CN200947571Y - Multiple rating speed brushless DC electric motor - Google Patents

Abstract

A multi-rated rotation speed brushless direct current motor that can change the rated rotation speed according to the requirements, wherein, the utility model includes a motor spindle, the motor spindle is provided with a left deep groove ball rolling bearing, a wheel-hub rotor housing, a wheel-hub ending cover and a right deep groove ball rolling bearing, the inner wall of the wheel-hub rotor housing is provided with a permanent magnet, the motor spindle in the wheel-hub rotor housing is fixedly connected with a stator core, the stator core is provided with a groove, the groove is winded with coil windings inside, the coil windings are provided with circle edges inside, the coil windings in the groove are divided into an upper and a lower layers, each layer of the coil windings are embedded with a plurality of circle edges paratactically, the paratactic circle edges of the same layer control the circuit through the power switch MOS pipe and connecting the transfer switch to the coil windings. The utility model can not only achieve the multi-rated rotation speed transformation of the brushless direct current motor, but can also meet the requirements of the high-rated rotation speed and achieve the function of increasing the torque of the low-rated rotation speed.

Description

Many rated speeds brushless DC motor

Technical field

The utility model relates to a kind of motor, relates in particular to a kind of many rated speeds brushless DC motor.

Background technology

The patent No. has been CN88103213.1, denomination of invention for the patent disclosure of " a kind of multi-phase bipolar brushless DC motor " a kind of brushless DC motor, the permanent magnet that replaces the field coil winding in the multi-phase bipolar brushless DC motor makes rotor, and armature is used as stator.As independent winding, the commutation encoder is installed on the rotor rotated axle winding technique on stator, and transducer is connected near the commutation encoder and with drive circuit.Its claim is for " a kind of multi-phase bipolar brushless DC motor comprises a voltage regulator; and a plurality of phases; every have the Sensor section of being made up of commutation encoder and phototriode mutually; a magnetizing coil winding and an electronic commutator; their common a plurality of phases of isolation mutually of forming; each is all in parallel with a voltage regulator mutually, every have two phototriodes mutually, set the excitatory width that requires with respect to the encoder that commutates and reached and the corresponding sense of current of rotor direction of rotation, in the magnetizing coil winding, can flow through the bipolarity electric current thus and can start reposefully and driving to allow described brushless DC motor.”

The patent No. is CN02221238.8, the utility model name be called " two power permanent-magnet direct-current machine with printed windings " patent disclosure a kind of pair of power permanent-magnet direct-current machine with printed windings, motor shaft (1) is installed on the armature pallet II (15), three bearings (2) are with placing on the motor shaft (1), front end housing (4) is installed on the bearing (2), front end housing (4) and rear end cap (17) mutually combine, in front and rear cover, magnetic conduction iron hoop (5) is fixed on the front end housing (4), magnetic conduction iron hoop (13) is fixed on the rear end cap (17), magnet I (6) is contained on the magnetic conduction iron hoop (5), magnet II (12) is contained on the magnetic conduction iron hoop (13), armature I (7) is bonded on the armature pallet I (140), armature II (11) is bonded on the armature pallet II (15), magnetic conduction iron (8) (10) is contained on the rear end cap (17), is provided with two 180 watts and prints armature rotor in an electric machine casing, and two armatures place on the same output shaft, independent separately between the armature, two armatures are controlled with ratchet.Its claim is " 1. 1 kinds of two power permanent-magnet direct-current machine with printed windings of claims; by front and rear cover; magnetic conduction iron hoop; magnet; armature; the armature pallet, clutch and brush are formed, it is characterized in that: motor shaft (1) is installed on the armature pallet II (15), three bearings (2) are with placing on the motor shaft (1), front end housing (4) is installed on the bearing (2), front end housing (4) and rear end cap (17) mutually combine, in front and rear cover, magnetic conduction iron hoop (5) is fixed on the front end housing (4), magnetic conduction iron hoop (13) is fixed on the rear end cap (17), magnet I (6) is contained on the magnetic conduction iron hoop (5), magnet II (12) is contained on the magnetic conduction iron hoop (13), armature I (7) is bonded on the armature pallet I (14), armature II (11) is bonded on the armature pallet II (15), magnetic conduction iron hoop (8) (10) is contained on the rear end cap (17), between magnetic conduction iron hoop (8) (10), place every magnetosphere (9), clutch (16) internals (24) are connected with armature pallet II (15), clutch housing (19) is press-fitted with armature pallet I (14), and clutch (16) internals (24) are controlled with ratchet with outer cover (19).”

