CN104104202A - Brushless DC (Direct Current) motor with brushless AC (Alternating Current) composite excitation - Google Patents
Brushless DC (Direct Current) motor with brushless AC (Alternating Current) composite excitation Download PDFInfo
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- CN104104202A CN104104202A CN201410356061.1A CN201410356061A CN104104202A CN 104104202 A CN104104202 A CN 104104202A CN 201410356061 A CN201410356061 A CN 201410356061A CN 104104202 A CN104104202 A CN 104104202A
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Abstract
The invention discloses a brushless DC (Direct Current) motor with brushless AC (Alternating Current) composite excitation. When a stator excitation winding end adopts an AC variable frequency excitation winding, high excitation efficiency and wide excitation range at a low rotating speed are achieved; a rotor power excitation unit performs composite power excitation by using a DC winding and a permanent magnet; a stator power winding can perform excitation square wave electricity generation by adopting a three-phase or multi-phase winding; the motor running power density is great, and the running range is wide, so that brushless DC motor with the brushless AC composite excitation can be used for power generation running and electric running. The brushless DC motor with the brushless AC composite excitation comprises a stator excitation winding, a motor rotor and a stator power winding; the motor rotor comprises a rotor excitation winding, a rotary rectifier and the rotor power excitation unit; the rotor power excitation unit comprises the DC winding and the permanent magnet; the DC winding is wound on the permanent magnet, and the DC winding and the permanent magnet perform composite excitation.
Description
Technical field
The invention belongs to the technical field of alternative electric generation brshless DC motor, particularly a kind of brushless ac compound rectifier excitation brshless DC motor.
Background technology
More than one, since century, motor comprises that generator and motor are as electromechanical energy conversion device, and its range of application has spreaded all among the every field and daily life of national economy.The main Types of motor has direct current machine, synchronous machine and asynchronous machine and three kinds.
Direct current machine shortcoming: structure relative complex, has increased manufacturing cost; During commutation, can produce spark, limit the scope of application; Synchronous machine shortcoming: breakdown torque is subject to permanent magnet degaussing constraint, poor, the high rotating speed of shock resistance is restricted, power is less, the high and starting difficulty of cost.Asynchronous machine shortcoming: drive circuit complexity causes that system cost is high, electric efficiency and power density on the low side.
Secondly also have the other types motors such as brshless DC motor, brushless dual-feed motor, brushless synchronous machine, wherein:
DC brushless motor shortcoming: price is high, controller requires high, easily forms resonance.Brushless dual-feed motor shortcoming: brushless dual-feed motor system model is complicated; When load variations is larger, can not remain the mechanical property that synchronous machine is hard; Exciting current is larger, and operate power and efficiency are low; Excitation loss is higher, poor stability, poor reliability.Brushless synchronous machine shortcoming: the DC excitation winding of brushless synchronous machine excitation side, under the slow-speed of revolution, excitation efficiency reduces, and excitation easily lost efficacy, power density is on the low side.
In addition, technical from current brushless exciting motor, brushless exciting motor electricity excitation part adopts direct current excitation mostly, as patent of invention number be ZL.200310106347.6 hybrid exciting synchronous motor and as patent of invention number be the double salient-pole mixed excitation synchronous machine of ZL.200310106346.1, what produce due to direct current is with respect to changeless magnetic field, excitation winding position, and it exists the risk of the low and easy inefficacy of excitation efficiency when motor speed is lower.
The embodiment of brushless excitation generator as shown in figure 13, while generating electricity, because its rotor-side only adopts direct current winding, therefore can only carry out DC excitation, has the risk that excitation efficiency is low or excitation lost efficacy under the slow-speed of revolution, causes motor range of operation narrow.And on its rotor, only exist direct current winding to produce DC electromagnetic field, therefore can not make motor sender alternating current wave.
