JP2024502380A - energy efficiency induction motor - Google Patents

Abstract

The present invention comprises a stator, a main winding (M) of the stator for generating a rotating magnetic field (RMF), and a rotor arranged to rotate relative to the main winding (M) of the stator by the RMF. The present invention relates to an energy efficient induction motor with. The stator comprises additional windings (A) for generating alternating current emfs induced in one or more additional windings (A) by rotation of the rotor. The alternating current EMF created in one or more additional windings (A) is simultaneously fed back to the main winding (M) of the stator throughout a complete rotational cycle of the rotor through an electronic control unit coupled to the stator. producing the resulting AC output power that is continuously supplied to the main winding (M) of.

Description

The present invention relates generally to energy-efficient induction motors, and more particularly, by collecting and manipulating the EMF generated in the stator windings and thus supplementing a significant portion of the power requirements for driving the motor, the same Regarding induction motors that consume less current compared to capacity conventional motors.

With the extreme increase in energy demand, various sectors, industries or others are looking to adopt sustainable forms of energy and utilize renewable energy sources. This is associated with the need to provide energy efficiency devices that manage and store the energy/power produced to match energy requirements and demands.

With the evolution of technology, electric motors have been used in industry as the main driving power in various applications that require excessive use of energy resources. In particular, induction motors, such as three-phase induction motors, are mainly used in the industrial and agricultural sectors, and these motors consume 65% of the total energy produced. Therefore, there is a need to save a significant amount of energy compared to standard motors currently in use. There is also a need to design energy efficient motors to reduce the running costs of such motors with improved efficiency.

There are basically two types of induction motors, depending on the type of input power to the motor and the type of rotor. Based on the type of input power source, induction motors are classified as single-phase induction motors, and three-phase induction motors. Based on the type of motor, induction motors are classified as squirrel cage motors and slip ring motors or wound type.

Below is an example of the working principle of an induction motor. When the stator windings of an induction motor are supplied with AC input power, an alternating current flux is created around the stator windings by the AC input power. This alternating flux rotates at a synchronous speed. The rotating flux is called a "rotating magnetic field" (RMF).

The relative velocity between the stator RMF and the rotor conductor results in an induction emf in the rotor conductor according to Faraday's law of electromagnetic induction. The rotor conductors are shorted and therefore rotor current is created by the induced emf. Due to its operating mechanism, such motors are called induction motors. This is similar to the operation that occurs in a transformer, so induction motors are also called rotary transformers.

The induced current within the rotor also creates an alternating current flux around it. This rotor flux lags behind the stator flux. According to Lenz's law, the direction of the induced rotor current is such that it tends to oppose the cause of its production. The rotor tries to catch up with the stator RMF because the cause of rotor current production is the relative speed between the rotating stator flux and the rotor. Therefore, the rotor rotates in the same direction as the stator flux to minimize relative speed. However, the rotor does not succeed in keeping up with the synchronous speed of the rotating stator flux or RMF. This is the basic working principle of both single-phase and three-phase induction motors.

In three-phase induction motors, a three-phase supply is used to balance the high current consumption. Therefore, a three-phase supply requires operating an induction motor with a 3 HP rating or higher.

Energy efficiency of electric motors, especially induction motors, is a highly researched area. By increasing the efficiency of induction motors, it is possible to store very large amounts of energy. Industrial efficiency standards are difficult to achieve by using traditional design approaches for designing induction motors.

In currently existing high-efficiency induction motors, design changes are made by incorporating high-quality cores and winding materials to improve the motor's operating efficiency. Such design changes are not cost effective. In recent years, considerable research and investment has been made on the energy saving side, instead of using high quality materials, and efforts are being made to improve the current efficiency of electric motors through various design variants.

Squirrel cage induction motors are often preferred for fixed speed applications. However, due to significant winding losses, current induction motors with optimal efficiency are not commercially available. The use of amorphous cores and copper rotor bars are other solutions that have been implemented to increase efficiency, but such solutions lead to an overall increase in costs and their implementation across the industry is not realized. Sometimes it's not possible.

WO 2005/000001 relates to electric drive system design. The electric forklift alternating current drive system is a squirrel cage induction motor. The three-phase windings are arranged in slots on the inner peripheral surface of the stator. The closed rotor generates a rotating magnetic field that generates an electric current. The three-phase winding space of the electric forklift alternating current drive system is arranged with a 120° potential difference. The rotor type, which is a squirrel cage rotor, is formed by cast aluminum strips within the rotor outer edge slots. The voltage is 48V after constant voltage frequency analogy control uses sinusoidal pulse width modulation (PWM) and DC/AC inverter for inversion. The fundamental frequency of the electronic motor is the same as the frequency of the sinusoidal reference voltage. The components required by alternating current electronic motors are greatly reduced, easily damaged parts do not need regular replacement, and little maintenance is required. Compared with direct current electronic motors, electronic motors are more efficient, more stable, and more durable.

US Pat. No. 5,001,000 discloses a motor protecting an improved energy economizer for an induction motor. A standard unmodified AC induction motor is excited from a sinusoidal source through a signal-responsive wave modifier operable to control a portion of each cycle of the sinusoidal wave coupled from the source to the stator windings. with its stator windings. An improved motor current demodulator produces a signal for controlling a wave modifier, thereby changing the efficiency related parameters and in response to each increase in said current from zero to an excessive stator winding inflow current. Maintaining optimal motor efficiency with motor load and power changes, the signal also inhibits the wave changer, thereby reducing the power consumption under excessive input current conditions, excessive motor temperature, or potentially damaging combinations thereof. It also controls a motor protection circuit that de-energizes the stator windings.

