WO2012160600A1

WO2012160600A1 - Stator coreless reciprocating transverse flux machine

Info

Publication number: WO2012160600A1
Application number: PCT/JP2011/002888
Authority: WO
Inventors: Shouichi Tanaka
Original assignee: Three Eye Co., Ltd.
Priority date: 2011-05-24
Filing date: 2011-05-24
Publication date: 2012-11-29

Abstract

An object of the invention is to provide a compact stator-coreless reciprocating transverse flux machine (SCR-TFM). The two mover cores move to opposite directions to each other. A stator winding of which both coil end portions are fixed to a housing. A thrust force of the SCR-TFM becomes double in comparison with a conventional TFM having a mover core and a stator core.

Description

STATOR CORELESS RECIPROCATING TRANSVERSE FLUX MACHINE

Cross-Reference to related application

This application claims benefit under 35 U.S.C.119 of PCT/JP2011/000669 filed on Feb/07/2011, the title of TRANSVERSE FLUX MACHINE of which the entire content is incorporated herein reference.

Background of Invention

1. Field of the Invention
The present invention relates to a stator-coreless reciprocating transverse flux machine (SCR-TFM), more particularly to the SCR-TFM having two mover cores reciprocating to opposite direction to each other. The machine is provided for converting between a reciprocating thrust force and an electric power.

2. Description of the Related Art
A transverse flux machine (TFM) with a high power/weight ratio has two types includes a rotating TFM and a linear TFM. The linear TFM includes a reciprocating transverse flux machine, of which a mover is reciprocated within a short stroke. A linear internal combustion engine (LICE), a linear pump (LP) and a linear compressor (LC) enable to employ the R-TFM. Many patents are published on the reciprocating TFM technology.

In known TFM technologies, single-sided structure and double-sided (dual-sided) structure are known. The double-sided structure reduces a vertical force between a stator core and a mover core. The TFM is a single-phase electric machine including a single-phase motor, a single-phase generator and a single-phase motor-generator. A stator winding wound on the stator core is extended to a longitudinal direction (moving direction of a rotor or the mover) of the TFM. The linear TFM can employ a permanent magnet flux, a field current flux and a variable reluctance in order to generate a thrust force. Generally, a plurality of the single-phase TFMs having a different phase to each other is arranged in tandem in order to reducing ripples.

Generally, a stator core and a mover core of a linear TFM are made from SMC (soft magnetic composites) in order to flow a magnet flux to a width direction of the linear TFM, because it is difficult to form a three-dimensional magnetic configuration with laminated steel plates. The stator core and the mover core are adjacent across a small gap in a height direction. However, robustness and magnetic characteristics of the SMC core are not enough in comparison with the laminated core. United Patent No. 7,339,290 proposes one example of the linear TFM employing the SMC core.

The above free piston machine employing the reciprocating TFM has a simple configuration and a high power/weight ratio, because the free piston is connected directly to the mover. U. S. Patent Unexamined Publication No. 2010/0187031 proposes a reciprocating ICE for a range extender hybrid vehicle. However, the above free-piston machines are not popular in comparison with a piston machine connected to an electric rotating machine. A major reason is that the reciprocating TFM connected to the free-piston machines becomes large and heavy.

It is known that a weight and a size of the reciprocating TFM are reduced by increasing the stator poles. However, a leakage inductance is increased and a power factor is decreased by increasing the stator poles. After all, the reciprocating machine with a TFM is not popular yet in present industries.

United Patent No. 7,339,290 U. S. Patent Unexamined Publication No. 2010/0187031

An object of the invention is to save a weight and a size of a stator-coreless reciprocating transverse flux machine (SCR-TFM) having two mover cores reciprocating to opposite directions to each other. Another object of the invention is to provide a compact free-piston machine.

As for an aspect of the invention, the SCR-TFM has a feature that a stator core of a conventional linear TFM is moved toward an opposite direction to a moving direction of a mover of the conventional linear TFM. A stator winding of the SCR-TFM accommodated in a slot of the mover core is supported to a housing is not reciprocated. In the other words, one of the mover cores consists of the conventional stator core moved to the longitudinal direction. Furthermore, the SCR-TFM of the invention becomes compact, because the SCR-TFM does not need stator cores.