Brushless excitation motor embodiment as shown in figure 14, selects from the synchronous generator brushless excitation schematic diagram in < < Speed-controlled System of Synchronous Motor > > mono-book that Li Zhimin, Zhang Yujie write.Because need to first making rotor produce alternating current as motor, it just can make direct current winding produce DC electromagnetic field, so can not adopt DC excitation scheme on stator excitation winding.So adopt AC exciter to provide alternating current impression magnetic field for stator AC excitation winding in embodiment, the adjusting of exciting current can complete by controlling the delay angle of thyristor rectifier bridge.But AC exciter can only regulate current/voltage, can not regulate the ac frequency of excitation winding, therefore still exist excitation efficiency low, the problem that motor range of operation is narrow.
Above-mentionedly can find out that the electric excitation of brushless exciting motor partly adopts direct current excitation, although it is relatively simple that excitation is controlled, technology is comparative maturity also, but the existence of hybrid exciting synchronous motor or brush and slip ring makes, motor reliability is lower and environmental suitability is poor, or double salient-pole electric machine makes output voltage sine bad, or the extremely electric excitation of pawl makes complex structure, and need to consume more electric excitation magnetic kinetic potential, reduce electric excitation efficiency.In order to overcome the shortcoming of above motor, the present invention provides a kind of brushless ac compound rectifier excitation brshless DC motor in conjunction with the feature of each motor.Having solved commonly has brushless motor to have brush configuration complicated, brshless DC motor, brushless dual-feed motor, permagnetic synchronous motor and asynchronous machine power density problem on the low side.
Summary of the invention
The technical problem to be solved in the present invention is to provide a kind of brushless ac compound rectifier excitation brshless DC motor, its high, excitation wide ranges of excitation efficiency under the slow-speed of revolution when stator excitation winding terminal adopts AC frequency conversion excitation winding, rotor power excitation unit carries out hybrid power excitation by direct current winding and permanent magnet, stator power winding can adopt three-phase or polyphase windings to carry out the generating of excitation square wave, motor operate power density is large, range of operation is wide, can also can be for electric operation for generator operation.
Technical scheme of the present invention is: this brushless ac compound rectifier excitation brshless DC motor (1), it comprises stator excitation winding (2), rotor (3), stator power winding (4), described rotor (3) comprises rotor field coil (31), rotating rectifier (32), rotor power excitation unit (33), described rotor power excitation unit (33) comprises direct current winding (331) and permanent magnet (332), direct current winding (331) attached around permanent magnet (332) upper and both carry out compound rectifier excitation.
Further, described stator excitation winding (2) adopts AC frequency conversion excitation, by producing AC frequency conversion induction field at stator excitation winding (2) input frequency-changing AC electricity, make the rotor field coil (31) in rotor (3) produce alternating current, and be direct current by rotating rectifier (32) rectification, this direct current is that the direct current winding (331) in rotor power excitation unit (33) provides electric current to produce DC electromagnetic field.
Further, described rotor (3) also comprises protected location (34), and protected location (34) comprises piezo-resistance (341) and/or Absorption Capacitance (342).
Further, the mode that the winding of described stator excitation winding (2) connects comprises that star winding connection is connected with angle type winding;
The winding number of phases of described stator excitation winding (2) adopts three times phase winding;
Described stator excitation winding (2) receives AC frequency conversion exciting current, produces alternation induction field;
The mode that the winding of described rotor field coil (31) connects comprises that star winding connection is connected with angle type winding;
The winding number of phases of described stator excitation winding (31) adopts three times phase winding;
Described stator excitation winding (31) sends three-phase alternating current with the alternation induction field induction that stator excitation winding (2) produces;
The rectifier structure of described rotating rectifier (32) comprises the halfwave rectifier of diode full-bridge rectification, diode forward connection, the halfwave rectifier structure that diode reverse connects;
The three-phase alternating current electric rectification that described rotating rectifier (32) sends rotor field coil is direct current;
Described rotor power excitation unit (33) produces compound rectifier excitation magnetic field by direct current winding (331) and permanent magnet (332);
The mode that the winding of described stator power winding (4) connects comprises that star winding connection is connected with angle type winding;
The winding number of phases of described stator power winding (4) adopts three times phase winding;
Described stator power winding (4) carries out resultant field with rotor power excitation unit (33) and responds to external sender's alternating current wave.
