WO2015018245A1

WO2015018245A1 - Brushless permanent magnet motor with axially-adjustable stator iron core coil, and control system thereof

Info

Publication number: WO2015018245A1
Application number: PCT/CN2014/081311
Authority: WO
Inventors: 张贻强; 张福兴
Original assignee: Zhang Yi Qiang Jake
Priority date: 2013-08-05
Filing date: 2014-06-30
Publication date: 2015-02-12
Also published as: CN103501098B; CN103501098A

Abstract

A brushless permanent magnet motor with an axially-adjustable stator iron core coil, and a control system thereof. The motor comprises: a motor shell (1), a permanent magnet rotor (3), and a stator iron core coil (4) which is axially movably installed on the inner wall of the motor shell. The system comprises: the motor (1), an AC/DC rectifying unit, a control unit and a voltage sampling unit, wherein the voltage sampling unit collects the output voltage of the AC/DC rectifying unit and transmits the output voltage to the control unit, and the control unit controls the output quantity of a servo drive unit. By way of axially moving the position of the stator iron core coil (4) with respect to the permanent magnet rotor (3), the coil effective magnetic flux of the stator iron core coil (4) is changed. In combination with the fact that the position of the stator iron core coil (4) is controlled by the control unit in a power supply control system by collecting the voltage output quantity of the motor, feedback adjustment is performed on the power generation output of the motor, such that stable voltage and power output during electricity generation of the brushless permanent magnet motor can be realized under the condition where the rotating speed of the motor rotor is higher than a rated rotating speed and varies dynamically.

Description

Stator core coil axially adjustable brushless permanent magnet motor and control system thereof

The invention relates to the technical field of permanent magnet motors, in particular to a stator core coil axially adjustable brushless permanent magnet motor/generator and a control system thereof. Background technique

Electric machine (English: Electric machine) is an electromagnetic device that converts electrical energy into mechanical energy or mechanical energy into electricity (transmission) according to the law of electromagnetic induction. In the circuit, the letter M (old standard is D) is used. Its main function as a motor is to generate drive torque and speed as a power source for electrical appliances or various machines. A permanent magnet motor requires a controller drive; or an electronic commutator, which is represented by a letter G in the circuit. Its main function is to convert mechanical energy into electrical energy.

Although the working principle of the generator and the motor are both based on the principle of electromagnetic conversion, there are differences in the structural design. At present, the objects considered for the control of the motor are the rotational speed and the torque, and for the control of the generator, the object to be considered It is the voltage, current stability and conversion efficiency.

Since the external force driving the rotor of the generator in reality is uncontrollable (such as uncontrollable wind power of wind power generation, uncontrollable water flow in hydropower generation, etc.), or in a specific application, the generator rotor is driven. The drive is erratic (for example, the indefinite change of the engine shaft in automobile power generation), so the voltage generated by the generator fluctuates greatly, which is not conducive to conversion to a stable voltage for daily use. In the prior art, it is used for mounting on the rotor. The technical solution of the mechanical gear transmission changes the gear shift ratio in time according to the change of the external force to ensure the stable rotation speed of the rotor, but this solution has the problems of heavy volume and high maintenance cost. Some technicians have also proposed the idea of using a DC-DC DC converter to obtain a stable voltage. However, the problem with this technical solution is that the DC-DC's voltage conversion efficiency at high current is not excellent, and the range of the input voltage can be changed. Limited, poor reliability, the effect of the actual application is not ideal.

The two main motors on the existing automobile engine, one is a DC brush starter motor (Starter Motor), which is used to convert the electrical energy of the battery into a short-term mechanical energy to start the internal combustion engine. The other is a DC brushed excitation generator (Alternator), which continuously drives the generator to output the rectified DC power to charge the battery and other systems. The coexistence of the two motors undoubtedly increases the size and cost of the car, which is not conducive to Reduce the weight of the car, and work efficiency needs to be improved. Summary of the invention

The invention provides a stator core coil axial adjustable brushless permanent magnet motor and a power supply control system thereof, which can solve the above problems.

An axially adjustable brushless permanent magnet motor for a stator core coil according to an embodiment of the invention includes: a motor housing, a permanent magnet rotor rotatably mounted in the motor housing, and a coil wound on the core a stator core coil, the stator core coil is axially movably mounted on an inner wall of the motor housing, and the stator core coil is driven by a driving device to move axially along the inner wall of the motor housing to change the relative permanent magnet rotor of the coil winding Effective magnetic flux.

