27results about "Single-phase induction motor starters" patented technology

The invention relates to a starting method and system of an efficient variable-frequency low-temperature compressor. The method comprises the steps that state sensing processing is conducted on working condition parameters of a compressor in the starting stage, and starting disturbance characteristics representing current offset characteristics are obtained; mapping the starting disturbance characteristic into a current adjustment coefficient based on the current offset characteristic, and performing parameter distribution adjustment processing on the feed-forward current compensation model to obtain a feed-forward compensation estimated value; and according to the instantaneous difference value between the current current response collected in real time and the feedforward compensation estimated value, feedback correction is conducted on the current adjusting coefficient to obtain a current compensation instruction, so that the control current is adjusted, and the compressor is driven to complete stable starting under the low-temperature condition according to the adjusted control current. By means of the method, the stability and adaptability of the compressor starting process can be improved in the low-temperature environment.

There is provided an induction machine (100) comprising a rotor (120); a stator (140); and a phase-shift oscillator (160). The stator comprises: a first winding (141); and a second winding (142), arranged at a first angle (101) relative to said first winding. The phase-shift oscillator comprises: a transistor (170), the transistor (170) being a high-electron mobility transistor, HEMT; and a phase-shift network (180). The first winding is connected to a first node (181) of the phase-shift network and wherein the second winding is connected to a second node (182) of the phase-shift network, wherein the phase-shift oscillator is configured to provide a first phase electric signal at the first node and a second phase electric signal at the second node, wherein a difference between the first and second phase corresponds to the first angle. There is also provided an electric aircraft propulsion system comprising the induction machine.

The invention relates to the technical field of starters, and relates to an electronic starter and a control method thereof, and the electronic starter comprises an electronic switching circuit which is used for controlling the on-off of the current of a secondary winding of a motor; the trigger circuit comprises a rectifier bridge, a first triode, a second triode and an MOS tube; and the bias circuit is connected with the base electrode of the first triode, and the bias circuit is used for transmitting bias current to the base electrode of the first triode. According to the invention, the working current of the electronic starter after the motor is started is limited at a microampere level through the resistor with a relatively large resistance value, so that the energy consumption of the electronic starter during the normal operation period of the motor is obviously reduced.

This application relates to the field of single-phase asynchronous motor technology, and discloses a single-phase asynchronous motor starting control circuit with anomaly detection. The circuit includes an MCU control unit, a main thyristor, a secondary thyristor, an electrical metering chip, and a protection circuit. The main thyristor, the secondary thyristor, the electrical metering chip, and the protection circuit are directly or indirectly electrically connected to the MCU control unit. The MCU control unit executes control logic, which not only precisely controls the on and off timing of the main and secondary thyristors to optimize the motor starting process and reduce starting shock, but also judges abnormal states based on real-time current and voltage data provided by the electrical metering chip and quickly takes protective measures when an anomaly is detected. Furthermore, it records key operating parameters when an abnormal state occurs, providing a basis for subsequent fault analysis, greatly simplifying the fault diagnosis process and reducing maintenance costs.

Enhanced network power factor corrective designs are presented that can use corrective devices that achieve long-term, operationally stable mechanical work. Embodiments can utilize reverse-winding induction motor designs with engineerable parameters and configurations for the reverse winding (13) in systems and through methods where an inductive motor (1) can present a current that leads voltage and a leading power factor (16) to correct other existing induction motors (8) in an initial network (9) or be optimized for a particular application. Designs also present a power factor correction that can present a variable correction without altering the character or physical capacitive value of an electrical correction component. Individual induction motors that have leading current and a leading power factor (16) can be provided to improve reverse winding induction motors. Progressive start controls (23) can also be used in a manner that limits inrush current to operational levels with passive current establishment control where reverse winding (13) effects can be used and perhaps even delayed to passively limit and even effect a current decrease while rotational acceleration continues after initial start transition.

A soft-start system for power tools is described. The soft-start system uses a direction feedback signal from the power tool's direction selection switch. A power tool using this soft-start system is also described. Additionally, a power supply circuit using the soft-start system is described.

A thyristor element assembly structure comprises a first radiator (50), a second radiator (70) and a thyristor element (5) sandwiched between the first radiator and the second radiator, wherein the thyristor element (5) is connected with the first radiator (50) and the second radiator (70) that are on both sides of the thyristor element by means of a plurality of insulating fasteners (10), the thyristor element (5) comprises a gate assembly (80) and a chip packaging assembly (60), the chip packaging assembly (60) comprises a first packaging shell (606) and a second packaging shell (601), the first packaging shell and the second packaging shell enclose a packaging cavity, the second packaging shell (601) is provided with a blind hole (608) which is at least partially and fixedly connected to the gate assembly, side walls of the blind hole (608) serve as a portion of cavity walls of the packaging cavity, and the gate assembly (80) is fixedly engaged to the blind hole (608) of the chip packaging assembly.