Owing to adopting AC frequency conversion excitation in brushless exciting motor excitation side, while having solved employing DC excitation winding, the problem that the excitation efficiency that exists under the slow-speed of revolution reduces or excitation lost efficacy, thus when stator excitation winding terminal adopts AC frequency conversion excitation winding high, the excitation wide ranges of excitation efficiency under the slow-speed of revolution.Rotor power excitation unit carries out hybrid power excitation by direct current winding and permanent magnet, and stator power winding can adopt three-phase or polyphase windings to carry out the generating of excitation square wave, solves the problem that under background technology, motor operate power density is low, range of operation is narrow.Also provide simultaneously a kind of can also can be for the DC brushless motor of electric operation for generator operation.
Accompanying drawing explanation
Below in conjunction with accompanying drawing, embodiments of the invention are described further.
Fig. 1 is the 1st embodiment of brushless ac compound rectifier excitation brshless DC motor of the present invention;
Fig. 2 is the 2nd embodiment of brushless ac compound rectifier excitation brshless DC motor of the present invention;
Fig. 3 is the 3rd embodiment of brushless ac compound rectifier excitation brshless DC motor of the present invention;
Fig. 4 is the 4th embodiment of brushless ac compound rectifier excitation brshless DC motor of the present invention;
Fig. 5 is the 5th embodiment of brushless ac compound rectifier excitation brshless DC motor of the present invention;
Fig. 6 is the 6th embodiment of brushless ac compound rectifier excitation brshless DC motor of the present invention;
Fig. 7 is the 7th embodiment of brushless ac compound rectifier excitation brshless DC motor of the present invention;
Fig. 8 is the 8th embodiment of brushless ac compound rectifier excitation brshless DC motor of the present invention;
Fig. 9 is the 9th embodiment of brushless ac compound rectifier excitation brshless DC motor of the present invention;
Figure 10 is the 10th embodiment of brushless ac compound rectifier excitation brshless DC motor of the present invention;
Figure 11 is the 11st embodiment of brushless ac compound rectifier excitation brshless DC motor of the present invention;
Figure 12 is the 12nd embodiment of brushless ac compound rectifier excitation brshless DC motor of the present invention;
Figure 13 is the embodiment of common brushless excitation generator;
Figure 14 is the embodiment of common brushless excitation motor;
Figure 15 is brushless ac compound rectifier excitation brshless DC motor stator and rotor sructure schematic diagram of the present invention.
Label declaration
1 brushless ac compound rectifier excitation brshless DC motor; 2 stator excitation windings; 3 rotors; 4 stator power windings; 5 power winding terminals; 31 rotor field coils; 32 rotating rectifiers; 33 rotor power excitation unit; 34 protected locations; 331 direct current windings; 332 permanent magnets; 341 piezo-resistances; 342 Absorption Capacitances; 6 brushless excitation generators; 7 brushless excitation motor; 8 AC exciter
Embodiment
This brushless ac compound rectifier excitation brshless DC motor 1, it comprises stator excitation winding 2, rotor 3, stator power winding 4, described rotor 3 comprises rotor field coil 31, rotating rectifier 32, rotor power excitation unit 33, described rotor power excitation unit 33 comprises direct current winding 331 and permanent magnet 332, direct current winding 331 attached on permanent magnet 332 and both carry out compound rectifier excitation.
Further, described stator excitation winding 2 adopts AC frequency conversion excitation, by producing AC frequency conversion induction field at stator excitation winding 2 input frequency-changing AC electricity, make the rotor field coil 31 in rotor 3 produce alternating current, and be direct current by rotating rectifier 32 rectifications, this direct current produces DC electromagnetic field for the direct current winding 331 in rotor power excitation unit 33 provides electric current.
