74results about How to "Reduce cogging" patented technology

In a spindle motor, a core (33) includes a plurality of core plates (34), which are laminated one on another. The core (33) is constituted by laminating two cores, that is, a first core (34a) and a second core (34b), which are different from each other in shape of a surface facing to a rotor magnet (32). At least a part of a cogging torque generated at the second core (34b) can be cancelled by a cogging torque generated at the first core (34a).

The invention relates to a structure of a motor stator core and a cooling method for a motor stator based on the structure of the motor stator core. The structure is characterized in that the stator core is formed by splicing and combining stator yoke units and stator tooth units, wherein the quantities of the stator yoke units and the stator tooth units are the same, and are equal to the slot number Z1 of a stator; the stator yoke units and the stator tooth units are formed by laminating oriented silicon steel sheets; a stator yoke unit is connected between every two adjacent tooth units; the tooth units and the stator yoke units are in joggle joint; the silicon steel sheets of the stator yoke units are oriented circumferentially; and the silicon steel sheets of the stator tooth units are oriented radially. The cooling method is selected from one of air cooling, water cooling and oil cooling. The structure has the advantage that the motor has the characteristics of low ferromagnetic loss, high efficiency, low torque pulsation, low slot effect, low running noise, low wind resistance, high slot fullness rate of a stator winding, high utilization ratio of a silicon steel sheet material, suitability of the stator for automatic mass production and the like.

A brushless direct current (BLDC) motor has a 3-phase winding 20 and six stator teeth 14, 15 with alternate stator teeth 14 being wound and the remaining stator teeth 15 being left unwound. The winding 20 has three legs, one for each phase and each leg has one coil 22 wound about one of the stator teeth 14. Each leg has a first end A,B,C, arranged to receive electrical power and a second end X,Y,Z, which is connected to the second end of the other legs to form a star connection 24. Selected stator teeth have grooves in a face thereof dividing those teeth into a plurality of stator poles. The motor may be used to drive a fuel pump for an internal combustion engine, typically for a vehicle.

A rotor for an axial flux permanent magnet machine is described. The machine has a stator comprising a stator housing enclosing a set of coils wound on stator bars or teeth and disposed circumferentially at intervals about an axis on the machine, and a rotor bearing a set of permanent magnets and mounted for rotation about the said axis. The rotor and stator are spaced apart along said axis to define a gap therebetween in which magnet flux in the machine is generally in an axial direction. The magnets are disposed circumferentially around said rotor and define a plurality, n, of matching sets of magnets. Each set of magnets includes a plurality of magnets, wherein said n sets of magnets on said rotor have n-fold rotational symmetry. Within a said set, the magnets have different shapes and/or relative circumferential spacings of adjacent magnets within the set of magnets are irregular.

A servo motor, comprising a stator and a rotor disposed within the stator. The rotor has a core and magnets, covering the periphery of the core, forming a plurality of axially extending rotor poles. The rotor poles comprise a plurality of the magnets arranged axially, and the centers of adjacent magnets of a rotor pole are staggered by a mechanical angle in the circumferential direction of the rotor.

An ironless AC linear motor for generating a thrust such that a carrier can move relative to a stator along a movement axis, includes parallel rows of permanent magnets arranged along the movement axis with a given magnet pitch to form a magnetic gap, a row of ironless coils having through holes and a manifold connected to the cooling tubes for distributing the coolant having a length equal to the magnet pitch in the direction of the movement axis.

The invention belongs to the field of machinery and particularly relates to a stator chute machining tool and a stator chute machining method. The stator chute machining tool comprises a stator iron core piece fixing device and a stator chute forming device. The stator iron core piece fixing device is composed of a base plate, a positioning mandrel and a pressing plate, wherein the positioning mandrel is arranged on the base plate in a screw joint mode, the pressing plate is arranged at the top end of the positioning mandrel in a screw joint mode, and stator iron core pieces are sleeved on the positioning mandrel. The stator chute forming device is composed of a fixing plate, an angle plate and a parallel positioning mandrel, wherein the fixing plate is fixedly arranged on the base plate, the parallel positioning mandrel is arranged in the center of the fixing plate in a rotating mode, a positioning rib which is matched with stator iron core piece grooves is arranged at one end, close to the stator iron core pieces, of the parallel positioning mandrel, and the other end of the parallel positioning mandrel penetrates through the fixing plate to be sleeved with and fix the angle plate. The stator chute machining tool rapidly and efficiently machines stator chutes, inclined angles of the chutes are controlled when a positioning pin is matched with a positioning pin stroke hole, and a stator chute iron core can effectively weaken the effect of teeth and slots of a motor.