Preferably, a sidewall of the motor housing is axially opened with a guiding gap, and the stator core coil is fixed in a fixing device, and a driving connection portion for connecting the driving device is disposed at a position of the outer side wall of the fixing device opposite to the guiding gap. The driving device drives the driving connection portion to reciprocate in the axial direction through the guiding slit, and the driving connecting portion is integrally coupled with the fixing device.

Preferably, the fixing device is a hollow guiding cylinder which is open at both ends, the stator core coil is embedded in the hollow guiding cylinder and moves integrally with the hollow guiding cylinder, and the driving connecting portion is an axial tooth disposed on the outer side wall of the hollow guiding cylinder The drive device is a drive gear that meshes with the axial rack.

Preferably, the outer side wall of the fixing device is further provided with an axial key groove, and the inner wall of the motor housing is provided with a guiding key at a position opposite to the axial key groove, and the guiding key protrudes into the key groove.

Preferably, the fixing device is a hollow guiding cylinder which is open at both ends, the stator core coil is embedded in the hollow guiding cylinder and moves integrally with the hollow guiding cylinder, and the driving connecting portion is radially extended to the outer wall of the hollow guiding cylinder to a guiding protrusion in the guiding gap, the upper surface of the guiding protrusion is provided with an axial rack; the driving device is preferably, the outer wall of the hollow guiding tube is provided with another guiding protrusion symmetric with the guiding protrusion, the motor An axial direction of the inner wall of the housing corresponding to the other guiding protrusion is guided to the IHJ groove, and the other guiding protrusion is placed in the guiding groove and is movable along the guiding groove in the axial direction.

Preferably, the driving device further comprises a servo motor, and the driving gear is mounted on the output shaft of the servo motor.

The embodiment of the invention further provides a stator core coil axial adjustable brushless permanent magnet motor control system, comprising: an AC/DC rectifying unit, a control unit, a voltage sampling unit and the stator core coil of the above embodiment. The adjustable brushless permanent magnet motor, the driving device is a servo driving device, and the motor phase line of the axially adjustable brushless permanent magnet motor of the stator core coil is connected to the input end of the AC/DC rectifying unit, and the voltage 釆 The output voltage of the sample unit AC/DC rectification unit is transmitted to the control unit, and the control unit controls the output of the servo drive unit.

Preferably, the method further includes an electronic commutator and a line switching unit, wherein the brushless permanent magnet motor is connected to the line switching unit through the phase line thereof, and the line switching unit is further connected to the electronic commutator and the AC/DC rectifying unit, respectively, and the line switching unit receives The control signal of the control unit is selected to switch on the brushless permanent magnet motor and the electronic commutator or to selectively switch on the brushless permanent magnet motor and the AC/DC rectifying unit.

Preferably, the switching unit includes a first terminal for connecting a phase line of the permanent magnet motor, a second terminal for connecting the electronic commutator, and a third terminal for connecting the AC/DC rectifying unit, The first terminal is respectively connected to the second terminal and the third terminal through a relay, and the relay is controlled by the control unit.

Preferably, the voltage sampling unit comprises a comparator, one comparator of the comparator is connected to the reference voltage, the other comparator of the comparator is connected to the output voltage of the AC/DC rectifier, and the output of the comparator is connected to the control unit. .

Preferably, the voltage sampling unit is a voltage dividing sampling circuit formed by a plurality of series resistance grounding, wherein a partial pressure on a voltage dividing resistor is connected to the control unit.

The above technical solution can be seen that, due to the position of the axially moving stator core coil relative to the permanent magnet rotor in the embodiment of the invention, the effective magnetic flux of the stator core coil is changed, and in the case of dynamic change of the rotor speed, combined with the power supply control The control unit in the system controls the position of the stator core coil corresponding to the rotor magnet by collecting the voltage output of the motor, and realizes the voltage stable output of the brushless permanent magnet motor during power generation. DRAWINGS

In order to more clearly illustrate the embodiments of the present invention or the technical solutions in the prior art, the drawings used in the embodiments or the description of the prior art will be briefly described below. Obviously, the drawings in the following description are only It is a certain embodiment of the present invention, and those skilled in the art can obtain other drawings according to these drawings without any creative work. 1 is a block diagram showing the structure of a power supply control system in Embodiment 1 of the present invention;

2 is a side cross-sectional structural view showing the upper half of the permanent magnet motor in the first embodiment of the present invention; FIG. 4 is a front cross-sectional structural view showing the permanent magnet motor in the first embodiment of the present invention; 6 is a schematic perspective structural view of a hollow guide cylinder of a permanent magnet motor according to Embodiment 2 of the present invention;

Figure 7 is a front cross-sectional structural view showing a permanent magnet motor in Embodiment 2 of the present invention;

Figure 8 is a block diagram showing the structure of a power supply control system in Embodiment 3 of the present invention;

Figure 9 is a block diagram showing the structure and connection of a line switching unit in Embodiment 3 of the present invention.

