8results about "Single-phase induction motor starters" patented technology

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 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.

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.

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 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.