WO2013188940A2 - Electric drive method for linear motor - Google Patents

Electric drive method for linear motor Download PDF

Info

Publication number
WO2013188940A2
WO2013188940A2 PCT/BR2013/000216 BR2013000216W WO2013188940A2 WO 2013188940 A2 WO2013188940 A2 WO 2013188940A2 BR 2013000216 W BR2013000216 W BR 2013000216W WO 2013188940 A2 WO2013188940 A2 WO 2013188940A2
Authority
WO
WIPO (PCT)
Prior art keywords
linear motor
electric
electric drive
sinusoidal
drive method
Prior art date
Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
Ceased
Application number
PCT/BR2013/000216
Other languages
French (fr)
Other versions
WO2013188940A3 (en
Inventor
Douglas Pereira da SILVA
Current Assignee (The listed assignees may be inaccurate. Google has not performed a legal analysis and makes no representation or warranty as to the accuracy of the list.)
Whirlpool SA
Original Assignee
Whirlpool SA
Priority date (The priority date is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the date listed.)
Filing date
Publication date
Application filed by Whirlpool SA filed Critical Whirlpool SA
Publication of WO2013188940A2 publication Critical patent/WO2013188940A2/en
Publication of WO2013188940A3 publication Critical patent/WO2013188940A3/en
Anticipated expiration legal-status Critical
Ceased legal-status Critical Current

Links

Classifications

    • H—ELECTRICITY
    • H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
    • H02P—CONTROL OR REGULATION OF ELECTRIC MOTORS, ELECTRIC GENERATORS OR DYNAMO-ELECTRIC CONVERTERS; CONTROLLING TRANSFORMERS, REACTORS OR CHOKE COILS
    • H02P27/00—Arrangements or methods for the control of AC motors characterised by the kind of supply voltage
    • H02P27/04—Arrangements or methods for the control of AC motors characterised by the kind of supply voltage using variable-frequency supply voltage, e.g. inverter or converter supply voltage
    • H02P27/06—Arrangements or methods for the control of AC motors characterised by the kind of supply voltage using variable-frequency supply voltage, e.g. inverter or converter supply voltage using DC to AC converters or inverters
    • H02P27/08—Arrangements or methods for the control of AC motors characterised by the kind of supply voltage using variable-frequency supply voltage, e.g. inverter or converter supply voltage using DC to AC converters or inverters with pulse width modulation
    • H02P27/14—Arrangements or methods for the control of AC motors characterised by the kind of supply voltage using variable-frequency supply voltage, e.g. inverter or converter supply voltage using DC to AC converters or inverters with pulse width modulation with three or more levels of voltage
    • H—ELECTRICITY
    • H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
    • H02P—CONTROL OR REGULATION OF ELECTRIC MOTORS, ELECTRIC GENERATORS OR DYNAMO-ELECTRIC CONVERTERS; CONTROLLING TRANSFORMERS, REACTORS OR CHOKE COILS
    • H02P25/00—Arrangements or methods for the control of AC motors characterised by the kind of AC motor or by structural details
    • H02P25/02—Arrangements or methods for the control of AC motors characterised by the kind of AC motor or by structural details characterised by the kind of motor
    • H02P25/06—Linear motors
    • H02P25/062—Linear motors of the induction type
    • H—ELECTRICITY
    • H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
    • H02P—CONTROL OR REGULATION OF ELECTRIC MOTORS, ELECTRIC GENERATORS OR DYNAMO-ELECTRIC CONVERTERS; CONTROLLING TRANSFORMERS, REACTORS OR CHOKE COILS
    • H02P25/00—Arrangements or methods for the control of AC motors characterised by the kind of AC motor or by structural details
    • H02P25/02—Arrangements or methods for the control of AC motors characterised by the kind of AC motor or by structural details characterised by the kind of motor
    • H02P25/06—Linear motors
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F25—REFRIGERATION OR COOLING; COMBINED HEATING AND REFRIGERATION SYSTEMS; HEAT PUMP SYSTEMS; MANUFACTURE OR STORAGE OF ICE; LIQUEFACTION SOLIDIFICATION OF GASES
    • F25B—REFRIGERATION MACHINES, PLANTS OR SYSTEMS; COMBINED HEATING AND REFRIGERATION SYSTEMS; HEAT PUMP SYSTEMS
    • F25B2400/00—Component parts or details not otherwise provided for in this subclass
    • F25B2400/07—Details of compressors or related parts
    • F25B2400/073—Linear compressors
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F25—REFRIGERATION OR COOLING; COMBINED HEATING AND REFRIGERATION SYSTEMS; HEAT PUMP SYSTEMS; MANUFACTURE OR STORAGE OF ICE; LIQUEFACTION SOLIDIFICATION OF GASES
    • F25B—REFRIGERATION MACHINES, PLANTS OR SYSTEMS; COMBINED HEATING AND REFRIGERATION SYSTEMS; HEAT PUMP SYSTEMS
    • F25B49/00—Arrangement or mounting of control or safety devices
    • F25B49/02—Arrangement or mounting of control or safety devices for compression type machines, plants or systems
    • F25B49/025—Motor control arrangements

