48 results about "Five phase induction motor" patented technology

A method and apparatus are described for controlling the flow of power in each input line to a three phase AC inductive load in order to reduce the amount of VAR in the system, and thus increase the operational efficiency of the inductive load. Solid state relays are positioned in series in each of the three inductive load line inputs, and current allowed to flow to the inductive load only during the time during which the SSRs are in a conducting state. The calculation of VAR is achieved by processing data from each of the input lines using a separate controller boards each dedicated to each of the lines. The controller in turn, based on the calculated VAR, increments the time, either increasing or decreasing it from a predetermined value, during which the SSRs in that line remains in the non-conducting state.

A vector-controlled, dual inverter system for a three-phase induction motor is disclosed. The inverter system comprises a first inverter system which is connected to one end of three phase windings of a stator and performs compensation of a back electromotive force; and a second inverter system which is connected to the other end of the three windings of the stator and performs reactive power compensation.

The present invention relates to an energy-saving system for three-phase induction motors and is based on the principle of variable voltage control at constant speed. It is composed of a microprocessor, exampling circuit, sensing circuit, acquiring circuit, firing circuit, and AC to AC converter. The system is to automatically adjust the voltage to the induction motor with the variation in the motor load, in order to obtain high operating power factor and efficiency. The system will result in considerable energy-savings when a three-phase induction motor runs under constant light-load or variable-load with low duty ratio.

The invention discloses a system and method for controlling an indirect torque of a single regulating loop of a three-phase induction motor and relates to the technical field of motor drive and alternated current speed regulation. The system is provided with an indirect torque controller, a 32-bit digital signal processor used as the core of the system and a corresponding peripheral circuit. The software of the system comprises a flux linkage observation and torque calculation unit, a steady slip calculation unit, a revolving speed sampling period integral unit, a torque regulator unit, a stator flux linkage vector amplitude and phase calculation unit and a space voltage vector calculating and outputting unit. Through the method provided by the invention, the space voltage vector of controlling the motor in the next period can be acquired by utilizing the efficient value formula of each-phase electromotive force of a motor stator (UE is equal to 4.44kfNF), namely the ratio of the voltage vector amplitude to the phase gain is maintained as a constant when the motion track of a stator flux linkage vector is a flux linkage circle. In the invention, only the torque single proportional-integral (PI) regulating loop is required, thus the system structure is simplified, the dynamic property of the system is enhanced, and the high-performance control of the driving system of the three-phase induction motor is realized.

The invention provides a three-phase induction motor star-delta starting control method and device. The device comprises a current and voltage detection unit, a single-chip microcomputer control unit, a human-computer interaction unit, a delta connection switching device based on a solid-state relay and an AC contactor, a star connection switching device based on the solid-state relay, a main circuit AC contactor and a thermal relay device. The current and voltage detection unit is connected on a bus and used for detecting power current and power voltage signals in real time so as to act as the basis of trigger control of the single-chip microcomputer control unit. The single-chip microcomputer control unit is connected with the current and voltage detection unit. The human-computer interaction unit is connected with the single-chip microcomputer control unit. Starting current of the starting instant of star connection can be effectively suppressed so that the current impact of star-delta switching can be reduced, the electromagnetic interference caused by disconnection of a stator winding in the star-to-delta process can also be reduced and thus noise and vibration of starting of an asynchronous motor can be greatly reduced.

The invention discloses an instantaneous power detection and load identification based induction motor cooperative control system which realizes energy-saving control on a light-loaded or unloaded three-phase induction motor and mainly comprises an instantaneous power detection and load identification cooperative controller using a digital signal processor TMS320F28346 as a core, a three-phase bridge power amplifier, a three-phase bridge driving circuit, the three-phase induction motor, a three-phase diode rectifier bridge, an instantaneous power detection link, a current detection link, a coder rotating speed detection link, a load identification link, a +24V switch power source, a +15V switch power source, a + / -12V switch power source, a +5V power source and the like. An instantaneous power detection and load identification based induction motor cooperative control method is adopted to control stator exciting current of the light-loaded or unloaded three-phase induction motor, and power factors of the three-phase induction motor are adjusted by load rate obtained on the basis of load identification, so that operating efficiency of the three-phase induction motor is effectively improved, and good electricity-saving effect is achieved.

A system and method for driving a three-phase induction motor, wherein an inverter power module is provided to supply voltages of three phases to the three-phase induction motor to drive it, a plurality of power supplies are provided to supply powers to a plurality of power devices constituting the inverter power module, and an insulator is provided to insulate the plurality of power supplies and the power module from each other. The present invention can minimize interferences based on a difference between voltages continuously applied to the inverter power module while the three phase voltages are supplied from the inverter power module to the three-phase induction motor. Furthermore, a plurality of photocouplers and a plurality of driving devices constituting the insulator are disposed on a printed circuit board in such a manner that they are spaced apart from one another, thereby minimizing interferences among powers, the amount of abnormal leakage and the effect of a voltage variation on the three-phase induction motor.

The invention discloses a vector observation method for estimating the rotor position and speed of an electric forklift motor, using a low-resolution motor rotor position sensor, such as a Hall element, a low-precision incremental photoelectric encoder of 80 or 100P / R, and constructing A vector observer realizes the indirect measurement of the rotor position angle and rotational speed of the phase induction motor; the present invention proposes an algorithm through harmonic decoupling, from the discrete rotational position vector H αβ The vector tracking observer, which extracts continuous rotor position information from the vector tracking observer, realizes the accurate estimation of the rotor position angle and the accurate measurement of the rotational speed of the three-phase induction motor using the low-resolution rotor position sensor.

The invention provides an electronic braking system for an irrigation machine. According to an exemplary preferred embodiment, the present invention includes a drive controller including a power supply circuit that signals an on-state when a power request is input into the drive controller, and when power is not input Signals a disconnected state when entering the system. According to another preferred embodiment, the invention also comprises a three-phase induction motor connected to apply torque to a drive shaft connected to at least one drive wheel. According to another preferred embodiment, the power supply circuit provides power of 480V AC to the drive motor when the drive controller sends an on-state signal, and provides 10-80V to at least one phase of the motor when the drive controller sends an off-state signal The DC's are non-powered. According to another preferred embodiment, the application of DC current is applied immediately after removal of power from the drive motor, and non-powered application of the brakes prevents the drive shaft from rotating until the DC current is removed.