The patent No. has been CN91100856.X, denomination of invention for the patent disclosure of " differential variable-pole motor " a kind of brushless DC motor, the magnetic pole of differential variable-pole motor (the quite stator of motor) is equipped with bearing and connects with an eccentric disc with controller of auto-lock function, one people's buncher control of self-lock controller, make the magnetic pole rotating speed rotation on demand of change pole motor, its direction of rotation is opposite with the direction of rotation of the rotor of motor.Its claim is " a differential variable-pole motor; by magnetic pole three-phase alternating-current motor with bearing floating; have the eccentricity control mechanism of auto-lock function; low-power continuous variable transmission; and the differential synthetic constant speed train of a cover is formed; it is characterized in that with eccentric disc 5 connections by the eccentricity control mechanism with auto-lock function of the motor poles 1 (stator) of bearing floating, and be subjected to it from lock control, can not rotate the eccentric pivoted arm 8 of input component of self-locking mechanism is arbitrarily controlled by the magnetic pole 10 of low-power continuous variable transmission, the big I of the exciting curent by regulating speed changer makes infinitely variable speeds do infinitely variable speeds output, by self-locking mechanism motor magnetic pole is rotated by desired rotating speed, make motor magnetic pole and rotor produce a relative motion (differential) thus changed the actual number of pole-pairs P of motor, because the change of the number of pole-pairs P of motor is infinite variable speed, so realized the constant-power stepless speed change of motor.”

The small-sized extraordinary DC motor that a kind of and sharp DC motor characteristic that the patent No. has been CN90103697.8, denomination of invention for the patent disclosure of " double-characteristic motor specified for electric vehicle " and DC series motor characteristic have both, its key technology can be converted to and sharp formula or series excitation type according to the needs of load variations in service at any time in the design of field winding.Its claim is " method for designing of a kind of double-characteristic motor specified for electric vehicle (being called for short two special motors); be included on the existing DC motor technical foundation; to the design and the calculating of field winding, realize the main points of rating data and performance index, and the selection of specified magnetic flux point.The field winding of existing DC motor has and two kinds of sharp formula and series excitation types basically, and domestic animal of the present invention to be field winding can be converted to and sharp formula or series excitation type at any time according to the needs of load variations in service.For this reason, the design of field winding is should be equivalent according to excitatory clean number of ampere turns before and after also swashing conversion, calculates the number of turn that original shunt winding is divided into every section coil windings in the plurality of sections; Again according to armature supply to and the multiple of exciting curent when swashing, calculates above-mentioned by five equilibrium all section and uses the way of propping up that the series excitation winding should be in parallel as.”

The patent No. has been CN91106981.X, denomination of invention for the patent disclosure of " normal timing type AC-DC speed-regulating motor " a kind of timing AC-DC speed-regulating motor adopts electromagnet principle and the timing principle of switching in proper order to make.Coil windings is arranged on the magnetic pole of the stator, and rotor does not have the coil winding.Its claim be " a kind of normal timing type AC-DC speed-regulating motor; form; it is characterized in that being equipped with on the machine shaft timing device of synchronous rotation by stator, rotor, rotating shaft, shell; the timing device by conducting slip ring, timing conducting device, often touch conducting device, axle sleeve is formed; conducting slip ring and shaft room are embedded with the high-temperature resistant insulator, and the axle sleeve of timing device is sleeved on the shaft of motor.”

Above-described brushless DC motor all has only a rated speed, and rated speed is low, no high-speed working condition; Rated speed is high, and its low-speed characteristic is poor, does not possess the function of low-speed big, any rated speed that all can not change motor as required.