WO 2005/000032 relates to voltage and frequency controlled AC wave modifiers. A standard unmodified AC induction motor is excited from a sinusoidal power source through a signal-responsive wave modifier operable to control a portion of each cycle of the sinusoids coupled to the stator windings. has its stator windings. A load sensing means comprising a relatively small AC generator coupled to the rotor of the motor increases the field density in the stator windings with increasing loads on the motor and decreases the field density in the stator windings with decreasing loads. To control the wave modifier, a control signal is created that varies with the load on the motor.

U.S. Pat. No. 5,300,300 discloses an energy saving AC power control system for exciting an induction motor. Here, the frequency of the sinusoidal power source is twice the frequency to provide short bursts of energy to reduce the total power input for low power requirements with a low fixed ratio versus a variable ratio for slow operation. A sinusoidal power supply is described connected through a TRIAC to a control system with a gate electrode excited by a sequence of sawtooth control signals having a repetition rate.

US Pat. No. 5,001,201 discloses electronic communication for a direct current electric motor. A direct current electronic motor comprises a stator consisting of a plurality of coils interconnected with each other and a plurality of gated solid state rectifiers responsive to forced communication below a certain rpm and self communication above said rpm, these rectifiers is connected to the coil junctions for selectively passing current into or from the stator coil junctions by which the rectifier is operated. This creates multiple stator poles that are angularly displaced from the poles of the motor's rotor and shift in position as the rotor rotates. A plurality of trigger assemblies are provided for controlling the excitation of the various gate electrodes, each trigger assembly having its resonant frequency varied by the position of the magnetic element that is moved relative to the pickup coil as the rotor rotates. It includes a pickup coil that forms part of the frequency selection circuit. The sine wave oscillator is coupled to a frequency selection circuit within the trigger assembly, the oscillator is operated to produce one of two different output frequencies, and an electronic switch responsive to the speed of rotation of the rotor selects the output frequency of the oscillator. selectively change. One of these frequencies includes trigger assembly operation at all rotor positions and advanced SCR trigger timing for reliable starting and very slow operation. Other frequencies slow down the SCR trigger timing for most efficient motors operating at medium and high speeds.

US Pat. No. 5,200,303 discloses energy economizer control current initiation and protection for induction motors. This document is operable to generate voltage pulses related to incoming current parameters for control of a sinusoidal portion of the power input to the stator windings in order to reduce the current to the motor during low loads. A sample transformer is listed. It is further limited to "manually settable means" for selecting the maximum value of the motor torque during the starting operating mode.

U.S. Pat. No. 5,203,003 describes a method of using an efficiency maximizing motor controller to an induction motor with a digital signal processor (DSP) that calculates and optimizes the supply of current and mains voltage for an existing motor load from a power source through a control element. It is disclosed that the power transmission is as follows. The control elements may include standard TRIACs, field effect transistors, insulated gate bipolar transistors, three-quadrant TRIACs, or other selective control elements. Digital calculations of current requirements and motor control feedback for motor load and other motor parameters are calculated in millionths of a second to provide motor current optimization for all motor usage conditions. Advantageously, the calculation of the motor load requirement for current and the supply of that current is simultaneous.

Energy efficient induction therefore consumes less current compared to any conventional motor of the same capacity and efficiently harvests the power produced by the motor to supplement the main part of the power requirement to drive the motor There is a demand for motors.

Limitations and shortcomings of conventional and traditional approaches will become apparent to those skilled in the art through a comparison of the systems described in some aspects of the invention, as described in the remainder of this application and with reference to the drawings. Dew.

China Utility Model No. 201663527 US Patent No. 4,414,499 US Patent No. 4,382,223 US Patent No. 4,864,212 US Patent No. 4,341,984 US Patent No. 4,636,702 US Patent No. 6,489,742

The main objective of the present invention is to consume less current and compromise on input power requirements compared to conventional motors of the same capacity, in order to compensate for the main part of the power requirements for operating the motor. The object of the present invention is to develop an energy efficient induction motor that can be operated by a single phase mains AC power supply instead of a three phase mains AC power supply for all power requirements.

Another object of the invention is to develop an energy efficient induction motor with an exclusively designed electronic module combined with a tailored stator winding design, best suited to guarantee higher current efficiency. It is to be.

Another object of the present invention is to develop an energy efficient induction motor, the stator winding of which is continuously fed by an alternating current emf generated in the stator winding during a complete rotation cycle of the rotor. The AC EMF (generated EMF) thus serves as the main supply power source during continuous operation of the motor.

Another object of the invention is to design a single phase induction motor with lower electrical, magnetic and thermal losses compared to a three phase motor for the same power requirements. Additionally, magnetic and thermal losses are less compared to three-phase motors with the same output power requirements.

Another objective of the present invention is to design an energy efficient induction motor that can be manufactured industrially and is cost effective, thereby making it widely available in the industrial and agricultural sectors for a wide range of application possibilities. It is possible.

Consumes less current compared to a conventional motor of the same capacity as shown in and/or described in at least one of the drawings, as more fully described in the claims. An energy efficient induction motor is disclosed.