Further, described rotor 3 also comprises protected location 34, and protected location 34 comprises piezo-resistance 341 and/or Absorption Capacitance 342.
Further, the mode that the winding of described stator excitation winding (2) connects comprises that star winding connection is connected with angle type winding;
The winding number of phases of described stator excitation winding (2) adopts three times phase winding;
Described stator excitation winding (2) receives AC frequency conversion exciting current, produces alternation induction field;
The mode that the winding of described rotor field coil (31) connects comprises that star winding connection is connected with angle type winding;
The winding number of phases of described stator excitation winding (31) adopts three times phase winding;
Described stator excitation winding (31) sends three-phase alternating current with the alternation induction field induction that stator excitation winding (2) produces;
The rectifier structure of described rotating rectifier (32) comprises the halfwave rectifier of diode full-bridge rectification, diode forward connection, the halfwave rectifier structure that diode reverse connects;
The three-phase alternating current electric rectification that described rotating rectifier (32) sends rotor field coil is direct current;
Described rotor power excitation unit (33) produces compound rectifier excitation magnetic field by direct current winding (331) and permanent magnet (332);
The mode that the winding of described stator power winding (4) connects comprises that star winding connection is connected with angle type winding;
The winding number of phases of described stator power winding (4) adopts three times phase winding;
Described stator power winding (4) carries out resultant field with rotor power excitation unit (33) and responds to external sender's alternating current wave.
Owing to adopting AC frequency conversion excitation in brushless exciting motor excitation side, while having solved employing DC excitation winding, the problem that the excitation efficiency that exists under the slow-speed of revolution reduces or excitation lost efficacy, thus when stator excitation winding terminal adopts AC frequency conversion excitation winding high, the excitation wide ranges of excitation efficiency under the slow-speed of revolution.Rotor power excitation unit carries out hybrid power excitation by direct current winding and permanent magnet, and stator power winding can adopt three-phase or polyphase windings to carry out the generating of excitation square wave, solves the problem that under background technology, motor operate power density is low, range of operation is narrow.Also provide simultaneously a kind of can also can be for the DC brushless motor of electric operation for generator operation.
As shown in Figure 1, in brushless ac compound rectifier excitation brshless DC motor embodiment 1 of the present invention, stator excitation winding 2 has adopted the star-like connected mode of three phase windings, by incoming transport variable frequency excitation electric current, produce alternation induction field, the rotor field coil 31 of rotor 3 has adopted the star-like connected mode of three phase windings and the induction of alternation induction field to produce three-phase alternating current and has exported to rotating rectifier 32 by three-phase line, rotating rectifier forms three-phase bridge rectification circuit by rectifier diode with three phase full bridge connected mode, by three-phase alternating current electric rectification, it is direct current, by DC line, offer the direct current winding 331 of rotor power winding 33, direct current winding 331 produces the electromagnetic field identical with permanent magnet 332 magnetic directions.
When the rotor 3 of brushless ac compound rectifier excitation brshless DC motor 1 is driven by external prime mover, as generator carry out generator operation time, the outside sender's alternating current wave of stator power winding 4.
Stator power winding 4 external ACs when brushless ac compound rectifier excitation brshless DC motor 1, while carrying out electric operation as motor, the electromagnetic field that the resultant field producing due to power winding element in rotor 3 and stator power winding 4 the produce generation electromagnetic torque that interacts, thus realized the electric operation of motor.
As shown in Figure 2; in brushless ac compound rectifier excitation brshless DC motor embodiment 2 of the present invention; comparative example 1 has increased protected location 34 on its basis; protected location 34 consists of piezo-resistance 341 and Absorption Capacitance 342, and piezo-resistance 341 and Absorption Capacitance 342 are parallel in the positive and negative DC line between rotating rectifier 32 and direct current winding 331.The damage of diode when piezo-resistance 341 can protect rectifier diode to prevent the overvoltage of motor winding.And thereby Absorption Capacitance 342 can absorb overcurrent, energy storage, smooth direct current electric current protection rectifier diode.