Accordingly, an induced voltage of the stator winding is increased, because a relative changing speed of the magnetic flux is proportional to a sum of absolute speed values of the two mover cores. The induced voltage becomes double, when the two mover cores move to opposite moving directions with an equal speed value each. A power of the SCR-TFM becomes about four times, because the power is proportional to a square value of the induced voltage. Similarly, a generated thrust force of the SCR-TFM is increased largely, too.

It is another important feature that a longitudinal length of the stator winding is longer than a longitudinal length of both mover cores in order to admit the reciprocating of the two movers. Accordingly, the two mover cores are capable of reciprocating in the longitudinal direction without attaching the stator winding. After all, power and thrust force of the SCR-TFM are increased largely.

According to a proffered embodiment, both mover cores have the left teeth, the right teeth and the yoke each. Accordingly, a cross-section of the stator winding is enlarged, because total cross-section of a slot between left teeth and the right teeth of both mover cores is enlarged.

According to another proffered embodiment, a pair of coil end portions of the stator winding is supported to housing. Accordingly, the stator winding, of which a slot portion is accommodated in the slot of the mover core, is supported safely by the housing.

According to another proffered embodiment, the slot portion of the stator winding is fixed to the housing via a non-magnetic supporting member extended to the longitudinal direction. Accordingly, vibration of the stator winding is suppressed. An induced secondary current is suppressed.

According to another proffered embodiment, the slot portion of the stator winding is accommodated in a non-magnetic case extended to the longitudinal direction and fixed to the housing. Accordingly, vibration of the stator winding is suppressed. An induced secondary current is suppressed.

According to another proffered embodiment, the mover core includes bent soft steel plates laminated to a width direction. The left teeth and the right teeth of the mover core have diagonal portions and pole portions. The diagonal portion extending diagonally connects the yoke portion to the pole portion. Accordingly, the mover core can be constructed with easy production process.

According to another proffered embodiment, a soft magnetic sheet is inserted into a gap between adjacent two yoke portions or adjacent two pole portions of the soft steel plates. Accordingly, an iron loss and vibration of the laminated steel plates are decreased.

According to another proffered embodiment, the SCR-TFM is provided to construct a free-piston machine, for example free-piston internal combustion engine or a free-piston pump or a free-piston compressor. Accordingly, a weight and size of the free-piston machine are reduced largely.

Figure 1 is a schematic side view of the SCR-TFM of variable reluctance type. Figure 2 is a schematic side view of a reference TFM having an equal capability to the SCR-TFM of variable reluctance type shown in Figure 1. Figure 3 is a side view showing a detailed central portion of the SCR-TFM shown in Figure 1. Figure 4 is a cross-section (X-X) of the SCR-TFM shown in Figure 3. Figure 5 is a plain view of the SCR-TFM shown in Figures 3 and 4. Figure 6 is a schematic cross-section of a free-piton internal combustion engine having a pair of cylinder blocks 10A and 10B. Figure 7 is a schematic side view showing another position of mover cores of the SCR-TFM shown in Figures 3. Figure 8 is a detailed cross-section of showing the SCR-TFM showing in Figures 3-5. Figure 9 is a schematic elevation view of two of the laminated soft steel plates, which are a part of mover core. Figure 10 is a schematic cross-section showing a case accommodating a stator winding of the SCR-TFM. Figure 11 is a schematic plain view showing one end portion of the SCR-TFM of a second embodiment. Figure 12 is a schematic cross-section showing a central portion of the SCR-TFM shown in Figure 11. Figure 13 is a schematic side view showing the one end portion of the SCR-TFM shown in Figure 11.

Detailed Description of the Preferred Embodiment

(A first embodiment)
A preferred embodiment of a stator-coreless reciprocating transverse flux machine (SCR-TFM) 100 of the invention is explained referring to Figure 1. Figure 1 is a schematic side view of the SCR-TFM 100. Figure 2 is a schematic side view of a reference TFM 200 having an equal capability to the SCR-TFM 100. The

TFMs

100 and 200 are variable reluctance type.