Reference numerals: 1, motor housing; 11, guide gap; 15, guide button; 101, relay; 102, relay; 2, bearing; 3, rotor; 31, permanent magnet; 4, stator core coil; Hollow guide bush; 51, guide protrusion; 52, axial rack; 53, another guide protrusion; 55, keyway; 6, servo motor; 61, drive gear. detailed description

BRIEF DESCRIPTION OF THE DRAWINGS The technical solutions in the embodiments of the present invention will be described in detail with reference to the accompanying drawings. All other embodiments obtained by a person of ordinary skill in the art based on the embodiments of the present invention without creative work are within the scope of the present invention.

Example 1

Embodiments of the present invention provide a stator core coil axially adjustable brushless permanent magnet motor control system, as shown in FIG. 1, comprising: a permanent magnet motor, an AC/DC rectifier unit, a control unit, and a voltage sampling unit.

The permanent magnet motor is a stator core coil axially adjustable brushless permanent magnet motor, comprising: a motor housing, a permanent magnet rotor rotatably mounted in the motor housing, and a stator core formed by winding a coil around the core The coil, the stator core coil is axially movably mounted on the inner wall of the motor housing, and the stator core coil is axially moved along the inner wall of the motor housing by a driving device to change the effective magnetic flux of the permanent magnet rotor on the coil winding thereof. . It can be understood that the manner in which the coil is wound on the core to form the stator core coil can be completed by those skilled in the art, and the stator core coil can be enclosed in a circular barrel shape so that the permanent magnet rotor can be A permanent magnet portion is disposed therein, the stator core coil may include a multi-pole coil winding, and the rotor of the motor is a permanent magnet rotor, and the permanent magnet rotor may be made of a neodymium iron boron material.

The working principle of the permanent magnet motor in the embodiment of the present invention is the same as that of the existing motor, and the effective magnetic flux control of the permanent magnet rotor of the coil of the stator core coil is different, and the magnetic induction line of the permanent magnet rotor is composed of a magnetic pole. The coil passing through the stator core coil reaches the other magnetic pole, which is regarded as the effective magnetic flux of the permanent magnet rotor to the coil of the stator core coil, and the magnetic induction electromotive force generated on the coil of the stator core coil E=BLV, where B is the magnetic induction intensity, L For the effective length of the coil, V is the permanent magnet rotor relative to the stator The speed of the core coil; where L is the immutable value, V becomes larger, and B must be reduced to ensure that E (back electromotive force) does not change. For the basic structure of the motor, reference can be made to the existing motor structure, which will not be described here.

The power supply control system in the embodiment of the present invention is directed to a stator core coil axially adjustable brushless permanent magnet motor. Therefore, the stator core coil of the permanent magnet motor in the embodiment of the present invention is axially movable, and the axial direction of the stator core coil The movement causes a change in the effective magnetic flux of the permanent magnet rotor, that is, when the stator core coil and the permanent magnet rotor are radially coincident, the effective magnetic flux of the coil of the stator core coil is the largest, when the stator core coil completely moves to the side of the permanent magnet rotor When the stator core coil and the permanent magnet rotor are not completely coincident in the radial direction, the effective magnetic flux of the coil of the stator core coil is almost zero. At this time, even if the rotational speed of the rotor is fast, the output voltage of the generator is still close to zero.

In order to ensure that the effective magnetic flux of the stator coil is changed every time the stator core coil is moved, the axial length of the stator core coil in the embodiment of the present invention is equal to the axial length of the permanent magnet of the permanent magnet rotor. Thus, the stator core coil and the permanent magnet rotor have a unique radial full coincidence point, and only at the only radial full coincidence point, the coil of the stator core coil obtains the maximum effective magnetic flux of the permanent magnet rotor, and Moving the stator core coil axially to the left or right reduces the effective magnetic flux to the coil of the stator core coil.

