US20010028236A1 - Speed control apparatus for synchronous reluctance motor - Google Patents

Speed control apparatus for synchronous reluctance motor Download PDF

Info

Publication number
US20010028236A1
US20010028236A1 US09/814,935 US81493501A US2001028236A1 US 20010028236 A1 US20010028236 A1 US 20010028236A1 US 81493501 A US81493501 A US 81493501A US 2001028236 A1 US2001028236 A1 US 2001028236A1
Authority
US
United States
Prior art keywords
speed
operator
current
phase
voltage
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.)
Granted
Application number
US09/814,935
Other versions
US6414462B2 (en
Inventor
Dal-Ho Cheong
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.)
LG Electronics Inc
Original Assignee
LG Electronics Inc
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
Priority to KR00/15348 priority Critical
Priority to KR15348/2000 priority
Priority to KR1020000015348A priority patent/KR100354775B1/en
Application filed by LG Electronics Inc filed Critical LG Electronics Inc
Assigned to LG ELECTRONICS, INC. reassignment LG ELECTRONICS, INC. ASSIGNMENT OF ASSIGNORS INTEREST (SEE DOCUMENT FOR DETAILS). Assignors: CHEONG, DAL-HO
Publication of US20010028236A1 publication Critical patent/US20010028236A1/en
Publication of US6414462B2 publication Critical patent/US6414462B2/en
Application granted granted Critical
Application status is Expired - Fee Related legal-status Critical
Anticipated expiration legal-status Critical

Links

Images

Classifications

    • HELECTRICITY
    • H02GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
    • H02PCONTROL OR REGULATION OF ELECTRIC MOTORS, ELECTRIC GENERATORS OR DYNAMO-ELECTRIC CONVERTERS; CONTROLLING TRANSFORMERS, REACTORS OR CHOKE COILS
    • H02P25/00Arrangements or methods for the control of AC motors characterised by the kind of AC motor or by structural details
    • H02P25/02Arrangements 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
    • H02P25/08Reluctance motors

Abstract

A speed control apparatus for a synchronous reluctance motor is disclosed. The speed control apparatus includes a voltage detector for detecting a voltage applied to the motor, a first phase converter for receiving voltages in three phases from the voltage detector and converting the three-phase voltages into equivalent voltages in two phases, a current detector for detecting a current applied to the motor, a second phase converter for receiving currents in three phases from the current detector and converting the three-phase currents into equivalent currents in two phases, and a rotor speed operator for receiving the two-phase voltages thereby computing a speed of a rotor included in the motor. A speed controller for receiving a deviation between a speed command externally inputted and an output value from the rotor speed operator is provided for generating a torque-related current command. A current controller receives a deviation between a torque current command externally inputted and an output value from the rotor speed operator thereby outputting a torque-related current command. A current controller for receives a deviation between the torque-related current command and a torque-related current outputted from the second phase converter, thereby outputting a torque-related voltage command along with a magnetic-flux-related voltage command.