Definitions

  • the present invention refers to a new electric drive method for linear motor, and, more specifically, to an electric drive method essentially based on the sinusoidal pulse width modulation (PMW) technique capable of improving the efficiency of electromechanical energy conversion in a resonant motor drive motor contained in linear compressors.
  • PMW sinusoidal pulse width modulation
  • the present state of the art is comprised of different types of fluid compressors and, more particularly, different types of compressors where fluid is used in refrigeration systems.
  • compressors which essentially comprise a (preferably electric) rotary motor and a compression mechanism basically including at least a cylinder-piston assembly.
  • piston is commonly associated with a motor rotor (generally through an eccentric edge of the rotor shaft and a piston rod) such that rotational movement of the motor rotor is converted into alternate linear movement of the piston.
  • said piston that is linear and alternately shifted within the cylinder can compress the fluids previously introduced into said cylinder.
  • one of the control features of a rotary compressor refers to the rotary motor drive.
  • One of the commonly used drive methods for rotary motors comprises a power control method based on pulse width modulation of the electric (current) voltage delivered to the motor stator coils.
  • said method (applied by means of transistorized or microprocessed systems) refers to speed (by altering feed voltage frequency) and power (by altering effective voltage) of rotary electric motors.
  • Movement in a resonant linear motor is theoretically purely sinusoidal.
  • a compressor suitable for refrigeration systems there is a small wave form deformation describing a movement caused by compressive strength, this being more intense near the upper dead point.
  • the motor power factor must be unitary, that is, a current in phase with the back electromotive force is free of harmonics when assuming that this back electromotive force is almost purely sinusoidal.
  • motors like this are driven by square-wave single-pulse inverters.
  • the most common strategy is to drive a motor with a current in phase with back electromotive from the reading thereof when said current therein extinguishes.
  • the ability to directly make the reading of the back electromotive force is one of the advantages of this method; however, it limits the power on the motor shaft and generates a high content of harmonics either in the applied voltage or in the circulating current, mainly when running in medium or low loads.
  • Such content of harmonics causes the currents to be higher than the one that generates work to circulate, thus producing losses in copper.
  • Said content of harmonics further induces components of higher frequency in the magnetic circuit to generate losses by hysteresis and Foucault current and undesired vibrations.
  • one object of the present invention is to provide an electric drive system for linear motor especially based on sinusoidal pulse width modulation technique.
  • another object of the present invention is to provide said drive system comprising a system capable of improving the efficiency of electromechanical conversion of the linear motor by reducing the content of harmonics of the current injected into the motor.
  • Yet another object of the invention is to provide an electric drive method for linear motor essentially based on the sinusoidal pulse width modulation. Therefore, a further object of the preset invention is that all advantages provided by the sinusoidal pulse width modulation technique (when applied to rotary motors) are delivered to linear compressors.
  • electric voltage of the electric signal comprises at least a wave segment of quadratic spectrum and the electric current of the electric signal comprises at least an essentially sinusoidal spectrum wave segment.
  • Said sinusoidal pulse width modulation technique cooperates with the linear motor resonance frequency.
  • said sinusoidal pulse width modulation technique provides three (positive, neutral, and negative) levels.
  • said sinusoidal pulse width modulation technique can further provide only two (positive and negative) modulation levels.
  • the electric signal generation is achieved by transistorized systems, or also by microcontrolled systems.
  • Fig. 1 illustrates an electric model of resonant linear model
  • Fig. 2 illustrates a block diagram of the electric drive system for linear motor in accordance with the present invention