As shown in Figure 3, in brushless ac compound rectifier excitation brshless DC motor embodiment 3 of the present invention, on comparative example 1 stator power winding 4 on its basis, adopted six phase star windings, and be divided into two groups of star-like connections of three-phase.
As shown in Figure 4, in brushless ac compound rectifier excitation brshless DC motor embodiment 4 of the present invention, on comparative example 2 stator power winding 4 on its basis, adopted six phase star windings, and be divided into two groups of star-like connections of three-phase.
As shown in Figure 5, in brushless ac compound rectifier excitation brshless DC motor embodiment 5 of the present invention, on comparative example 1 rotating rectifier 32 on its basis, adopted half-wave diode rectification.The external AC frequency conversion excitation of stator excitation winding 2, make rotor 3 rotor excitation winding 31 inductions produce three-phase alternating current, by three-phase half-bridge diode rectification, it is direct current, for direct current winding 331 provides direct current, notice that permanent magnetism magnetic pole direction and the direct solenoid field direction of permanent magnetism magnetic pole 332 is consistent.
As shown in Figure 6, in brushless ac compound rectifier excitation brshless DC motor embodiment 6 of the present invention, half-wave diode rectification square on comparative example 5 rotating rectifier 32 is on its basis to just contrary, the external AC frequency conversion excitation of stator excitation winding 2, make rotor 3 rotor excitation winding 31 inductions produce three-phase alternating current, by three-phase half-bridge diode rectification, it is direct current, for direct current winding 331 provides direct current, permanent magnetism magnetic pole direction and the direct solenoid field direction of noting permanent magnetism magnetic pole 332 are consistent, and the pole orientation of contrast permanent magnetism magnetic pole 332 is also contrary with the pole orientation in embodiment 5.
As shown in Figure 7, in brushless ac compound rectifier excitation brshless DC motor embodiment 7 of the present invention, on comparative example 1 stator excitation winding 2 on its basis, adopt six phase star windings, and be divided into two groups of star-like connections of three-phase.Corresponding rotor field coil 31 has adopted six phase star windings equally, is also divided into two groups of star-like connections of three-phase.The simultaneously corresponding employing of rotating rectifier 32 six phase full-bridge diode rectifications, by the AC rectification of rotor field coil 31 1 sides, be that direct current offers direct current winding 331, produce DC electromagnetic field.On corresponding stator power winding 4, adopt six phase star windings, be divided into equally two groups of star-like connections of three-phase.
As shown in Figure 8, in brushless ac compound rectifier excitation brshless DC motor embodiment 8 of the present invention, on comparative example 7 stator excitation winding 2 on its basis, adopted six phase star windings to carry out six mutually star-like connections, corresponding rotor field coil 31 has adopted six phase star windings to carry out six mutually star-like connections equally, on corresponding stator power winding 4, has adopted six phase star windings to carry out equally six mutually star-like connections.
As shown in Figure 9, in brushless ac compound rectifier excitation brshless DC motor embodiment 9 of the present invention, on comparative example 1 rotor field coil 31 on its basis, adopted three-phase dihedral winding to connect.
As shown in figure 10, in brushless ac compound rectifier excitation brshless DC motor embodiment 10 of the present invention, on comparative example 1 stator excitation winding 2 on its basis, adopted three-phase dihedral winding to connect.
As shown in figure 11; in brushless ac compound rectifier excitation brshless DC motor embodiment 11 of the present invention; on stator excitation winding 2 on its basis of comparative example 1, rotor field coil 31, all adopted three-phase dihedral winding to connect; and also increased on its basis protected location 34; in the present embodiment 11,34 of protected locations consist of Absorption Capacitance 342, and this Absorption Capacitance 342 is parallel in the positive and negative DC line between rotating rectifier 32 and direct current winding 331.