Description

    BACKGROUND OF THE INVENTION
  • 1. Field of the Invention [0001]
  • The present invention relates to a speed control apparatus for a synchronous reluctance motor, and more particularly to a speed control apparatus for a synchronous reluctance motor which can accurately control the rotating speed of the motor, in accordance with a variation in load, without using any sensor adapted to detect the position of a rotor included in the motor. Description of the Related Art [0002]
  • A synchronous motor, which is a kind of an AC motor, is a constant-speed motor which rotates at a fixed speed, irrespective of the load applied thereto at a certain frequency, that is, at a synchronous speed. In particular, in a synchronous reluctance motor, torque is generated, based on reluctance components. Accordingly, the rotation of the rotor included in the synchronous reluctance motor results from only a reluctance torque. [0003]
  • FIG. 1 is a plan view schematically illustrating a configuration of a conventional three-phase synchronous reluctance motor. [0004]
  • Referring to FIG. 1, the conventional three-phase synchronous reluctance motor, which is denoted by the reference numeral [0005] 100, includes a stator 101 adapted to create a rotating magnetic field upon receiving an AC voltage applied thereof, and a rotor 102 arranged inside the stator 101 and adapted to rotate by virtue of the rotating magnetic field created by the stator 101.
  • As shown in FIG. 2, the rotor [0006] 102 is divided into four regions each formed with grooves 102 h. The grooves 102 h of each rotor region are symmetrical with those of a facing one of the remaining rotor regions. The grooves 10 h are adapted to generate an increased difference between a reluctance generated in a d-axis direction and a reluctance generated in a q-axis direction, thereby generating a reluctance torque for rotating the rotor 102. In FIG. 2, the reference numeral 102 f denotes a flow of magnetic flux generated by virtue of the magnetic field created by the stator 101.
  • FIG. 3 is a block diagram schematically illustrating a conventional speed control apparatus applied to a three-phase synchronous reluctance motor having the above-mentioned configuration. [0007]
  • As seen in FIG. 3, the conventional speed control apparatus includes a speed controller [0008] 301 for receiving a deviation between a speed command value outputted from a main control unit (not shown) and an actual speed of the three-phase synchronous reluctance motor 310 detected by a rotor position detector 309. The speed controller 301 controls the speed of a rotor 102 included in a synchronous reluctance motor 310 based on the speed deviation. The speed control apparatus also includes a magnetic flux command generator 305 for receiving an output signal from the rotor position detector 309 and computing a magnetic flux angle of the rotor 102 based on the received output signal.
  • The speed control apparatus also includes a magnetic flux angle operator [0009] 307 for receiving an output signal from the rotor position detector 309, thereby computing a magnetic flux angle of the rotor; a coordinate converter 308 for conducting a coordinate conversion of a three-phase current inputted to the synchronous reluctance motor 310 into a two-phase; and a magnetic flux controller 306 for receiving an output signal from the magnetic flux command generator 305 and an output from the coordinate converter 308, thereby controlling a magnetic flux-related current.
  • The speed control apparatus further includes a current controller [0010] 302 for receiving a deviation between an output signal from the speed controller 301 and the output signal from the coordinate converter 308, along with an output signal from the magnetic flux controller 306, thereby generating a torque-related voltage command and a magnetic flux-related command. The speed control apparatus also includes a voltage generator 303 for receiving the torque-related voltage command and magnetic flux-related command outputted from the current controller 302 and the output signal from the magnetic flux angle operator 307, thereby outputting a three-phase voltage command. An inverter 304 receives the three-phase voltage command from the voltage generator 303 and supplies an AC voltage corresponding to the received three-phase voltage command to the three-phase synchronous reluctance motor 310.
  • In the conventional speed control apparatus having the above-mentioned configuration, the speed controller [0011] 301 receives a deviation between a speed command outputted from the main control unit (not shown) and a speed value of the three-phase synchronous reluctance motor 310 fed back from the rotor position detector 309. The speed controller 301 then outputs a current command iqs * relating to a torque in the q-axis direction of a rotating coordinate system, based on the received speed deviation.
  • The magnetic flux command generator [0012] 305 detects a positive torque range and a positive output range from the output signal from the rotor position detector 309, thereby outputting a current command ids * relating to magnetic flux in the d-axis direction of the rotating coordinate system. The magnetic flux controller 306 receives a deviation between the magnetic-flux-related current value ids * outputted from the magnetic flux command generator 305, and a two-phase-converted magnetic-flux-related current value ids outputted from the coordinate converter 308, thereby controlling a magnetic-flux-related current.
  • The magnetic flux angle operator [0013] 307 receives the output signal from the rotor position detector 309, thereby computing a A magnetic flux angle {circumflex over (θ)} of the rotor. Based on the magnetic flux angle {circumflex over (θ)}, the coordinate converter 308 conducts a coordinate conversion for a three-phase current inputted to the synchronous reluctance motor 310 into a two-phase, that is, a q and d-axis phase.
  • The current controller [0014] 302 receives the torque-related current command iqs * and the magnetic-flux-related current command ids *, and generates a torque-related voltage command Vqs * and a magnetic-flux-related voltage command Vds *, respectively. The torque-related voltage Vqs * and magnetic-flux-related voltage commands Vds * are applied to the voltage generator 303, which also receives the magnetic flux angle {circumflex over (θ)} from the magnetic flux angle operator 307. Based on these received signals, the voltage generator 303 outputs three-phase voltage commands Vas, Vbs, and Vcs. The inverter 304 then applies a corresponding voltage to the synchronous reluctance motor 310 based on the three-phase voltage commands Vas, Vbs, and Vcs.
  • In a speed control apparatus according to the above-mentioned conventional synchronous reluctance motor, a sensor such as an encoder or a hall IC is used for the rotor position detector [0015] 309 and adapted to obtain information about the position of the rotor. However, there are various technical difficulties with an application of such a sensor to refrigerators or air conditioners.
  • SUMMARY OF THE INVENTION
  • The present invention has been made in view of the above mentioned problems, and an object of the invention is to provide a speed control apparatus for a synchronous reluctance motor which can accurately control the rotating speed of the motor by detecting only the current and voltage of each phase flowing in the motor without using any separate sensor that is necessarily adapted to detect the position of a rotor included in the motor. [0016]
  • These and other objects are accomplished by a speed control apparatus for a synchronous reluctance motor comprising a voltage detector for detecting a voltage applied to the synchronous reluctance motor; a first phase converter for receiving voltages in three phases outputted from the voltage detector based on the voltage detection thereof, and converting the three-phase voltages into equivalent voltages in two phases; a current detector for detecting a current applied to the synchronous reluctance motor; a second phase converter for receiving currents in three phases outputted from the current detector based on the current detection thereof, and converting the three-phase currents into equivalent currents in two phases; and a rotor speed operator for receiving the two-phase voltages outputted from the first phase converter, thereby computing a speed of a rotor included in the synchronous reluctance motor. [0017]