  • Fig. 3 illustrates the wave shapes of output voltage and output current supplied by the electric drive system for linear motor in accordance with the present invention.
  • Fig. 4 illustrates a comparative experimental result between a linear compressor whose drive is based on methods pertaining to the state of the art, and a linear compressor whose drive is based on the electric drive method for linear motor in accordance with the present invention.
  • Fig. 1 illustrates a conceptual electric model of a linear motor 1 .
  • said linear motor 1 can be interpreted as comprising an inductive composition 1 1 , a resistive composition 12 and a back electromotive force 13, both arranged in series.
  • said linear motor 1 is ideally fed by a sinusoidal voltage source 2, whose electric voltage frequency is similar and analogous to the frequency of the generated electric current.
  • an electric drive method for linear motor is herein disclosed, which objective is to associate the drive of a linear motor for a linear compressor with the sinusoidal pulse width modulation technique so as to supply sinusoidal operational current having substantially low content of harmonics to said linear motor.
  • the presently claimed method is preferably carried out by a system as schematically shown in Fig. 2.
  • Said system comprises a transistorized system conventionally known by those skilled in the art, in full bridge, formed by transistors 21 , controllers 22 and the remaining auxiliary circuits which make part of the interface between the signal-generating logic level circuit and said transistors.
  • Such step is responsible for modulating the current supplied to the linear motor in accordance with the desired wave shape. As already known by those skilled in the art, this is, therefore, achieved by commanding the transistors 21 through controllers 22, with pulsing signals counting with pulses varying in their duration in accordance with a sinusoidal signal.
  • Output signal of this system type provides wave shapes of voltage 31 and current 32 capable of being applied to a linear motor.
  • Wave shape of voltage 31 is modulated at high frequency but with a component value at the relevant fundamental frequency.
  • Wave shape of current 32 is, nevertheless, almost purely sinusoidal, only having a small wave at high frequency resulting from the filtering effected by a motor inductive component. And said motor is highly benefited since the injected current that generates flow can be converted to work given that the system controls the current phase to be in alignment with the speed of motor 1 or with the back electromotive force 13.
  • wave shape of voltage 31 is modulated at high frequency but with component value at the relevant fundamental frequency.
  • Wave shape of current 32 is, nevertheless, purely sinusoidal, possessing only a small wave at high frequency as a result of the filtering effected by a motor inductive component.
  • said motor is significantly benefited since it is the injected current that generates flow and as such it has substantially low content of harmonics, wherein almost all this flow can be converted to work given that the system controls the phase of said current to be in alignment with the speed of motor 1 or the back electromotive force 13.
  • the obtained current 32 is proportionally low but without losing sinusoidal shape which is a particularity thereof. Therefore, in this range a significant gain that can be obtained by using the method of the present invention is more evident.
  • Fig 4 shows a comparative experimental result referring to gain in effectiveness of one same linear motor 1 , wherein curve 41 referring to the linear motor 1 driven by the presently disclosed electric drive method (sinusoidal PWM modulation) and curve 42 referring to said linear motor 1 driven by conventional methods pertaining to the present state of the art.
  • the gain of curve 41 is especially interesting in an operation range of important interest for refrigeration applications.
  • Another important result accomplished by the electric drive method of the present invention refers to an improvement in the capacity of said linear motor 1 , since holding the motor at zero current is not required.
  • the electric drive method of the present invention is especially interesting when used in conjunction with a control of linear motor stroke described in BR Patent Application PI1 103776-8 assigned to the same assignee of the present invention.
  • the electric drive method for linear motor essentially based on sinusoidal pulse width modulation technique permits to optimize the control system of the linear motor drive stroke.