The invention discloses a hybrid excitation synchronous generator with low cogging effect, relates to synchronous generators and solves the problems that the traditional generator has the disadvantages of high starting resistance, poor starting performance and poor effect; and the problems that a small hybrid excitation synchronous generator has a thick size of a permanent magnet on a magnetic pole and a high magnetic motive force, which affect the adjustment effect of a voltage. The rotor of a motor of the invention adopts a split-pole structure, wherein a plurality of magnets are arranged on the surface of a pole yoke of the rotor; the polarity of the magnets is the same; the distance between the magnets is kept in a certain proportion; and non-guide magnetic space is arranged between two neighbouring magnets. The hybrid excitation synchronous generator of the invention can weaken or eliminate the cogging effect in the synchronous generator, improves a whole moment coefficient of a stator winding of the generator, reduces the starting resistance and the running noise of the generator, can increase the main magnetic flux of the hybrid excitation synchronous generator when an excitation current is increased, and improves the load characteristic of the generator.

The invention provides a disc type motor rotor with embedded magnetic poles, which comprises a rotor back plate, magnetic poles and surface iron cores, wherein the rotor back plate is in the shape ofa circular ring, the upper surface of the rotor back plate is provided with a plurality of magnetic pole grooves which are formed in a continuous manner, and the longitudinal cross section of each magnetic pole groove in the direction perpendicular to the radial direction of the rotor back plate is bilaterally symmetrical; each magnetic pole groove is fixedly embedded with a magnetic pole, and themagnetic pole is of a groove shape corresponding to the shape of the magnetic pole groove; and the surface iron cores are fixed in the grooves of the magnetic poles, and the surface iron cores are ofa shape corresponding to an accommodating space of the grooves of the magnetic poles. The disc type motor rotor with the embedded magnetic poles is high in inductance and good in magnetoresistive effect, obtains a magnetic field with a better sine degree, improves the torque, and is high in speed and easy to perform field weakening control. In addition, the disc type motor rotor with the embeddedmagnetic poles is low in magnetic field loss and low in cogging effect.

The invention discloses a rotor chip, a rotor and a motor. The rotor chip comprises a disc-shaped chip, wherein the chip is provided with 16 magnetic steel grooves, and every two adjacent magnetic steel grooves form a set of magnetic groove pairs; the two magnetic steel grooves in each group of magnetic groove pairs are arranged in a V shape, and the opening direction faces the outer side of the chip; the eight groups of magnetic groove pairs are symmetrically distributed around the center of the chip; the two magnetic steel grooves in the same group of magnetic groove pairs are symmetricallyarranged relative to the straight line n which passes through the center of a certain chip; the chip is provided with a group of magnetic separation holes in the V-shaped opening side of each group ofmagnetic grooves; the magnetic separation hole group comprises two first magnetic separation holes and two second magnetic separation holes which are symmetrically arranged relative to the straight line n; and the second magnetic separation holes are located in the two sides of the first magnetic separation holes. The distribution of magnetic force lines of the rotor adopting the rotor chip can be effectively improved, so that the tooth groove effect of the motor is weakened, and the purpose of improving the torque fluctuation is achieved; and in addition, the structure of a stator inclined groove and a rotor inclined groove does not need to be arranged, so that the production process is simplified, and the cost is lowered.