As shown in figure 12; in brushless ac compound rectifier excitation brshless DC motor embodiment 12 of the present invention; on comparative example 1 stator excitation winding 2, rotor field coil 31 and stator power winding 4 on its basis, all adopted three-phase dihedral winding to be connected; and also increased on its basis protected location 34; in the present embodiment 11,34 of protected locations consist of Absorption Capacitance 342, and this Absorption Capacitance 342 is parallel in the positive and negative DC line between rotating rectifier 32 and direct current winding 331.
As shown in figure 13, this is the enforcement illustration of common brushless excitation generator.In this common embodiment figure, what on stator excitation winding 2, adopt due to it is direct current winding, therefore can only carry out DC excitation, has the risk that excitation efficiency is low or excitation lost efficacy under the slow-speed of revolution, causes motor range of operation narrow.And owing to only having direct current winding 331 to produce DC electromagnetic field, therefore can not make motor sender alternating current wave in its rotor power excitation unit 33.
As shown in figure 14, this is the enforcement illustration of common brushless excitation motor.In this common embodiment figure, because need to first making rotor field coil 31 produce alternating current as motor, it could could produce DC electromagnetic field for direct current winding 331 provides the direct current after rectification, so can not adopt DC excitation scheme on stator excitation winding 2.So adopt in the present embodiment AC exciter 8 to provide alternating current impression magnetic field for stator excitation winding 2, and send alternating current and provide direct current by rectification for direct current winding 331, thereby the alternating electromagnetic field interactions that produces DC electromagnetic field and stator power winding 4 produces electromagnetic torque, thereby realized the electric operation of motor.
As shown in figure 15, this is brushless ac compound rectifier excitation brshless DC motor stator and rotor sructure schematic diagram.When actual design brushless ac compound rectifier excitation brshless DC motor stator and rotor sructure, can be that stator excitation winding 2 and rotor field coil 31 places adopt the winding motor stator and rotor sructure as shown in Figure 15-1 at variable frequency excitation end; Can be that stator power winding 4 and 33 places, rotor power excitation unit adopt the magnetic pole type stator and rotor sructure as shown in Figure 15-2 at power excitation end.
The invention discloses belong to alternative electric generation technology brshless DC motor field a kind of brushless ac compound rectifier excitation brshless DC motor.The excitation of this generator is partly different from former direct current winding excitation, has adopted first AC frequency conversion excitation, meets the wide rotating speed of motor, heavy load scope operation needs.Rotor adopts Novel composite rotor structure, and built-in rotating rectifier carries out alterating and direct current stream translation.In direct current compound rectifier excitation part, adopt the scheme of permanent magnetism magnetic pole after-combustion DC coil, form resultant field, particularly when needs carry out magnetic field intensity increase, can regulate rotor excitation current by regulating frequency and the voltage of AC excitation, excitation field intensity is automatically adjusted.Because rotor power excitation unit has adopted permanent magnetic field and direct current winding electric magnetic field two parts compound rectifier excitation.When as generator generator operation, the external sender's alternating current wave of motor stator power winding.And can change direct current winding electric magnetic field intensity by the electric current and voltage that regulates stator excitation winding voltage electric current to change rotor Partial DC winding, thereby resultant field is increased to magnetic a little less than magnetic, reach and regulate magnetic field and because excitation mode becomes AC excitation from DC excitation, motor operation range is wider.
The working method of brushless ac compound rectifier excitation brshless DC motor 1 of the present invention comprises generator operation and two kinds of modes of electric operation.
Generator operation: when described brushless ac compound rectifier excitation brshless DC motor carries out generator operation as generator, rotor 3 is driven running by external prime mover, the external AC frequency conversion exciting current of stator excitation winding 2, stator excitation winding 2 produces alternating current impression magnetic field by AC frequency conversion exciting current, rotor field coil 31 produces alternating current with induced field induction, and by AC rectification, be that the direct current winding 331 that direct current offers in rotor power excitation unit 33 produces DC induction magnetic field by rotating rectifier 32, there is a permanent magnetic field in the permanent magnet in rotor power excitation unit 33 332 simultaneously, the DC electromagnetic field that direct current winding 331 produces and the permanent magnetic field of permanent magnet 332 have formed the resultant field of rotor power excitation unit 33 jointly.Both magnetic field provides coupling magnetic field for stator power winding jointly, and the DC electromagnetic field of direct current winding 331 can on the basis of permanent magnetic field, increase magnetic a little less than magnetic regulate resultant field intensity.Stator power winding 4 induction sender alternating current waves.