Landscapes

  • Engineering & Computer Science (AREA)
  • Power Engineering (AREA)
  • Control Of Linear Motors (AREA)
  • Control Of Ac Motors In General (AREA)
  • Compressors, Vaccum Pumps And Other Relevant Systems (AREA)
  • Control Of Motors That Do Not Use Commutators (AREA)

Description

ELECTRIC DRIVE METHOD FOR LINEAR MOTOR
Field of the Invention
The present invention refers to a new electric drive method for linear motor, and, more specifically, to an electric drive method essentially based on the sinusoidal pulse width modulation (PMW) technique capable of improving the efficiency of electromechanical energy conversion in a resonant motor drive motor contained in linear compressors.
Background of the Invention
As known by those skilled in the art, the present state of the art is comprised of different types of fluid compressors and, more particularly, different types of compressors where fluid is used in refrigeration systems.
Among these different types, there can be cited alternative compressors, which essentially comprise a (preferably electric) rotary motor and a compression mechanism basically including at least a cylinder-piston assembly.
In this context, it is also known that piston is commonly associated with a motor rotor (generally through an eccentric edge of the rotor shaft and a piston rod) such that rotational movement of the motor rotor is converted into alternate linear movement of the piston. By this way, said piston that is linear and alternately shifted within the cylinder can compress the fluids previously introduced into said cylinder.
Therefore, one of the control features of a rotary compressor refers to the rotary motor drive.
In this context, and in accordance with specialized technical literature, it is observed that the present state of the art also comprises a plurality of electric drive systems and methods for rotary motors.
One of the commonly used drive methods for rotary motors comprises a power control method based on pulse width modulation of the electric (current) voltage delivered to the motor stator coils. Generally speaking, said method (applied by means of transistorized or microprocessed systems) refers to speed (by altering feed voltage frequency) and power (by altering effective voltage) of rotary electric motors.
Movement in a resonant linear motor is theoretically purely sinusoidal. In a compressor suitable for refrigeration systems, however, there is a small wave form deformation describing a movement caused by compressive strength, this being more intense near the upper dead point.
Due to the sinusoidal characteristic of the movement, back electromotive force generated and induced by magnet movement is also a sinusoidal characteristic. A simplified model for electric analysis is shown in Fig. 1 .
Therefore, for efficiency maximization the motor power factor must be unitary, that is, a current in phase with the back electromotive force is free of harmonics when assuming that this back electromotive force is almost purely sinusoidal.
As known by those skilled in the art, motors like this are driven by square-wave single-pulse inverters. The most common strategy is to drive a motor with a current in phase with back electromotive from the reading thereof when said current therein extinguishes. The ability to directly make the reading of the back electromotive force is one of the advantages of this method; however, it limits the power on the motor shaft and generates a high content of harmonics either in the applied voltage or in the circulating current, mainly when running in medium or low loads. Such content of harmonics causes the currents to be higher than the one that generates work to circulate, thus producing losses in copper. Said content of harmonics further induces components of higher frequency in the magnetic circuit to generate losses by hysteresis and Foucault current and undesired vibrations.
In this regard, it is worthy to emphasize that the formerly mentioned drive of sinusoidal type is commonly used to drive (induction and BLDC motors) rotary motors which employ velocity/torque vector control. Sinusoidal drive is obtained by sinusoidal pulse width modulation.
Hence, it is then noted that there is a need in the state of the art for systems and methods capable of electrically driving resonant linear motors by sinusoidal pulse width modulation.
Objects of the Invention
Therefore, one object of the present invention is to provide an electric drive system for linear motor especially based on sinusoidal pulse width modulation technique. In this regard, another object of the present invention is to provide said drive system comprising a system capable of improving the efficiency of electromechanical conversion of the linear motor by reducing the content of harmonics of the current injected into the motor.
Yet another object of the invention is to provide an electric drive method for linear motor essentially based on the sinusoidal pulse width modulation. Therefore, a further object of the preset invention is that all advantages provided by the sinusoidal pulse width modulation technique (when applied to rotary motors) are delivered to linear compressors.
Summary of the Invention
All the objects of the present invention are achieved by the now disclosed electric drive method for linear motor, which comprises generating electric signal (for electric feed of linear motor essentially comprising a propeller and a shifter) based on the sinusoidal pulse width modulation technique.
In this context, it is noted that electric voltage of the electric signal comprises at least a wave segment of quadratic spectrum and the electric current of the electric signal comprises at least an essentially sinusoidal spectrum wave segment. Said sinusoidal pulse width modulation technique cooperates with the linear motor resonance frequency. Preferably, said sinusoidal pulse width modulation technique provides three (positive, neutral, and negative) levels. Optionally, said sinusoidal pulse width modulation technique can further provide only two (positive and negative) modulation levels.
Preferably, the electric signal generation is achieved by transistorized systems, or also by microcontrolled systems.
Brief Description of Drawings
The present invention is described in detail on the basis of the figures listed below, wherein:
Fig. 1 illustrates an electric model of resonant linear model;
Fig. 2 illustrates a block diagram of the electric drive system for linear motor in accordance with the present invention;
