JPH06261501A - Motor - Google Patents

Abstract

PURPOSE:To provide such a smallsized light-weight motor that the winding work of a voltage boosting coil or transformer can be easily performed and the driving frequencies of the motor and a voltage boosting circuit can be set at arbitrary values, and then, the motor is integrated with a voltage boosting means. CONSTITUTION:A transformer 18 is used as a voltage boosting means and a space is provided by notching part of a stator 2. Then the transformer 18 is incorporated in the space and the primary winding coil 11 of the transformer 18 is connected to a power source side. The secondary winding 12 is connected to a motor driving coil side.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to an electric motor which is supplied with electric power from a power source to obtain a driving force.

[0002]

2. Description of the Related Art Recently, devices such as portable AV devices have become smaller and lighter, and actuators mounted therein are also becoming smaller and lighter. A request has been made. In addition, with regard to in-vehicle actuators as well, there is a demand for low fuel consumption of automobiles in the context of global environmental protection, and the weight of each component is being sought, and electric motors are no exception. In addition, since the electric motor for FA equipment has a limited mounting space, and the electric motor itself is a target to be moved by another actuator, downsizing and weight reduction become more important. As described above, downsizing and weight reduction of electric motors are technologies desired in various industrial fields.

Under such circumstances, the drive power source for portable AV equipment has been lowered in voltage in order to reduce the weight of the battery. For example, the number of dry batteries mounted is from 4 to 2, or from 2 to 1. Is decreasing. Further, the battery, which is the drive power source for the vehicle-mounted actuator, has a low drive voltage of 12 V due to the limited mounting space. However, lowering the voltage of the power supply means that the actuator used in the device is
In particular, it significantly deteriorates the drive characteristics of the electric motor. A reduction in the power supply voltage of the electric motor requires a large current in the electric motor, which increases a loss called copper loss, resulting in a reduction in efficiency of the electric motor. To reduce copper loss,
If you use a conductor with a small specific resistance for the coil winding of the motor,
For the coil winding, it is necessary to use a conductor wire having a large conductor cross-sectional area, which is not suitable for downsizing of an electric motor. In other words, increasing the power supply voltage is effective in reducing the size and weight of the electric motor.

On the other hand, as a prior art, as disclosed in Japanese Patent Laid-Open No. 4-255, it has been proposed to share a transformer with a part of a magnetic material used for an electric motor. FIG. 11 shows
FIG. 11 is a front view of a conventional electric motor, showing an example in which a transformer is shared with a part of a magnetic material used for the electric motor.
In the conventional example of FIG. 11, the rotor 1 has four magnetic poles, and the armature 2
The example in which the number of the side pole teeth 6 is 6 is shown, and the rotor 1 can be arbitrarily operated by the interaction between the magnetic flux generated by the rotor 1 and the magnetic flux generated by the motor winding 3 wound around each slot of the armature 2. Rotate in the direction of. Further, the transformer winding 4 is provided in the core back portion 7 of the armature 2 so that the power supply voltage is transformed. Therefore, there is an advantage that the weight and size of the whole can be reduced by sharing a part of the magnetic material used for the electric motor with the transformer core.

[0005]

However, in order to reduce the size of the electric motor, increasing the power supply voltage requires connecting the batteries in multiple stages, which increases the weight of the power supply unit and thus the entire device. It is difficult to reduce the weight and size. Further, increasing the power supply voltage gives the user of the electric motor a danger such as electric shock.

In the electric motor structure disclosed in Japanese Patent Laid-Open No. 4-255, since the magnetic flux generated by the transformer and the magnetic flux for driving the electric motor pass through the same magnetic core, the frequency of the magnetic flux acting as the electric motor and the transformer. If the frequency of the magnetic flux acting as is not set to an appropriate value, the magnetic flux acting as the electric motor and the magnetic flux acting as the transformer influence each other, and the electric motor cannot be controlled. In addition, since the transformer winding has a structure in which the outer side of the armature structure is closed, the winding work is difficult. Further, in Japanese Patent Laid-Open No. 4-255, the power supply voltage is transformed, but the concept of positively boosting the power supply voltage to improve the efficiency of the electric motor, and to realize size reduction and weight reduction is not included.