  • These and other objects are further accomplished by a method of controlling operating speed and operating torque for a synchronous reluctance motor, the method comprising the steps of detecting each phase current and each phase voltage of said motor; and controlling rotating speed and torque of said motor based on inductance variations determined from each phase current and each phase voltage of a stator of said motor. [0018]
  • In accordance with the present invention, it is possible to accurately control the rotating speed and torque of the motor by detecting only the current and voltage applied to the motor without using any separate sensor adapted to detect the position of a rotor included in the motor. In order to achieve an enhancement in control accuracy, an inductance calculation is conducted, and an inductance compensation is carried out based on the result of the inductance calculation. [0019]
  • Advantages of the present invention will become more apparent from the detailed description given hereinafter. However, it should be understood that the detailed description and specific examples, while indicating preferred embodiments of the present invention, are given by way of illustration only, since various changes and modifications within the spirit and scope of the present invention will become apparent to those skilled in the art from this detailed description.[0020]
  • BRIEF DESCRIPTION OF THE DRAWINGS
  • The present invention will become more fully understood from the detailed description given hereinbelow and the accompanying drawings which are given by way of illustration only, and thus do not limit the present invention. [0021]
  • FIG. 1 is a plan view schematically illustrating a configuration of a conventional three-phase synchronous reluctance motor; [0022]
  • FIG. 2 is a view illustrating the operation of a rotor included in the synchronous reluctance motor shown in FIG. 1; [0023]
  • FIG. 3 is a block diagram schematically illustrating a conventional speed control apparatus applied to a three-phase synchronous reluctance motor having the configuration of FIG. 1; [0024]
  • FIG. 4 is a block diagram illustrating a speed control apparatus for a synchronous reluctance motor according to the present invention; [0025]
  • FIG. 5 is a block diagram illustrating a rotor speed operator included in the speed control apparatus of FIG. 4; [0026]
  • FIG. 6 is a graph depicting a variation in the inductance of a general synchronous reluctance motor; [0027]
  • FIG. 7 is a graph depicting respective vector variations of the voltage and current in a general synchronous reluctance motor; and [0028]
  • FIG. 8 is a graph depicting a variation in the inductance of a general synchronous reluctance motor depending on a variation in current.[0029]
  • DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS
  • Referring to FIG. 4, a speed control apparatus for a synchronous reluctance motor according to the present invention is illustrated. As shown in FIG. 4, the speed control apparatus includes a voltage detector [0030] 412 for detecting a voltage applied to the synchronous reluctance motor denoted by the reference numeral 413, a first phase converter 411 for receiving voltages Vas, Vbs, and Vcs in three phases outputted from the voltage detector 412 based on the voltage detection thereof, and converting those three-phase voltages Vas, Vbs, and Vcs into equivalent voltages Vds and Vqs in two phases.
  • A current detector [0031] 409 for detecting a current applied to the synchronous reluctance motor 413 is provided with a second phase converter 408 for receiving currents ias, ibs, and ics in three phases outputted from the current detector 409, and converting those three-phase currents ias, ibs, and ics into equivalent currents ids and iqs in two phases.
  • The speed control apparatus also includes a rotor speed operator [0032] 410 for receiving the two-phase voltages Vds and Vqqs outputted from the first phase converter 411, thereby computing the speed of a rotor included in the synchronous reluctance motor 413. A speed controller 401 for receiving a deviation between a speed command ωr * externally inputted and an output value {circumflex over (ω)}r from the rotor speed operator 410 is provided for generating a current command iqs * relating to torque in the q-axis direction of a rotating coordinate system.
  • A magnetic flux command generator [0033] 405 for receiving the output signal from the rotor speed operator 410 is provided for detecting a positive torque range and a positive output range in accordance with the rotating speed of the synchronous reluctance motor 413, and outputting a current command ids * relating to magnetic flux in the d-axis direction of the rotating coordinate system. A magnetic flux controller 406 for receiving a deviation between the output signal ids * from the magnetic command generator 405 and the current ids from the second phase converter 408 relating to magnetic flux in the d-axis direction of the rotating coordinate system is provided for controlling magnetic flux.
  • The speed control apparatus further includes a magnetic flux angle operator [0034] 407 for receiving the output signal from the rotor speed operator 410, thereby computing a magnetic flux angle {circumflex over (θ)} for a coordinate conversion. A current controller 402 for receiving a deviation between the torque current command iqs * from the speed controller 401 and the current iqs from the second phase converter 408 relating to torque in the q-axis direction of the rotating coordinate system, along with an output signal from the magnetic flux controller 406, outputs a torque-related voltage command Vqs * and a magnetic-flux-related voltage command Vds * to the voltage generator 403.
  • The voltage generator [0035] 403 converts the two-phase voltage commands Vqs * and Vds * into voltages Vas, Vbs, and Vcs in three phases, and then outputs the three-phase voltages Vas, Vbs, and Vcs. An inverter 404 receives the three-phase voltages Vas, Vbs, and Vcs from the voltage generator 403, conducts a pulse width modulation for those three-phase voltages Vas, Vbs, and Vcs, and applies the resultant modulated voltages to the synchronous reluctance motor 413.
  • As shown in FIG. 5, the rotor speed operator [0036] 410 includes an induced voltage operator 501 for receiving respective outputs from the first and second phase converters 411 and 408, and calculating the voltage actually induced in the motor 413. An excited current operator 502 for receiving respective outputs from the first and second phase converters 411 and 408 is provided which calculates an excited current in the motor 413.
  • An induced voltage estimating operator [0037] 503 for receiving the output from the second phase converter 408, estimates a voltage induced in the motor 413. An excited current estimating operator 504 receives an output from the induced voltage estimating operator 503, thereby estimating a current excited in the motor 413.
  • The rotor speed operator [0038] 410 includes a first proportional-integral controller 505 for receiving a deviation between respective outputs from the induced voltage operator 501 and induced voltage estimating operator 503, thereby conducting a proportional-integral control. The rotor speed operator 410 also includes a second proportional-integral controller 506 for receiving a deviation between respective outputs from the excited current operator 502 and excited current estimating operator 504, thereby conducting a proportional-integral control.
  • The operation of the speed control apparatus of the present invention having the above-mentioned configuration will now be described in conjunction with FIGS. [0039] 4 to 8.
  • The speed controller [0040] 401 receives a deviation between a speed command ωr * inputted from the main control unit (not shown) to the system and a speed value {circumflex over (ω)}r estimated for a speed of the synchronous reluctance motor 413 and fed back from the rotor speed operator 410. The speed controller 401 then generates a current command iqs * relating to torque in the q-axis direction of the rotating coordinate system based on these received values.