Fig. 3 illustrates the wave shapes of output voltage and output current supplied by the electric drive system for linear motor in accordance with the present invention; and
Fig. 4 illustrates a comparative experimental result between a linear compressor whose drive is based on methods pertaining to the state of the art, and a linear compressor whose drive is based on the electric drive method for linear motor in accordance with the present invention.
Detailed Description of the Invention
Fig. 1 illustrates a conceptual electric model of a linear motor 1 . According to this model, said linear motor 1 can be interpreted as comprising an inductive composition 1 1 , a resistive composition 12 and a back electromotive force 13, both arranged in series. In this regard, said linear motor 1 is ideally fed by a sinusoidal voltage source 2, whose electric voltage frequency is similar and analogous to the frequency of the generated electric current.
Based on this value of "fundamental frequency", in accordance with electric drive methods for linear motor pertaining to the present state of the art it is that the movement of the drive of the linear motor 1 is determined. Hence, said "fundamental frequency" of the sinusoidal voltage source 2 should be adjusted to work in accordance with the resonance frequency of linear motor 1 . Nevertheless, from said single pulse modulation, voltage and current are not sinusoidal but rather pulsing and, consequently, they are full of harmonics harmful to the effectiveness of the linear motor 1.
Therefore, and in accordance with concepts and objects mentioned above, an electric drive method for linear motor is herein disclosed, which objective is to associate the drive of a linear motor for a linear compressor with the sinusoidal pulse width modulation technique so as to supply sinusoidal operational current having substantially low content of harmonics to said linear motor.
To this effect, the presently claimed method is preferably carried out by a system as schematically shown in Fig. 2. Said system comprises a transistorized system conventionally known by those skilled in the art, in full bridge, formed by transistors 21 , controllers 22 and the remaining auxiliary circuits which make part of the interface between the signal-generating logic level circuit and said transistors. Such step is responsible for modulating the current supplied to the linear motor in accordance with the desired wave shape. As already known by those skilled in the art, this is, therefore, achieved by commanding the transistors 21 through controllers 22, with pulsing signals counting with pulses varying in their duration in accordance with a sinusoidal signal.
Output signal of this system type, as shown in Fig. 3, provides wave shapes of voltage 31 and current 32 capable of being applied to a linear motor.
Wave shape of voltage 31 is modulated at high frequency but with a component value at the relevant fundamental frequency. Wave shape of current 32 is, nevertheless, almost purely sinusoidal, only having a small wave at high frequency resulting from the filtering effected by a motor inductive component. And said motor is highly benefited since the injected current that generates flow can be converted to work given that the system controls the current phase to be in alignment with the speed of motor 1 or with the back electromotive force 13.
The wave shape of voltage 31 is modulated at high frequency but with component value at the relevant fundamental frequency. Wave shape of current 32 is, nevertheless, purely sinusoidal, possessing only a small wave at high frequency as a result of the filtering effected by a motor inductive component. And said motor is significantly benefited since it is the injected current that generates flow and as such it has substantially low content of harmonics, wherein almost all this flow can be converted to work given that the system controls the phase of said current to be in alignment with the speed of motor 1 or the back electromotive force 13.
It is important to note that for drives from rectangular wave shape the smaller is the drained power the shorter will be the active conduction time, i.e. in which voltage and current are different from zero and having the same polarity. Consequently, this causes the harmonic components proportional to the fundamental to become greater when the power is low, and such situation is commonly seen in refrigerators which normally reach the compressor maximum power only at load transients or in the initial or sporadic temperature decrease.
However, in accordance with the method of the present invention, and specifically in situations where a low power is drained, the obtained current 32 is proportionally low but without losing sinusoidal shape which is a particularity thereof. Therefore, in this range a significant gain that can be obtained by using the method of the present invention is more evident.
Fig 4 shows a comparative experimental result referring to gain in effectiveness of one same linear motor 1 , wherein curve 41 referring to the linear motor 1 driven by the presently disclosed electric drive method (sinusoidal PWM modulation) and curve 42 referring to said linear motor 1 driven by conventional methods pertaining to the present state of the art. The gain of curve 41 is especially interesting in an operation range of important interest for refrigeration applications.
Another important result accomplished by the electric drive method of the present invention refers to an improvement in the capacity of said linear motor 1 , since holding the motor at zero current is not required.
Furthermore, the electric drive method of the present invention is especially interesting when used in conjunction with a control of linear motor stroke described in BR Patent Application PI1 103776-8 assigned to the same assignee of the present invention. Under this specific circumstance, the electric drive method for linear motor essentially based on sinusoidal pulse width modulation technique permits to optimize the control system of the linear motor drive stroke.
Attention should be drawn to the fact that the description above aims at providing a preferred exemplary embodiment of the present invention.
Therefore, for those skilled in the art it is clear that the scope of the present invention also contemplates other analogous embodiments and/or equivalents, the features of which are disclosed and limited by the appended claims.