Therefore, the present invention solves the conventional problems, and an object thereof is to integrate a motor and a step-up transformer portion to avoid a danger such as electric shock to a user of the electric motor, and further boost the voltage. Coil or transformer winding work is simple, and the magnetic flux acting as an electric motor and the magnetic flux acting as a step-up transformer have independent magnetic paths so that they do not affect each other, and a booster that can be driven at any frequency The purpose is to provide a small and lightweight electric motor having functions.

[0008]

In an electric motor which receives power from a power source and obtains a driving force, it has a step-up means for stepping up the voltage of the power source, and the step-up means is integrated with the electric motor. Is characterized by.

Further, in an electric motor which is supplied with electric power from a power source to obtain a driving force, it has a step-up means for stepping up the voltage of the power source, a coil or a transformer is used as the step-up means, and a part of the stator is cut out. It is characterized in that a required space is provided and a coil or a transformer is incorporated in the space.

Further, the transformer structure is the same as that of the EI type transformer core, and the E type member and the I type member, which are magnetic cores, can be separated from each other, and the primary winding and the motor winding side connected to the drive power source side The secondary winding connected to the
It is characterized by having the magnetic core at the center of the magnetic core of the book.

Further, in an electric motor which is supplied with electric power from a power source to obtain a driving force, it has a step-up means for stepping up the voltage of the power source, a coil or a transformer is used for the step-up means, and a shaft which is a shaft of a rotor is provided. It is used as a magnetic core of a coil or a transformer.

Further, in an electric motor which is supplied with electric power from a power source to obtain a driving force, it has a step-up means for stepping up the voltage of the power source, a coil or a transformer is used as the step-up means, and a soft magnetic material or a laminated electromagnetic wave is used. A coil or transformer magnetic core is formed by using a steel plate, and the coil or transformer magnetic core is further integrated with an armature serving as a magnetic path of a magnetic flux acting on the driving of the electric motor.

The coil or transformer magnetic core is separable from the armature, and the coil or transformer magnetic core is separable.

[0014]

Embodiments of the present invention will be described below with reference to the drawings.

FIG. 1 is a front view of an electric motor showing an embodiment of the present invention, which comprises a rotor 1, an armature 2, and a transformer section 18. In this embodiment, a transformer is used as a boosting means, a part of the stator is cut out to provide a required space, and an example in which the transformer is incorporated into the space will be described in detail. Further, an inner rotation type three-phase brushless motor in which the rotor 1 is arranged at the center of the electric motor will be described as an example.

The rotor 1 is composed of a core 21 made of a magnetic material and a field magnet 5. In the present embodiment, an example in which 6 poles are magnetized is shown, and N poles and S poles are alternately generated along the circumferential direction. The armature 2 is composed of a soft magnetic material or laminated electromagnetic steel plates, and is composed of a core back portion 7 and six pole teeth 6. An electric motor winding is provided between each pole tooth 6, and the winding 8 shows the U phase, the winding 9 shows the V phase, and the winding 10 shows the W phase. The motor is driven by a magnetic pole detection device (for example, a Hall element, not shown) that detects the rotor position, or the position of the rotor 1 is detected by sensorless drive, and an appropriate drive phase is excited, which causes the rotor 1 to operate. Rotate in the direction of.

The armature 2 according to the present invention has a structure in which a generally known armature has pole teeth at equal intervals in the circumferential direction, whereas a part of the armature is cut out, and the armature 2 is required. Space is provided. A magnetic core 17 for a transformer, which is made of a soft magnetic material or laminated electromagnetic steel sheets, which is a booster, is arranged in the space. The primary winding 11 connected to the drive power source side is provided in the transformer magnetic core 17.
And the secondary winding 12 connected to the motor winding side is wound. A non-magnetic spacer 13 is inserted between the armature 2 and the transformer magnetic core 17. The transformer portion has a shape obtained by deforming a commonly used EI-shaped core in the circumferential direction of the motor, and is intended to be integrated with the electric motor.

Next, the operating principle of the transformer will be described in detail. The operating principle is the same as that of the EI type core, and the power of an arbitrary frequency derived from the power supply is supplied to the primary winding 1
Lead to 1. As a result, a magnetic flux change occurs in the transformer magnetic core, so that an induced voltage is generated in the secondary winding 12. By setting the number of turns of the primary winding 11 and the secondary winding 12, it becomes possible to obtain a required voltage in the secondary winding 12.
The electric power on the side of the secondary winding 12 is guided to the electric motor windings 8, 9, 10 as electric power for driving the electric motor.