An energy efficient induction motor comprises a stator with a main winding for generating a rotating magnetic field (RMF) when main AC power is provided to the stator's main winding, and the RMF causes the stator's main winding to rotate relative to the stator's main winding. and a rotor arranged as shown in FIG. The stator further includes one or more additional windings for generating alternating current EMFs induced in the additional windings by rotation of the rotor. The alternating current emf produced in one or more additional windings is then collected, manipulated, and simultaneously applied to the main windings of the stator through a complete rotational cycle of the rotor through an electronic control unit (ECU) coupled to the stator. Feedback will be given. The energy thus created during rotation of the rotor satisfies the main part of the energy requirements of the induction motor when the motor functions partly as a generator.

The alternating current EMF created in one or more additional windings is supplied to the ECU. The ECU includes a rectifier circuit for converting the AC voltage of the main AC power supply and the alternating current EMF created in one or more additional windings into respective DC power. The resulting DC power is obtained by adding the respective DC powers.

The obtained DC power is then converted into the obtained AC output power by an inverter circuit within the ECU. The ECU includes a variable frequency drive (VFD) control module configured to vary the voltage and frequency of the resulting AC output power.

The ECU also includes a frequency synchronization circuit configured to synchronize the frequency of the main AC power source and the frequency of the resulting AC output power. At this stage, the ECU may disconnect the direct main AC power to the stator via the disconnect switch, and the stator is continuously supplied with only the AC output power obtained by the ECU.

These and other features and advantages of the present invention may be understood by considering the following detailed description of the invention, taken in conjunction with the accompanying figures, and like reference numerals refer to like parts throughout. say.

1 is a schematic diagram illustrating various components and operation of an energy efficient induction motor, according to an exemplary embodiment of the invention. 1 is a diagram of a stator of an energy efficient induction motor according to an exemplary embodiment of the invention; FIG. 1 is a diagram of a rotor of an energy efficient induction motor according to an exemplary embodiment of the invention; FIG. 1 is a diagram of a stator winding of an energy efficient induction motor showing terminals, according to an exemplary embodiment of the invention; FIG. 2 is a diagram of power generated within a set of stator windings, according to an exemplary embodiment of the invention; FIG. FIG. 3 illustrates flux distribution within a set of stator windings, according to an exemplary embodiment of the invention. FIG. 3 is a diagram illustrating power line distribution for an energy efficient induction motor, according to an exemplary embodiment of the invention. 2 is a schematic diagram of an electronic control unit (ECU) for collecting power/energy generated in additional windings of a stator of an energy efficient induction motor, according to an exemplary embodiment of the invention; FIG. 2 is a simplified schematic diagram of an ECU for collecting power/energy generated within multiple windings of a stator of an energy efficient induction motor, according to an exemplary embodiment of the invention; FIG. 1 is a schematic diagram of an ECU for controlling supplied power/energy to create torque to drive an energy efficient induction motor load, according to an exemplary embodiment of the invention.

The implementation described below includes a stator with a main winding for generating a rotating magnetic field (RFM) when main AC power is provided to the main winding of the stator, and a rotating magnetic field with respect to the main winding of the stator due to the RMF. and a rotor arranged to do so. The stator further includes one or more additional windings for creating an alternating current EMF induced in the one or more additional windings by rotation of the rotor. The alternating current emf created in one or more additional windings is then collected, manipulated, and simultaneously fed to the main windings of the stator throughout a complete rotational cycle of the rotor through an electronic control unit (ECU) coupled to the stator. be done. The energy thus created during rotation of the rotor satisfies most of the energy requirements of an induction motor when the motor acts partly as a generator.

The alternating current EMF created in one or more additional windings is supplied to the ECU. The ECU includes a rectifier circuit for converting the AC voltage of the main AC power supply and the alternating current EMF created in one or more additional windings into respective DC power. The resulting DC power is obtained by adding the respective DC powers.

The obtained DC power is then converted to obtained AC output power by an inverter circuit within the ECU. The ECU includes a variable frequency drive (VFD) control module configured to vary the voltage and frequency of the resulting AC output power.

The ECU also includes a frequency synchronization circuit configured to synchronize the frequency of the obtained AC output power with the frequency of the main AC power source. At this stage, the ECU may disconnect the direct main AC power to the stator via the disconnect switch, and the stator is continuously supplied with only the AC output power obtained by the ECU.

According to one embodiment, the ECU includes a microprocessor configured to calculate a phase difference in voltage and current by measuring a time difference between a voltage peak and a current peak when a load is applied to the induction motor. .

The ECU includes a capacitor bank with a plurality of capacitors, each capacitor of the plurality of capacitors having its own capacitance value. The capacitor bank balances the induction motor load and stabilizes the power input to the induction motor and the power factor (PF) of the main power line. The capacitor bank includes a plurality of capacitors that vary in capacitance based on the amount of load to which the induction motor is exposed. The amount of load is reflected in the sense of amperage measured by the current transformer (CT) coil in the ECU.

The ECU further includes a TRIAC to enable a switching (ON/OFF) function to select one of the plurality of capacitors from the capacitor bank to provide power to the induction motor based on the induction motor's load requirements. including. The ECU adds the required value of capacitance from the capacitor bank by switching on the TRIAC within the ECU. As the load increases, the value of capacitance increases. When the load changes, the ECU changes the capacitance value in the capacitor bank by switching the TRIAC.

According to one embodiment, the switching function of the TRIAC is controlled by a control device. The control device is either located within the ECU or external to the ECU. Control devices include, but are not limited to, microcontrollers, digital signal processors (DSPs), microprocessors, or network operating computing devices.