Electric operation: when described brushless ac compound rectifier excitation brshless DC motor carries out electric operation as motor, the external AC frequency conversion exciting current of stator excitation winding 2, stator excitation winding 2 produces alternating current impression magnetic field by AC frequency conversion exciting current, rotor field coil 31 produces alternating current with induced field induction, and by AC rectification, be that the direct current winding 331 that direct current offers in rotor power excitation unit 33 produces DC induction magnetic field by rotating rectifier 32, there is a permanent magnetic field in the permanent magnet in rotor power excitation unit 33 332 simultaneously, the DC electromagnetic field that direct current winding 331 produces and the permanent magnetic field of permanent magnet 332 have formed the resultant field of rotor power excitation unit 33 jointly.Both magnetic field provides coupling magnetic field for stator power winding jointly, and the DC electromagnetic field of direct current winding 331 can on the basis of permanent magnetic field, increase magnetic a little less than magnetic regulate resultant field intensity.Stator power winding 4 is passed into alternating current generation alternating current impression magnetic field makes rotor produce electromagnetic torque, and rotor power excitation unit 33 produces drawing torques with 4 inductions of stator power winding and does electric operation.
Control method superiority of the present invention and technique effect are:
1, motor of the present invention adopts alternating-current brushless excitation, has avoided having brush configuration commutation easily to produce spark, problem difficult in maintenance;
2, rotor of the present invention has adopted rotating rectifier rectification, for rotor direct current winding provides direct current, generator adopts brushless direct-current winding to carry out compound (permanent magnetism+coiling) excitation, compatible wide region generating needs, improved power density and reduced motor and system cost, having solved excitation efficiency reduction or excitation inefficacy and power density problem on the low side that conventional DC excitation electromotor exists under the slow-speed of revolution;
3, rotor power excitation of the present invention unit adopts brushless direct-current winding, produces trapezoidal wave generating voltage, improves generated output, further improves power density;
4, motor of the present invention is according to watt level, and stator power winding adopts the polyphase windings such as three, six, nine, and harmonic reduction can increase substantially the efficiency of generator and system, reduces system cost.
5, motor of the present invention can either be realized as the electronic operation of motor, again can be as generator generator operation, and the compatible use needs that simultaneously need generator and motor occasion;
6, motor of the present invention can solve that brushless double feed alternating current machine exciting current is large, the problem such as operate power and efficiency is low, excitation loss is higher, power consumption, poor stability, poor reliability;
7, motor of the present invention has adopted D.C. magnetic field and permanent magnetic field compound rectifier excitation on the rotor of power winding terminal, and can be by regulating excitation terminal voltage electric current, thereby the electromagnetic field size of increase and decrease rotor direct current winding, by magnetic a little less than increasing magnetic, regulate resultant field intensity, adopted p-m rotor simultaneously, compared AC induction motor and more easily realize to motor the accurate control under various operating modes;
8, in conjunction with the advantage of synchronous machine and direct current machine, to have solved synchronous machine power less in the present invention, the high and starting difficulty of cost; The problem that asynchronous machine efficiency and power density are on the low side.
9, motor of the present invention can also adopt multi-phase excitation at AC excitation end, can further improve the excitation efficiency of motor.
Above-described embodiment is described the preferred embodiment of the present invention; not scope of the present invention is limited; design under the prerequisite of spirit not departing from the present invention; various distortion and improvement that those of ordinary skills make technical scheme of the present invention, all should fall in the definite protection range of the claims in the present invention book.