Further, a non-magnetic spacer 13 is inserted between the armature 2 and the transformer magnetic core 17, and the magnetic flux inside the armature 2 and the magnetic flux of the transformer magnetic core 17 have independent magnetic paths. It has a structure that does not affect each other. The arrow 20 shown in the drawing indicates the flow direction of the magnetic flux in the transformer core.

Further, the transformer structure is the same as that of the EI type transformer core, and the E type member and the I type member, which are magnetic cores, can be separated from each other, and the primary winding and the motor winding side connected to the drive power source side. The secondary winding connected to the
It has a magnetic core at the center of the magnetic core of the book. Therefore, the transformer winding can be assembled easily because the coil can be formed in advance by a winding frame or the like and then incorporated in the transformer.

Next, FIG. 2 shows a drive circuit configuration diagram of the electric motor in the present invention. The voltage of the driving power supply 24 is
In step (1), the boosted electric power is guided to the electric motor 27 through the drive circuit unit 26. Here, the booster 25 is composed of a primary winding 11 and a secondary winding 12, and is wound around the transformer magnetic core 17. Further, FIG. 3 shows a diagram showing an actual example of a drive circuit for an electric motor according to the present invention. An example using a pull-push converter circuit will be described in detail in the embodiment of the drive circuit of this embodiment. This circuit includes a power supply unit 24, a transformer unit 25, a drive circuit unit 26, and an electric motor 27. In addition, the power supply unit 24
Is a battery 34, a transistor 30, a transistor 31,
It is composed of an oscillator circuit 29. In addition, the drive circuit unit 26
Is composed of a diode bridge 32, a capacitor 33, and a motor drive circuit 28. Next, the operation method of this circuit will be described in detail. The operation of this circuit turns on and off the transistor element 30 and the transistor 31 alternately by the oscillation circuit. As a result, an alternating current is generated in the primary winding 11 and an induced voltage is generated in the secondary winding 12. By setting the primary winding 11 and the secondary winding 12 to have an arbitrary winding ratio, it is possible to obtain electric power of a required voltage on the secondary winding 12 side. Further boosted power is diode bridge 3
It is converted into direct current by 2 and guided to the drive circuit. In the above-mentioned example, an example in which the pull-push converter circuit is used in the drive circuit section is shown, but the present invention is not limited to this example, and for example, a high-voltage chopper system, a boost chopper system, an inverting chopper system, a fly bag. It is obvious that each circuit such as a die system, a forward system, a center tap system, a half bridge system, a full bridge system, a ringing choke system, a Royer system, and a Jensen system can be realized.

FIG. 4 is a side sectional view of an electric motor showing a second embodiment of the present invention, which is a rotor 1, an armature 2, a housing 14, a bearing 15, a shaft 16 and a transformer winding. It comprises a winding 11 and a secondary winding 12. In the present embodiment, a detailed description will be given by taking an inner rotation type brushless motor in which the rotor 1 is arranged at the center of the electric motor as an example.

The rotor 1 is composed of a core 21 made of a magnetic material and a field magnet 5, and alternately generates N poles and S poles in the circumferential direction of the electric motor. Further, the rotor 1 is fixed to the shaft 16 by a mechanical method such as press fitting or caulking, and is movably fixed to the housing 14 via a bearing 15. Armature 2
Is made of a soft magnetic material or laminated electromagnetic steel plates and has a plurality of pole teeth. An electric motor winding 3 is provided on each pole tooth. Transformer winding 1
The secondary winding 11 and the secondary winding 12 have a shaft 16 which is a rotating body.
The housing 14 at a position with an appropriate gap
It is fixed to. In the present invention, the shaft 16 which is the shaft of the rotor is used as the magnetic core of the step-up transformer. Therefore, the shaft 16, which constitutes the magnetic circuit of the step-up transformer,
The bearing 15 and the housing 14 are made of a magnetic material or a material containing a magnetic material. The electric motor is driven by detecting the position of the rotor 1 by a magnetic pole detecting device (for example, a Hall element, not shown) that detects the position of the rotor, or by sensorless driving, and an appropriate drive phase is excited. Therefore, the rotor 1 rotates in the required direction.