FIG. 1 is a schematic diagram illustrating various components and operation of an energy efficient induction motor according to an exemplary embodiment of the invention. Referring to FIG. 1, a stator 102 and a rotor 104, a main AC power source 106, a main winding (M) of stator 102, one or more additional windings (A) of stator 102, and a main winding a rotating magnetic field (RMF) 108 produced in (M), an alternating current EMF 110 produced in one or more additional windings (A), an electronic control unit (ECU) 112, and a control device 114; Induction motor 100 is shown with its resulting AC output power 116 and load 118 .

Stator 102 includes a main winding (M) and one or more additional windings (A). The terminal ends of each of the main winding (M) and the additional winding (A) are connected to ECU 112.

The main winding (M) of the stator 102 produces RMF 108 when a main AC power source 106 is connected to the main winding (M) to provide power input.

The rotor 104 is arranged to rotate relative to the main winding (M) of the stator 102 due to the RMF 108 created within the main winding (M). One or more additional windings (A) of stator 102 create an alternating current EMF 110 that is induced in the one or more additional windings (A) by rotation of rotor 104 . The main winding (M) and one or more additional windings (A) may include single-core wires or multi-core wires.

The alternating current EMF 110 created in one or more additional windings (A) is then collected and manipulated into the main windings of the stator 102 through a complete rotational cycle of the rotor 104 through an ECU 112 coupled to the stator 102. (M) is fed back simultaneously. The energy thus created during rotation of the rotor 104 (alternating current EMF 110) satisfies a major part of the energy requirements of the induction motor 100 when the induction motor 100 partially functions as a generator.

Configuration and operational details related to stator (102) and rotor (104) are further described in conjunction with FIGS. 2, 3, 4, 5, 6, and 7.

The alternating current EMF 110 created in one or more additional windings (A) of the stator 102 is supplied to the ECU 112. ECU 112 converts the AC voltage of main AC power supply 106 and the AC EMF 110 created in one or more additional windings (A) into respective DC power. The resulting DC power is obtained by adding the respective DC powers.

The resulting DC power is then converted to AC output power 116 by circuitry within the ECU 112 . ECU 112 then provides the resulting AC output power 116 to the main winding (M) of stator 102. Therefore, stator 102 is continuously supplied with only the resulting AC output power 116.

Control device 114 is critical to the functioning of ECU 112. Control device 114 provides the required torque, frequency, and power (alternating current EMF 110) generated by rotor 104 while rotating to provide the necessary torque, frequency, and power (alternating current EMF 110) to rotate rotor 104 and drive load 118. Controls the supplied power/energy (RMF 108). Control device 114 is either located within ECU 112 or external to ECU 112. Control device 114 may include, but is not limited to, a microcontroller, a digital signal processor (DSP), a microprocessor, or a network operating computing device external to ECU 112.

Main AC power supply 106 provides power to ECU 112 and then provides the necessary power or torque to induction motor 100 to perform its functions and drive load 118 . The energy required to develop torque is collected by the AC EMF 110 generated in the main power line of the main AC power source 106 and in one or more additional windings (A) of the stator 102 by rotation of the rotor 104. provided.

Various embodiments of ECU 112 are further described in conjunction with FIGS. 8 and 9. ECU 112 may include a number of functional parts and components, as described in further detail below. Alternatively, or in addition, multiple ECUs may be utilized with induction motor 100.

FIG. 2 is a diagram of a stator of an energy efficient induction motor, according to an exemplary embodiment of the invention. Referring to FIG. 2, stator 102 is shown including frame or yoke 202, stator core 204, stator slots 206, and stator windings 208.

The frame or yoke 202 is made of fine-grained alloy cast iron or aluminum alloy and forms an integral part of the stator 102. The primary function of the frame or yoke 202 is to provide a protective cover for other sophisticated components or parts of the induction motor 100.

Stator core 204 is made from laminations that include stator slots 206 punched from sheets of electrical grade steel. The space provided within stator slot 206 is sufficient to accommodate stator windings 208, including one or more sets of winding wires. In a related aspect, the space provided within stator slot 206 may be larger than conventional slots. The winding wire is an insulated wire such as that used in conventional motors. The size of stator slots 206 may be adjusted and maintained for uniform distribution of stator windings 208.

The space provided within the stator slot 206 is provided with a main winding (M) that carries the supply power/energy (RMF 108) required to rotate the rotor 104, and one or one or more sets of windings comprising one or more additional windings (A) used for the transfer of electrical power (AC EMF 110) induced in the plurality of additional windings (A); The wire is configured to house the line wire. The energy created during rotation of rotor 104 (alternating current EMF 110) satisfies a portion of the energy requirements of induction motor 100 when it functions in part as a generator.

Additionally, stator 102 includes carefully machined cuts and holes to ensure void uniformity. The shaft and bearings used within stator 102 of induction motor 100 are like any other conventional induction motor. Appropriately sized ball bearings are used to reduce rotational friction and support radial and axial loads. A fan is provided to allow adequate circulation of air to cool the stator windings 208. The heat generated within the induction motor 100 is transferred to the stator winding 208, i.e. the main winding (M) corresponding to the supplied power/energy (RMF 108) required to rotate the rotor 104, due to lower current consumption. , and one or more windings (A) to each other corresponding to the transfer of electrical power (AC EMF 110) generated in the one or more additional windings (A) while rotor 104 is rotating. Relatively little due to opposing movements. Therefore, the size of the cooling fan can be reduced, thus saving some energy in that regard. The bearing is housed in the end of the shaft and fixed to the frame or yoke 202.

