CN2588650Y - Retrofit brushless double-feeding motor - Google Patents

Abstract

The utility model relates to a retrofit brushless double-feeding motor, which comprises a machine shell, a stator, a rotor, and a motor shaft, wherein, two sets of independent coil windings are arranged on a stator iron core, one side end of the rotor is closely connected with an end ring, and the other side end of the rotor is connected according to a 'concentric type' winding structure. The utility model is reformed into a brushless double-feeding motor structure on the basis of a common squirrel cage type asynchronous motor; therefore, the technology is simple and is convenient for application. The retrofit brushless double-feeding motor can realize variable speed running by changing the frequency of a frequency converter and can also change the power factor of the motor by changing the applied voltage of a control winding; therefore, the retrofit brushless double-feeding motor has the properties of a synchronous motor, the use of a low or medium voltage frequency transformers of which the motor power is 1/3-1/4 can be realized, and a brushless double-feeding motor electric driving system can be formed. The variable frequency speed regulation technique can be used in the fields of hydraulic power generation, wind power generation, brushless synchronous motors, some fans, pumps, etc. by the utility model.

Description

The brushless dual-feed motor of remodeling

Technical field

The utility model belongs to machine field, relates to a kind of brushless dual-feed motor that changes the remodeling of common asynchronous moter stator and rotor winding construction form.

Background technology

General common electric machine is the adjustable speed operation under variable frequency power supply control.No matter the variable-ratio operation of motor is as generator (hydroelectric power generation, wind power generation), still can both satisfy working condition requirement, energy savings better, raise the efficiency as motor.But, the frequency converter that mates during the common electric machine speed governing operation must with the sizableness of power of motor, and high-voltage motor also need be equipped with high voltage converter.Therefore, this involves great expense with regard to the electric drive system that causes conventional motors and common frequency converter to be formed, and particularly the occasion of large power high voltage motor work has limited the application of variable-frequency control technique because of input cost is too high.

A kind of hydroelectric power generation unit, wind turbine generator of being widely used in of market demand promptly has the electric machine speed regulation operation function, has the alternating-current brushless double feedback electric engine of synchronous machine character again; Industry more wishes can transform common asynchronous machine by a kind of simple and be easy to disseminate technology, allows converter technique in more field widespread usage.

Chinese patent 02115588.7 discloses a kind of alternating-current brushless double feedback electric engine, from the digest as can be known, it utilizes the characteristics of 3Y parallel connection method commutation variable-pole winding, make the rotor winding conductor obtain recycling, make every effort to replace two cover windings of common double feedback electric engine with a cover winding, reducing motor volume, but that concrete technology contents is not seen is open, does not see application on market as yet.

Summary of the invention

Problem to be solved in the utility model is, overcomes the above-mentioned defective that the technology of taking over exists, and provides a kind of on common cage rotor asynchronous motor basis, changes the brushless dual-feed motor of stator and rotor winding construction form.

The utility model solves its technical problem and takes following technical scheme to realize, the brushless dual-feed motor of a kind of remodeling that provides according to the utility model comprises casing (1), stator (2), rotor (7), motor shaft (8), wherein,

Described stator (2), be provided with two on this stator core (21) and overlap independently coil windings, wherein a cover is power winding (22), three terminals of this winding are connected with electrical network three phase mains (5) respectively, another set of for controlling winding, three terminals of this winding are connected with three outputs of frequency converter (4) respectively;

Described rotor (7), this rotor bar (74) are through rotor core (71), and described rotor one side is connected by end ring (75) sealing, and another side connects by " concentric type " winding (72) structure.

The utility model solves its technical problem and can also take following technical scheme further to realize:

The brushless dual-feed motor of aforesaid remodeling, wherein, described rotor bar (74) can be that the cast aluminium sliver also can be the copper sliver.

The brushless dual-feed motor of aforesaid remodeling, wherein, described stator power winding is placed near bottom land, above stator control winding is placed on; Between this two winding insulating barrier is set;

The brushless dual-feed motor of aforesaid remodeling, wherein, described stator winding form can be that the intersection chain type also can be " concentric type " structure.

The utility model compared with prior art has significant advantage and beneficial effect.By above technical scheme as can be known, the utility model has following advantage at least under the structural arrangements of excellence:

The utility model can common mouse-cage type asynchronous machine be the basis, changes system into a kind of brushless dual-feed motor structure of practicality, and technology simply is easy to apply; This motor not only can change frequency by frequency converter and realize variable-speed operation, can also be by changing the power factor that control winding applied voltage changes motor, make motor have synchronous machine character, can realize using low pressure or the medium voltage frequency converter of power of motor 1/3-1/4, form the brushless dual-feed motor electric drive system; The utility model can be widely used in hydroelectric power generation unit, wind turbine generator, also can be used for the electric machine speed regulation energy-saving run; Can make variable-frequency control technique be widely used in fields such as hydroelectric power generation, wind power generation, brushless synchronous machine, some blower fan, pump class.The utility model contrast prior art has significant contribution and progress, is the good technology with novelty, creativeness, practicality really.

