EP1588479A2 - Commande de tension de moteur polyphase pour enroulements de phase presentant differentes epaisseurs de fil et des spires d'enroulement differentes - Google Patents

Commande de tension de moteur polyphase pour enroulements de phase presentant differentes epaisseurs de fil et des spires d'enroulement differentes

Info

Publication number
EP1588479A2
EP1588479A2 EP04706436A EP04706436A EP1588479A2 EP 1588479 A2 EP1588479 A2 EP 1588479A2 EP 04706436 A EP04706436 A EP 04706436A EP 04706436 A EP04706436 A EP 04706436A EP 1588479 A2 EP1588479 A2 EP 1588479A2
Authority
EP
European Patent Office
Prior art keywords
motor
speed range
phase windings
recited
electromagnets
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.)
Withdrawn
Application number
EP04706436A
Other languages
German (de)
English (en)
Inventor
Alexander A. Gladkov
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.)
Matra Manufacturing and Services SAS
Original Assignee
Wavecrest Laboratories LLC
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 claimed from US10/352,896 external-priority patent/US6836087B2/en
Priority claimed from US10/352,897 external-priority patent/US6847147B2/en
Application filed by Wavecrest Laboratories LLC filed Critical Wavecrest Laboratories LLC
Publication of EP1588479A2 publication Critical patent/EP1588479A2/fr
Withdrawn legal-status Critical Current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
    • H02P6/00—Arrangements for controlling synchronous motors or other dynamo-electric motors using electronic commutation dependent on the rotor position; Electronic commutators therefor
    • H02P6/32—Arrangements for controlling wound field motors, e.g. motors with exciter coils
    • 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
    • H02P6/00—Arrangements for controlling synchronous motors or other dynamo-electric motors using electronic commutation dependent on the rotor position; Electronic commutators therefor
    • H02P6/08—Arrangements for controlling the speed or torque of a single motor
    • 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
    • H02P25/16—Arrangements or methods for the control of AC motors characterised by the kind of AC motor or by structural details characterised by the circuit arrangement or by the kind of wiring
    • 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
    • H02P7/00—Arrangements for regulating or controlling the speed or torque of electric DC motors