  • The magnetic flux command generator [0041] 405 receives the estimated speed value {circumflex over (ω)}r, detects a positive torque range and a positive output range, and outputs a current command ids * relating to magnetic flux in the d-axis direction of the rotating coordinate system. The magnetic flux controller 406 receives a deviation between the magnetic-flux-related current command ids * from the magnetic flux command generator 405 and a current ids from the second phase converter 408 relating to magnetic flux in the d-axis of the rotating coordinate system. The magnetic flux controller 406 controls magnetic flux in response to the received deviation.
  • The estimated speed value {circumflex over (ω)}[0042] r outputted from the rotor speed operator 410 is also applied to the magnetic flux angle operator 407. The magnetic flux operator 407, in turn, computes a magnetic flux angle {circumflex over (θ)} of the rotor based on the received value. The first and second phase converters 411 and 408, respectively, convert voltages in three phases and currents in three phases detected from the synchronous reluctance motor 413 and based on the magnetic flux angle {circumflex over (θ)}, into two phases corresponding to the q and d-axes of the rotating coordinate system, respectively.
  • The induced voltage operator [0043] 501 included in the rotor speed operator 410 receives the two-phase voltages Vds and Vqs and the two-phase currents ids and iqs respectively outputted from the first and second phase converters 411 and 408. The induced voltage operator calculates a voltage actually induced in the synchronous reluctance motor 413 based on the voltages and currents it receives. This induced voltage em is derived using the following Equation 1:
  • [Equation 1][0044]
  • e m =V s −r s ·i s
  • where, “e[0045] m”, “Vs”, and “is” represent the induced voltage, the input voltage to the motor 413, and the input current to the motor 413, respectively.
  • In order to achieve an estimation for a speed of the motor [0046] 413, a deviation between the output em from the induced voltage operator 501 and an output êm from the induced voltage estimation operator 503, “em−êm”, is inputted to the first proportional-integral controller 505. The first proportional-integral controller 505 conducts a proportional-integral control based on the received deviation “em−êm”, thereby outputting an estimated speed {circumflex over (ω)}r, of the motor 413. The speed controller 401 then receives a deviation between the speed command ωr * and the estimated speed {circumflex over (ω)}r, thereby outputting a current command iqs * relating to torque in the q-axis direction of the rotating coordinate system.
  • Concurrently, and as shown in FIG. 8, respective inductances L[0047] d and Lq resulting from a load concurrently applied to the motor 413 exhibit different variations from each other in accordance with the input current. Since there is a great difference in inductance between a low load and a high load, it is necessary to compensate for an inductance resulting from a load applied to the motor 413.
  • Therefore, a deviation between an output i[0048] m from the excited current operator 502 and an output îm from the excited current estimating operator 504, that is, “im−îm”, is applied to the second proportional-integral controller 506. The second proportional-integral controller 506, in turn, conducts a proportional-integral operation for the input value, and outputs the resultant value to the inducted voltage estimating operator 503 so as to achieve an inductance compensation depending on the load applied to the motor 413.
  • The current controller [0049] 402 receives a deviation between the torque-related current command iqs * and the torque-related current iqs outputted from the second phase converter 408, along with the output signal from the magnetic flux controller 406, thereby outputting a torque-related voltage command Vqs * and a magnetic-flux-related voltage command Vds *. These torque-related voltage Vqs * and magnetic-flux-related voltage commands Vds * are applied to the voltage generator 403, which also receives the magnetic flux angle {circumflex over (θ)} from the magnetic flux operator 407.
  • The voltage generator [0050] 403 then generates voltages Vas, Vbs, and Vcs in three phases based on the received values. The three-phase voltages Vas, Vbs, and Vcs are then applied to the inverter 404, which in turn conducts a pulse width modulation for the applied voltages and applies the resultant voltages to the synchronous reluctance motor 413.
  • As shown in FIG. 6, the synchronous reluctance motor [0051] 413 exhibits an inductance variation characteristic during a rotation of the rotor conducted in accordance with the three-phase voltages applied to the motor 413. Referring to FIG. 6, it can be found that the inductance variation depends on the rotating angle of the rotor. Accordingly, when the inductance variation is derived by detecting the input voltage and current of the stator included in the motor 413, it is possible to determine the position of the rotor. Thus, the speed of the rotor can be controlled using the derived inductance variation.
  • FIG. 7 is a graph depicting the vectors showing the relationships among the position of the rotor, the voltage applied to the motor, and the current applied to the motor. [0052]
  • Referring to the vector diagram of FIG. 7, the voltage applied to the synchronous reluctance motor can be expressed by the following Equations 2 and 3: [0053]
  • [Equation 2][0054]
  • V ds =r s i ds +dds)/dt−ω rλqs
  • [Equation 3][0055]
  • V qs =r s i qs +dqs)/dt+ω rλds
  • where, “V[0056] ds” and “Vqs” represent respective stator voltages in the d and q-axis directions, “rs” represents the resistance of the stator, “ids” and “iqs” represent respective stator currents in the d and q-axis directions, “λds” and “λqs” respective magnetic fluxes in the d and q-axis directions, and “ωr” represents the rotor speed of the motor.
  • Since λ[0057] ds=Ldis, and λqs=Lqis, it is possible to calculate the d and q-axis inductances Ld and Lq by detecting the associated voltages and currents. Since the calculated d and q-axis inductances vary in accordance with a shifted position of the rotor included in the rotor of FIG. 2, it is possible to find information about the position of the rotor by calculating, in real time, those inductances.
  • Based on the inductance variations, an estimated value {circumflex over (ω)}[0058] r for the rotor speed ωr can be calculated. Accordingly, it is possible to control the speed of the motor by comparing the A estimated speed {circumflex over (ω)}r with the speed command ωr *.
  • As is apparent from the above description, the present invention provides a speed control apparatus for a synchronous reluctance motor which can accurately control the rotating speed and torque of the motor by detecting only the current and voltage of each phase flowing in the motor without using any separate sensor, such as an encoder or a hall IC necessarily adapted to detect the position of a rotor included in the motor. [0059]
  • Further, an inductance calculation is conducted and an inductance compensation is carried out based on the result of the inductance calculation in order to achieve an enhancement in control accuracy. Thus, it is possible to achieve an effective control system for the rotating speed of the motor with increased accuracy. In addition, for an application involving a difficult detection for the position and speed of a rotor, such as in the compressor of a refrigerator or air conditioner, the present invention is ideally suited as a means of accurately detecting rotor position and controlling rotor speed with a simplified system. [0060]
  • The present invention being thus described, it will be obvious that the same may be varied in many ways. Such variations are not to be regarded as a departure from the spirit and scope of the present invention, and all such modifications as would be obvious to one skilled in the art are intended to be included within the scope of the following claims. [0061]