Embodiment of the present utility model is provided in detail by following examples and accompanying drawing thereof.

Description of drawings

Fig. 1 is an overall structure schematic diagram of the present utility model;

Fig. 2 is that the utility model face down bonding connects end ring section construction schematic diagram;

Fig. 3 is that the utility model rotor structure launches schematic diagram;

Fig. 4 is the utility model system wiring schematic diagram.

Embodiment

Below in conjunction with accompanying drawing and preferred embodiment, embodiment, structure, feature and effect thereof that foundation the utility model is provided, describe in detail as after.

Shown in Fig. 1-4, a kind of brushless dual-feed motor of remodeling comprises casing (1), stator (2), rotor (7), motor shaft (8), wherein,

Described stator (2), be provided with two on this stator core (21) and overlap independently coil windings, wherein a cover is power winding (22), three terminals of this winding are connected with electrical network three phase mains (5) respectively, another set of for controlling winding, three terminals of this winding are connected with three outputs of frequency converter (4) respectively; The power winding is placed near bottom land, above the control winding is placed on; Between two windings insulating barrier is set; The stator winding form can be that the intersection chain type also can be " concentric type " structure;

Described rotor (7), this rotor bar (74) is through rotor core (71), described rotor one side is connected by end ring (75) sealing, another side connects by " concentric type " winding (72) structure, Fig. 4 is the welding manner signal of rotor one side ring (76), launches signal referring to Fig. 3 the utility model rotor structure; Described rotor bar (74) can be that the cast aluminium sliver also can be the copper sliver.

The utility model stator is provided with two cover windings, the relation of the coil number of turn is the important structure parameter of this motor between winding, what of each umber of turn and line footpath, except that the operating voltage factor, depend on that also two power division, electromagnetic loads between winding distribute and the velocity interval of machine operation, the design principle of stator two umber of turns described in the utility model is as follows:

Design of electrical motor operating rate scope N _W≤ N _P0The time, E must be arranged _2SP＞E _2SC

Design of electrical motor operating rate scope N _W〉=N _P0The time, E must be arranged _2SC＞E _2SP

Wherein: N _W--brushless dual-feed motor working rotor rotating speed;

N _P0--brushless double-fed acc power winding synchronous speed;

E _2SP--brushless double-fed machine rotor power winding electromotive force;

E _2SC-brushless double-fed machine rotor control winding electromotive force.

Operation principle of the present utility model is: after power winding and control winding are pressed certain program energized, the rotating magnetic field acting in conjunction that two cover windings produce is in special cage rotor winding, rotor winding thereby produce two kinds of magnetic fields main, that be coupled respectively with stator two cover windings, thus two magnetic fields of stator are interacted indirectly.The main frequency (Fc) of regulating the control winding just can be realized the variation of motor speed; Regulate the amplitude of control winding applied voltage, just the power factor of scalable motor.

Motor speed of the present utility model is followed following relation: $N=\frac{\mathrm{Fp}\±\mathrm{Fc}}{\mathrm{Pp}+\mathrm{Pc}}\×60$ Fp, Fc: stator power winding, control winding frequency N: brushless dual-feed motor rotating speed Pp, Pc: identical the getting of direction of rotation in stator two cover winding magnetic fields in power winding, the control winding number of pole-pairs formula+number, direction of rotation gets on the contrary-number.

The above, it only is preferred embodiment of the present utility model, be not that the utility model is done any pro forma restriction, according to different working conditions, available structure setting of the present utility model, adjust the power supply program of two cover windings and the control mode of the mode of connection and frequency converter, it still belongs to the technical solution of the utility model.Every foundation technical spirit of the present utility model all still belongs in the scope of technical solutions of the utility model any simple modification, equivalent variations and modification that above embodiment did.

Claims (2)

1. the brushless dual-feed motor of a remodeling comprises casing (1), stator (2), rotor (7), motor shaft (8), it is characterized in that:

Described stator (2), be provided with two on this stator core (21) and overlap independently coil windings, wherein a cover is power winding (22), three terminals of this winding are connected with electrical network three phase mains (5) respectively, another set of for controlling winding, three terminals of this winding are connected with three outputs of frequency converter (4) respectively;

Described rotor (7), this rotor bar (74) are through rotor core (71), and described rotor one side is connected by end ring (75) sealing, and another side connects by " concentric type " winding (72) structure.

2. the brushless dual-feed motor of remodeling as claimed in claim 1, it is characterized in that: described rotor bar (74) can be that the cast aluminium sliver also can be the copper sliver.

Images