Motor system with holding function

Abstract

The invention provides a motor system with a holding function. The motor system comprises a stator core, a stator winding, a stator winding end package, a rotor permanent magnet, a rotor core, a rotating shaft, a mechanical spring and an armature, the rotor iron core and the armature are fixed on the rotating shaft, and the rotor permanent magnet is fixed on the rotor iron core; the stator winding is fixed on the stator iron core; the stator winding and the stator iron core surround the periphery of the rotor permanent magnet and the rotor iron core; the stator winding end part package is positioned at the end part position of the stator winding extending out of the axial section of the stator iron core, and wraps the end part of the stator winding; and the stator winding end package is connected with the armature through the mechanical spring. For a driving system needing a positioning and holding function, electromagnetic actuation is achieved through the winding, and mechanical holding is achieved through the spring and the armature.

Description

Technical Field

[0001] The present invention relates to the technical field of motor equipment, and specifically, to a motor system with a holding function, and in particular, to a motor drive system integrating a magnetic leakage utilization type electromagnetic actuator. Background Art

[0002] With the continuous improvement of the national industrialization level and the increasingly urgent need for the transformation and upgrading of the equipment manufacturing industry towards low resource consumption, low pollution emissions, and high economic benefits, intelligent manufacturing has received great attention from the government and enterprises.

[0003] In various types of intelligent manufacturing scenarios, the motor drive system, as the power source of the equipment, can achieve the efficient, stable, and precise operation of various workpieces, toolings, and equipment. In the motor drive system, the rotary motor is widely used due to its advantages of compact structure, convenient installation, strong adaptability, and diverse models. The rotating shaft of the rotary motor is connected to the rear-end load to transmit the tangential force, that is, torque, to drive the rear-end load to rotate synchronously.

[0004] However, in some application scenarios of numerical control machine tools and robots, in addition to driving the load to rotate, the rotary motor also needs to complete the holding function within some time periods, that is, to lock the rear-end load and keep it stationary, and prevent the load from rotating and jittering passively due to external disturbances; in addition, under certain working conditions, the motor drive system is also required to have a braking function, that is, when the motor drives the load to rotate at a high speed, according to the system command, the motor and the load need to stop immediately.

[0005] To meet the above requirements, currently, the motor drive system usually adds a dedicated braking and holding device outside the rotary motor. The braking and holding device uses a dedicated electromagnetic coil to apply current to generate electromagnetic force to drive the armature to achieve frictional braking and holding. However, this method requires an additional dedicated braking device and an electromagnetic coil control system, with low integration, complex device, and large volume. In addition, there are also solutions to achieve the braking and holding function by using the rotary motor itself. When the motor needs to stop and hold, by reasonably controlling the current of the motor winding, appropriate reverse torque and holding torque are achieved to match the rear-end load and realize the holding function of the motor drive system. However, this method requires a long-term current input in the holding state, with large copper losses and low efficiency, and the reverse torque and holding torque of the motor are often small, which is not sufficient to achieve the fast dynamic response of the braking action and the stability and anti-interference of the holding action.

[0006] The patent document with the publication number WO2021031333A1 discloses a permanent magnet brake structure for a permanent magnet synchronous motor. This structure includes a rotor permanent magnet shared by the rotor and the brake, a toroidal coil embedded in the motor end cover and axially facing the rotor permanent magnet, and a pressure plate and an armature located in the axial space between the coil and the permanent magnet. However, the structure disclosed in this patent document is only applicable to permanent magnet synchronous motors and requires the use of the rotor permanent magnet to provide an axial magnetic field. In addition, the structure disclosed in this patent document requires an additional set of toroidal windings to cooperate with the permanent magnet to complete magnetic field regulation and achieve the tightening and loosening of the armature. In the structure disclosed in this patent document, the displacement direction of the armature is the axial direction, with a small contact area, occupying axial space, and limited braking effect. Summary of the Invention

[0007] Aiming at the defects in the prior art, the purpose of the present invention is to provide a motor drive system integrating a leakage magnetic flux utilization type electromagnetic actuator.