Definitions

  • the present invention relates to the control of a multiphase motor, more particularly to the application of different voltages to individual phase windings of differing winding and wire gauge topologies through a succession of motor operating speed ranges.
  • isolation of the electromagnet segments permits individual concentration of flux in each magnetic core segment, with virtually no flux loss or deleterious transformer interference effects from flux interaction with other core segments. Operational advantages can be gained by configuring a single pole pair as an autonomous electromagnet. Magnetic path isolation of the individual pole pair from other pole pairs eliminates a flux transformer effect on an adjacent group when the energization of the pole pair windings is switched.
  • the available magnetomotive force is dependent upon the number of winding turns and energization current.
  • the term "motor topology” is used herein to refer to physical motor characteristics, such as dimensions and magnetic properties of stator cores, the number of coils of stator windings and wire diameter (gauge), etc.
  • the available magnetomotive force dictates a variable, generally inverse, relationship between torque and speed over an operating range.
  • An applied energization current may drive the motor to a nominal operating speed.
  • FIG. 1 This figure is a plot of motor efficiency versus operating speed over a wide speed range for motors having different topologies.
  • the topologies represented in this figure differ solely in the number of stator winding turns.
  • Each efficiency curve approaches a peak value as the speed increases from zero to a particular speed and then decreases toward zero efficiency.
  • Curve A which represents the motor with the greatest number of winding turns, exhibits the steepest slope to reach peak efficiency at the earliest speed V2. Beyond this speed, however, the curve exhibits a similarly steep negative slope.
  • the speed range window at which this motor operates at or above an acceptable level of efficiency indicated as X% in Figure 1, is relatively narrow.
  • Curves B through E represent motors with successively fewer winding turns. As the number of winding turns decreases, the motor operating speed for maximum efficiency increases. Curve B attains peak efficiency at speed V3, Curve C at V4, Curve D at V5 and Curve E at V6. Each motor has peak efficiency at a different motor operating speed, and none has acceptable efficiency over the entire range of motor operating speeds. In motor applications in which the motor is to be driven over a wide speed range, such as in a vehicle drive environment, Fig. 1 indicates that there is no ideal single motor topology that will provide uniformly high operating efficiency over the entire speed range. For example, at speeds above V6 curves A and B indicate zero efficiency. At the lower end of the speed range, for example up to V2, curves C through E indicate significantly lower efficiency than curves A and B.
  • each speed range 1 and a different number of the motor stator winding coils that are to be energized are designated for each speed range to obtain maximum efficiency for each of a plurality of operating speed ranges.
  • the number of energized coils is changed when the speed crosses a threshold between adjacent speed ranges.
  • Each winding comprises a plurality of individual, serially connected, coil sets separated by tap connections. Each respective tap is connected by a switch to a source of energization during a single corresponding speed range. The windings thus have a different number of energized coils for each speed range.
  • phase winding energization can be tailored to obtain maximum efficiency in each of several operating speed ranges from startup to the maximum speed at which a motor can be expected to operate.
  • the number of, and identity of, the phase windings that are to be energized, as well as the magnitude of the individually applied predefined voltages, may differ for each speed range.
  • the predefined optimal voltages should be applied on a dynamic basis in accordance with the sensed speed of the motor.
  • phase windings While the predefined voltages for the phase windings can be derived to provide optimal efficiency over the entire motor operating speed range for a given torque, many motor applications exist which require control for variable motor speed, such as in motor vehicles. Motor output torque should be adjusted in accordance with a user's input command related to desired speed. The further need thus exists for developing applied phase winding voltages that optimize efficiency throughout the operating speed range at variable torque output in accordance with user command.
  • the present invention fulfills the above-described needs for controlling, through a plurality of operating speed ranges, a multiphase motor having a plurality of ferromagnetically isolated stator electromagnets distributed about an axis of rotation, each electromagnet having a phase winding formed on a ferromagnetic core. Successive ranges of speed during which the motor can be expected to operate are defined. A specific subset of the electromagnets is associated for each speed range, each specific subset comprising a different combination of electromagnets. Respective voltage magnitudes to be applied to each phase winding for each defined speed range are predefined. The motor speed is sensed throughout motor operation. In each defined speed range, only the electromagnets of the associated subset are energized, each of the energized electromagnets having applied thereto a different predefined voltage magnitude.
  • the present invention is particularly advantageous in that the different phase winding topologies of the electromagnets, wherein each phase winding has a different total number of coil turns and a different wire gauge from each of the other phase windings, permits division of the entire operating speed range into many narrow ranges in which fine adjustment for efficiency can be obtained.
  • at least one of the total number of electromagnet phase windings may be deenergized.
  • Phase windings that are energized with specified predefined voltages during one speed range may also be energized, with different predefined voltages, during another defined speed range.
  • the number and identity of phase windings energized during one defined speed range may be different from the number and identity of phase windings energized during another defined speed range.
  • a further advantage of the present invention is that the predefined voltage magnitudes for all speed ranges can be set for maximum motor torque output. Adjustment of the predefined voltage magnitudes can be made in accordance with a user torque input command to obtain optimal motor drive efficiency at other torque outputs.
  • the user torque input command can vary through a range between zero torque and maximum torque.
  • the control system can multiply the predefined maximum torque voltage magnitudes for all speed ranges by the fractional value corresponding to the user input to obtain optimal motor drive efficiency at all torque outputs.
  • Fig. 1 is a plot of motor efficiency versus motor operating speed over a wide speed range for different conventional motors having different numbers of winding turns.
  • Fig. 2 is an exemplary configuration of rotor and stator elements that may be employed in the present invention.
  • Fig. 3 is a chart exhibiting wire gauges and total number of winding turns for each phase of a multiphase motor exemplifying the present invention.
  • Fig. 4 is a partial block diagram of a voltage supply circuit for the motor of Fig. 2.
  • Fig. 5 is an exemplary plot of voltage applied to each phase winding of the motor of Fig. 2 over the operating speed range.
  • Fig. 6 is a plot of motor efficiency versus motor operating speed for voltages applied in accordance with Fig. 5.
  • Fig. 2 is an exemplary configuration of rotor and stator elements that may be employed in the present invention.
  • Rotor member 20 is an annular ring structure having permanent magnets 21 spaced from each other and substantially evenly distributed along cylindrical back plate 25.
  • the permanent magnets are rotor poles that alternate in magnetic polarity along the inner periphery of the annular ring.
  • the rotor surrounds a stator member 30, the rotor and stator members being separated by an annular radial air gap.