A system for controlling an AC motor is provided. The system comprises an electrical connection path for connecting an electrical input of the AC motor to a first phase of alternating current from an electric power supply. The system also comprises two or more motor controllers, each motor controller is located on the electrical connection path between the electric power supply and the AC motor and is operable to regulate current of the first phase passing through it. Each motor controller is connected in parallel, relative to the other motor controllers, to the electrical connection path. At least one processor is configured to control the motor controllers to repeatedly change which of the motor controllers current of the first phase passes through, such that at any given time current of the first phase only passes through one of the motor controllers. A corresponding method is also provided.

Enhanced network power factor corrective designs are presented that can use corrective devices that achieve long-term, operationally stable mechanical work. Embodiments can utilize reverse-winding induction motor designs with engineerable parameters and configurations for the reverse winding (13) in systems and through methods where an inductive motor (1) can present a current that leads voltage and a leading power factor (16) to correct other existing induction motors (8) in an initial network (9) or be optimized for a particular application. Designs also present a power factor correction that can present a variable correction without altering the character or physical capacitive value of an electrical correction component. Individual induction motors that have leading current and a leading power factor (16) can be provided to improve reverse winding induction motors. Progressive start controls (23) can also be used in a manner that limits inrush current to operational levels with passive current establishment control where reverse winding (13) effects can be used and perhaps even delayed to passively limit and even effect a current decrease while rotational acceleration continues after initial start transition.

The invention relates to an electric motor device (10) comprising: a first circuit branch (12) and a second circuit branch (14) connected in parallel with the first circuit branch (12), the first circuit branch (12) comprising a main winding (16) and the second circuit branch (14) comprising an auxiliary winding (18) and a capacitor (20); and a phase-angle controller (22) connected in series with the main winding (16). The aim of the invention is to provide an electric motor device of this type with improved power control. This is achieved in that the phase-angle controller (22) is connected in parallel with the second circuit branch (14).

The embodiment of the utility model discloses a motor control circuit, a circuit board and a clothes airing machine. The motor control circuit comprises a forward and reverse rotation switch module, a first energy release module, a second energy release module and a slow start and slow stop module, forward rotation or reverse rotation of a motor can be achieved by arranging the forward and reverse rotation switch module, and when the motor is started, the motor can be controlled to be started slowly through the slow start and slow stop module and the forward and reverse rotation switch module. When the motor stops, back electromotive force energy generated when the motor stops rotating forwards or reversely can be released through the first energy release module and the second energy release module, and therefore the forward and reverse rotation switch module is protected, normal starting and stopping of the motor control circuit are guaranteed, and the safety of the motor control circuit is improved.

The invention relates to an electric motor device (10) with a first circuit string (12) and a second circuit string (14) connected in parallel to the first circuit string (12), wherein the first circuit string (12) has a main winding (16) and the second circuit string (14) has an auxiliary winding (18) and a capacitor (20), and with a phase angle control (22) connected in series with the main winding (16). In order to provide a generic electric motor device with improved power regulation, it is proposed that the phase angle control (22) be connected in parallel to the second circuit string (14).

A kind of commercial refrigeration compressor motor starter structure matched with electrical junction box, including motor starter assembly, assembly includes starter box body, starter box body cover, first, second PTC and first, second electrode sheet, starter box body cover is embedded with starter box body, the middle part of starter box body has PTC installation cavity, rear end has current control mechanism cavity, front end has starting capacitor electrical connection foot cavity, PTC installation cavity is separated by rear partition between current control mechanism cavity, PTC installation cavity is separated by front side wall between starting capacitor electrical connection foot cavity, the rear end of first electrode sheet has the flexible pressing foot of PTC electrical contact controlled silicon control, middle part has the flexible pressing foot of second PTC upper side electrical contact, front end has starter capacitor electrical connection foot, the rear end of second electrode has the flexible pressing foot of bidirectional thyristor electrical contact, middle part has the flexible pressing foot of second PTC lower side electrical contact.Advantages: modular effect is good, meet the matching installation requirement of fast and efficient.