In the embodiment of the invention, the motor housing is three times longer than the axial length of the stator core coil, so that the stator core coil can move in two directions at the position of the only radial full coincidence point, and the voltage output of the generator can be reduced. , enabling more flexible control methods.

Of course, in other embodiments, the motor housing is twice the axial length of the stator core coil, and the stator core coil is moved in the same direction with a unique control effect (single reduction or single increase of the coil of the stator core coil is effective) magnetic flux).

It can be understood that a person skilled in the art can realize the axial movement of the stator core coil on the inner wall of the motor casing in various ways, for example, opening a through hole in the front cover or the rear cover of the motor casing, and driving the device through a drive The shaft penetrates into the through hole and is connected to the stator core coil, and the driving device drives the driving shaft to move in the axial direction to realize integral linkage of the stator core coil; but in the embodiment of the invention, the stator core coil is further ensured to be more precise. Controllable performance, and to ensure that the stator core coil remains stable during the movement, avoiding fluctuations in the movement, the side wall of the motor casing is axially opened with a guiding gap, and the stator core coil is fixed in a fixing device, and the fixing device is provided There is a drive connecting portion extending radially into the guiding slit, and the driving device drives the driving connecting portion to reciprocate in the guiding slit. It can be understood that in other embodiments, the fixing device is mainly used for integrally fixing the stator core coil and the stator core coil. The fixing frame has a ring structure, which can fix the stator core coil on the one hand, and can match the inner cavity of the drum-shaped motor casing on the other hand, and can provide a push on the outer side of the fixed frame The rod serves as a driving connection portion, and the driving device can directly push or pull the pushing rod to drive the fixing frame and the stator core coil in the fixing frame to be integrally linked in the axial direction.

In the embodiment of the present invention, the fixing device is a hollow guiding cylinder which is open at both ends, and the stator core coil is embedded in the hollow guiding cylinder and moves integrally with the hollow guiding cylinder. The driving connecting portion is a diameter disposed on the outer wall of the hollow guiding cylinder. To the guide projection extending into the guide slit, the upper surface of the guide projection is provided with an axial rack, so that the guide projection can function not only to drive the joint but also to prevent the hollow guide drum. The hollow guide tube can completely enclose the stator core coil, and can effectively avoid the electromagnetic outward direct radiation generated by the coil of the stator core coil while fixing the stator core coil, and the fixing effect is better. Further, axial projections may be integrally formed on the circumference of the outer wall of the hollow guide bush to form a heat dissipating protrusion, or directly formed into a fin structure in an integrally formed manner, so as to increase the heat dissipation effect when the stator core coil is operated.

For the specific structure of the motor in the embodiment of the present invention, as shown in FIG. 2, FIG. 3 and FIG. 4, the permanent magnet motor has a motor housing 1 , and the motor housing 1 is provided with bearings 2 at both axial ends, and the rotor 3 fixed to the bearing 2 to realize the rotatably mounting of the rotor, the rotor 3 is provided with a permanent magnet 31, the stator core coil 4 is fixed in the hollow guide cylinder 5, and the hollow guide cylinder 5 is open at both ends to enable the rotor to pass through and the stator core The outer wall of the hollow guide tube 5 is provided with an axially extending guide protrusion 51. It can be understood that the guide protrusion and the guide tube may be integrally formed during the pre-production, or may be guided later. Mounted on the outer wall of the guide bush, for example, a mounting groove is formed on the outer wall of the guide bush, the bottom surface of the guiding protrusion is provided with a mounting portion, and then the mounting portion is embedded in the mounting groove to form an interference fit or direct welding Yes, the guiding protrusion and the guiding cylinder are assembled by means of mounting, which is more convenient for installing the guiding cylinder into the motor housing later; the upper surface of the guiding protrusion 51 is provided with an axial rack 52, the motor casing The side wall of the body 1 is provided with a guiding protrusion 5 Corresponding and width-matching axial guiding slits 11, the guiding protrusions 51 projecting into the guiding gaps 11, which can prevent the stator core coil from shaking in the circumferential direction, and the guiding protrusions 51 can be moved along the guiding gaps 11 in the axial direction, driving The device comprises a servo motor 6 and a servo driver connected to the servo motor. The servo driver is used for driving the forward and reverse rotation of the servo motor, the servo driver is connected to the control unit, and the drive gear 61 is mounted on the output shaft of the servo motor. It is understandable that Once the drive gear is not driven by the motor, it can still be manually driven The rotating shaft of the driving gear is mounted on a bearing, and the bearing is mounted on a fixed seat. The rotating shaft can be mounted at a side away from the driving gear to install a rocker, and the rocking handle can drive the driving gear to move the axial rack. Implement manual drive.