Next, the operating principle of the transformer will be described in detail. The magnetic flux acting as a transformer is shown by an arrow 20 in the figure, and the magnetic path is constituted by the shaft 16, the bearing 15, and the housing 14. Power of arbitrary frequency derived from the power source is located around the shaft 1
Lead to the next coil winding 11. As a result, a change in magnetic flux occurs in the shaft 16 which is in the transformer core, which causes an induced voltage in the secondary winding 12. By setting the primary winding 11 and the secondary winding 12 to have an arbitrary number of turns, the secondary winding 1
2 makes it possible to obtain the required voltage. Secondary winding 1
The electric power on the second side is connected to the electric motor winding 3 as electric power for driving the electric motor.

Therefore, since the magnetic flux of the electric motor uses the inside of the armature 2 as the magnetic path and the magnetic flux acting on the transformer uses the shaft 16, the bearing 15, and the housing 14 as the magnetic path, the respective magnetic fluxes pass through different magnetic paths. , The structure does not affect each other.

Primary windings 11 and 2 which are step-up transformers
The winding of the next winding 12 can be easily performed by forming a coil with a winding frame or the like and then assembling the motor.

FIG. 5 is a side sectional view of an electric motor showing a third embodiment of the present invention, in which a rotor 1, an armature 2, a housing 14, a bearing 15, a shaft 16 and a primary winding which is a boost coil. 11 and the secondary winding 12.

The boosting coil provided in this embodiment is configured only on one side of the rotor 1, and the primary winding 11
The secondary winding 12 is wound at the same position.

Next, the operating principle of the transformer will be described in detail. Electric power of an arbitrary frequency derived from a power source is guided to the primary coil winding 11 wound around the shaft 16. As a result, a change in magnetic flux occurs in the shaft 16 that is the transformer core, which causes an induced voltage in the secondary winding 12. By setting the number of turns of the primary winding 11 and the secondary winding 12, it becomes possible to obtain a required voltage in the secondary winding 12. The electric power on the secondary winding 12 side is connected to the electric motor winding 3 as electric power for driving the electric motor. The arrow 20 shown in the drawing indicates the flow direction of the magnetic flux in the magnetic core.

Therefore, the magnetic flux of the electric motor uses the magnetic path inside the armature 2, and the magnetic flux of the transformer action is the shaft 16 and the bearing 1.
5. Since the housing 14 serves as a magnetic path, the respective magnetic fluxes do not affect each other. In addition, the winding method of the primary winding 11 and the secondary winding 12 of the transformer can be easily performed by forming a coil with a winding frame or the like in advance and incorporating the coil when assembling the motor.

FIG. 6 is a side sectional view of an electric motor showing a fourth embodiment of the present invention, in which a rotor 1, an armature 2, a housing 14, a bearing 15, a shaft 16 and a primary winding which is a boost coil. 11 and the secondary winding 12. The housing 14 of this embodiment is divided and is configured to sandwich the armature 2.

Next, the operating principle of the transformer will be described in detail. In the present embodiment, the shaft 16 which is the shaft of the rotor is used for the magnetic core of the step-up transformer. Therefore, the magnetic path of the magnetic flux acting as a transformer is the shaft 16,
The bearing 15, the housing 14, and the back of the armature 2.
Electric power of an arbitrary frequency derived from a power source is guided to the primary coil winding 11 wound around the shaft 16. As a result, a change in magnetic flux occurs in the shaft 16 that is the transformer core, which causes an induced voltage in the secondary winding 12. By setting the number of turns of the primary winding 11 and the secondary winding 12 to 2
It is possible to obtain a required voltage in the secondary winding 12. Two
The electric power on the side of the next winding 12 is connected to the electric motor winding 3 as electric power for driving the electric motor.

Accordingly, the magnetic flux of the electric motor uses the inside of the armature 2 as a magnetic path, and the magnetic flux acting as a transformer is the shaft 1.
6, the bearing 15, the housing 14, and the back of the armature 2 are magnetic paths, and they do not affect each other because they pass different magnetic paths. In the present embodiment, the magnetic flux acting as the electric motor and the magnetic flux acting as the step-up transformer take the armature 2 in the magnetic path. However, the sum of the respective magnetic fluxes is sufficiently low or equal to the saturation magnetic flux of the armature. Little impact.