Summary of the invention

The purpose of this utility model provides a kind of many rated speeds brushless DC motor that can change rated speed as required.

For achieving the above object, the technical solution adopted in the utility model is:

A kind of many rated speeds brushless DC motor, comprising electric machine main shaft, left zanjon ball rolling bearing is installed on the electric machine main shaft, the hub-type rotor case, the hub-type rotor endcap, right zanjon ball rolling bearing, on the hub-type rotor case inwall permanent magnet is installed, be fixedly connected with stator core on the electric machine main shaft in the hub-type rotor case, stator core has groove, be wound with coil windings in the groove, coil windings is comprising the circle limit, its characteristics are: the coil windings in the groove is divided into, two-layer down, every layer line circle winding has embedded a plurality of circles limit side by side, passes through the power switch metal-oxide-semiconductor with the circle arranged side by side limit of layer, change over switch is connected to the coil windings control circuit.

The utility model increases to a plurality of circles limit to a circle limit of original motor, and to carry out series, parallel or connection in series-parallel combination with layer circle limit arranged side by side, can make the rated speed of motor have different values, realize many rated speeds conversion of brushless DC motor, can satisfy the needs of high rated speed, can realize that again low rated speed increases the function of moment of torsion.

Description of drawings

Fig. 1 is a structural representation of the present utility model;

Fig. 2 is the A-A cutaway view of Fig. 1;

Fig. 3 is the structural representation of coil windings, stator core, spline housing in the utility model;

Fig. 4 is the structural representation of hub-type rotor case, permanent magnet in the utility model;

Fig. 5 is the left view of Fig. 4;

Fig. 6 is the structural representation of hub-type rotor endcap in the utility model;

Fig. 7 is the left view of Fig. 6;

Fig. 8 is the structural representation of electric machine main shaft in the utility model;

Fig. 9 is the vertical view of Fig. 8;

Figure 10 is the structural representation of spline housing in the utility model;

Figure 11 is the left view of Figure 10;

Figure 12 is coil windings control circuit figure of the present utility model.

In the accompanying drawing: 1, hub-type rotor case; 2, hub-type rotor endcap; 3, permanent magnet; 4, coil windings; 5, stator core; 6, left zanjon ball rolling bearing; 7, spline housing; 8, key; 9, right zanjon ball rolling bearing; 10, pin; 11, electric machine main shaft; 12, change over switch; 13, resistance; 14, power switch metal-oxide-semiconductor.

Embodiment

Below in conjunction with the drawings and specific embodiments the utility model is further described:

A kind of many rated speeds brushless DC motor, as Fig. 1, shown in Figure 2, comprising electric machine main shaft 11 (referring to Fig. 8, Fig. 9), left zanjon ball rolling bearing 6 is installed on the electric machine main shaft 11, hub-type rotor case 1 is (referring to Fig. 4, Fig. 5), hub-type rotor endcap 2 is (referring to Fig. 6, Fig. 7), right zanjon ball rolling bearing 9, on hub-type rotor case 1 inwall permanent magnet 3 is installed, be fixedly connected with stator core 5 (referring to Fig. 3) on the electric machine main shaft 11 in the hub-type rotor case 1, stator core 5 has groove, be wound with coil windings 4 in the groove, coil windings 4 is comprising the circle limit, coil windings 4 in the groove is divided into, two-layer down, every layer line circle winding 4 has embedded a plurality of circles limit side by side, passes through power switch metal-oxide-semiconductor 14 with the circle arranged side by side limit of layer, change over switch 12 is connected to coil windings control circuit (referring to Figure 12).

The utility model can be applicable to motor vehicles such as electric bicycle, electro-tricycle, is specially adapted to electric automobile.

The utility model is on the basis of existing brushless DC motor, according to its structure and manufacturing process, an original circle limit is divided into a plurality of circles limit, and, makes motor realize many rated speeds carry out series, parallel or connection in series-parallel mixing with the circle arranged side by side limit of layer.