To provide an induction machine having an improved weight output ratio.SOLUTION: An induction machine comprising a rotor, a stator and a phase shift oscillator is provided. The stator includes a first winding and a second winding disposed at a first angle relative to the first winding. The phase shift oscillator comprises a transistor that is a high electron mobility transistor, and a phase shift circuit. The first winding of the induction machine is connected to a first node of the phase shift circuitry, the second winding is connected to a second node of the phase shift circuit, the phase shift oscillator is configured to provide a first phase electrical signal at the first node and a second phase electrical signal at the second node, and a difference between the first phase and the second phase matches the first angle. Also, an electric aircraft propulsion system comprising the induction machine is provided.SELECTED DRAWING: Figure 1

A converter for an air conditioning system includes a rectifier section configured to receive a multiphase, AC input voltage; a voltage regulator section coupled to the rectifier section, the voltage regulator section configured to control a DC output voltage across a positive DC bus and a negative DC bus; and a controller in communication with the rectifier section and the voltage regulator section, the controller configured to control the converter in a first mode or a second mode in response to a transient detected in the converter.

An induction motor (100) is provided, comprising: a rotor (120); a stator (140); and a phase-shift oscillator (160). The stator comprises: a first winding (141); and a second winding (142) arranged at a first angle (101) with respect to the first winding. The phase-shift oscillator comprises: a transistor (170), which is a high electron mobility transistor, HEMT; and a phase-shift network (180). The first winding is connected to a first node (181) of the phase-shift network, and wherein the second winding is connected to a second node (182) of the phase-shift network, wherein the phase-shift oscillator is configured to provide a first phase electrical signal at the first node and a second phase electrical signal at the second node, wherein a difference between the first phase and the second phase corresponds to the first angle. An electrically powered aircraft propulsion system comprising the induction motor is also provided.

A power supply unit includes a first capacitor having a first capacitance, a second capacitor having a second capacitance, a power control, and a power-side connector having a plurality of power-side contacts including a first power-side capacitor contact electrically connected to the first capacitor, a second power-side capacitor contact electrically connected to the second capacitor, a first power-side power contact electrically connected to the power control, a second power-side power contact electrically connected to the power control, and a power-side ground contact electrically connected to a ground source. The power-side connector includes one of a plug and a socket configured for mating connection with a corresponding one of a socket and a plug of a motor for electrically connecting the power supply unit and the motor.

An electronic starting switch assembly and control methods for a dryer having a split-phase induction motor. The assembly comprises a microcontroller unit (MCU) configured to execute a control method that dynamically manages the motor's operation by monitoring the forward magnitude current. The MCU determines a stabilized startup forward magnitude current and calculates a crossover condition, allowing for precise control of the motor's transition to single-phase operation by disconnecting the auxiliary winding and connecting the heater element based on real-time forward magnitude current analysis and processing. The system can also monitor for overload conditions indicative of rotor speed drops and can re-engage the auxiliary winding to maintain motor performance. The assembly includes a housing with a heat-sink for efficient thermal management and environmental protection of electronic components. The disclosed method provides a robust solution for efficient dryer operation by ensuring accurate control of motor start-up, running conditions, and overload protection.

A hard start capacitor replacement unit has a plurality of capacitors in a container sized to fit in existing hard start capacitor space. The capacitors are 4 metallized film capacitors wound in a single cylindrical capacitive element. The container has a common terminal and capacitors value terminals for the plurality of capacitors, which may be connected singly or in combination to provide a selected capacitance. An electronic or other relay connects the selected capacitance in parallel with a motor run capacitor. The hard start capacitor replacement unit is thereby adapted to replace a wide variety of hard start capacitors.

The utility model is suitable for the technical field of motor starters, and provides a shield pump single-phase motor silicon controlled rectifier starter module, which comprises a thyristor starter electrically connected with a shield pump single-phase motor. A starting winding and an operation winding which are connected in parallel are arranged in the shielding pump single-phase motor. The starting winding is connected in series with a power output resistor; the thyristor starter comprises a silicon controlled rectifier, a bimetallic electrostriction blade delay switch and a heating resistance wire; compared with traditional resistor split-phase starting, capacitor starting, centrifugal switch starting and the like, the device has the advantages that the size is smaller, the stability is higher, the starting torque is larger, the device is not limited by temperature, and the starting speed is higher. A single-phase motor of the submerged shield pump is broken through, and the submerged shield pump can be efficiently started and operated without using a capacitor, a centrifugal switch or a PTC (Positive Temperature Coefficient) starter and other devices traditionally.