The primary winding 11 and the secondary winding 1 of the transformer
The second winding method can be easily performed because a coil is formed in advance by a winding frame or the like and is assembled at the time of assembling the motor.

FIG. 7 is a side sectional view of an electric motor showing a fifth embodiment of the present invention, which is composed of a rotor 1, an armature 2, a housing 14, a bearing 15, a shaft 16 and a booster 18. . FIG. 8 is a perspective view of the electric motor showing the present embodiment, and shows the transformer portion 18 and the armature 2. In this embodiment, a brushless adder type electric motor in which the rotor 1 is arranged at the center of the electric motor will be taken up for description. The step-up transformer unit 18 in the present embodiment includes the rotor 1 and the armature 2.
It is installed in the axial direction of and is composed of a soft magnetic material or laminated electromagnetic steel sheets. The transformer core is
It is possible to divide into a transformer magnetic core 17A and a transformer magnetic core 17B, and the primary windings 11 and 2 of the transformer winding are provided.
The next winding 12 is wound. The transformer magnetic core 17A and the transformer magnetic core 17B are fixed to the armature 2 by caulking or the like using a fixing member 19. In the present embodiment, the example in which the transformer magnetic core is divided into two is shown, but the present invention is not limited to this, and it is also possible to divide into three or more.

Next, the operating principle of the transformer will be described in detail. Electric power of an arbitrary frequency derived from a power source is guided to the primary winding 11. As a result, a magnetic flux change occurs in the transformer magnetic core 17, which causes an induced voltage in the secondary winding 12. By setting the number of turns of the primary winding 11 and the secondary winding 12, it becomes possible to obtain a required voltage in the secondary winding 12. The electric power on the side of the secondary winding 12 is connected to the electric motor winding 3 as electric power for driving the electric motor.

Therefore, since the magnetic flux for driving the electric motor uses the armature 2 as a magnetic path and the magnetic flux acting as a transformer uses the transformer core 17 as a magnetic path, the magnetic fluxes do not affect each other.

Further, since the transformer magnetic core 17 can be divided, the primary winding 11 and the secondary winding 12 which are transformer windings can be easily formed. Further, the transformer magnetic core 17 after the transformer winding is integrated with the armature 2 by a simple method such as caulking.

FIG. 9 is a side sectional view of an electric motor showing a sixth embodiment of the present invention. The rotor 1, the armature 2 and the bearing 1 are shown in FIG.
5, shaft 16, housing 14, and transformer section 18. FIG. 10 is a perspective view of an electric motor showing an embodiment of the present invention, showing a transformer section 18 and an armature 2. The transformer section 18 in the present embodiment is formed integrally with the armature 2 in the radial direction of the armature 2. The primary winding 11 and the secondary winding 12, which are windings for a transformer, have a magnetic core 17
The magnetic core 17 is fixed to the foot 23 provided in the radial direction of the armature 2 by a fixing method such as caulking. The magnetic flux acting on the transformer of the present embodiment is applied to the transformer core 17 and the foot 2 provided in the armature radial direction.
Let 3 be the magnetic path.

Next, the operating principle of the transformer will be described in detail. Electric power of an arbitrary frequency derived from a power source is guided to the primary coil winding 11. As a result, a magnetic flux change occurs in the transformer magnetic core 17, which causes the secondary winding 12
An induced voltage is generated in. Primary winding 11 and secondary winding 12
With a desired number of turns, it is possible to obtain a required voltage on the secondary winding 12. The electric power on the secondary winding side is connected to the electric motor winding 3 as electric power for driving the electric motor.

Further, due to the gap 22 provided between the armature 2 and the foot 23, that portion becomes a magnetic resistance, so that the magnetic flux acting as a transformer and the magnetic flux acting as an electric motor have different magnetic paths. Become. Therefore, the magnetic flux acting as the electric motor and the magnetic flux acting as the transformer do not influence each other.

Further, the transformer magnetic core 1 of the transformer section 18
Since 7 is divided, the primary winding 11 and the secondary winding 12, which are transformer windings, can be easily wound. Further, the transformer magnetic core 17 provided with the transformer winding can be integrated with the electric motor by a simple method such as caulking.