The utility model comprises: hub-type rotor, connecting bolt, spring washer and nut, permanent magnet, stator, electric machine main shaft, coil windings control circuit, stator wherein comprise spline housing, stator core and coil windings again.Left zanjon ball rolling bearing and right zanjon ball rolling bearing have been installed on the electric machine main shaft, between these two bearings, spline housing has been installed, the circular silicon steel sheet group of forming stator core has been housed on the spline housing, on the silicon steel sheet group, had groove by key, coil windings is installed in the groove, thereby forms stator; On left side zanjon ball rolling bearing and the right zanjon ball rolling bearing hub-type rotor case and hub-type rotor endcap have been installed respectively, in the hub-type rotor case permanent magnet have been installed, thereby formed the hub-type rotor; Coil windings adopts Y-connection, and the head and the tail of each coil windings all have lead-out wire, draw by the hole on the electric machine main shaft, link to each other with controller and coil windings control circuit respectively.Coil windings is a two layer winding, and each has embedded several circles limit to each groove side by side with lower floor at the middle and upper levels, has formed empty groove; Circle arranged side by side limit with layer can parallel connection, series connection, connection in series-parallel mix and use, and also can use separately or the use of circle segment limit series and parallel on single circle limit.Each connected mode of enclosing the limit is to finish series and parallel and use through coil windings control circuit, the connection of contactless change over switch.

In the utility model, the double-layer coil winding in each groove, the upper and lower can each embed four circle limits side by side, and promptly every layer has 4 circle limits, forms 4 empty grooves.

In the utility model, the double-layer coil winding in each groove, the upper and lower can also each embed three circle limits side by side, and promptly every layer has 3 circle limits, forms 3 empty grooves.

In the utility model, the double-layer coil winding in each groove, the upper and lower can also each embed two circle limits side by side, and promptly every layer has 2 circle limits, forms 2 empty grooves.

In the utility model, the double-layer coil winding in each groove, each coil windings has three centre taps, and four rated speeds can be arranged.

In the utility model, the double-layer coil winding in each groove, each coil windings has two centre taps, and three rated speeds can be arranged.

In the utility model, the double-layer coil winding in each groove, each coil windings has a centre tap, and two rated speeds can be arranged.

In the utility model, every layer of circle limit that embeds side by side can mark first circle limit and tail circle limit, and the tail circle limit of each phase connects into star or triangle connects, and each phase power supply is linked on the first circle limit of each phase respectively.The head and the tail of each coil windings all have lead-out wire, receive the corresponding output end of coil windings control circuit respectively, connect under the control of control circuit or control signal by contactless change over switch and finish the series and parallel use.

In the utility model, every layer of circle limit that embeds side by side, when all series connection was used, motor was operated under the low rated speed mode, exports low rotating speed, big moment of torsion; Every layer of circle limit that embeds side by side, during all in parallel the use, motor is operated under the high rated speed mode, exports high rotating speed, low moment of torsion; Every layer of circle limit that embeds side by side takes series and parallel to mix when using, and motor is operated under the conventional rated speed mode, the moment of torsion that output is conventional.

In the utility model, every layer of circle limit that embeds side by side can be operated in that the single coil winding independently uses and coil sections winding series and parallel uses, to reach different rated speed and corresponding output torques.

The utility model is under the structure and manufacturing process of existing brushless DC motor, a circle limit is divided into a plurality of circles limit, and to carrying out series and parallel with the circle arranged side by side limit of layer, realizes many rated speeds.

In the utility model, every layer of circle limit that embeds side by side, take series and parallel to mix when using, motor is operated under the conventional rated speed mode, and its output speed, power output and output torque are labeled as conventional rated speed, conventional rated power and conventional nominal torque.

In the utility model, every layer of circle limit that embeds side by side, when all series connection was used, motor was operated under the low rated speed mode, exported low rotating speed, exported big moment of torsion, and operating current is little, power is little.When being used for electric automobile, make the low rate start of electric automobile and grade climbing performance good.

In the utility model, every layer of circle limit that embeds side by side, during all in parallel the use, motor is operated under the high rated speed mode, exports high rotating speed, the low moment of torsion of output, and big electric current is high-power.