In the embodiment of the present invention, the outer wall of the guide cylinder 5 is provided with another guiding protrusion 53 symmetrical with the guiding protrusion 51, and the axial direction of the inner wall of the motor housing 1 corresponding to the other guiding protrusion 53 is IHJ. The groove, the other guiding protrusion 53 is placed in the guiding groove and is movable in the axial direction along the guiding groove.

Since the guide projections on the guide bush 5 are symmetrically disposed in the embodiment of the present invention, the conduction 5 may not contact the inner wall of the motor housing 1, that is, the outer wall of the guide bush 5 and the inner wall of the motor housing 1 exist. The gap reduces the frictional resistance between the two surfaces and facilitates the sliding of the conduction 5 .

Of course, in use, the guide projection 51 is located above the guide cylinder 5, and the other guide projection 53 is located below the guide cylinder 5, in another embodiment, the other guide projection may be Between the 53 and the guiding groove, a ball may be filled to change the sliding friction between the other guiding protrusion and the guiding groove as rolling friction, and the movable performance of the guiding cylinder 5 is increased, in the other guiding convex The spherical guide faces may be provided at both ends to further increase the interaction performance of the guide bush 5.

Of course, the guiding groove can also be changed to a guiding slit corresponding to the guiding slit 11 , and an axial rack is also arranged on the guiding protrusion below the guiding cylinder 5, so that the structure of the entire permanent magnet motor is symmetrically up and down. The other servo motor is disposed at the guiding gap below the motor housing 1, and is driven by the same servo driver, so that the driving of the guiding cylinder 5 is symmetrically driven, further ensuring the stability of the driving, but the cost is relatively increased.

It can be understood that the tooth density of the axial rack and the tooth density of the drive gear can be adjusted as needed. The greater the tooth density of the drive gear and the axial rack, the more precise the control. When the number of teeth of the driving gear is equal to the number of teeth of the axial rack, the axial rack moves by one tooth at an angle of one tooth of the servo motor, so the lead length of the driving gear can be used as a reference in the early planning. Facilitate pre-planning calculations.

In some cases, especially when the output of the generator is higher, the voltage generated by the AC/DC rectifier unit at its output still has a higher voltage level, and the control unit does not use the MCU chip or the CPU chip. With such a high voltage, a voltage sampling unit is used in the embodiment of the present invention to collect a voltage having a proportional relationship with the generator output. As shown in FIG. 5, the voltage sampling unit in the embodiment of the present invention is used. For the voltage division sampling circuit formed by a plurality of series resistors, one end of the voltage dividing sampling circuit is connected to the output single of the AC/DC rectifying unit, and the other end is grounded, and the voltage dividing circuit of one voltage dividing resistor R1 is connected to the control. Unit. The terminal A drawn from the voltage dividing resistor R1 in the voltage dividing sampling circuit is connected to the control unit, and the control unit calculates the voltage value outputted by the sampling unit, and then outputs a control signal to the servo driver, and the servo driver controls the servo motor. Rotating a certain angle to realize the relative movement of the stator core coil relative to the permanent magnet rotor, the voltage divider sampling circuit is suitable for feedback control of a certain stable voltage value of the generator output. It can be seen that the voltage sampling unit can proportionally convert the voltage outputted by the AC/DC rectifier unit into the usable range.

In other embodiments, the voltage sampling unit includes a comparator, one comparator of the comparator is connected to the reference voltage, the other comparator of the comparator is connected to the output voltage of the AC/DC rectifier, and the output of the comparator is connected. unit. The voltage sampling unit makes the control type of the system become comparative feedback type, that is, when the output voltage of the generator is too high, the voltage of the other comparison end of the comparator is higher than the reference reference voltage, and the comparator outputs a level signal to The control unit, after receiving the level signal, the control unit immediately sends a control signal to the servo driver, and the servo driver drives the servo motor to rotate at a certain angle, so that the radial overlap area of the stator core coil relative to the permanent magnet rotor is reduced, thereby generating electricity. The output of the machine is reduced, and the voltage sampling circuit is suitable for control in which the generator output is limited to a certain voltage limit.