With the configuration described above, the magnetic flux acting as the electric motor and the magnetic flux acting as the transformer do not influence each other, so that the drive frequency of the electric motor winding and
The drive frequency of the transformer winding can be operated at any frequency. Therefore, the conventional problem that the drive control of the motor is adversely affected unless the drive frequency of the motor winding and the drive frequency of the transformer winding are set to appropriate values is solved, and the drive frequency of the motor and the drive frequency of the transformer winding are solved. Can be driven at an optimum frequency with which each efficiency and the like becomes high.

The transformer winding is also easy and can be incorporated in the motor by a simple operation.

[0045]

As described above, the electric motor of the present invention is
By having the step-up means and integrating the step-up coil or transformer with the motor, the electric motor can be reduced in size and weight, and the user of the electric motor is not exposed to electric shock. Further, by separately configuring the magnetic paths so that the magnetic flux acting to drive the electric motor and the magnetic flux acting on the coil or the transformer do not influence each other, the drive frequency of the electric motor drive coil and the coil or The drive frequency of the transformer winding can be independently driven at an arbitrary frequency. Further, it is possible to provide an electric motor having a simple winding method for a transformer.

[Brief description of drawings]

FIG. 1 is a front view of an electric motor showing an embodiment of the present invention.

FIG. 2 is a drive circuit configuration diagram of an electric motor in the present embodiment.

FIG. 3 is a diagram showing an actual example of a drive circuit for an electric motor according to the present invention.

FIG. 4 is a side sectional view of an electric motor showing an embodiment of the present invention.

FIG. 5 is a side sectional view of an electric motor showing another embodiment of the present invention.

FIG. 6 is a side sectional view of an electric motor showing another embodiment of the present invention.

FIG. 7 is a side sectional view of an electric motor showing an embodiment of the present invention.

FIG. 8 is a perspective view of an electric motor showing an embodiment of the present invention.

FIG. 9 is a side sectional view of an electric motor showing another embodiment of the present invention.

FIG. 10 is a perspective view of an electric motor showing an embodiment of the present invention.

FIG. 11 is a front view of a conventional electric motor.

[Explanation of symbols]

 1. Rotor 2. Armature 3. Motor winding 4. Winding for transformer 5. Field magnet 6. Polar teeth 7. Core back section 8. U phase 9. V phase 10. W phase 11. Transformer primary winding 12. Transformer secondary winding 13. Non-magnetic spacer 14. Housing 15. Bearing 16. Shaft 17. Magnetic core for transformer 18. Transformer section 19. Fixing member 20. Arrow indicating the flow direction of magnetic flux 21. Core 22. Void 23. Foot 24. Drive power supply 25. Boosting unit 26. Drive circuit unit 27. Electric motor 28. Drive circuit 29. Oscillation circuit 30, 31. Transistor 32. Diode bridge 33. Capacitor 34. battery

Claims (6)

[Claims] 1. An electric motor, which is supplied with electric power from a power source to obtain a driving force, has a step-up means for stepping up the voltage of the power source, and the step-up means is integrated with the electric motor. Electric motor. 2. An electric motor that receives power from a power source to obtain a driving force, has a step-up means for stepping up the voltage of the power source, and uses a coil or a transformer as the step-up means to cut a part of the stator. Provide the required space,
An electric motor characterized by incorporating a coil or a transformer in the space. 3. A transformer structure having the same structure as an EI type transformer core, wherein an E type member and an I type member, which are magnetic cores, are separable from each other, and a primary winding and a motor winding connected to a drive power source side. 3. The electric motor according to claim 2, wherein the secondary winding connected to the side is provided at the center of the three cores of the E-shaped core. 4. A motor, which is supplied with electric power from a power source to obtain a driving force, has a step-up means for stepping up the voltage of the power source, and a coil or a transformer is used as the step-up means, and a shaft which is a shaft of a rotor. Is used for the magnetic core of a coil or a transformer. 5. An electric motor which receives power from a power source and obtains a driving force, has a step-up means for stepping up the voltage of the power source, and uses a coil or a transformer as the step-up means, and is made of a soft magnetic material or laminated. An electric motor comprising a magnetic core for a coil or a transformer formed of an electromagnetic steel plate, and the magnetic core for the coil or the transformer is further integrated with an armature serving as a magnetic path of a magnetic flux acting on the drive of the electric motor. 6. The electric motor according to claim 6, wherein the coil or transformer magnetic core is separable from the armature, and the coil or transformer magnetic core is separable.