Claims

1 . Electric drive method for linear motor essentially comprising at least a propeller and a shifter, said method being characterized in that it comprises:
generation of electric signal to provide electrical feed to a linear motor (1 ), based on the sinusoidal pulse width modulation technique;
electric voltage (31 ) of electric signal comprising at least a wave segment of quadratic spectrum;
electric current (32) of electric signal comprising at least a wave segment of essentially sinusoidal spectrum; and
wherein said sinusoidal pulse width modulation technique is cooperative with the linear motor (1 ).
2. Electric drive method for linear motor, in accordance with claim 1 , characterized in that said sinusoidal pulse width modulation technique provides three modulation levels.
3. Electric drive method for linear motor, in accordance with claim 1 , characterized in that said sinusoidal pulse width modulation technique provides two modulation levels.
4. Electric drive method for linear motor, in accordance with claim 1 , characterized in that the generation of electric signal (3) is obtained by means of transistorized systems.
5. Electric drive method for linear motor, in accordance with claim 1 , characterized in that said generation of electric signal (3) is obtained by means of microcontrolled systems.
PCT/BR2013/000216 2012-06-20 2013-06-18 Electric drive method for linear motor Ceased WO2013188940A2 (en)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
BRBR1020120152525 2012-06-20
BR102012015252-5A BR102012015252A2 (en) 2012-06-20 2012-06-20 LINEAR MOTOR ELECTRIC DRIVE METHOD

Publications (2)

Publication Number Publication Date
WO2013188940A2 true WO2013188940A2 (en) 2013-12-27
WO2013188940A3 WO2013188940A3 (en) 2014-04-17

Family

ID=49769486

Family Applications (1)

Application Number Title Priority Date Filing Date
PCT/BR2013/000216 Ceased WO2013188940A2 (en) 2012-06-20 2013-06-18 Electric drive method for linear motor

Country Status (2)

Country Link
BR (1) BR102012015252A2 (en)
WO (1) WO2013188940A2 (en)

Cited By (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
EP3115606A1 (en) * 2015-07-07 2017-01-11 Whirlpool S.A. A method and a system for protecting a resonant linear compressor
US12553432B1 (en) 2025-03-11 2026-02-17 Haier Us Appliance Solutions, Inc. Dynamic flux weakening for a single phase linear compressor