[0008] A motor drive system integrating a leakage magnetic flux utilization type electromagnetic actuator according to the present invention includes: a stator core, a stator winding, a stator winding end encapsulation, a rotor permanent magnet, a rotor core, a rotating shaft, a mechanical spring, and an armature;

[0009] The rotor core and the armature are fixed to the rotating shaft, and the rotor permanent magnet is fixed to the rotor core;

[0010] The stator winding is fixed to the stator core, and the stator winding and the stator core surround the rotor permanent magnet and the rotor core;

[0011] The stator winding end encapsulation is located at the end position of the stator winding extending out of the axial section of the stator core and wraps the end of the stator winding;

[0012] The stator winding end encapsulation is connected to the armature through the mechanical spring.

[0013] Preferably, both the stator core and the rotor core are made of a magnetic conductive material structure;

[0014] The stator core, the stator winding, the rotor permanent magnet, and the rotor core together with the rotating shaft constitute a radial magnetic field type rotating motor;

[0015] The stator core and the stator winding are stationary components;

[0016] When a current is applied to the stator winding, the rotor permanent magnet and the rotor core can rotate tangentially on the rotating shaft.

[0017] Preferably, both the stator winding end encapsulation and the armature are made of a magnetic conductive material structure;

[0018] The stator winding, the end encapsulation of the stator winding, the rotating shaft, the mechanical spring, and the armature together constitute an electromagnetic actuator;

[0019] The stator winding and the end encapsulation of the stator winding are stationary components;

[0020] When there is no current in the stator winding, the end encapsulation of the stator winding has no electromagnetic force on the armature, the mechanical spring is in a stretched state, the armature has mechanical contact with the rotating shaft, and the rotating shaft is blocked by friction. At this time, the rotating shaft enters the holding or braking state;

[0021] When a current is applied to the stator winding, the end encapsulation of the stator winding has an electromagnetic force on the armature, and the armature moves radially outward until it balances with the spring force of the mechanical spring. At this time, the mechanical spring is in a contracted state, the armature has no mechanical contact with the rotating shaft, and the rotating shaft can rotate.

[0022] Preferably, the radial magnetic field type rotating motor and the electromagnetic actuator are distributed in different axial spaces;

[0023] The radial magnetic field type rotating motor and the electromagnetic actuator share the stator winding. The electromagnetic actuator is located in the axial end interval of the stator winding, and there is an axial gap with the axial interval of the radial magnetic field type rotating motor.

[0024] Preferably, the magnetic field generated by the stator winding can act on both the radial magnetic field type rotating motor and the electromagnetic actuator simultaneously;

[0025] The main magnetic field generated by the stator winding acts on the radial magnetic field type rotating motor to realize the tangential rotational movement of the radial magnetic field type rotating motor;

[0026] The end leakage magnetic field generated by the stator winding acts on the electromagnetic actuator to complete the radial displacement of the armature, separate the armature from the rotating shaft, and enable the rotating shaft to rotate freely;

[0027] When the stator winding is powered off from the energized state, the armature loses the electromagnetic force, and under the action of the force of the mechanical spring, it makes mechanical contact with the rotating shaft, and the rotating shaft will be braked and stopped by friction.

[0028] Preferably, the end encapsulation of the stator winding is a soft magnetic composite material structure.

[0029] Preferably, the radial magnetic field type rotating motor adopts an outer rotor configuration or an inner rotor configuration;

[0030] The radial magnetic field type rotating electrical machine adopts any one of the following types: synchronous electrical machine type, asynchronous electrical machine type, reluctance electrical machine type.

[0031] Preferably, the stator winding is single-phase or multi-phase;

[0032] The stator winding adopts a concentrated winding or a distributed winding.

[0033] Preferably, the load current of the stator winding adopts any one of the following types: sine wave type, bipolar square wave type, unipolar square wave type.

[0034] Preferably, the rotor permanent magnet adopts any one of the following structures: surface-mounted structure, surface-inserted structure, embedded structure.

[0035] Compared with the prior art, the present invention has the following beneficial effects:

[0036] 1. The structure of the present invention integrates an electromagnetic actuator and a rotating electrical machine into one body, and the two share the same set of windings. After the windings are loaded with current, the main magnetic field generated causes the rotor of the electrical machine to rotate tangentially, and the end leakage magnetic field generated causes the armature of the electromagnetic actuator to actuate and release the rotating shaft; correspondingly, the structure of the present invention has a high integration degree, is compact and small, has a simple and compact structure, occupies less space, and is light in weight.