Claims (17)

What is claimed is:
1. A speed control apparatus for a synchronous reluctance motor comprising:
a voltage detector for detecting a voltage applied to the synchronous reluctance motor;
a first phase converter for receiving voltages in three phases outputted from the voltage detector based on the voltage detection thereof, and converting the three-phase voltages into equivalent voltages in two phases;
a current detector for detecting a current applied to the synchronous reluctance motor;
a second phase converter for receiving currents in three phases outputted from the current detector based on the current detection thereof, and converting the three-phase currents into equivalent currents in two phases; and
a rotor speed operator for receiving the two-phase voltages outputted from the first phase converter, thereby computing a speed of a rotor included in the synchronous reluctance motor.
2. The speed control apparatus according to
claim 1
further comprising a speed controller for receiving a deviation between a speed command externally inputted and an output value from the rotor speed operator, thereby generating a torque-related current command.
3. The speed control apparatus according to
claim 2
further comprising:
a current controller for receiving a deviation between a torque current command externally inputted and an output value from the rotor speed operator, thereby outputting a torque-related current command;
a current controller for receiving a deviation between the torque-related current command outputted from the speed controller and a torque-related one of the two-phase currents outputted from the second phase converter, thereby outputting a torque-related voltage command along with a magnetic-flux-related voltage command;
a voltage generator for converting the two-phase voltage commands, outputted from the current controller, into voltages in three phase; and
an inverter for conducting a pulse width modulation for the three-phase voltages outputted from the voltage generator, and applying the resultant voltages to the synchronous reluctance motor.
4. The speed control apparatus according to
claim 1
, further comprising:
a magnetic command generator for receiving the output value from the rotor speed operator, thereby detecting a positive torque range and a positive output range in accordance with a rotating speed of the synchronous reluctance motor, and outputting a magnetic-flux-related current command;
a magnetic flux controller for receiving a deviation between the output signal from the magnetic command generator and a magnetic-flux-related one of the two-phase currents outputted from the second phase converter, thereby conducting a magnetic flux control for the current controller to generate the magnetic-flux-related voltage command; and
a magnetic flux angle operator for receiving the output value from the rotor speed operator, thereby computing a magnetic flux angle for a coordinate conversion.
5. The speed control apparatus according to
claim 3
, further comprising:
a magnetic command generator for receiving the output value from the rotor speed operator, thereby detecting a positive torque range and a positive output range in accordance with a rotating speed of the synchronous reluctance motor, and outputting a magnetic-flux-related current command;
a magnetic flux controller for receiving a deviation between the output signal from the magnetic command generator and a magnetic-flux-related one of the two-phase currents outputted from the second phase converter, thereby conducting a magnetic flux control for the current controller to generate the magnetic-flux-related voltage command; and
a magnetic flux angle operator for receiving the output value from the rotor speed operator, thereby computing a magnetic flux angle for a coordinate conversion.
6. The speed control apparatus according to
claim 1
, wherein the rotor speed operator comprises:
an induced voltage operator for receiving respective outputs from the first and second phase converters, thereby calculating a voltage actually induced in the motor;
an excited current operator for receiving the respective outputs from the first and second phase converters, thereby calculating an excited current in the motor;
an induced voltage estimating operator for receiving the outputs from the second phase converter, thereby estimating a voltage induced in the motor;
an excited current estimating operator for receiving an output from the induced voltage estimating operator, thereby estimating a current excited in the motor;
a first proportional-integral controller for receiving a deviation between respective outputs from the induced voltage operator and the induced voltage estimating operator, thereby conducting a proportional-integral control; and
a second proportional-integral controller for receiving a deviation between respective outputs from the excited current operator and the excited current estimating operator, thereby conducting a proportional-integral control.
7. The speed control apparatus according to
claim 6
, wherein said first proportional-integral controller outputs an estimated speed value.
8. The speed control apparatus according to
claim 7
, wherein said estimated speed value is outputted to the induced voltage estimating operator.
9. The speed control apparatus according to
claim 6
, wherein said second proportional-integral controller outputs a resultant value from said proportional-integral control to the induced voltage estimating operator to achieve an inductance compensation depending on a load applied to said motor.
10. The speed control apparatus according to
claim 3
, wherein the rotor speed operator comprises:
an induced voltage operator for receiving respective outputs from the first and second phase converters, thereby calculating a voltage actually induced in the motor;
an excited current operator for receiving the respective outputs from the first and second phase converters, thereby calculating an excited current in the motor;
an induced voltage estimating operator for receiving the outputs from the second phase converter, thereby estimating a voltage induced in the motor;
an excited current estimating operator for receiving an output from the induced voltage estimating operator, thereby estimating a current excited in the motor;
a first proportional-integral controller for receiving a deviation between respective outputs from the induced voltage operator and the induced voltage estimating operator, thereby conducting a proportional-integral control; and
a second proportional-integral controller for receiving a deviation between respective outputs from the excited current operator and the excited current estimating operator, thereby conducting a proportional-integral control.
11. The speed control apparatus according to
claim 10
, wherein said first proportional-integral controller outputs an estimated speed value.
12. The speed control apparatus according to
claim 11
, wherein said estimated speed value is outputted to the induced voltage estimating operator.
13. The speed control apparatus according to
claim 10
, wherein said second proportional-integral controller outputs a resultant value from said proportional-integral control to the induced voltage estimating operator to achieve an inductance compensation depending on a load applied to said motor.
14. A method of controlling operating speed and operating torque for a synchronous reluctance motor, said method comprising the steps of:
detecting each phase current and each phase voltage of said motor; and
controlling rotating speed and torque of said motor based on inductance variations determined from each phase current and each phase voltage of a stator of said motor.
15. The method according to
claim 8
further comprising the steps of:
determining a deviation between a desired speed command and an estimated speed value of a rotor of said motor;
determining a magnetic flux angle of the rotor based on said estimated speed value;
converting detected voltages and detected currents of said motor in three phases into converted two phase voltages and currents, respectively;
calculating an induced voltage of said motor based on said converted two phase voltages and currents, respectively;
generating a current command corresponding to torque in a q-axis direction of a rotating coordinate system of said motor based on said deviation; and
generating a second current command corresponding to magnetic flux in a d-axis direction of said rotating coordinate system.
16. The method according to
claim 15
, further comprising the step of determining said estimated speed value based on a deviation between said induced voltage and an estimated induced voltage.
17. The method according to
claim 16
, wherein proportional-integral control is used to determine said estimated speed value.
US09/814,935 2000-03-25 2001-03-23 Speed control apparatus for synchronous reluctance motor Expired - Fee Related US6414462B2 (en)