According to the stator core coil axial adjustable brushless permanent magnet motor control system provided in the above embodiment of the present invention, it can be seen that the control unit monitors the output voltage level of the generator in real time through the voltage sampling unit, and real time according to the feedback voltage thereof. Controlling the stator core coil position of the generator to achieve stable output of the generator. Since the stator core coil does not rotate, it has easier operability and stability control than the existing technical solution for controlling rotor movement. Sexually improved.

Example 2:

The embodiment of the present invention also provides a stator core coil axially adjustable motor control system, which differs from the above embodiment 1 in that the structure of the motor is slightly improved. As shown in FIG. 6 and FIG. 7 , in the embodiment of the present invention, the fixing device is still a hollow guiding tube 5 which is open at both ends, and the stator core coil 4 is embedded in the hollow guiding tube 5 and moves with the hollow guiding tube 5, the difference is The driving connecting portion is an axial rack 52 disposed on the outer side wall of the hollow guiding tube, and does not need to increase the guiding protrusion as in the first embodiment, and the teeth are arranged in the axial direction only on the outer side wall of the hollow guiding tube. The slot is sufficient; the drive is still a drive gear that meshes with the axial rack.

In the embodiment of the invention, the driving device drives the hollow guiding cylinder to generate movement. The standard name of the moving mode is called "gear axial racking", and the gears of the gear and the axial rack are composed of teeth and slots arranged in phase. The teeth of the gear are arranged circumferentially, and the axial directions of the axial racks are linearly arranged. The relationship between the two is called "biting". He,,.

Since the embodiment of the present invention does not have the guide protrusion having the anti-rotation effect as in the above-described Embodiment 1, the guide protrusion is eliminated, that is, the axial rack is directly formed on the outer side wall of the hollow guide cylinder 5, the drive gear Directly connected to the axial rack 52 on the outer side wall of the hollow guide cylinder 5 through the guiding gap, that is, the transmission gear rotates in the gap, and nothing moves in the gap, thereby increasing the axial direction of the driving device to the hollow guiding tube The scope of control.

In order to further prevent the hollow guide cylinder 5 from rotating in the circumferential direction, the outer side wall of the hollow guide cylinder 5 is further provided with an axial key groove 55 in the embodiment of the present invention, and the inner wall of the motor housing 1 is opposite to the axial key groove 55. There is a guide key 15, and the guide key 15 extends into the key groove 55. A guide rail is formed between the guide key 15 and the key groove 55, which ensures that the hollow guide bush slides smoothly in the axial direction and does not rotate in the circumferential direction. It can be understood that the position of the guide key can prevent the circumferential rotation of the hollow guide cylinder from being displaced at any angle in the circumferential direction of the motor casing (excluding the position of the guide gap). In the embodiment of the present invention, in order to further achieve a smooth effect, the motor The level of the inner wall of the housing is zero. And 180. A guide key 15 is disposed at a position, and the two guide keys 15 are symmetric with the center of the motor housing 1. Correspondingly, two key grooves 55 are disposed on the outer side wall of the hollow guide cylinder 5, so that the hollow guide cylinder 5 moves in the axial direction. Is to maintain the balance on both sides.

It can be understood that, in the embodiment of the present invention, compared with the above-mentioned Embodiment 1, the protruding structure is not present on the outer sidewall of the entire hollow guide cylinder, so that the inner wall of the motor casing does not need to be excessively processed during the production process. The hollow guide tube can be directly inserted into one end of the electrolysis housing, and it is more convenient to process the key groove on the outer wall of the hollow housing. Of course, it is not excluded to process the key groove on the inner wall of the motor housing, and the guide key is processed on the outer wall of the hollow housing. The effect of the two structures is the same, and the former processing the keyway on the outer wall of the hollow casing is more advantageous for the process.

Example 3:

As shown in FIG. 8, the embodiment of the present invention is based on the axially adjustable brushless permanent magnet motor control system of the stator core coil in the above embodiment 1, and an electronic commutator and a line switching unit are added, and the permanent magnet motor passes through The phase line connecting line switching unit, the line switching unit is also respectively connected to the electronic commutator and the AC/DC rectifying unit, and the line switching unit receives the control signal of the control unit to select to turn on the permanent magnet motor and the electronic commutator or turn on the permanent magnet motor And AC/DC rectification unit.