Families Citing this family (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
BR102021018108A2 (en) 2021-09-13 2023-03-28 Freed Participaçoes S/A CONVEYOR BELT DRIVED BY LINEAR INDUCTION MOTOR WITH DOUBLE-SIDED PRIMARY AND LONG SECTIONED SECONDARY
BR102021021562A2 (en) 2021-10-27 2023-05-09 Haka Groups Participações De Negócios S/A LINEAR DRIVE FOR CONTINUOUS TRANSPORT EQUIPMENT OF BULK MATERIALS

Family Cites Families (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US6969967B2 (en) * 2003-12-12 2005-11-29 Ut-Battelle Llc Multi-level dc bus inverter for providing sinusoidal and PWM electrical machine voltages
BRPI1001388A2 (en) * 2010-05-05 2011-12-27 Whirlpool Sa resonant linear compressor piston control system, resonant linear compressor piston control method and resonant linear compressor

Cited By (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
EP3115606A1 (en) * 2015-07-07 2017-01-11 Whirlpool S.A. A method and a system for protecting a resonant linear compressor
CN106337793A (en) * 2015-07-07 2017-01-18 惠而浦股份公司 A method and a system for protecting a resonant linear compressor
US12553432B1 (en) 2025-03-11 2026-02-17 Haier Us Appliance Solutions, Inc. Dynamic flux weakening for a single phase linear compressor

Also Published As

Publication number Publication date
BR102012015252A2 (en) 2014-07-29
WO2013188940A3 (en) 2014-04-17

Similar Documents

Publication Publication Date Title
Niapour et al. Review of permanent-magnet brushless DC motor basic drives based on analysis and simulation study
Hakami et al. Torque ripple reduction and flux-droop minimization of DTC with improved interleaving CSFTC of IM fed by three-level NPC inverter
WO2013188940A2 (en) Electric drive method for linear motor
Ronanki et al. Comparative analysis of DITC and DTFC of switched reluctance motor for EV applications
US5838129A (en) Driving method for multiple-pole motors with optimum driving waveform
Ma et al. Torque ripple reduction for mutually coupled switched reluctance motor by bipolar excitations
Aguirre et al. FOC and DTC comparison in PMSM for railway traction application
Pittam et al. Torque ripple minimization of four-phase switched reluctance motor using direct torque control with an innovative switching sequence scheme
Yoo et al. A study on output torque analysis and high efficiency driving method of BLDC motor
Mirnikjoo et al. Multi-objective optimization of a permanent magnet synchronous motor for gearless elevator
Ali et al. Direct current deadbeat predictive controller for bldc motor using single dc-link current sensor
CN108574448A (en) A kind of PWM control methods of optimization electric efficiency
Jing et al. Research on torque ripple optimization of switched reluctance motor based on finite element method
CN206533211U (en) A kind of polygon excitation magneto
Abdel-Kader Improved PI-Controller of switched reluctance motor for torque ripple minimization in electric vehicle applications
Anekunu Control of switched reluctance generator for wind energy applications
Yamamoto et al. Basic study of direct current excited reluctance motor
Kumar et al. Speed Control of BIdc Motor Drive By Using PID Controller‖
Nakazawa et al. Improvement of efficiency of switched reluctance motor by single pulse control based on linear torque equation
Zhu et al. Method of reducing noise and torque ripple of switched reluctance motor
Keyan et al. Study on direct torque control system of switched reluctance motor
CN101662200B (en) Dual-control double-drive permanent-magnet direct-current brushless motor
Jang et al. Dynamic drive analysis through base speed determination for optimum control boundary in PMLSM with self-load
De Oliveira et al. Comparative dynamic performance of switched reluctance motor in flow control of centrifugal pump
CN109474117A (en) A kind of pulsed energy conservation wheel hub

Legal Events

Date Code Title Description
121 Ep: the epo has been informed by wipo that ep was designated in this application

Ref document number: 13734307

Country of ref document: EP

Kind code of ref document: A2

122 Ep: pct application non-entry in european phase

Ref document number: 13734307

Country of ref document: EP

Kind code of ref document: A2