Priority Applications (3)

Application Number Priority Date Filing Date Title
KR00/15348 2000-03-25
KR15348/2000 2000-03-25
KR1020000015348A KR100354775B1 (en) 2000-03-25 Speed control apparatus of a synchronous reluctance motor

Publications (2)

Publication Number Publication Date
US20010028236A1 true US20010028236A1 (en) 2001-10-11
US6414462B2 US6414462B2 (en) 2002-07-02

Family

ID=19658603

Family Applications (1)

Application Number Title Priority Date Filing Date
US09/814,935 Expired - Fee Related US6414462B2 (en) 2000-03-25 2001-03-23 Speed control apparatus for synchronous reluctance motor

Country Status (3)

Country Link
US (1) US6414462B2 (en)
JP (1) JP3410451B2 (en)
DE (1) DE10106404B4 (en)

Cited By (10)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
GB2371427A (en) * 2000-10-19 2002-07-24 Lg Electronics Inc Speed control of synchronous reluctance motor
US6595757B2 (en) * 2001-11-27 2003-07-22 Kuei-Hsien Shen Air compressor control system
EP1492223A1 (en) * 2002-03-22 2004-12-29 Matsushita Electric Industrial Co., Ltd. Synchronous reluctance motor control device
US20060032710A1 (en) * 2003-02-27 2006-02-16 Kone Corporation Method and apparatus for adjustment of the rotor angle of an elevator motor
US20100083693A1 (en) * 2008-10-03 2010-04-08 Johnson Controls Technology Company Variable speed drive with pulse-width modulated speed control
CN104467568A (en) * 2014-12-15 2015-03-25 中国矿业大学 Switch reluctance motor braking torque closed-loop control system and method
US20150115850A1 (en) * 2012-06-15 2015-04-30 Danfoss Drives A/S Variable torque angle for electric motor
US20150188472A1 (en) * 2012-06-15 2015-07-02 Danfoss Drives A/S Method for controlling a synchronous reluctance electric motor
WO2017040585A1 (en) * 2015-09-01 2017-03-09 Jpw Industries Inc. Power tool with digital variable reluctance motor control
EP3252941A4 (en) * 2015-01-28 2018-10-03 Kabushiki Kaisha Toshiba Inverter control apparatus and motor driving system

