JPS5983565A - Permanent magnet type multipolar synchronous motor - Google Patents

Abstract

PURPOSE:To enable to apply a synchronous motor to a large capacity type by winding in a distributed manner on a stator and bonding a permanent magnet to a rotor. CONSTITUTION:3-phase windings 2 are wound on a laminated core having 12 open grooves. A rare earth metal magnet 3 is bonded to the surface of a cylindrical yoke 4 in a rotor and magnetized with 20 poles. The rotor poles opposite to stator teeth 11-22 coincide just with S-poles of stator teeth 14, 20 when the stator teeth 11, 17 coincide with N-poles. Accordingly, the magnetic flux which is introduced from the stator teeth 11, 17 into the stator core is returned from the stator teeth 14, 20 to the rotor, and magnetic flux of four poles are generated at the stator 1. The magnetic flux which passes through the stator 1 is revolved at five times rotational speed of the rotor and operates as 20-pole synchronous motor.

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention is characterized in that a large number of permanent magnets are arranged and fixed on the outer periphery of the rotor, and the stator has a multi-phase distribution winding. The present invention relates to a permanent magnet type multi-pole synchronous motor having a part.

Permanent rare earth magnets are useful because they have a high magnetic flux density, but they are expensive, so it is desirable to reduce the amount of magnets used and to construct a motor that draws out a large amount of magnets.

As a permanent magnet stepping motor, an inductor type synchronous machine using a concentrated winding coil has been reported, but the structure is not suitable for large capacity. Concentrated winding inductors have uneven magnetic field distribution and poor utilization of coil magnetomotive force. Problems with vibration, noise, and torque pulsation are likely to occur.

In this regard, the present invention overcomes the small h of the conventional technology and winds the stator with distributed winding and attaches permanent magnets to the rotor, thereby creating a permanent magnet that can be applied to large capacity (several kilowatts or more). The object is to provide a magnet type multi-pole synchronous motor.

FIG. 1 is a front sectional view of an electric motor illustrating the principle of the invention.

The stator l is a laminated core with the number of grooves/k open grooves, and is a three-phase winding (u
, v, w@)2 are wrapped.

The rotor has a rare earth magnet 3 stuck to the surface of a cylindrical yoke μ, and is magnetized 7' to the J pole.

The stator teeth//~ the two opposing rotor poles are ii.

When 17 matches N, /l/-, co0 exactly matches S. Therefore, the magnetic flux that enters the stator core from // and /7 returns to the rotor from /l/ and 20 to 9, resulting in a magnetic flux for each stator pole. This magnetic flux flows through the rotor (yoke). Hiro and Rare Earth Magneto 3LDtx
, le) rotates 3ao/lo, rotates 36o/, and returns to the original state.

Thus, the magnetic flux through the stator l rotates five times faster than the rotation of the rotor.

Since the winding λ of the stator l is wound with a pitch that interlinks only with the magnetic flux of the μ poles, it works as a synchronous motor with j times the speed (I x j = SO poles. We have given an example of the structure, but when the number of stator grooves is N, = 34, and the winding pitch polarity is P=g, the number of poles of the motor, N, is NP = λx (3A+:, 2) = A, S''-fi or 76 poles.

The number of grooves Q for each pole and each phase is NS/ (
Jll)=Q, and when the number of grooves Q is large, more ampere turns are added to the magnetic pole, and the minute portion of the magnetic flux d
When φ and the minute part of the angle dθ are, the number of poles is large and dφ/d
Since θ becomes large, a thick 11 torque is generated.

FIG. 2 shows the true essence of an undiscovered, bright example.

In the figures, the same reference numerals as in Figure 1 indicate the same parts or Buddhist priest parts.

The rotor is made of a cylindrical piece of steel with thin rare earth magnets 3 pasted and fixed on the surface, which are magnetized at equal pitches in the radial direction VC to form a field with a number of poles NP.

The stator consists of the same laminated core and distributed armature winding used in general-purpose induction machines, and the inner surface facing the rotor has a large number of teeth facing the internal IK. Magnetic material! is fixed on the inside. There are N7 teeth and they are arranged at a minute pitch.

When the number of phases of the stator winding is m and the number of poles is P, N, = λN
By selecting N, , NT, and P so that T:l:P holds, an m-phase N-pole permanent magnet synchronous motor is constructed.
'1. Ru.