[0037] 2. When the rotor system of the present invention needs to be kept stationary, only the winding current needs to be removed. At this time, there is no electromagnetic force acting on the armature, but the spring tension will cause the armature to be in close contact with the rotating shaft, and the corresponding mechanical friction locks the rotating shaft to resist external disturbances. No current needs to be loaded in this holding state, and the system has no copper loss and high efficiency.

[0038] 3. The structure of the present invention adopts a permanent magnet rotor, which can generate a strong magnetic field and enable the electrical machine to rotate efficiently.

[0039] 4. The motor drive system of the integrated leakage magnetic field utilization type electromagnetic actuator described in the present invention has strong applicability, and can flexibly select the number of motor phases, the combination of slots and poles, the winding type, the core material, the permanent magnet material, the number of blocks for encapsulating the stator winding end, the number of springs, and the number of armatures. Description of the Drawings

[0040] By reading the detailed description of the non-limiting embodiments with reference to the following drawings, other features, objects, and advantages of the present invention will become more apparent:

[0041] Figure 1 It is a side view of the overall structure of the motor drive system of the integrated leakage magnetic field utilization type electromagnetic actuator described in the present invention.

[0042] Figure 2Cross-sectional view of the rotating motor of the motor drive system of the integrated magnetic leakage utilization type electromagnetic actuator according to the present invention.

[0043] Figure 3 Cross-sectional view of the electromagnetic actuator of the motor drive system of the integrated magnetic leakage utilization type electromagnetic actuator according to the present invention.

[0044] Figure 4 Schematic diagrams of two typical operating states of the motor drive system of the integrated magnetic leakage utilization type electromagnetic actuator according to the present invention, where Figure 4 (a) is a schematic diagram of the rotating state, Figure 4 (b) is a schematic diagram of the holding state.

[0045] Reference numerals:

[0046] Stator core 1, Rotor core 5

[0047] Stator winding 2, Rotating shaft 6

[0048] Stator winding end encapsulation 3, Mechanical spring 7

[0049] Rotor permanent magnet 4, Armature 8 Detailed implementation manners

[0050] The present invention will be described in detail below with reference to specific embodiments. The following embodiments will help those skilled in the art to further understand the present invention, but do not limit the present invention in any form. It should be noted that for those of ordinary skill in the art, without departing from the concept of the present invention, several changes and improvements can still be made. These all fall within the protection scope of the present invention.

[0051] Example 1

[0052] As Figures 1 to 4 shown, this embodiment provides a motor system with a holding function, including: a stator core 1, a stator winding 2, a stator winding end encapsulation 3, a rotor permanent magnet 4, a rotor core 5, a rotating shaft 6, a mechanical spring 7, and an armature 8; the rotor core 5 and the armature 8 are fixed on the rotating shaft 6, and the rotor permanent magnet 4 is fixed on the rotor core 5; the stator winding 2 is fixed on the stator core 1, and the stator winding 2 and the stator core 1 surround the rotor permanent magnet 4 and the rotor core 5; the stator winding end encapsulation 3 is located at the end position of the axial interval where the stator winding 2 extends out of the stator core 1 and wraps the end of the stator winding 2; the stator winding end encapsulation 3 is connected to the armature 8 through the mechanical spring 7.

[0053] Both the stator winding end encapsulation 3 and the armature 8 are made of magnetically permeable materials; the stator winding 2, the stator winding end encapsulation 3, the rotating shaft 6, the mechanical spring 7, and the armature 8 together form an electromagnetic actuator; the stator winding 2 and the stator winding end encapsulation 3 are stationary components; when there is no current in the stator winding 2, the stator winding end encapsulation 3 has no electromagnetic force on the armature 8, the mechanical spring 7 is in an extended state, the armature 8 has mechanical contact with the rotating shaft 6, and the rotating shaft 6 is locked by friction, and at this time the rotating shaft 6 enters the holding or braking state; when a current is applied to the stator winding 2, the stator winding end encapsulation 3 has an electromagnetic force on the armature 8, and the armature 8 displaces radially outward until it balances with the spring force of the mechanical spring 7. At this time, the mechanical spring 7 is in a contracted state, the armature 8 has no mechanical contact with the rotating shaft 6, and the rotating shaft 6 can rotate. Both the stator core 1 and the rotor core 5 are made of magnetically permeable materials; the stator core 1, the stator winding 2, the rotor permanent magnet 4, and the rotor core 5 together with the rotating shaft 6 form a radial magnetic field type rotating motor; the stator core 1 and the stator winding 2 are stationary components; when a current is applied to the stator winding 2, the rotor permanent magnet 4 and the rotor core 5 can rotate tangentially on the rotating shaft 6.