In the utility model,, motor is being operated near under the permanent power operating mode under the different rated speeds when the high-quality enamelled wire of selecting low resistance for use.

In the utility model, the control of coil windings series and parallel is to realize under the control of coil windings control circuit.What the contactless change over switch in the coil windings control circuit was selected for use is powerful power switch metal-oxide-semiconductor, and the control circuit of power switch metal-oxide-semiconductor can be control automatically, also can be manually operated.When having adopted automatic control mode, can make machine operation all is under the operating mode of the best in efficient and effect.

Design principle of the present utility model is as follows:

Existing brushless DC motor has only a rated speed, low rated speed, because its rotating speed is low, no high-speed working condition; High rated speed, its low-speed characteristic is poor, does not have the function of low-speed big.The utility model is under the structure and manufacturing process of existing brushless DC motor, and a circle limit is divided into a plurality of circles limit, and to carry out the series and parallel combination with the circle arranged side by side limit of layer, realizes many rated speeds, realizes that low speed increases the function of turning round.

Existing brushless DC motor, coil windings on its stator core is a two layer winding, and a coil windings has two circle limits, and is in respectively under the different pole-faces, be placed in the groove of stator core, one in the position, upper strata of groove, and another has upper and lower two circle limits in the lower floor position of groove on each groove, there is N circle line on each circle limit, every circle has the F strand, thus each total NF strand in circle limit, total 2NF strand in each groove; The resistance value of each coil windings is R.The utility model is taked is that upper strata, lower floor at each groove embeds C circle limit respectively side by side, in season during C=3, this situation is exactly 3 empty grooves, promptly getting circle limit, upper strata, to enclose the limit with a lower floor be an empty groove, like this, empty groove is counted Ze, real groove is counted Z and enclosed the pass of counting between the C on the limit side by side and is:

Ze＝CZ

The coil windings of motor is counted S and is just equaled empty groove and count Ze, promptly

S＝Ze

If each coil windings has Ne circle line, every circle has the Fe strand, and the total conductor of armature is counted N and is

N＝2CNeZ＝2NeZe

If each parameter of existing brushless DC motor is respectively: coil windings is counted S, real groove is counted effective length L, the magnetic induction density B of permanent magnet, rotor linear velocity v, pivot radius r, the angular velocity omega of rotor, motor speed (r/min) n of Z, every circle number of share of stock F, number of turn N, resistance value R, torque T, induced electromotive force E, coil windings, and the coil windings of each layer is X with Xn respectively on the stator core ₁, X ₂, X ₃Represent that like this, it is A that A then is expressed as An mutually ₁, A ₂, A ₃In like manner can get the expression of B phase, C phase.If each parameter of the present utility model is respectively Sen, Zen, Fen,, Nen, Cn, Ren, Tn, En, Ln, B, vn, r, ω n, nn.X ₁Number of share of stock be F ₁, resistance is

The number of turn is N ₁, X ₂Number of share of stock be F ₂, resistance is

The number of turn is N ₂, X ₃Number of share of stock be F ₃, resistance is

The number of turn is N ₃N ₂＝N ₃，F ₂+F ₃＞F ₁＞F ₂＝F ₃。

Then have:

E＝vBLZ， $\mathrm{\ω}=\frac{2\mathrm{\π}}{60}n,$ v＝ωr，E＝ωrBLZ

T=rBLIZ, wherein I is the electric current of coil windings.

The balance of voltage equation of motor is:

U-ΔU＝E+IR

U-ΔU＝ωrBLZ+IR ∴ $\mathrm{\ω}=\frac{U-\mathrm{\ΔU}-\mathrm{IR}}{\mathrm{rBLZ}},$ $\frac{2\mathrm{\π}}{60}n=\frac{U-\mathrm{\ΔU}-\mathrm{IR}}{\mathrm{rBLZ}}$

∴ $n=\frac{60(U-\mathrm{\ΔU}-\mathrm{IR})}{2\mathrm{\πrBLZ}}$

Wherein Δ U is the voltage drop of switch etc.