The invention discloses an IE5 three-phase asynchronous motor based on stator unequal-groove punching sheets and a cast-aluminum rotor. A rotor core of the motor is formed by laminating a plurality ofrotor punching sheets, each rotor punching sheet comprises an annular first substrate, a plurality of closed grooves are radially and uniformly formed in the outer annular surface of each first substrate along the circumferential direction of the first substrate, and aluminum conducting bars are cast in the closed grooves; a stator core of the motor is formed by laminating a plurality of stator unequal-groove punching sheets. Each stator unequal-slot punching sheet comprises a second substrate in a circular ring shape; stator groove groups used for placing copper wires are uniformly arrangedon the inner circular ring surface of the second substrate along the circumferential direction of the second substrate in a radial manner. The number of the stator slots of each pole and each phase ineach stator slot group is at least three, the stator slots comprise at least one large stator slot and at least two small stator slots, the large stator slot is arranged in the middle of the stator slot group, and the two sides of the large stator slot are respectively provided with one or more small stator slots; or at least one large stator slot, at least two middle stator slots and at least two small stator slots are included; the large stator slot is arranged in the middle of the stator slot group, two sides of the large stator slot are respectively provided with one or more small statorslots, one or more middle stator slots are respectively arranged between the large stator slot and the small stator slots, and concave slot wedges or convex slot wedges are plugged in the stator slotsembedded with the stator windings.

The invention discloses a permanent-magnet disk type wind generator with double chute stators, which comprises a left chute stator, a right chute stator, a permanent-magnet rotor, a hollow output shaft, a first chassis, a second chassis, a middle component and a control unit, wherein the left chute stator and the right chute stator are correspondingly arranged and fixed on the first chassis and the second chassis respectively, the permanent-magnet rotor is fixed on the hollow output shaft and positioned between the left chute stator and the right chute stator, the hollow output shaft is arranged in central through holes of the first chassis and the second chassis, and two ends of the first chassis and the second chassis are connected through the middle component. The permanent-magnet disk type wind generator with the double chute stators has the advantages of simple and compact structure, low cost, simple and convenient assembly, and wide application range.

The present invention provided a drive unit utilizing magnetism which generates high torque and increases torque without enlarging the diameters of a driving magnetic wheel and a driven magnetic wheel. This driving unit, which rotates a shaft b to which a roller is attached by a power transmission mechanism in noncontact making use of magnetic force, transmits power from the driving magnetic wheel 1 to the driven magnetic wheel 2 to which the roller shaft b is attached, by means of two or more transmission systems, and totals the power to rotate the shaft to which the above roller is attached.

The invention relates to an outer rotor permanent magnet motor stator iron core structure and a roll-back method of a stator winding, wherein a stator iron core thereof is a multi-tooth strip structure of an reverse slot, the edges of notches of the air gap sides of adjacent tooth portions of the stator iron core are made into connecting strips which are mutually connected, adjacent stator yoke portions are made into opening gaps, the self-opened stator yoke portions of the winding are rolled reversely on a multi-tooth strip stator tooth portion, the stator yoke portions are closed after being bent to a round stator, and the air gap sides of the stator tooth portion are located in a connecting state to form a closed slot structure. The invention has simple process and scientific and reasonable design, creates a novel stator structure, and reduces the slot effect. All production links of an outer rotor permanent magnet motor can achieve mechanized production, the effects of human factors are effectively eliminated, the production efficiency and the consistency of products are greatly increased, and the production cost is reduced.

Provided is a linear motor capable of reducing cogging.

The linear motor has a field magnet part 5 having a plurality of permanent magnets 21 arranged to form N and S poles alternately; a core 14 having a plurality of salient poles 14a, 14b and 14c arranged facing the field magnet part 5; and a three-phase coil 16 wounded around the salient poles 14a, 14b and 14c of the core 14. At respective sides in the moving direction of an armature having the three-phase coil 16 and the core 14, auxiliary cores 18 of magnetic body are provided to sandwich the armature 10. The distance P1 between a center of each auxiliary core and a center of a center salient pole 14b is set to be substantially ¼×(2N+1)×a magnetic pole pitch between N-N poles of the field magnet part 5 (N: an integer equal to or greater than 1).