  • Stator 30 comprises a plurality of electromagnet core segments of uniform construction that are evenly distributed along the air gap.
  • the stator comprises seven core segments, each core segment formed in a generally u-shaped magnetic structure 36 with two poles having surfaces 32 facing the air gap.
  • the legs of the pole pairs are wound with windings 38, although the core segment may be constructed to accommodate a single winding formed on a portion linking the pole pair.
  • Each stator electromagnet core structure is separate, and magnetically isolated, from adjacent stator core elements.
  • Each of the core segments can be considered to represent a phase, the phase windings identified successively along the air gap by labels 38a-38g.
  • the stator elements 36 are secured to a non-magnetically permeable support structure, thereby forming an annular ring configuration. This configuration eliminates emanation of stray transformer flux effects from adjacent stator pole groups.
  • Appropriate stator support structure which has not been illustrated herein so that the active motor elements are more clearly visible, can be seen in the aforementioned patent application.
  • Windings 38a-38g differ from each other in winding topology with respect to wire gauges and total number of winding coil turns. While it is preferable in this embodiment that each phase winding has a unique number of total winding turns and a unique wire gauge, two or more phase windings may have similar wire gauges or number of turns. Other embodiments may comprise a greater number of isolated core segment pole pairs. It may be preferable in such embodiments that some phase windings have the same winding topology.
  • Fig. 3 is a chart exemplifying phase winding topologies for a seven phase motor illustrated in Fig. 2. Each phase winding has a unique number of coil turns and is constructed of a unique wire gauge. The total copper mass of each of the phase windings is the same.
  • Fig. 4 is a partial block diagram of a voltage supply circuit for the motor of Fig. 2.
  • Phase windings 38a-38g are connected to d-c power supply 40 via a series connection, respectively, with voltage converters 42a-42g.
  • a control terminal of each voltage converter is coupled to controller 44, which is also connected across power supply 40.
  • the controller and voltage converters are conventional devices as described more fully in the copending Maslov et al. Application 10/173,610.
  • the controller 44 which may comprise a microprocessor and associated storage means, may have one or more user inputs and a plurality of inputs for motor conditions sensed during operation.
  • a motor speed input is the only motor condition feedback input shown.
  • the speed input signal may be generated by any conventional motor speed sensor.
  • Stored in the controller is a table that identifies a voltage level to be applied to each phase winding for each of a plurality of speed ranges over the operating range. Voltage values that have been found to provide maximum operating efficiency at maximum motor torque output for each of the phase windings 38a-38g in various speed ranges are identified in the table below. The efficiency of operation for each range is also set forth in the table.
  • the controller 44 accesses data from the table to determine which phase windings are to be energized at startup and the level of voltage to be applied to each phase winding.
  • the controller outputs the appropriate control voltages for these values to the respective voltage converters connected to the phase windings.
  • the controller accesses the stored table to receive voltage data for each phase winding at the speed range in which the sensed speed is located.
  • New control signals corresponding to the accessed data, are output to the voltage converters to change, if appropriate, the voltages applied to the phase windings.
  • the controller will adjust its output control voltages for these changes as provided by the table thereby to maintain optimum operation efficiency over the entire operating speed range.
  • the table represents a speed operating range of 360 rpm that is very finely divided for application of precisely adjusted voltage levels. This information is provided in graphic form in Fig. 5, each curve representing voltages applied to a respective phase winding throughout the range.
  • Curve 1 represents voltages applied to phase winding 38a;
  • curve 2 represents voltages applied to phase winding 38c;
  • curve 3 represents voltages applied to phase winding 38e;
  • curve 4 represents voltages applied to phase winding 38g;
  • curve 5 represents voltages applied to phase winding 38b;
  • curve 6 represents voltages applied to phase winding 38d;
  • curve 7 represents voltages applied to phase winding 38f.
  • phase windings During different portions of the operational speed range, different combinations of phase windings will be energized. At no time are all seven phase windings energized. As evident from the table and Fig. 5, at starting, four phase windings are energized with changing voltage levels as shown up to speed of 100 rpm. For speeds between 100 and 140 rpm, three phase windings are energized with voltage levels as shown; between 140 and 160 rpm. Two phase windings are energized; between 160 and 180 rpm. three phase windings are energized; between 180 and 220 rpm.
  • phase windings are energized; between 220 to 230 three windings are energized; between 230 and 290 two phase windings are energized; and at speeds greater than 290 only a single winding is energized.
  • different combinations of energized phase windings are identified and are to be supplied with different energization voltages.
  • Fig. 6 Motor efficiency for operation in accordance with the table over the entire speed range is illustrated graphically in Fig. 6. Comparison of this curve with the efficiency curves of conventionally operated motors, shown in Fig. 1, illustrates the improved operating efficiency of the present invention.
  • the stator winding configuration of the present invention when energized in accordance with the voltages indicated in the table over the motor operating range, provides a motor operating efficiency in excess of eighty per cent over approximately three quarters of the speed range.
  • the controller user input illustrated in Fig. 4 represents a torque command signal, such as described in the above-identified U.S. patent Application number 10/173,610.
  • a vehicle drive application example is described therein, the user input representing desired torque indicated by the user's throttle command.
  • the user may vary the throttle between zero and a maximum level.
  • An increase in throttle is indicative of a command to increase speed, which is realized by an increase in torque.
  • Description of to this point of the motor operation has focussed on control at maximum motor torque output, for which the corresponding user input represents maximum throttle.
  • the variable user torque input command range is related to a fractional value that is variable between zero for a zero torque input command and one for maximum torque input command.
  • Motor speed is repetitively sampled and fed as a signal input to the controller.
  • the controller in response to the sensed speed signal input will access stored data stored representing the voltage magnitude values in the table and multiply these voltage magnitude values by the fractional value that corresponds to the user torque input command setting.
  • speed signals for different speed ranges are received, the appropriate voltage magnitude values are obtained from the table and new control signals, which are products of these voltage magnitudes and the fractional value for the user input command are produced.
  • optimal motor drive efficiency is achieved for all speed ranges. Maximum operational efficiency is similarly obtained for all set user torque inputs for all speed ranges.
  • motor topologies can vary significantly for different numbers of poles, pole dimensions and configurations, pole compositions, etc.
  • Different numbers of coil sets and speed range subsets can be chosen to suit particular topologies.
  • the number of turns on each stator core segment can be varied with all wire being of the same gauge.
  • the configuration of the coil sections may be varied to meet optimum efficiency curves for different topologies. Threshold levels may be adjusted to increase and/or decrease one or more speed ranges, thus setting a more even or uneven speed range subset distribution.