[0054] The magnetic field generated by the stator winding 2 can act on both the radial magnetic field type rotating motor and the electromagnetic actuator at the same time; the main magnetic field generated by the stator winding 2 acts on the radial magnetic field type rotating motor to realize the tangential rotational movement of the radial magnetic field type rotating motor; the end leakage magnetic field generated by the stator winding 2 acts on the electromagnetic actuator to complete the radial displacement of the armature 8, separate the armature 8 from the rotating shaft 6, and enable the rotating shaft 6 to rotate freely; when the stator winding 2 is powered off from the energized state, the armature 8 loses the electromagnetic force and is mechanically contacted with the rotating shaft 6 by the force of the mechanical spring 7, and the rotating shaft 6 will be braked and stopped by friction. The radial magnetic field type rotating motor and the electromagnetic actuator are distributed in different axial spaces; the radial magnetic field type rotating motor and the electromagnetic actuator share the stator winding 2, and the electromagnetic actuator is located in the axial end interval of the stator winding 2, and there is an axial gap with the axial interval of the radial magnetic field type rotating motor.

[0055] The stator winding end encapsulation 3 is made of soft magnetic composite materials. The radial magnetic field type rotating motor adopts an outer rotor configuration or an inner rotor configuration; the radial magnetic field type rotating motor adopts any one of the following types: synchronous motor type, asynchronous motor type, reluctance motor type. The stator winding 2 is single-phase or multi-phase; the stator winding 2 adopts a concentrated winding or a distributed winding. The current applied to the stator winding 2 adopts any one of the following types: sine wave type, bipolar square wave type, unipolar square wave type. The rotor permanent magnet 4 adopts any one of the following structures: surface-mounted structure, surface-inserted structure, embedded structure.

[0056] Example 2

[0057] Those skilled in the art can understand this embodiment as a more specific illustration of Embodiment 1.

[0058] This embodiment provides a motor drive system integrating a magnetic flux leakage utilization type electromagnetic actuator, which includes a stator core 1, a stator winding 2, a stator winding end encapsulation 3, a rotor permanent magnet 4, a rotor core 5, a rotating shaft 6, a mechanical spring 7, and an armature 8.

[0059] The stator winding 2 is fixed on the stator core 1, and the rotor permanent magnet 4 is fixed on the rotor core 5 and further fixed on the rotating shaft 6; the stator winding end encapsulation 3 is located at the end position of the axial section where the stator winding 2 extends out of the stator core 1, wrapping the end of the stator winding 2, and the mechanical spring 7 is mechanically connected to both the stator winding end encapsulation 3 and the armature 8.

[0060] The stator core 1 and the rotor core 5 are made of magnetic conductive materials. The stator core 1, the stator winding 2, the rotor permanent magnet 4, the rotor core 5, and the rotating shaft 6 together form a radial magnetic field type rotating motor, where the stator core 1 and the stator winding 2 are stationary components. When a current is applied to the stator winding 2, the rotor permanent magnet 4, the rotor core 5, and the rotating shaft 6 can rotate tangentially.

[0061] The stator winding end encapsulation 3 and the armature 8 are both made of magnetic conductive materials. The stator winding 2, the stator winding end encapsulation 3, the rotating shaft 6, the mechanical spring 7, and the armature 8 together form an electromagnetic actuator, where the stator winding 2 and the stator winding end encapsulation 3 are stationary components; when there is no current in the stator winding 2, there is no electromagnetic force, the mechanical spring 7 is in an extended state, the armature 8 is in mechanical contact with the rotating shaft 6, and the rotating shaft is locked by friction to prevent tangential rotation. At this time, the rotating shaft enters the holding or braking state; when a current is applied to the stator winding 2, the stator winding end encapsulation 3 exerts an electromagnetic force on the armature 8, and the armature 8 moves radially outward until it balances with the spring force. At this time, the mechanical spring 7 is in a contracted state, the armature 8 is not in mechanical contact with the rotating shaft 6, and the rotating shaft can rotate.

[0062] The radial magnetic field type rotating motor and the electromagnetic actuator are distributed in different axial spaces, but they share the same stator winding 2, where the electromagnetic actuator is located in the axial end section of the stator winding 2 and there is an axial gap with the axial section of the motor.