Stator winding of the present utility model is A, B, C three phase windings, substitutes X with A, B, C respectively and represents each winding.

When each coil windings parallel connection of X, the utility model is operated under the high rated speed, establishes each parameter of the present utility model and is respectively Se ₁, Ze ₁, Fe ₁, Ne ₁, C ₁=1, and order:

Ze ₁＝C ₁Z＝Z；F＝Fe ₁＝F ₁+F ₂+F ₃＝F ₁+2F ₂；Ne ₁＝min(N ₁，N ₂，N ₃)；Se ₁＝C ₁S＝S；Re ₁＝C ₁R＝R

E ₁＝vBLZ， v＝ωr， E1＝ωrBLZ，

T ₁＝rBLIZ， T ₁＝T

$n_1=\frac{60(U-\mathrm{\ΔU}-\mathrm{IR})}{2\mathrm{\πrBLZ}},$ n ₁＝n

When each coil windings series connection of X, the utility model is operated under the low rated speed, establishes each parameter of the present utility model and is respectively Se ₃, Ze ₃, Fe ₃, Ne ₃, C ₃=3, then:

Ze ₃＝C ₃Ze ₁＝3Ze ₁；Fe ₃＝min(F ₁，F ₂，F ₃)＝F ₂＝F ₃；Ne ₃＝N ₁+N ₂+N ₃；Se ₃＝C ₃Se ₁＝3Se ₁； ${\mathrm{Re}}_3=\frac{F}{F1}R+\frac{F}{F2}R+\frac{F}{F3}R.$

E ₃＝v ₃BL ₃Z ₃＝3v ₃BLZ，

v ₃＝ω ₃r

E ₃＝ω ₃rBL ₃Z ₃＝3ω ₃rBL ₃Z，

T ₃=rBL _E3I _E3Z _E3=3rBLZI _E3, work as I=Ie ₃The time, T is then arranged ₃=3T

$n_{e3}=\frac{60(U-\mathrm{\&Delta;U}-I_{e3}{R}_{e3})}{2\mathrm{\&pi;rB}{L}_{e3}{\mathrm{<figure-callout\; id="3"\; label="Z\; e"\; filenames="Y20062000962500131.png,Y20062000962500141.png"\; state="\{\{state\}\}">Z</figure-callout>}}_e}=\frac{1}{3}\&CenterDot;\frac{60(U-\mathrm{\&Delta;U}-I_{e3}{R}_{e3})}{2\mathrm{\&pi;rBLZ}}$

Work as I=Ie ₃The time, R ≈ Re ₃, then have $n_{e3}\&ap;\frac{1}{3}n$

As coil windings X ₂, X ₃Parallel connection is again with X ₁Windings in series, the utility model are operated under the conventional rated speed, establish each parameter of the present utility model and are respectively Se ₂, Ze ₂, Fe ₂, Ne ₂, C ₂=2, then:

Ze ₂＝C ₂Ze ₁＝2Ze ₁；Fe ₁＝min(F ₁，(F ₂+F ₃))＝F ₁；Ne ₂＝N ₁+N ₂＝N ₁+N ₃；Se ₂＝C ₂Se ₁＝2Se ₁； ${\mathrm{Re}}_2=\frac{F}{F1}R+\frac{\mathrm{<figure-callout\; id="2"\; label="F\; F"\; filenames="Y20062000962500151.png"\; state="\{\{state\}\}">F</figure-callout>}}{F}R.$

T ₂=rBL _E2I _E2Z _E2=2rBLZI _E2, work as I=Ie ₂The time, T is then arranged ₂=2T

$n_{e3}=\frac{60(U-\mathrm{\&Delta;U}-I_{e2}{R}_{e2})}{2\mathrm{\&pi;rB}{L}_{e2}{\mathrm{<figure-callout\; id="2"\; label="Z\; e"\; filenames="Y20062000962500151.png"\; state="\{\{state\}\}">Z</figure-callout>}}_e}=\frac{1}{2}\&CenterDot;\frac{60(U-\mathrm{\&Delta;U}-I_{e2}{R}_{e2})}{2\mathrm{\&pi;rBLZ}}$

Work as I=Ie ₂The time, R ≈ Re ₂, then have $n_{e2}\&ap;\frac{1}{2}n$

2, technical characterictic of the present utility model:

(1) conversion rated speed: the utility model is the relation of series and parallel by the connected mode of adjusting coil windings, realizes the function of conversion rated speed.