Specifically, as shown in FIG. 9, the switching unit includes a first terminal J1 for connecting a phase line of a permanent magnet motor, a second terminal J2 for connecting the electronic commutator, and a connection unit for connecting the AC/DC rectifier. The third terminal J3, the first terminal J1 and the second terminal J2 and the third terminal J3 respectively pass the relay 101, 102 is connected, the relays 101, 102 are controlled by the control unit. In fact, the relay 101 and the relay 102 are relay groups composed of a plurality of relays, and those skilled in the art can determine the number of relays in the relay group according to the number of phase lines of the motor. In the embodiment of the present invention, an inverter is added to realize that the same control signal of the control unit generates two different control levels, that is, the control level on the control unit is simultaneously output to the control terminal of the relay 102 and the input of the inverter. The control level is output to the control end of the relay 101 after the inverter is passed, and the relay 101 and the relay 102 are guaranteed to have different switching states in the same period of time, so that the control unit control circuit switching unit only selects to switch on the permanent magnet. The motor and electronic commutator or only the permanent magnet motor and the AC/DC rectifier unit are switched on.

Of course, in other embodiments, the line switching unit may be composed of the above relay group, each of the relay groups has a control end, each control end is respectively connected to the control unit, and then the control unit separately issues different control level control. .

The electronic commutator in the embodiment of the invention is used for converting the DC input of the power source into an AC power output, and the electronic commutator is controlled by the control unit to realize the rotation of the permanent magnet motor after the DC power source passes through the electronic commutator, and the permanent magnet The motor is used as a starter motor.

The stator core coil axially adjustable brushless permanent magnet motor control system provided in the embodiment of the invention is suitable for application in the field of automotive electronics, in particular, the problem that the starting motor and the generator must be used in the current automobile, and the embodiment of the invention is used. The stator core coil axially adjustable brushless permanent magnet motor control system, the rotor shaft of the permanent magnet motor is connected with the rotating shaft of the automobile engine, and the control unit is connected to the ECU (electronic control unit) of the automobile, when the user turns the car key The ECU transmits a start signal to the control unit, the control unit controls the operation of the electronic commutator, and the control line switching unit connects the phase line of the electronic commutator and the permanent magnet motor, and disconnects the phase line of the permanent magnet motor and the AC/DC. The connection of the rectifying unit, the power source can be a storage battery in the automobile, and the electric motor is supplied to the permanent magnet motor through the electronic commutator, and the permanent magnet motor is used as the starting motor of the automobile. At this time, the control unit can also control the servo driver driving as needed. The servo motor adjusts the position of the stator core coil to the unique coincidence point, Core coil having a permanent magnet rotor in the radial direction coincides with the largest area, greater motor torque is more conducive to start the car engine.

When the engine of the car is started, the ECU of the car sends a feedback signal of the car start to the control unit, and the control unit immediately controls the line switching unit to disconnect the permanent magnet motor phase line from the electronic commutator, and simultaneously turns on the permanent magnet motor phase line. With the AC/DC rectifying unit, since the permanent magnet motor is connected to the rotating shaft of the automobile engine, the rotating shaft of the automobile engine is used as the power shaft to drive the rotor of the permanent magnet motor to rotate. For the use of the automobile generator, the working principle of the generator control part can be referred to the specific description in the above embodiment 1, and will not be described here. It can be understood that the DC output of the AC/DC rectifier unit can supply power to the vehicle onboard system. Charging the car's battery to maximize energy use.

It can be seen that, in the embodiment of the present invention, under the premise of not changing the structural design of the existing automobile internal combustion engine on a large scale, the integrated design of the permanent magnet motor as the starting motor and the generator on the automobile engine has the advantage that the conventional motor cannot be realized. For example: High-efficiency energy conversion applications for vehicle start-up and power generation; due to the absence of mechanical brushes, higher service life and reliability; at the same time small size, light weight, few components, and price advantage. Market and technology values are revolutionary.

The above description of the stator core coil axially adjustable brushless permanent magnet motor control provided by the embodiment of the present invention is provided, and the description of the above embodiment is only for helping to understand the method and core idea of the present invention; The present invention is not limited by the scope of the present invention, and the details of the present invention are not limited by the scope of the present invention.

Claims

Claim

A stator core-coil axially adjustable brushless permanent magnet motor, comprising: a motor housing, a permanent magnet rotor rotatably mounted in the motor housing, and a stator core formed by winding a coil on the core The coil, the stator core coil is axially movably mounted on the inner wall of the motor housing, and the stator core coil is axially moved along the inner wall of the motor housing by a driving device to change the effective magnetic flux of the permanent magnet rotor on the coil winding thereof. .