Landscapes

  • Engineering & Computer Science (AREA)
  • Power Engineering (AREA)
  • Control Of Ac Motors In General (AREA)
  • Brushless Motors (AREA)
  • Control Of Electric Motors In General (AREA)
  • Windings For Motors And Generators (AREA)

Abstract

L'invention concerne un moteur polyphasé qui comporte une pluralité d'électro-aimants de stator ferromagnétiquement isolés, répartis autour d'un axe de rotation. Des plages successives de vitesses de fonctionnement présumé du moteur sont définies. Un sous-ensemble spécifique des électro-aimants est associé à chaque plage de vitesses, chaque sous-ensemble spécifique comprenant une combinaison différente d'électro-aimants. On définit préalablement les amplitudes de tension respectives devant être appliquées à chaque enroulement de phase pour chaque plage de vitesses définie. La vitesse du moteur est détectée pendant toute la durée de fonctionnement du moteur. Dans chaque plage de vitesses définie, seuls les électro-aimants du sous-ensemble associé sont excités, une amplitude de tension prédéfinie différente étant appliquée à chaque électro-aimant excité.
EP04706436A 2003-01-29 2004-01-29 Commande de tension de moteur polyphase pour enroulements de phase presentant differentes epaisseurs de fil et des spires d'enroulement differentes Withdrawn EP1588479A2 (fr)

Applications Claiming Priority (5)

Application Number Priority Date Filing Date Title
US352896 2003-01-29
US10/352,896 US6836087B2 (en) 2003-01-29 2003-01-29 Multiphase motor voltage control for phase windings of different wire gauges and winding turns
US10/352,897 US6847147B2 (en) 2003-01-29 2003-01-29 Dynamoelectric machine having windings that differ in wire gauge and number of winding turns
US352897 2003-01-29
PCT/US2004/002376 WO2004070882A2 (fr) 2003-01-29 2004-01-29 Commande de tension de moteur polyphase pour enroulements de phase presentant differentes epaisseurs de fil et des spires d'enroulement differentes

Publications (1)

Publication Number Publication Date
EP1588479A2 true EP1588479A2 (fr) 2005-10-26

Family

ID=32853076

Family Applications (1)

Application Number Title Priority Date Filing Date
EP04706436A Withdrawn EP1588479A2 (fr) 2003-01-29 2004-01-29 Commande de tension de moteur polyphase pour enroulements de phase presentant differentes epaisseurs de fil et des spires d'enroulement differentes

Country Status (8)

Country Link
EP (1) EP1588479A2 (fr)
JP (1) JP2006515147A (fr)
KR (1) KR20050097527A (fr)
AU (1) AU2004210316A1 (fr)
BR (1) BRPI0407161A (fr)
CA (1) CA2510646C (fr)
MX (1) MXPA05008104A (fr)
WO (1) WO2004070882A2 (fr)

Family Cites Families (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US5912522A (en) * 1996-08-22 1999-06-15 Rivera; Nicholas N. Permanent magnet direct current (PMDC) machine with integral reconfigurable winding control
US6493924B2 (en) * 2000-12-02 2002-12-17 Kendro Laboratory Products, Inc. Method for enabling a high torque/high speed brushless DC motor
US6577087B2 (en) * 2001-05-10 2003-06-10 Ut-Battelle, Llc Multilevel DC link inverter

Non-Patent Citations (1)

* Cited by examiner, † Cited by third party
Title
See references of WO2004070882A2 *

Also Published As

Publication number Publication date
CA2510646A1 (fr) 2004-08-19
CA2510646C (fr) 2007-06-12
BRPI0407161A (pt) 2006-11-14
KR20050097527A (ko) 2005-10-07
WO2004070882A2 (fr) 2004-08-19
JP2006515147A (ja) 2006-05-18
WO2004070882A3 (fr) 2004-09-23
AU2004210316A1 (en) 2004-08-19
MXPA05008104A (es) 2005-10-19

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