[0063] The magnetic field generated by the stator winding 2 can act on both the motor and the electromagnetic actuator at the same time. Among them, the main magnetic field acts on the motor to realize the tangential rotational movement of the motor; the end leakage magnetic field acts on the electromagnetic actuator to complete the radial displacement of the armature, separating the armature from the rotating shaft and ensuring that the rotating shaft can rotate freely; when the armature winding is powered off from the energized state, the armature loses the electromagnetic force and will be in mechanical contact with the rotating shaft under the action of the spring force, and the corresponding friction force will brake the rotating shaft and stop it quickly.

[0064] The end encapsulation 3 of the stator winding can adopt a Soft Magnetic Composite (SMC) with high magnetic permeability and good shape adaptability to enhance the magnetic conduction effect and magnetic field strength, and improve the armature displacement effect of the electromagnetic actuator.

[0065] The radial magnetic field type rotating motor can adopt an outer rotor configuration or an inner rotor configuration, and can adopt the form of a synchronous motor, an asynchronous motor or a reluctance motor. The stator winding 2 can be single-phase or multi-phase, the stator winding 2 can adopt a concentrated winding or a distributed winding, the applied current can adopt the form of a sine wave, a bipolar square wave or a unipolar square wave, and the rotor permanent magnet 4 can adopt a surface-mounted, surface-inserted or embedded structure.

[0066] This embodiment provides a motor system with a holding function, including: a stator core, a stator winding, an end encapsulation of the stator winding, a rotor permanent magnet, a rotor core, a rotating shaft, a mechanical spring and an armature; the rotor core and the armature are fixed on the rotating shaft, and the rotor permanent magnet is fixed on the rotor core; the stator winding is fixed on the stator core, and the stator winding and the stator core surround the rotor permanent magnet and the rotor core; the end encapsulation of the stator winding is located at the end position of the axial section where the stator winding extends out of the stator core and wraps the end of the stator winding; the end encapsulation of the stator winding is connected to the armature through a mechanical spring.

[0067] This embodiment is directed to a drive system that requires a positioning and holding function, uses the winding to achieve electromagnetic actuation, and uses the spring and the armature to achieve mechanical holding.

[0068] Example 3

[0069] Those skilled in the art can understand this embodiment as a more specific description of Embodiment 1.

[0070] This embodiment provides a motor drive system integrating a leakage magnetic flux utilization type electromagnetic actuator, including a stator core 1, a stator winding 2, an end encapsulation 3 of the stator winding, a rotor permanent magnet 4, a rotor core 5, a rotating shaft 6, a mechanical spring 7 and an armature 8.

[0071] The rotor permanent magnet 4 is fixed to the rotor core 5 and further fixed to the rotating shaft 6. Together, they form the rotor system, which is the rotating component of the system. The stator winding 2 is fixed to the stator core 1. They are stationary components and, together with the rotor system, form a radial magnetic field rotating motor. The stator winding end encapsulation 3 is located at the end position of the axial section where the stator winding 2 extends out of the stator core 1, wrapping the end of the stator winding 2 and being a stationary component. Both ends of the mechanical spring 7 are mechanically connected to the stator winding end encapsulation 3 and the armature 8 respectively. The mechanical spring 7 and the armature 8 are operating components and can move linearly in the radial direction. The stator winding 2, the stator winding end encapsulation 3, the mechanical spring 7, the armature 8 and the rotating shaft 6 together form an electromagnetic actuator.

[0072] Furthermore, both the stator core 1 and the rotor core 5 are made of magnetic conductive materials. When current is applied to the stator winding 2, the rotor system can rotate tangentially.

[0073] Furthermore, both the stator winding end encapsulation 3 and the armature 8 are made of magnetic conductive materials. When current is applied to the stator winding 2, an electromagnetic force acts on the armature 8 by the stator winding end encapsulation 3. The armature 8 moves radially outwards until it balances with the spring force. At this time, the mechanical spring 7 is in a contracted state, and there is no mechanical contact between the armature 8 and the rotating shaft 6, and the rotor system can rotate. When the current in the stator winding 2 is removed, there is no electromagnetic force. The mechanical spring 7 is in an extended state, and the armature 8 contacts the rotating shaft 6, using the frictional force to lock the rotating shaft and the rotor system stops rotating, entering the holding or braking state.