SCR-TFM 100 shown in Figure 1 has a first mover core 11, a second mover core 12 and a stator winding 7. The stator winding 7 extends to a longitudinal direction L, which is equal to a moving direction of mover cores 11 and 12.

The first mover core 11 has a yoke 11Y, left teeth 11L and right teeth (not shown). The yoke 11Y extends to the longitudinal direction L. The left teeth 11L and the right teeth (not shown) are arranged to the longitudinal direction L with a predetermined constant pitch. Left teeth 11L and the right teeth (not shown), which extend to a height direction H from yoke 11Y, are connected magnetically via yoke 11Y and extend toward the second mover core 12.

The second mover core 12 has a yoke 12Y, left teeth 12L and right teeth (not shown). The yoke 12Y extends to the longitudinal direction L. The left teeth 12L and the right teeth (not shown) are arranged to the longitudinal direction with a predetermined constant pitch. Left teeth 12L and the right teeth (not shown), which extend to a height direction H from yoke 12Y, are connected magnetically via yoke 12Y and extend toward the first mover core 11.

The stator winding 7 is accommodated in a slot formed between left teeth 11L and the right teeth (not shown) in a width direction of the mover cores 11 and 12. Top ends of left teeth 11L of the first mover core 11 faces top ends of left teeth 12L of the second mover core 12 across a small air gap 'g'. Similarly, top ends of the right teeth of the first mover core 11 faces top ends of the right teeth of the second mover core 12 across a small air gap 'g'.

The reference TFM 200 shown in Figure 2 consists of two sub-TFMs 201 and 202. Each of the sub-TFMs 201 and 202 has an equal configuration to the SCR-TFM 100 shown in Figure 1. However, first mover cores 11, 11 of the sub-TFMs 201 and 202 are fixed to housing. In the other words, the first mover cores 11, 11 of the sub-TFMs 201 and 202 are stator cores. In addition, two

stator windings

7, 7 of the sub-TFMs 201 and 202 are connected in series to each other.

Stator winding 7 of SCR-TFM 100 shown in Figure 1 generates an equal voltage to a sum of the induced voltages of the stator windings 7 of the reference TFM 200, when a moving speed value of all mover cores of SCR-TFM 100 and reference TFM 200 are equal to each other. A moving direction of the first mover core 11 shown in Figure 1 is opposite to a moving direction of the second mover core 12 shown in Figure 1. A relative speed between two mover cores 11 and 12 of SCR-TFM 100 is double of each absolute speed value of mover cores 12 of the sub-TFMs 201 and 202.

After all, a weight, a size and an iron loss of SCR-TFM 100 shown in Figure 1 become half in comparison with reference TFM 200 shown in Figure 2. Moreover, a copper loss of SCR-TFM 100 is decreased in comparison with reference TFM 200. The copper loss of SCR-TFM 100 does not become half in comparison with reference TFM 200, because a cross-section of the stator winding 7 of SCR-TFM 100 must be reduced. However, efficiency, the weight and the size of SCR-TFM 100 shown in Figure 1 is saved larger than a conventional TFM shown in Figure 2.

A preferred configuration of the mover cores 11 and 12 shown in Figure 1 is explained referring to Figures 3-5. Figure 3 is a side view showing a central portion of SCR-TFM 100. Figure 4 is a cross-section (X-X) of SCR-TFM 100 shown in Figure 3. Figure 5 is a plain view of SCR-TFM 100 shown in Figures 3-4. However, supporting members 3-4 shown in Figure 4 is abbreviated in Figure 3 and Figure 5. A front housing 5 and a rear housing 6 of SCR-TFM 100 shown in Figure 5 are abbreviated in Figure 3 and Figure 4. SCR-TFM 100 can be adopted by a free-piston linear internal combustion engine or a free-piston linear pump or a free-piston linear compressor.

A fundamental feature of SCR-TFM 100 shown in Figures 3-5 is same as a conventional TFM of variable reluctance type except a fact that a stator core of the conventional TFM is moved to an opposite direction of a mover core of the conventional TFM.