Claims (4)
1. brushless ac compound rectifier excitation brshless DC motor (1), it is characterized in that: it comprises stator excitation winding (2), rotor (3), stator power winding (4), described rotor (3) comprises rotor field coil (31), rotating rectifier (32), rotor power excitation unit (33), described rotor power excitation unit (33) comprises direct current winding (331) and permanent magnet (332), direct current winding (331) attached around permanent magnet (332) upper and both carry out compound rectifier excitation.
2. brushless ac compound rectifier excitation brshless DC motor according to claim 1, it is characterized in that: described stator excitation winding (2) adopts AC frequency conversion excitation, by producing AC frequency conversion induction field at stator excitation winding (2) input frequency-changing AC electricity, make the rotor field coil (31) in rotor (3) produce alternating current, and be direct current by rotating rectifier (32) rectification, this direct current is that the direct current winding (331) in rotor power excitation unit (33) provides electric current to produce DC electromagnetic field.
3. brushless ac compound rectifier excitation brshless DC motor according to claim 1; it is characterized in that: described rotor (3) also comprises protected location (34), protected location (34) comprises piezo-resistance (341) and/or Absorption Capacitance (342).
4. brushless ac compound rectifier excitation brshless DC motor according to claim 1, is characterized in that:
The mode that the winding of described stator excitation winding (2) connects comprises that star winding connection is connected with angle type winding;
The winding number of phases of described stator excitation winding (2) adopts three times phase winding;
Described stator excitation winding (2) receives AC frequency conversion exciting current, produces alternation induction field;
The mode that the winding of described rotor field coil (31) connects comprises that star winding connection is connected with angle type winding;
The winding number of phases of described stator excitation winding (31) adopts three times phase winding;
Described stator excitation winding (31) sends three-phase alternating current with the alternation induction field induction that stator excitation winding (2) produces;
The rectifier structure of described rotating rectifier (32) comprises the halfwave rectifier of diode full-bridge rectification, diode forward connection, the halfwave rectifier structure that diode reverse connects;
The three-phase alternating current electric rectification that described rotating rectifier (32) sends rotor field coil is direct current;
Described rotor power excitation unit (33) produces compound rectifier excitation magnetic field by direct current winding (331) and permanent magnet (332);
The mode that the winding of described stator power winding (4) connects comprises that star winding connection is connected with angle type winding;
The winding number of phases of described stator power winding (4) adopts three times phase winding;
Described stator power winding (4) carries out resultant field with rotor power excitation unit (33) and responds to external sender's alternating current wave.
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| CN104378034A (en) * | 2014-11-19 | 2015-02-25 | 北京索德电气工业有限公司 | Operation control system of brushless alternating-current hybrid excitation brushless direct-current motor |
| CN110120732A (en) * | 2019-04-23 | 2019-08-13 | 南京航空航天大学 | A kind of induction tandem brushless exciting motor |
| CN111629925A (en) * | 2018-01-23 | 2020-09-04 | 王志林 | Motor driving system for electric automobile, machining method, electric automobile and vehicle shell |
| CN113162354A (en) * | 2021-04-30 | 2021-07-23 | 陕西航空电气有限责任公司 | Brushless electric excitation synchronous generator with wide rotating speed range |
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| CN104378034A (en) * | 2014-11-19 | 2015-02-25 | 北京索德电气工业有限公司 | Operation control system of brushless alternating-current hybrid excitation brushless direct-current motor |
| CN111629925A (en) * | 2018-01-23 | 2020-09-04 | 王志林 | Motor driving system for electric automobile, machining method, electric automobile and vehicle shell |
| CN110120732A (en) * | 2019-04-23 | 2019-08-13 | 南京航空航天大学 | A kind of induction tandem brushless exciting motor |
| CN113162354A (en) * | 2021-04-30 | 2021-07-23 | 陕西航空电气有限责任公司 | Brushless electric excitation synchronous generator with wide rotating speed range |
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| Publication number | Publication date |
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| CN104104202B (en) | 2017-11-14 |
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