2 . The stator core coil axially adjustable brushless permanent magnet motor according to claim 1 , wherein a sidewall of the motor housing is axially opened with a guiding gap, and the stator core coil is fixed in a fixing device and fixed. A driving connection portion for connecting the driving device is disposed at a position of the outer side wall of the device opposite to the guiding gap. The driving device drives the driving connection portion to reciprocate in the axial direction through the guiding slit, and the driving connecting portion is integrally coupled with the fixing device.

The stator core-coil axially adjustable brushless permanent magnet motor according to claim 2, wherein the fixing device is a hollow guide cylinder with open ends, and the stator core coil is embedded in the hollow guide cylinder and hollow The guide cylinder is integrally moved, and the driving connection portion is an axial rack disposed on an outer side wall of the hollow guide cylinder; the driving device is a driving gear that meshes with the axial rack.

The stator core coil axially adjustable brushless permanent magnet motor according to claim 2 or 3, wherein the outer side wall of the fixing device is further provided with an axial key groove, the inner wall of the motor housing and the axial key groove Guide keys are provided at opposite positions, and the guide keys extend into the key grooves.

The stator core-coil axially adjustable brushless permanent magnet motor according to claim 2, wherein the fixing device is a hollow guide cylinder opened at both ends, and the stator core coil is embedded in the hollow guide cylinder and hollow The driving guide is integrally moved. The driving connecting portion is a guiding protrusion disposed on the outer wall of the hollow guiding tube and extending radially into the guiding slit. The upper surface of the guiding protrusion is provided with an axial rack; the driving device is a guiding and guiding device A drive gear in which the axial racks of the raised upper surface intermesh with each other.

The stator core-coil axially adjustable brushless permanent magnet motor according to claim 5, wherein The outer wall of the hollow guide bush is provided with another guiding protrusion symmetrical with the guiding protrusion, and an axial guiding IHJ groove corresponding to the other guiding protrusion on the inner wall of the motor housing, the other guiding protrusion It is placed in the guide IHJ slot and can move along the guide groove in the axial direction.

The stator core-coil axially adjustable brushless permanent magnet motor according to claim 3 or 5 or 6, wherein the driving device further comprises a servo motor, and the driving is mounted on an output shaft of the servo motor gear.

The stator core-coil axially adjustable brushless permanent magnet motor according to claim 4, wherein the driving device further comprises a servo motor, and the driving gear is mounted on an output rotating shaft of the servo motor.

A stator core-coil axially adjustable brushless permanent magnet motor control system, comprising: an AC/DC rectifying unit, a control unit, a voltage sampling unit, and the method according to any one of claims 1 to 8 The stator core coil axially adjustable brushless permanent magnet motor, the driving device is a servo driving device, and the motor phase line of the stator core coil axially adjustable brushless permanent magnet motor is connected to the input end of the AC/DC rectifying unit, the voltage 釆The output voltage of the sample unit AC/DC rectification unit is transmitted to the control unit, and the control unit controls the output of the servo drive unit.

10 . The stator core coil axially adjustable brushless permanent magnet motor control system according to claim 9 , further comprising an electronic commutator and a line switching unit, wherein the brushless permanent magnet motor is connected through a phase line thereof. The line switching unit, the line switching unit is further connected to the electronic commutator and the AC/DC rectifying unit, respectively, and the line switching unit receives the control signal of the control unit to select to turn on the brushless permanent magnet motor and the electronic commutator or select to turn on the Brush permanent magnet motor and AC/DC rectifier unit.

The control system for an axially adjustable brushless permanent magnet motor of a stator core coil according to claim 10, wherein the switching unit comprises a first terminal for connecting a phase line of the permanent magnet motor for connecting a second terminal of the electronic commutator, and a third terminal for connecting the AC/DC rectifying unit, wherein the first terminal is respectively connected to the second terminal and the third terminal by a relay, and the relay is controlled by the control unit Control.

The stator core coil axially adjustable brushless permanent magnet motor control system according to claim 9 or 10, wherein the voltage sampling unit comprises a comparator, and a comparator terminal of the comparator is connected to the reference voltage reference The other comparator of the comparator is connected to the output voltage of the AC/DC rectifier unit, and the output of the comparator is connected to the control unit.

The stator core coil axially adjustable brushless permanent magnet motor control system according to claim 9 or 10, wherein the voltage sampling unit is a voltage dividing sampling circuit formed by a plurality of series resistors grounded , the partial pressure on one of the voltage dividing resistors is connected to the control unit.