SCR-TFM 100 has two

sub TFMs

1 and 2, a first supporting member 3, a second supporting member 4, a front housing 5 and a rear housing 6. The sub TFM 1 has a first mover core 11 and a second mover core 12. The sub TFM 2 has a first mover core 21 and a second mover core 22. The

mover cores

11, 12, 21 and 22 have a same configuration each. SCR-TFM 100 having the sub TFMs 1 and 2 has a rectangular-loop-shaped stator winding 7 extending a longitudinal direction L.

The first mover core 11 has a yoke 11Y, left teeth 11L and right teeth 11R. The yoke 11Y extends to the longitudinal direction L. The left teeth 11L and the right teeth 11R are arranged alternately to the longitudinal direction L with a predetermined constant pitch. Left teeth 11L and right teeth 11R, which extend to a height direction H from yoke 11Y, are connected magnetically via yoke 11Y.

The second mover core 12 has a yoke 12Y, left teeth 12L and right teeth 12R. The yoke 12Y extends to the longitudinal direction L. The left teeth 12L and the right teeth 12R are arranged alternately to the longitudinal direction L with a predetermined constant pitch. Left teeth 12L and right teeth 12R, which extend to the height direction H from yoke 12Y, are connected magnetically via yoke 12Y.

The first mover core 21 has a yoke 21Y, left teeth 21L and right teeth 21R. The yoke 21Y extends to the longitudinal direction L. The left teeth 21L and the right teeth 21R are arranged alternately to the longitudinal direction L with a predetermined constant pitch. Left teeth 21L and right teeth 21R, which extend to the height direction H from yoke 21Y, are connected magnetically via yoke 21Y.

The second mover core 22 has a yoke 22Y, left teeth 22L and right teeth 22R. The yoke 22Y extends to the longitudinal direction L. The left teeth 22L and the right teeth 22R are arranged alternately to the longitudinal direction L with a predetermined constant pitch. Left teeth 22L and right teeth 22R, which extend to the height direction H from yoke 22Y, are connected magnetically via yoke 22Y.

In Figure 4, one slot 8 is formed between left teeth 11L and right teeth 11R and between left teeth 12L and right teeth 12R in the width direction W. Another one slot 8 is formed between left teeth 21L and right teeth 21R and between left teeth 22L and right teeth 22R in the width direction W.

Top ends of left teeth 11L faces top ends of left teeth 12L across a small air gap 'g'. Similarly, top ends of the right teeth 11R faces top ends of the right teeth 12R across a small air gap 'g'. Top ends of left teeth 21L faces top ends of left teeth 22L across a small air gap 'g'. Similarly, top ends of the right teeth 21R faces top ends of the right teeth 22R across a small air gap 'g'. SCR-TFM 100 shown in Figures 3-5 is a variable reluctance single-phase TFM. After all, SCR-TFM 100 consists of two

sub TFMs

1 and 2, which are a variable reluctance single-phase TFM each.

In Figure 5, SCR-TFM 100 has a stator winding 7 having a pair of slot portions 7A and 7C and a pair of coil end portions 7E and 7F. In the other words, loop-shaped stator winding 7 consists of the portions 7A, 7C, 7E and 7F, of which turn-conductors are connected in order to each other. The linear slot portion 7A can be accommodated in the slot 8 of sub TFM 1 and extends to the longitudinal direction L. The linear slot portion 7C can be accommodated in the slot 8 of sub TFM 2 and extends to the longitudinal direction L. The coil end portions 7E and 7F, which are connecting two slot portions 7A and 7C, are arranged out of the slot 8. A top portion of the coil end portions 7E is supported to the front housing 5. A top portion of the of the coil end portions 7F is supported to the rear housing 6.