The number of poles and number of windings required for the stator 102 is such that the synchronous speed is directly proportional to the frequency and inversely proportional to the number of poles according to the equation Ns=120f/P, where "Ns" The synchronous speed is determined based on the speed of the induction motor 100 since "f" is the frequency and "P" is the number of poles.

According to an exemplary embodiment of the invention, stator 102 includes a total of 24 slots as required for six poles, each pole having four slots as shown in FIG. Each slot has one set of two winding wires, a main winding (M) corresponding to the supplied power/energy (RMF 108) required to rotate the rotor 104, and a One or more additional windings (A) are provided corresponding to the transfer of electrical power (AC EMF 110) generated in the one or more additional windings (A). The terminal ends of each of these windings are connected to ECU 112.

FIG. 3 is a diagram of a rotor of an energy efficient induction motor, according to an exemplary embodiment of the invention. Referring to FIG. 3, rotor 104 is shown with steel laminations 302, aluminum bars 304, rotor shaft 306, and end rings 308.

In this particular embodiment, rotor 104 is a squirrel cage type rotor. The rotor 104 includes a cylinder of steel laminations 302 with aluminum bars 304 for separating the steel laminations 302 of the rotor 104 . In some embodiments, the rotor 104 is parallel or nearly parallel to the rotor shaft 306 and has a highly conductive metal (typically aluminum or copper) embedded near and within the surface of the rotor 104. May include. At each end of the rotor 104, the rotor conductors are shorted by continuous end rings 308 of similar material as the rotor conductors. The rotor conductor and its end ring 308 by itself form a complete closed circuit.

When an alternating current flows through stator windings 208, RMF 108 is created. This induces a current within the rotor windings, creating its own magnetic field. The interaction of the magnetic fields created by the stator and rotor windings creates torque on the rotor 104.

RMF 108 induces a voltage in the rotor bar that causes a short circuit current to begin flowing into the rotor bar. These rotor currents generate their own magnetic fields that interact with the RMF 108 of the stator 102. The rotor field attempts to oppose its object, which is RMF 108. Therefore, rotor 104 begins to keep up with RMF 108. As rotor 104 follows RMF 108, the rotor current drops to zero since there is no more relative motion between RMF 108 and rotor 104. Therefore, when rotor 104 experiences zero tangential force, rotor 104 decelerates relative to the moment. After deceleration of rotor 104, relative motion between rotor 104 and RMF 108 is reestablished, and thus rotor current is induced again. Therefore, the tangential force for rotation of rotor 104 is restored again and rotor 104 starts rotating again after RMF 108. In this way, rotor 104 maintains a constant speed that is lower than the speed of RMF 108 or the synchronous speed (Ns).

FIG. 4 is a diagram of a stator winding of an energy efficient induction motor showing terminals, according to an exemplary embodiment of the invention. Referring to FIG. 4, the phase I motor winding terminals (supply power input) of the first set of windings (M1, M2), the phase II motor windings of the second set of windings (MM1, MM2) Motor winding terminals (supply power input) of phase III of the third set of windings (MMM1, MMM2), phase I of the first set of windings (A1, A2) motor winding terminals (AC EMF output), phase II motor winding terminals (AC EMF output) of the second set of windings (AA1, AA2), and of the third set of windings (AAA1, AAA2). Stator windings 208 are shown including phase III motor winding terminals (AC EMF output).

M1 and M2, MM1 and MM2, and MMM1 and MMM2 refer to the two ends of each winding coil of stator 102 corresponding to the supplied power/energy (RMF 108) required to rotate rotor 104. To tell. A1 and A2, AA1 and AA2, and AAA1 and AAA2 are the AC EMF 110, which is the power generated in one or more additional windings (A) of the stator 102 while the rotor 104 is rotating. The two ends of each winding coil of stator 102 in the same set correspond to the transmission of .

The internal winding connections of induction motor 100 are as follows according to an exemplary embodiment of the invention.

M1, MM1 and MMM1, each carrying a main AC power supply 106, are connected to ECU 112. M2, MM2 and MMM2 are coupled together to form a star connection, as shown in FIG.

A1, AA1 and AAA1, each carrying an AC EMF 110, are connected to the ECU 112. A2, AA2 and AAA2 are coupled together to form a star connection, as shown in FIG.

FIG. 5 is a diagram of power generated within a set of stator windings, according to an exemplary embodiment of the invention. Referring to FIG. 5, a diagram of a sine wave is shown, where M _s represents a sine wave corresponding to the supplied power/energy (RMF 108) carried by the main winding (M) of the stator 102 to rotate the rotor 104. , A _s indicates a sine wave corresponding to the alternating current EMF 110 generated in one or more additional windings (A) of the stator 102 due to rotation of the rotor 104 .

FIG. 6 is a diagram illustrating flux distribution within a set of stator windings, according to an exemplary embodiment of the invention. Referring to FIG. 6, the rotating magnetic flux M1 created in the main winding (M) of the stator 102 and the alternating flux A1 created in one or more additional windings (A) of the stator 102 are It is shown.

