, realize de-skilled use, unmanned operation, debugging free and maintenance free of products in field application, reduce the cost of user management and maintenance, and save manpower, material resources and financial resources of manufacturers. The device is also provided with multiple motor protection and communication, can be configurable networked for work, has high adaptability to various motors, can be widely used in the industries such as agriculture, textile, metallurgy, petrochemical industry, water treatment, shipping, transportation, medicament, food processing, mining, mechanical equipment and the like, and has high application value and economic value.

The invention discloses automobile spray lacquer quick drying equipment which comprises a box. A motor protection box is fixedly connected to the center position of the bottom of the inner wall of the box, a dual output motor is fixedly connected to the center position of the bottom of the inner wall of the motor protection box through a first motor installing table, first helical gears are rotationally connected to the two sides of the dual output motor through output shafts, symmetrical rotating connecting shafts are rotationally connected to the positions, located on the two sides of the dual output motor, at the bottom of the inner wall of the motor protection box, and the rotating connecting shafts penetrate the top of the inner wall of the motor protection box and extend outside the motor protection box; and second helical gears are fixedly connected to the middle portions of the surfaces of the rotating connecting shafts, and the first helical gears are connected with the second helical gears in a meshed manner. The automobile spray lacquer quick drying equipment relates to the technical field of automobile production equipment. The automobile spray lacquer quick drying equipment solves the problems that existing equipment is extremely low in drying efficiency, and safe running reliability is not high, risks are effectively prevented, and safety in the production process is improved.

The invention discloses a rotary rail shower nozzle. The rotary rail shower nozzle comprises protection covers, a visual component, a voice control component, a rotating mechanism, a nozzle, a synchronous belt, a guide rail and a large bottom plate, wherein the protection covers comprise a transmission protection cover and a motor protection cover; the rotating mechanism comprises a third waterproof motor, a hollow rotating post, a third synchronous belt wheel, a fourth synchronous belt wheel, a third waterproof motor, a fifth synchronous belt wheel and a sixth synchronous belt wheel; a camera is also mounted on the transmission protection cover. The rotary rail shower nozzle adopts three-axis linkage; through up-and-down motion of the overall nozzle, rotating motion of the overall nozzle around a horizontal axis and rotating movement of head of the nozzle, each part of the body can be easily washed; through the rotary rail shower nozzle, the visual component is used for recognizing contours of motion parts and recognizing which part shower person wants to wash according to the posture of the shower person and moving the nozzle to the specific position; the nozzle can be controlled by voice when the shower person does not want to control the position of the nozzle via the posture; intellectualization is really achieved.

A motor controller system comprises solid state switches for connection between an AC line and motor terminals for controlling application of AC power to the motor. A user input elements selects a current imbalance parameter. Current sensors sense current in each winding of the motor. A control circuit controls operation of the solid state switches. The control circuit compares the sensed currents with the selected imbalance parameter to determine if a fault condition exists.

The invention proposes a motor and a motor protection method. The method comprises the steps of arranging a discharging braking circuit and a detection control circuit between a motor switch power supply and the motor; and monitoring whether the motor is powered off or not by the detection control circuit, if yes, controlling the discharging braking circuit to discharge energy of a self-induced electromotive force and a counter electromotive force of the motor. By the motor and the motor protection method, an electrolytic capacitor at a front end can be prevented from being charged by the self-induced electromotive force and the counter electromotive force which are generated during stopping rotation of a DC motor, the system switch power supply is prevented from being started again after stopping working, the self-induced electromotive force and the counter electromotive force which are generated during stopping rotation of the motor can be converted to heat energy and are rapidly released, and rapid braking of a draught fan is achieved.

The invention discloses a double-gun power distribution direct current charger protective device, including a first rectification module, a second rectification module, a first charging gun, a second charging gun, a double charging power distribution loop and a control circuit which is used for controlling the double charging power distribution loop. The control circuit is connected between a power end and the ground. An output end of the first rectification module is connected with a first input end of the double charging power distribution loop. An output end of the second rectification module is connected with a second input end of the double charging power distribution loop. The invention uses relay contacts in the double charging power distribution loop and the control circuit for interlocking, so that a contactor is prevented from generating maloperation, and a phenomenon of mutual discharging between batteries is effectively prevented. According to the invention, the structure is simple, the circuit components are a few, the reliability is high, the cost can be effectively reduced, and large scale production and application is feasible. The invention can be widely applied to the automobile charging field.

The invention provides a sampling device for civil engineering rock-soil detection, which belongs to the technical field of rock-soil detection and comprises a support frame, a sampling unit and two groups of power units, the sampling unit comprises a sampling cylinder, an auger stem and a rotary motor; sliding parts are arranged on the inner sides of the supporting frames, the two ends of each sliding part are slidably connected with the supporting frames, motor protection boxes are arranged at the bottoms of the sliding parts, rotating motors are arranged in the motor protection boxes, sleeves are arranged at the bottoms of the motor protection boxes, the upper ends of sampling cylinders are in threaded connection with the sleeves, and blades are arranged at the lower ends of the sampling cylinders in the circumferential direction; the two power units are symmetrically arranged on the two sides of the top of the supporting frame, each power unit comprises a lifting motor, a first bevel gear, a second bevel gear, a rotating shaft, a straight gear, a force application rod and a rack, the lifting motors are arranged on the top of the supporting frame, and the power units are used for driving the sampling units to move vertically. The device can control the height of the sampling unit through the power unit, so that the sampling depth is conveniently adjusted, and the sampling barrel is pulled out.

The invention relates to a special intelligent lifting system for dynamically distributing and calculating parking spots of stereo garages. The special intelligent lifting system comprises a monitoring and managing system and a field control system, wherein the monitoring and managing system comprises a control unit, a storage unit, an inquiring unit, a parameter setting unit, an operation control unit, a real-time monitoring unit and an alarm unit; the field control system comprises a controller, a parking spot detecting device, an intelligent lifting unit and a manual control module; the controller is electrically connected to the parking spot detecting device, the intelligent lifting unit and the manual control module respectively; the intelligent lifting unit comprises a transmission device, a car carrying board, a limiting module and a motor protection module; the motor protection module is electrically connected with the transmission device; the limiting module is electrically connected with the controller; the transmission device is connected with the car carrying board; the controller is electrically connected with the control unit. Through the special intelligent lifting system, the problems that the dynamic distribution of idle parking spots of the existing stereo garages cannot be implemented and the efficiency of the lifting system is low can be effectively solved.