It is important that slot portions 7A and 7C are longer than the

mover cores

11, 12, 21 and 22 in the longitudinal direction L. Furthermore, slot portions 7A and 7C have narrower width each than a width of the slots 8 of

sub TFMs

1 and 2. Accordingly,

mover cores

11, 12, 21 and 22 enable to reciprocate to the longitudinal direction L. As shown in Figure 5, a reciprocating stroke length of

mover cores

11, 12, 21 and 22 is shorter than a sum of length L1 and L2 shown in Figure 5. For example, an air gap between the slot portions and the teeth, which face to each other, has about 2 mm in the width direction W.

Figure 6 is a schematic cross-section of a free-piton internal combustion engine employing SCM-TFM 100. The engine has a pair of cylinder blocks 10A and 10B. The first mover cores 11 and 21 are fixed to free-

pistons

91, 92 via the first supporting member 3. The

second mover core

12 and 22 are fixed to free-pistons 93, 94 via the second first supporting member 4. The free-

pistons

91 and 93 are accommodated in cylinders of the cylinder blocks 10A. The free-pistons 92 and 94 are accommodated in cylinders of the cylinder blocks 10B. The first mover cores 11 and 21 move an opposite direction of a moving direction of the

second mover cores

12 and 22. Figure 7 is a schematic side view showing another position, after the

mover cores

11, 12, 21 and 22 are moved for a 180 electrical degree from the position shown in Figure 3.

Figure 8 is a detailed cross-section showing SCR-TFM 100 shown in Figures 3-5. Each of

mover cores

11, 12, 21 and 22 consists of soft steel plates laminated to the width direction W. Figure 9 is a schematic elevation view of two laminated soft steel plates 1000, which are a part of mover core 11. Each soft steel plate 1000 consists of a yoke portion 1000Y, left diagonal portions 1000DL, left pole portions 1000SL, right diagonal portions 1000DR and right pole portions (not shown). Every soft steel plate 1000 is formed by means of cutting and bending a plain soft iron plate.

Yoke 11Y consists of laminated yoke portions 1000Y having soft magnetic sheets 1000C inserted between each two adjacent yoke portions 1000Y. The yoke portions 1000Y extend to the longitudinal direction L.

The left teeth 11L of mover core 11 have salient portions 111 and diagonal portions 112. The salient portions 111 extend to the height direction H. The diagonal portions 112 extend diagonally. The salient portions 111 consists of laminated left pole portions 1000SL having soft magnetic sheets 1000C inserted between each two adjacent pole portions 1000SL. The soft magnetic sheets 1000C are made from soft magnetic composite material. Left pole portions 1000SL and yoke portions 1000Y extend to the height direction H, too. The diagonal portions 112 consist of left diagonal portions 1000DL laminated to the width direction W.

Similarly, the right teeth 11R of mover core 11 has salient portions (not shown) and diagonal portions 112. The salient portions of the right teeth 11R have a same configuration as salient portions 111 of the left teeth 11L. The diagonal portions 112 of the right teeth 11R consists of right diagonal portions 1000DR laminated to the width direction W. The left diagonal portions 1000DL extend to the left direction. The right diagonal portions 1000DR extend to the right direction. Each of the left teeth 11L and each of the right teeth 11R are arranged alternately to the longitudinal direction L.

In Figure 8, slot portions 7A and 7C of stator winding 7 are fixed to a supporting member 70 each. The supporting members 70, of which both ends are fixed to front housing 5 and rear housing 6, are made of a non-magnetic stainless steel bar each. Two supporting members 70 are insulated from front housing 5 and rear housing 6 in order to reduce an induced secondary current. The supporting members 70 reduce vibrations of slot portions 7A and 7C, too.

(A first arranged embodiment)
One arranged embodiment of SCR-TFM 100 is explained referring to Figure 10. Figure 10 is a schematic cross-section showing the linear slot portion of stator winding 7. The stator winding 7 consists a predetermined turn-number of conductors 701, which are insulated to each other by resin material. Stator winding 7 is accommodated in a supporting member consisting of a rectangular-shaped case 700. Both ends of the case 700 made from non-magnetic stainless steel plate are fixed to front housing 5 and rear housing 6. A distance between case 700 and surfaces of

mover cores

11, 12, 21 and 22 is about 2 mm.