A motor drive method comprising: obtaining a frequency variation curve corresponding to a single-phase induction motor, wherein the frequency variation curve is configured to indicate multiple set frequencies, and comprises a target frequency; providing a power command to the single-phase induction motor, wherein an initial frequency of the power command is less than the target frequency; when one of the multiple set frequencies corresponding to the present time is greater than the initial frequency, controlling the present frequency of the power command according to the frequency variation curve; when one of the multiple set frequencies is less than or equal to the initial frequency, maintaining the present frequency; when the output current is greater than or equal to the current threshold, fixing the present voltage; and when the output current is lower than the current threshold, increasing the present voltage.

To provide an enhanced network power factor correction design that may use correction devices that achieve long-term operationally stable mechanical work. [Solution] Embodiments utilize a reverse-wound induction motor design with engineerable parameters and configurations for the reverse windings (13) in a system and through a method in which an induction motor (1) can exhibit a current leading voltage and a leading power factor (16) to correct other existing induction motors (8) in an initial network (9), or can be optimized for a specific application. The design also exhibits power factor correction that can exhibit variable correction without modifying the characteristics or physical capacitance values ​​of the electrical correction components. Individual induction motors with leading current and leading power factor (16) can be provided to improve the reverse-wound induction motor.

Improved reverse-winding induction motors are presented that can achieve performance that was not previously possible and that teach new ways to configure and utilize the reverse- winding class of motors. Embodiments can present reverse-winding induction motor (1) designs that have at least one drive stator-coordinated reverse magnetic system (8), at least IE4-total motor- efficiency reverse magnetic stator system (9), at least one rated-full load slip-minimized reverse magnetic stator system (10), at least one exorbitantly-sized, reverse magnetic effect-boosting reverse magnetic stator system (24), and even at least one nearly joule effect breakdown current density reverse magnetic stator system (26). New factors and new relationships to configure reverse stator capacitor(s) are disclosed that can achieve improvements in efficiency, slip, and power factor beyond what was previously understood as the limit of performance for a reverse- winding class of induction motor.

A system including an electric motor of a compressor system and a controller is disclosed. The electric motor includes a switch configured to provide line frequency power to the electric motor to drive the electric motor at a full speed, and an inverter to provide variable frequency power to the electric motor to drive the electric motor at a variable speed. The controller is configured to determine whether the switch is closed in response to powering up the electric motor and before supplying the variable frequency power to the electric motor from the inverter. The controller is configured to prevent supply of the variable frequency power to the electric motor from the inverter to prevent damage to the inverter based on the determining that the switch is closed and generate an alert notification to notify a user of a fault in the switch.

An electronic starter circuit belongs to the technical field of refrigeration compressor motor starting. Comprising a first positive temperature coefficient thermistor PTC1, a second positive temperature coefficient thermistor PTC2 and a bidirectional silicon controlled rectifier T. A first pole T1 of the bidirectional silicon controlled rectifier T is connected with a motor secondary winding leading-out end S. A second pole T2 of the bidirectional silicon controlled rectifier T is connected with one end of the first positive temperature coefficient thermistor PTC1. A trigger electrode G of the bidirectional silicon controlled rectifier T is connected with one end of the second positive temperature coefficient thermistor PTC2, the other end of the first positive temperature coefficient thermistor PTC1 and the other end of the second positive temperature coefficient thermistor PTC2 are jointly connected with a leading-out end M of a main winding and a secondary winding of the motor, and a capacitor C1 is connected between a first electrode T1 of the bidirectional silicon controlled rectifier T and the trigger electrode G. The advantages are that the anti-interference capability of the bidirectional silicon controlled rectifier T is increased, and the working reliability of the motor is improved; components are few, the circuit is simple, and cost is low.

The application provides a material conveyor circuit and a material conveyor, wherein the circuit comprises: a motor provided with a main winding and an auxiliary winding; a forward rotation control module connected with the main winding and the auxiliary winding respectively; a reverse rotation control module connected with the main winding and the auxiliary winding respectively; a first capacitor and a second capacitor, the forward rotation control module is connected with the first capacitor and the second capacitor respectively, and the reverse rotation control module is connected with the first capacitor or the second capacitor. The motor corresponds to different capacitor sizes when switching to forward rotation and reverse rotation, so that the motor has sufficient capacitor size when ascending in forward rotation, which is beneficial to easier starting and more stable operation of the motor, the capacitor size is reduced when descending in reverse rotation to avoid excessive capacitor, which is beneficial to reducing energy consumption and avoiding overheating of the motor, and the difference between ascending and descending in the material transportation process is adapted.