Families Citing this family (27)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JP3979561B2 (en) * 2000-08-30 2007-09-19 株式会社日立製作所 AC motor drive system of
EP1341293A4 (en) * 2000-11-09 2009-05-06 Daikin Ind Ltd Synchronous motor control method and device
CN1244196C (en) * 2001-04-24 2006-03-01 三菱电机株式会社 Apparatus for controlling synchronous motor
JP3818086B2 (en) * 2001-06-01 2006-09-06 株式会社日立製作所 Synchronous motor driving device
KR100421373B1 (en) * 2001-06-20 2004-03-06 엘지전자 주식회사 Apparatus for rotary velocity control of synchronous reluctance motor
US6683428B2 (en) * 2002-01-30 2004-01-27 Ford Global Technologies, Llc Method for controlling torque in a rotational sensorless induction motor control system with speed and rotor flux estimation
US6838778B1 (en) 2002-05-24 2005-01-04 Hamilton Sundstrand Corporation Integrated starter generator drive having selective torque converter and constant speed transmission for aircraft having a constant frequency electrical system
US6838779B1 (en) * 2002-06-24 2005-01-04 Hamilton Sundstrand Corporation Aircraft starter generator for variable frequency (vf) electrical system
US6809496B2 (en) * 2002-09-16 2004-10-26 Honeywell International Inc. Position sensor emulator for a synchronous motor/generator
US6943524B2 (en) * 2003-12-09 2005-09-13 A. O. Smith Corporation Switched reluctance motor regulation
US7193383B2 (en) * 2005-07-06 2007-03-20 Honeywell International, Inc. Enhanced floating reference frame controller for sensorless control of synchronous machines
US7895003B2 (en) * 2007-10-05 2011-02-22 Emerson Climate Technologies, Inc. Vibration protection in a variable speed compressor
US8950206B2 (en) 2007-10-05 2015-02-10 Emerson Climate Technologies, Inc. Compressor assembly having electronics cooling system and method
US8539786B2 (en) 2007-10-08 2013-09-24 Emerson Climate Technologies, Inc. System and method for monitoring overheat of a compressor
US8418483B2 (en) 2007-10-08 2013-04-16 Emerson Climate Technologies, Inc. System and method for calculating parameters for a refrigeration system with a variable speed compressor
US20090092502A1 (en) * 2007-10-08 2009-04-09 Emerson Climate Technologies, Inc. Compressor having a power factor correction system and method
US9541907B2 (en) * 2007-10-08 2017-01-10 Emerson Climate Technologies, Inc. System and method for calibrating parameters for a refrigeration system with a variable speed compressor
US8448459B2 (en) * 2007-10-08 2013-05-28 Emerson Climate Technologies, Inc. System and method for evaluating parameters for a refrigeration system with a variable speed compressor
US20090092501A1 (en) * 2007-10-08 2009-04-09 Emerson Climate Technologies, Inc. Compressor protection system and method
US8459053B2 (en) * 2007-10-08 2013-06-11 Emerson Climate Technologies, Inc. Variable speed compressor protection system and method
JP2009232498A (en) * 2008-03-19 2009-10-08 Sanyo Electric Co Ltd Motor control device
JP5332301B2 (en) * 2008-05-12 2013-11-06 富士電機株式会社 Permanent magnet synchronous motor control device
JP5559504B2 (en) * 2009-09-30 2014-07-23 セミコンダクター・コンポーネンツ・インダストリーズ・リミテッド・ライアビリティ・カンパニー Motor drive control circuit
CN102361431B (en) * 2011-10-19 2013-10-30 安徽鑫龙电器股份有限公司 Double-speed motor controller and control method thereof
US8912743B2 (en) * 2011-11-01 2014-12-16 Simmonds Precision Products, Inc. Apparatus and method of determining rotor position in a salient-type motor
KR101438638B1 (en) * 2013-08-14 2014-09-05 현대자동차 주식회사 Apparatus of controlling vehicle provided with motor and method thereof
CN103825516B (en) * 2013-12-31 2016-07-06 清华大学 A synchronous motor controller compound

Family Cites Families (7)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US4088934A (en) * 1976-10-04 1978-05-09 General Electric Company Means for stabilizing an a-c electric motor drive system
US4740738A (en) * 1986-09-17 1988-04-26 Westinghouse Electric Corp. Reluctance motor control system and method
US5670854A (en) * 1994-12-14 1997-09-23 Matsushita Electric Industrial Co., Ltd. Control system for an induction motor
JP3401155B2 (en) * 1997-02-14 2003-04-28 株式会社日立製作所 Synchronous motor control device and an electric vehicle
US5936378A (en) * 1997-03-27 1999-08-10 Matsushita Electric Industrial Co., Ltd. Motor controller
US6078119A (en) * 1997-11-26 2000-06-20 Ebara Corporation Bearingless rotary machine
US6281656B1 (en) * 1998-09-30 2001-08-28 Hitachi, Ltd. Synchronous motor control device electric motor vehicle control device and method of controlling synchronous motor