A rotating magnetic flux M1 is created within the main winding (M) of the stator 102 to create torque for driving the rotor shaft 306 of the induction motor 100. The alternating current flux A1 creates/generates an alternating current EMF 110 in one or more additional windings (A) of the stator 102. The rotating flux M1 and the alternating flux A1 are in phase and in mutually opposite directions. These fluxes are distributed 120° apart.

FIG. 7 is a diagram illustrating power line distribution for an energy efficient induction motor, according to an exemplary embodiment of the invention. Referring to FIG. 7, main AC power supply 106 is shown as a power input, ECU 112 and AC EMF 110 as generated power output.

As shown in FIG. 7, it is assumed that one revolution is divided into two equal segments/sectors representing a complete revolution of the induction motor 100. While the rotor 104 begins to rotate, it draws power from the main AC power source 106 (input power) and simultaneously generates/produces an AC EMF 110 as a power output.

FIG. 8A is a schematic diagram of an ECU for collecting power/energy produced in additional windings of a stator of an energy efficient induction motor, according to an exemplary embodiment of the invention. Referring to FIG. 8A, an ECU 112 is shown that includes a rectifier circuit 802, an inverter circuit 804, a variable frequency drive (VFD) control module 806, a frequency synchronization circuit 808, a disconnect switch 810, and a microprocessor 812.

Rectification circuit 802 includes one or more rectifiers to convert the AC voltage of main AC power supply 106 and the AC EMF 110 created in the additional windings (A) of stator 102 to respective DC power. The resulting DC power 814 is obtained by adding the respective DC power that is then supplied to the inverter circuit 804.

Inverter circuit 804 includes one or more inverters to convert obtained DC power 814 to obtained AC output power 116.

VFD control module 806 is configured to vary the voltage and frequency of the resulting AC output power 116.

Frequency synchronization circuit 808 is configured to synchronize the frequency of main AC power source 106 and the frequency of obtained AC output power 116. The resulting AC output power 116 is then supplied from the ECU 112 to the main winding (M) of the stator 102.

At this stage, the disconnect switch 810 is configured to disconnect the main AC power supply 106 to the main winding (M) of the stator 102, after which the main winding (M) of the stator 102 is disconnected from the resulting AC output. Only power 116 is continuously supplied.

The microprocessor 812 is configured to calculate the voltage and current phase difference by measuring the time difference between the voltage peak and the current peak when the induction motor 100 is loaded.

FIG. 8B is a simplified schematic diagram of an ECU for collecting power/energy generated within multiple windings of a stator of an energy efficient induction motor, according to an exemplary embodiment of the invention. Referring to FIG. 8B, ECU 112 is shown including drive circuit 816, frequency control circuit 818, and switch 820.

The drive circuit 816 includes rectifiers 1-n for converting the AC voltage of the main AC power supply 106 and the AC EMF 110 created in the multiple additional windings (A) 1-n of the stator 102 into respective DC power. . The AC EMF 110 created within each additional winding of the number of additional windings (A) is provided to a corresponding rectifier of the drive circuit 816 for conversion to a respective DC power. For example, rectifier 1 converts the AC EMF 110 created in additional winding 1 into respective DC power, and rectifier 2 converts AC EMF 110 created in additional winding 2 into respective DC power. The rectifier n converts the AC EMF 110 created in the additional winding n into respective DC power, and so on.

The resulting DC power 814 is obtained by adding the respective DC powers that are subsequently supplied to a frequency control circuit 818 to produce the resulting AC output power 116.

Frequency control circuit 818 is configured to synchronize the frequency of AC output power 116 obtained with the frequency of main AC power supply 106 . The resulting AC output power 116 is then supplied from the ECU 112 to the main winding (M) of the stator 102. At this stage, the switch 820 is configured to disconnect the main AC power 106 to the main winding (M) of the stator 102, after which the main winding (M) of the stator 102 is connected to the resulting AC output power 116. only is supplied continuously.

FIG. 9 is a schematic diagram of an ECU for controlling supplied power/energy to create torque to drive an energy efficient induction motor load, according to an exemplary embodiment of the invention. Referring to FIG. 9, a microcontroller 902, a step-down transformer 904, a current transformer (CT) coil 906, a capacitor bank (C3, C4, C5) 908, a TRIAC (TR1, TR2, TR3, TR4, TR5, TR6) ECU 112 is shown including 910, digital to analog converter 912, and display 914.

Microcontroller 902 is critical to the functionality of ECU 112. Microcontroller 902 supplies power necessary to rotate rotor 104 and control the torque, frequency, and power (AC EMF 110) produced by rotor 104 while rotating to drive load 118. /Energy (RMF110) is controlled. A bridge rectifier (not shown) is used to convert the AC supply voltage to the microcontroller 902 to a DC voltage for operation of the microcontroller 902.

Step-down transformer 904 provides power dedicated to the operation of ECU 112. The main power line (phase) of the main AC power supply 106 to the induction motor 100 is connected to the step-down transformer 904 of the ECU 112 and the stator windings 208, and the neutral line of the main AC power supply 106 is connected to the ECU 112 and the induction motor Connected to 100 terminal boxes.

The power sensing converter's CT coil 906 measures the input current and stabilizes the current. The output of CT coil 906 is connected to microcontroller 902. The input of the current sensing transformer is connected to the line/input voltage to sense current, and the output of the current sensing converter is connected to the microcontroller 902.