In this way, the number of stator teeth N8 in FIG.
In contrast to this embodiment, the number of teeth is set to be NT, which is independent of the number of winding grooves.

-1, since the number of inner magnetic teeth NT>the number of stator grooves Ns,
-N8 is not necessarily required for NT=, where K is an integer.

Therefore, this structure has a very large degree of freedom in selecting the number of teeth NT of the inner magnetic material, and the teeth with the pasting can be processed by chemical corrosion processing, press processing, resin molding of electrolytic iron powder, etc. A machining method that does not require tools is rotation 1).
It has the advantage of lowering manufacturing costs.

Note that this example is NP=2・NT±P 20=　J　X　/, 2-4L A 20-pole 3-phase homologous motor is formed.

FIG. 3 is a perspective view of another embodiment of the present invention.

A movable element consisting of a yoke 10q7 mm with a permanent magnet (rare earth magnet) 103 fixed to the surface facing the stator 10/, and a fixed element i having a large number of teeth ladled on a grinding stone 103 and also arranged.
70.P through which the armature current flows through the oi: electronic winding 70.
The length of the mover in the moving direction is selected to be an integral multiple of the pole pair created by the magnetomotive force of the stator winding 10.2.

A sensor detects the stator winding under the mover and detects armature lightning,
If the flow is controlled to flow only to the detected part, it can be operated as a linear motor with good efficiency and power factor.

According to the present invention, tl has the following effects.

■ Productivity is high because the stator has almost the same structure as a sail electric motor.

■ The structure of a linear motor is almost the same as the stator of a linear induction motor, and its productivity is good.

@Compared to the torque conductor, when the same current is passed, the generated torque can be at least twice as much as Q (number of grooves per pole, per phase).

■ The thickness of the permanent magnet is selected so that it will not be demagnetized by the stator magnetomotive force, but if rare earth magnets are used,
c = ♂000 A/2ry + magnet thickness l This ampere turn AT is AT = (ac)・τp/koko\, τ1 is N of the magnetic pole created by the winding magnetomotive force, 5ffJJ distance (
The magnetic pole pitch, (ac) is the electrical load [A/crn].

(ac)=, 20(7, hT=goo>, 2oox Rico, therefore τp<1rcrn Thus, if the magnetic pole pitch τ, is smaller than 1rcrrI, the magnet thickness is /+1711 when used with an electrical loading of xooA/cm. Good thing, the coercive force H6 of rare earths can be twice as much as this rooo A/cm, and we can still expect this coercive force Hc to improve in the future.

Therefore, the present invention can be expected to further improve myelinity.

■ If the drive frequency is increased, it can also be used as a motor with high output density. It is a low-speed, high-torque electric motor that can produce continuous output torque 3 to q times that of conventional machines.

Suitable for direct drive actuators.

[Brief explanation of drawings]

FIG. 1 is a front sectional view of an electric motor showing the principle of the invention, FIG. 1 is a front sectional view of one embodiment of the invention, and FIG. 3 is a perspective view of another embodiment of the invention. ! ...Stator, C...Winding, 3...Permanent magnet (rare earth grinding stone), Hiroshi...Yoke, j...Magnetic material arranged on the inner surface of the stator, 10/... ...Stator, 10 pieces...
・Winding wire, lO3...Permanent magnet (rare earth magnet), 1
ott...Yoke (mover). Applicant's representative: Inomata

Claims (1)

[Claims] 1. A rotor in which N and S poles of permanent magnets are arranged alternately in the direction of rotation and fixed on the outer circumferential surface, and an armature winding of multiphase distributed winding is wound. A permanent magnet type multipolar synchronous motor, comprising: a stator having teeth made of a magnetic material on the inner circumferential surface facing the rotor; The two-rotor has thin rare earth magnets attached and fixed on the surface of a cylindrical yoke, magnetized at equal pitches in the radial direction to create a field with a number of poles N, and the stator is made of a laminated iron core. A magnetic material having a plurality of teeth is fixed inwardly on the inner surface facing the rotor, and the teeth are made of NTa and are arranged at equal pitches, and the stator winding The permanent magnet type multi-pole synchronous motor according to claim 1, wherein when the number of phases is m and the number of poles is P, NP= , 2 N, ±P.