Cited By (19)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
GB2371427A (en) * 2000-10-19 2002-07-24 Lg Electronics Inc Speed control of synchronous reluctance motor
US6650083B2 (en) 2000-10-19 2003-11-18 Lg Electronics Inc. Speed control apparatus of synchronous reluctance motor and method thereof
GB2371427B (en) * 2000-10-19 2004-10-06 Lg Electronics Inc Speed control apparatus of synchronous reluctance motor and method thereof
US6595757B2 (en) * 2001-11-27 2003-07-22 Kuei-Hsien Shen Air compressor control system
EP1492223A1 (en) * 2002-03-22 2004-12-29 Matsushita Electric Industrial Co., Ltd. Synchronous reluctance motor control device
EP1492223A4 (en) * 2002-03-22 2005-12-14 Matsushita Electric Ind Co Ltd Synchronous reluctance motor control device
US20060032710A1 (en) * 2003-02-27 2006-02-16 Kone Corporation Method and apparatus for adjustment of the rotor angle of an elevator motor
US7121385B2 (en) * 2003-02-27 2006-10-17 Kone Corporation Method and apparatus for adjustment of the rotor angle of an elevator motor
US20100083693A1 (en) * 2008-10-03 2010-04-08 Johnson Controls Technology Company Variable speed drive with pulse-width modulated speed control
US8336323B2 (en) * 2008-10-03 2012-12-25 Johnson Controls Technology Company Variable speed drive with pulse-width modulated speed control
US20150115850A1 (en) * 2012-06-15 2015-04-30 Danfoss Drives A/S Variable torque angle for electric motor
US20150188472A1 (en) * 2012-06-15 2015-07-02 Danfoss Drives A/S Method for controlling a synchronous reluctance electric motor
US9692337B2 (en) * 2012-06-15 2017-06-27 Danfoss Drives A/S Method for controlling a synchronous reluctance electric motor
US9692340B2 (en) * 2012-06-15 2017-06-27 Danfoss Drives A/S Variable torque angle for electric motor
CN104467568A (en) * 2014-12-15 2015-03-25 中国矿业大学 Switch reluctance motor braking torque closed-loop control system and method
EP3252941A4 (en) * 2015-01-28 2018-10-03 Kabushiki Kaisha Toshiba Inverter control apparatus and motor driving system
US10158305B2 (en) 2015-01-28 2018-12-18 Kabushiki Kaisha Toshiba Inverter controller and motor driving system
WO2017040585A1 (en) * 2015-09-01 2017-03-09 Jpw Industries Inc. Power tool with digital variable reluctance motor control
US10189136B2 (en) 2015-09-01 2019-01-29 Jpw Industries Inc. Power tool with digital variable reluctance motor control

Also Published As

Publication number Publication date
DE10106404B4 (en) 2012-10-31
US6414462B2 (en) 2002-07-02
DE10106404A1 (en) 2001-10-04
JP3410451B2 (en) 2003-05-26
JP2001346396A (en) 2001-12-14
KR20010090396A (en) 2001-10-18

Similar Documents

Publication Publication Date Title
US6501243B1 (en) Synchronous motor-control apparatus and vehicle using the control apparatus
JP3668870B2 (en) Synchronous motor drive system
US6555988B2 (en) Motor control device
KR100790914B1 (en) Active reduction of torque irregularities in rotating machines
US7352151B2 (en) Method of estimating magnetic pole position in motor and apparatus of controlling the motor based on the estimated position
US6577096B2 (en) Sensorless vector control system of induction motor and method thereof
JP3411878B2 (en) The rotor position estimation method of the synchronous motor, position sensorless control method and control apparatus
JP3611492B2 (en) Inverter control method and apparatus
US6339308B2 (en) Vector control method for synchronous reluctance motor
JP5257365B2 (en) The motor control apparatus and control method thereof
Schroedl et al. Sensorless control of reluctance machines at arbitrary operating conditions including standstill
US5796228A (en) Method of controlling rotary magnet multi-phase synchronous motor and control therefor
EP1748544B1 (en) Motor controller, washing machine, air conditioner and electric oil pump
JP3752247B2 (en) Amplitude detecting method and apparatus for high-frequency impedance tracking type sensorless algorithm
US6700343B2 (en) Motor controller
US6735284B2 (en) System for controlling motor and method for the same
US20050146306A1 (en) Sensorless controller of ac motor and control method
EP1263125A2 (en) Drive control apparatus and method of alternating current motor
US7348749B2 (en) Control device for synchronous motor
JP3454210B2 (en) Position sensorless control method of the synchronous motor
CN100373768C (en) Position sensorless control algorithm for AC machine
JP3982232B2 (en) Sensorless control apparatus and the control method of the synchronous generator
JP3627683B2 (en) Motor control device
EP0175154A2 (en) Method of controlling inverter-driven induction motor
EP1876702B1 (en) Motor control device

Legal Events

Date Code Title Description
AS Assignment

Owner name: LG ELECTRONICS, INC., KOREA, REPUBLIC OF

Free format text: ASSIGNMENT OF ASSIGNORS INTEREST;ASSIGNOR:CHEONG, DAL-HO;REEL/FRAME:011638/0367

Effective date: 20010223

FPAY Fee payment

Year of fee payment: 4

REMI Maintenance fee reminder mailed
LAPS Lapse for failure to pay maintenance fees
STCH Information on status: patent discontinuation

Free format text: PATENT EXPIRED DUE TO NONPAYMENT OF MAINTENANCE FEES UNDER 37 CFR 1.362

FP Expired due to failure to pay maintenance fee

Effective date: 20100702