It is important that the linear case 700 accommodating one of two slot portions 7A and 7C of stator winding 7 is fixed to front housing 5 and rear housing 6 via an insulation member. Similarly, the other one of two slot portions 7A and 7C of stator winding 7 is fixed to front housing 5 and rear housing 6 via an insulation member. Accordingly, the secondary current of the case 700 is not induced. Case 700 reduces vibration of stator winding 7, protects stator winding 7 mechanically and radiates stator winding 7.

(A second arranged embodiment)
Another arranged embodiment of the SCR-TFM 100 is explained as bellows. The SCR-TFM 100 can employ known TFM technology, for example PCT/JP2011/000669 filed on Feb/07/2011, the title of TRANSVERSE FLUX MACHINE applied by the inventor. For example, a three-phase SCR-TFM is constructed by employing three single-phase SCR-TFMs 100 shown in Figure 4. Every first mover cores of three SCR-TFMs 100 arranged in parallel to each other is fixed to the common first supporting member 3. Every second mover cores of three SCR-TFMs 100 arranged in parallel to each other is fixed to the common second supporting member 4. Each of three phase stator currents is supplied to each of three phase windings 7 of three SCR-TFMs 100.

(A second embodiment)
The second embodiment of a three-phase SCR-TFM 200 is explained referring to Figures 11-13. Figure 11 is a schematic plain view showing one end portion of the three-phase SCR-TFM 200. Figure 12 is a schematic cross-section showing a central portion of three-phase SCR-TFM 200. Figure 13 is a schematic side view showing the one end portion of three-phase SCR-TFM 200, which is shown in Figure 11.

Three-phase SCR-TFM 200 has a U-phase SCR-TFM, a V-phase SCR-TFM and a W-phase SCR-TFM. Each of the single-phase SCR-TFMs has each pair of sub TFMs. Two U-phase sub TFMs have two first movers 11U and two second movers 12U. Two V-phase sub TFMs have two first movers 11V and two second movers 12V. Two W-phase sub TFMs have two first movers 11W and two second movers 12W.

Each of the first mover cores 11U, 11V and 11W of three upper sub TFMs is fixed to an upper portion 31 of a C-character-shaped first supporting member 3. Each of the first mover cores 11U, 11V and 11W of three lower sub TFMs are fixed to a lower portion 32 of the C-character-shaped first supporting member 3. Each of the

second mover cores

12U, 12V and 12W of three upper sub TFMs is fixed to an upper portion of a rod-shaped second supporting member 4. Each of the

second mover cores

12U, 12V and 12W of three lower sub TFMs is fixed to a lower portion of the second supporting member 4.

A loop-shaped U-phase stator winding 7U has an upper slot portion in the U-phase upper sub TFM and a lower slot portion in the lower U-phase sub TFM. A loop-shaped V-phase stator winding 7V has an upper slot portion in the V-phase upper sub TFM and a lower slot portion in the V-phase lower sub TFM. A loop-shaped W-phase stator winding 7W has an upper slot portion 70U in the W-phase upper sub TFM and a lower slot portion 70L in the W-phase lower sub TFM as shown in Figure 13. The three upper slot portions extending to the longitudinal directions L each are upon the three lower slot portions extending to the longitudinal directions L each.

As shown in Figure 13, a C-character-shaped front coil end portion 70C of the loop-shaped W-phase stator winding 7W connects both front ends of the upper slot portion 70U and the lower slot portion 70L of W-phase stator winding 7W. The front coil end portion 70C is fixed to the front housing 5. Similarly, a C-character-shaped rear coil end portion (not shown) of the loop-shaped W-phase stator winding 7W connects both rear ends of the upper slot portion 70U and the lower slot portion 70L of W-phase stator winding 7W. The rear coil end portion is fixed to the rear housing 6.

Accordingly, a compact three-phase SCR-TFM 200 with small vertical magnetic force is constructed simply. It is preferable that supporting

members

3 and 4 are connected elastically. For example, a spring is disposed between supporting member 3 and supporting members 4. When a reciprocating frequency of the SCR-TFM is constant, a resonance frequency value of the machine with the spring should accord with the constant reciprocating frequency value. A skilled engineer can understand easily that the SCR-TFM of the invention has a high power/weight ratio and a low power loss. Moreover, the stator winding and the mover cores can be cooed, because cooling air stream can be supplied into the air gap between the teeth and the slot portion of the stator winding.