When each coil windings of every phase was all in parallel, the utility model was operated under the high rated speed, promptly

n ₁＝n

When second in each coil windings of every phase connected with first coil windings with the parallel connection of tertiary coil winding again, the utility model was operated under the conventional rated speed, promptly

$n_{e2}\&ap;\frac{1}{2}n$

When each coil windings of every phase was all connected, the utility model was operated under the low rated speed, promptly

$n_{e3}\&ap;\frac{1}{3}n$

(2) permanent torque, small-power: the utility model is the relation of series and parallel by the connected mode of adjusting coil windings, realizes the function of permanent torque, little electric current, finishes low power characteristic.

Torque and the power output situation of following surface analysis when rotating speed is constant.

When each coil windings of every phase was all in parallel, the utility model was operated under the high rated speed,

Work as T ₁During=T, I ₁=I is power P then ₀₁=P ₀

When second in each coil windings of every phase connected with first coil windings with the parallel connection of tertiary coil winding again, the utility model was operated under the conventional rated speed, promptly $n_{e2}\&ap;\frac{1}{2}n.$

Work as T ₂During=T, by T ₂=2rBLZI _E2, can get $I_2=\frac{1}{2}I$ Then $P_{02}=\frac{1}{2}{P}_0,$ Be power reduction half.

When each coil windings of every phase was all connected, the utility model was operated under the low rated speed, promptly $n_{e3}\&ap;\frac{1}{3}n.$

Work as T ₃During=T, by T ₃=3rBLZI _E3, can get $I_3=\frac{1}{3}I$ Then $P_{03}=\frac{1}{3}{P}_0,$ It has been power reduction

$\frac{2}{3}.$

(3) accurate permanent power, big torque: the utility model is the relation of series and parallel by the connected mode of adjusting coil windings, realizes the function of accurate permanent power, big torque.

Following surface analysis when the permanent power of standard torque and the situation of rotating speed.

When each coil windings of every phase was all in parallel, the utility model was operated under the high rated speed, i.e. n ₁=n.

Work as P ₀₁=P ₀The time, then export torque: T ₁=T.

When second in each coil windings of every phase connected with first coil windings with the parallel connection of tertiary coil winding again, the utility model was operated under the conventional rated speed, promptly $n_{e2}\&ap;\frac{1}{2}n.$

Work as P ₀₂≈ P ₀The time, then export torque: T ₂≈ 2T

When each coil windings of every phase was all connected, the utility model was operated under the low rated speed, promptly $n_{e3}=\frac{1}{2}n$

Work as P ₀₃≈ P ₀The time, then export torque: T ₃≈ 3T.

Claims (2)

1, a kind of many rated speeds brushless DC motor, comprising electric machine main shaft (11), left zanjon ball rolling bearing (6) is installed on the electric machine main shaft (11), hub-type rotor case (1), hub-type rotor endcap (2), right zanjon ball rolling bearing (9), on hub-type rotor case (1) inwall permanent magnet (3) is installed, be fixedly connected with stator core (5) on the electric machine main shaft (11) in the hub-type rotor case (1), stator core (5) has groove, be wound with coil windings (4) in the groove, coil windings (4) is comprising the circle limit, it is characterized in that: the coil windings (4) in the groove is divided into, two-layer down, every layer line circle winding (4) has embedded a plurality of circles limit side by side, passes through power switch metal-oxide-semiconductor (14) with the circle arranged side by side limit of layer, change over switch (12) is connected to the coil windings control circuit.

2, many rated speeds brushless DC motor according to claim 1 is characterized in that: the every layer line circle winding (4) in the described groove has embedded two side by side, three or more encloses the limit.

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