Capacitor bank 908 includes a plurality of capacitors (C3, C4, C5), each capacitor of the plurality of capacitors (C3, C4, C5) having its own capacitance value. Capacitor bank 908 is used to balance the load 118 of induction motor 100 and stabilize the power input to induction motor 100 and the power factor (PF) of the main power line.

TRIAC 910 selects one of the plurality of capacitors (C3, C4, C5) from capacitor bank 908 such that the switching (ON/OFF) function provides power to induction motor 100 based on the load requirements of induction motor 100. make it possible to The switching function of the TRIAC is controlled by control device 114, in this case microcontroller 902. While the induction motor 100 is running at different loads, the TRIAC 910 selects the required capacity from the capacitor bank 908 based on the load requirements. Switching of the TRIAC 910 controls the load 118 and input current to the induction motor 100.

While rotor 104 begins to rotate, rotor 104 draws power from main AC power source 106 and simultaneously induces an AC EMF 110 in one or more additional windings (A) of stator 102 . Current consumption is measured by CT coil 906 and this current is provided to ECU 112. The current is then passed over a microcontroller 902 programmed to activate the TRIAC 910 based on the load 118 and then a capacitor bank 908 with different ratings provided therein to match the torque requirements. TRIAC 910 is activated to select and connect a particular capacitor from the plurality of capacitors (C3, C4, C5) within the TRIAC 910. For example, for a 1 HP motor, the selected capacitance value is 15 to 20 μf.

Digital to analog converter 912 is an integrated circuit (IC) within which the output of microcontroller 902 is connected. Digital to analog converter 912 converts the digital output signal of microcontroller 902 to an analog signal that is then provided to TRIAC 910. TRIAC 910 therefore controls load 118 of induction motor 100.

According to an exemplary scenario, the TRIAC 910 is configured from a capacitor bank 908 having capacitors that vary their capacitance based on the amount of load 118 to which the induction motor 100 is exposed, as reflected in the amperage sense measured by the CT coil 906. , a capacitor, for example C3.

According to the scenario, when the induction motor 100 is powered on, a connection is made to the capacitor C3 by means of switching TRIAC1 provided in the ECU 112 and the induction motor 100 starts rotating, An alternating current EMF 110 is generated simultaneously in one or more additional windings (A). When load 118 increases, TRIAC2 turns on capacitor C4. If the load increases further, TRIAC3 activates capacitor C5 and so on. In this way, the load 118 on the induction motor 100 is balanced.

A display 914 located within the ECU 112 shows the voltage, current, frequency and power consumption of the induction motor 100 at different loads.

In various other embodiments, ECU 112 also includes overload protection, short circuit protection, and overtemperature tripping arrangements.

The present invention is advantageous in that it provides an energy efficient induction motor that has wide industrial applicability due to its reliability in performance compared to other conventional AC motors. Energy-efficient induction motors reduce the consumption of electricity to a large extent and provide financial benefits in the agricultural sector, locomotive sector, and other industries that use induction motors extensively.

The energy-efficient induction motor of the present invention consumes less current by implementing a specially designed electronic module coupled to a bespoke stator winding design to ensure higher current efficiency.

The present invention is capable of producing an apparent EMF (alternating current EMF) while the motor is rotating, such that part of the power requirement for driving the motor is met while the motor is running. The implementation of the windings in the stator provides an energy efficient induction motor that consumes less current compared to conventional motors of the same capacity. The disclosed invention also allows single phase induction motors to be used instead of three phase induction motors without compromising on input power requirements.

Additionally, single-phase induction motors constructed using the disclosed invention have lower electrical, magnetic, and thermal losses compared to three-phase induction motors for the same power requirements. Also, magnetic and thermal losses are less compared to a three-phase induction motor with the same output power requirement.

Those skilled in the art will appreciate that the above-identified advantages and other advantages described herein are merely exemplary and are meant to be a complete representation of all of the advantages of various embodiments of the present invention. You can see that it is not.

The invention may be implemented in hardware or a combination of hardware and software. The invention may be implemented centrally or distributed within at least one computer system, or the different elements may be spread across several interconnected computer systems. A computer system or other apparatus/device adapted to perform the methods described herein may be adapted. The combination of hardware and software is a general-purpose computer system comprising a computer program that, when loaded and executed on the computer system, may control the computer system to perform the methods described herein. Good too. The invention may be implemented in hardware with portions of integrated circuits that also perform other functions. The invention may also be implemented as firmware forming part of a media rendering device.

The invention also includes all features that enable the implementation of the methods described herein, and may be configured to perform these methods when loaded and/or executed on a computer system. It may be embedded in a good computer program product. A computer program is defined herein as any language, code or representation of a set of instructions intended to cause a system equipped with information processing capabilities to perform a specific function directly, or a) into another language, code or representation. b) reproduction in the form of a different material, or any expression subsequent to either or both of the following:

Although the invention has been described with reference to particular embodiments, those skilled in the art will appreciate that various modifications may be made and equivalents may be substituted without departing from the scope of the invention. You will understand. In addition, many modifications may be made to adapt a particular situation or material to the teachings of the invention without departing from its scope. Therefore, it is intended that the invention not be limited to the particular embodiments disclosed, but that the invention will include all embodiments falling within the scope of the appended claims.