Claims

A stator-coreless reciprocating transverse flux machine comprising:
a pair of mover cores (11, 12) faced to each other across a small gap (g), connected electromagnetically to each other and extended in parallel to a longitudinal direction being a moving direction; and
a stator winding (7) accommodated in a slot (8) of at least one of the mover cores (11, 12) without attaching the mover cores (11, 12);
wherein at least one of the mover cores (11, 12) has left teeth (11L,12L), right teeth (11R,12R) and a yoke (11Y,12Y) connecting the left teeth (11L,12L) to the right teeth (11R,12R) magnetically.
the stator winding (7) supported to a housing (5,6) has a slot portion (7A, 7B) accommodated in the slot (8) extending to the longitudinal direction between the left teeth (11L,12L) and the right teeth (11R,12R);
the mover cores (11,12) moving to the longitudinal direction have opposite moving directions to each other; and
a longitudinal length of the stator winding (8) is longer than a longitudinal length of the mover cores (11, 12).
The stator-coreless reciprocating transverse flux machine according to claim 1, wherein both of the mover cores (11, 12) have the left teeth (11L, 12L), the right teeth (11R, 12R) and the yoke (11Y, 12Y) each.
The stator-coreless reciprocating transverse flux machine according to claim 2, wherein the stator winding (7) is accommodated in both of the slots (8,8) formed between the left teeth (11L, 12L) and the right teeth (11R, 12R) of both of the two mover cores (11, 12) .
The stator-coreless reciprocating transverse flux machine according to claim 1, wherein the stator winding (7) has a pair of coil end portions (7E, 7F) arranged out of the slot (8); and
both of the coil end portions (7E, 7F) are supported to the housing (5, 6).
The stator-coreless reciprocating transverse flux machine according to claim 4, wherein the slot portion (7A, 7C) of the stator winding (7) is fixed to a non-magnetic supporting member (70, 700) extended to the longitudinal direction; and
the non-magnetic supporting member (70, 700) is fixed to the housing (5, 6) .
The stator-coreless reciprocating transverse flux machine according to claim 5, wherein the non-magnetic supporting member has a case (700) accommodating the slot portion (7A, 7B).
The stator-coreless reciprocating transverse flux machine according to claim 1, wherein the mover core (11, 12) has a laminated core formed with soft steel plates (1000) laminated to a width direction of the mover core (11, 12);
each of the soft steel plates (1000) has a yoke portion (1000Y), left pole portion portions (1000SL), left diagonal portions (1000DL), right pole portions (1000SR) and right diagonal portions;
the yoke (11Y,12Y) of the mover core (11,12) has laminated yoke portions (1000Y) extending to the longitudinal direction;
the left teeth (11L, 12L) of the mover core (11, 12) include the laminated left pole portions (1000SL) and the laminated left diagonal portions (1000DL);
the right teeth (11R, 12R) of the mover core (11, 12) include the laminated right pole portions and the laminated right diagonal portions (1000DR);
the left diagonal portion (1000DL) extending diagonally connects the yoke portion (1000Y) to the left pole portion (1000SL) extending to the height direction; and
the right diagonal portion (1000DR) extending diagonally connects the yoke portion (1000Y) to the right pole portion extending to the height direction.
The stator-coreless reciprocating transverse flux machine according to claim 1, wherein one of the two mover cores (11, 12) is connected mechanically to a first piston (91,92) in a first cylinder;
the other one of the two mover cores (11, 12) is connected mechanically to a second piston (93,94) in a second cylinder; and
the first piston (91,92) moves toward an opposite direction of a moving direction of the second piston (93,94).
The stator-coreless reciprocating transverse flux machine according to claim 8, wherein the pistons (91-94) consist of free pistons of one of a linear internal combustion engine, a linear pump and a linear compressor.