100 induction motor 102 stator 104 rotor 106 main AC power supply 108 rotating magnetic field 110 AC EMF
112 Electronic control unit 114 Control device 116 AC output power 118 Load 202 Frame or yoke 204 Stator core 206 Stator slot 208 Stator winding 302 Steel lamination 304 Aluminum bar 306 Rotor shaft 308 End ring 802 Rectifier circuit 804 Inverter circuit 806 Variable frequency drive control Module 808 Frequency synchronization circuit 810 Disconnect switch 812 Microprocessor 816 Drive circuit 818 Frequency control circuit 820 Switch 902 Microcontroller 904 Step-down transformer 906 Current transformer (CT) coil 908 Capacitor bank 910 TRIAC
912 Digital analog converter 914 Display

Claims (16)

a stator (102) comprising a main winding (M) for generating a rotating magnetic field (RMF) (108) when the main winding (M) of the stator (102) is provided with a main AC power source (106);
an induction motor (100) comprising a rotor (104) arranged to rotate with respect to the main winding (M) of the stator (102) by the RMF (108),
The stator (102) further includes one or more additional windings (A), and rotation of the rotor (104) causes the one or more additional windings (A) of the stator (102) to an electronic control unit (ECU) for inducing an alternating current EMF (110) in said stator (102), said alternating current EMF (110) created in said one or more additional windings (A) being coupled to said stator (102); (112) to the main winding (M) of the stator (102) throughout a complete rotation cycle of the rotor (104);
The ECU (112) is for converting the AC voltage of the main AC power supply (106) and the AC EMF (110) created in the one or more additional windings (A) into respective DC power. a rectifier circuit (802) in which the obtained DC power (814) is obtained by adding the respective DC powers;
an inverter circuit (804) for converting the obtained DC power (814) into obtained AC output power (116);
An induction motor (100) characterized in that said ECU (112) is configured to supply said obtained AC output power (116) to said main winding (M) of said stator (102). ). The stator (102) is made of a laminate with a plurality of stator slots (206), each stator slot of the plurality of stator slots (206) comprising one or more sets of wire windings, each set having a comprising a main winding (M) and one or more additional windings (A), said main winding (M) being supplied with the necessary power to rotate said rotor, said main winding (M) being supplied with the power necessary to rotate said rotor; 5. Additional windings (A) enable transmission of the alternating current EMF (110) created in the one or more additional windings (A) by rotation of the rotor (104). The induction motor (100) according to 1. The stator slots in the stator are sized to accommodate the one or more additional windings (A), and the size is configured to facilitate uniform distribution of the winding wires. An induction motor (100) according to claim 2, wherein the induction motor (100) comprises: The induction motor (100) according to claim 2, wherein each terminal end of the main winding (M) and the one or more additional windings (A) is connected to the ECU (112). . The induction motor (100) of claim 1, wherein the ECU (112) comprises a step-down transformer (904) that provides power for operation of the ECU (112). The main power line of the main AC power supply (106) to the induction motor (100) is connected to the step-down transformer (904) of the ECU (112) and the main winding (M) of the stator (102). The induction motor (100) of claim 5, wherein the neutral line of the main AC power source (106) is connected to the ECU (112) and a terminal box of the induction motor (100). 2. The ECU (112) comprises a variable frequency drive (VFD) control module (806) configured to vary the voltage and frequency of the obtained AC output power (116). Induction motor (100). The ECU (112) synchronizes the frequencies of the main AC power source (106) and the obtained AC output power (116), and provides the main winding (M) of the stator (102) with the obtained AC output power (116). The induction motor (100) of claim 1, comprising a frequency synchronization circuit (808) configured to provide AC output power (116). The ECU (112) is configured to disconnect the main AC power (106) to the main winding (M) of the stator (102) through a disconnect switch (810), Induction motor (100) according to claim 8, wherein the main winding (M) is continuously supplied with only the obtained AC output power (116). The ECU (112) was configured to calculate a phase difference between voltage and current by measuring a time difference between a voltage peak and a current peak when a load is applied to the induction motor (100). The induction motor (100) of claim 1, comprising a microprocessor (812). The ECU (112) further includes:
A capacitor bank (908) comprising a plurality of capacitors, each capacitor of the plurality of capacitors having its own capacitance value, for balancing the load (118) of the induction motor (100) and for balancing the load (118) of the induction motor (100). a capacitor bank (908) that stabilizes the power input to (100) and the power factor (PF) of the main power line;
an ON/OFF switching function selects one of the plurality of capacitors from the capacitor bank (908) to provide power to the induction motor (100) based on a load requirement of the induction motor (100); An induction motor (100) according to claim 1, comprising a TRIAC (910) for enabling. The induction motor (100) of claim 11, wherein the control device (114) is configured to control the ON/OFF switching function of the TRIAC (910). The control device (114) is located within the ECU (112) or external to the ECU (112), and the control device (114) includes a microcontroller (902), a digital signal processor (DSP) 13. The induction motor (100) of claim 12, wherein the induction motor (100) is at least one of a microprocessor, a microprocessor, or a network operation computing device. The ECU (112) includes a current transformer (CT) coil (906) for controlling and measuring the input current to the induction motor (100) and for stabilizing the input current, the CT coil (906) ) is connected to the control device (114). The capacitor bank (908) comprises a plurality of capacitors that vary in capacitance based on the amount of load (118) to which the induction motor (100) is exposed, the amount of load (118) being 15. Induction motor according to claim 14, reflected in the sense of amperage measured by . The ECU (112) is connected to the output of the control device (114) to convert the digital output signal of the control device (114) into an analog signal that is then provided to the TRIAC (910). The induction motor (100) of claim 12, comprising an analog converter (912).

Images