[0074] Furthermore, the number of slots of the motor stator core 1 and the number of poles of the rotor permanent magnet 4 can be flexibly selected.

[0075] Furthermore, the number of phases of the motor stator winding 2 can be flexibly selected.

[0076] Furthermore, the stator winding 2 can be a concentrated winding or a distributed winding.

[0077] Furthermore, the current applied to the stator winding 2 can be a sinusoidal current, a bipolar square wave current, a unipolar square wave current or a customized current waveform.

[0078] Furthermore, the rotor permanent magnet 4 can adopt a surface-mounted, surface-inserted or embedded structure.

[0079] Furthermore, the motor type can be a permanent magnet synchronous motor, or other types such as an electrically excited synchronous motor, an induction motor, a reluctance motor, etc.

[0080] Furthermore, the number of the mechanical spring 7 and the armature 8 can be flexibly selected.

[0081] Furthermore, the stator winding end encapsulation 3 can adopt a soft magnetic composite material with good magnetic conductivity and shape processing freedom.

[0082] Furthermore, the stator winding end encapsulation 3 can be made of a soft magnetic composite material with good magnetic permeability and high freedom in shape processing.

[0083] Furthermore, the stator winding end encapsulation 3, the mechanical spring 7, and the armature 8 can be located only at one end of the motor stator winding 2, or can be located at both ends of the stator winding 2 simultaneously.

[0084] For a motor drive system that needs to maintain the brake function, aiming at the problems of complex structure, low compactness, and low holding force in the existing solutions, this embodiment proposes a solution for a motor drive system integrating a leakage magnetic field utilization type electromagnetic actuator without adding extra coils. On the basis of ensuring the normal rotational motion ability of the motor, the leakage magnetic field at the end of the motor winding is utilized to realize the movement of the armature of the electromagnetic actuator, and then the switching between the brake holding and free rotation of the drive system shaft is realized. Therefore, the solution can realize the reliable, fast, efficient, and stable braking and holding functions of the drive system without adding extra electromagnetic coils.

[0085] Example 4

[0086] Those skilled in the art can understand this embodiment as a more specific description of Embodiment 1.

[0087] This embodiment provides a motor drive system integrating a leakage magnetic field utilization type electromagnetic actuator, as Figure 1 shown, including: a stator core 1 and a stator winding 2, where the stator winding 2 is placed on the stator core 1, and they are stationary components; a rotor permanent magnet 4, a rotor core 5, and a rotating shaft 6, where the rotor permanent magnet 4 is located on the rotor core 5, and the rotor core 5 is placed on the rotating shaft 6, and they together form a set of rotor systems, which are rotating components; a stator winding end encapsulation 3 is located at the axial end of the stator winding 2 and wraps it, a mechanical spring 7 is located between the stator winding end encapsulation 3 and the armature 8 and is mechanically connected to both; the armature 8 is located radially outside the rotating shaft 6. When the mechanical spring 7 is in the extended state, the armature is affected by the spring tension and has mechanical contact with the rotating shaft 6; when the mechanical spring 7 is in the contracted state, the armature moves radially outward and has no mechanical contact with the rotating shaft 6.

[0088] In this embodiment, the stator core 1, the rotor core 5, and the stator winding end encapsulation 3 are all made of magnetic conductive materials, and the stator winding end encapsulation 3 is made of a soft magnetic composite material with good magnetic permeability and shape adaptability.

[0089] In this embodiment, the stator core 1, the stator winding 2, the rotor permanent magnet 4, the rotor core 5, and the rotating shaft 6 together form a radial magnetic field type rotating motor, as Figure 2As shown in the figure. Among them, the motor stator core 1 has a 24-slot structure, the stator winding 2 has a distributed winding structure, and the rotor permanent magnet 4 has a 4-pole structure and is surface-mounted on the rotor core 5.

[0090] In this embodiment, the stator winding 2, the stator winding end encapsulation 3, the rotating shaft 6, the mechanical spring 7 and the armature 8 together constitute an electromagnetic actuator, as Figure 3 shown in the figure. Among them, the number of blocks of the stator winding end encapsulation 3, the number of mechanical springs 7, and the armature 8 are all 4.

[0091] When the system needs the rotor system to rotate and drive the rear load, a suitable current can be applied to the stator winding 2. The main magnetic field generated by it interacts with the magnetic field generated by the rotor permanent magnet 4 to generate an electromagnetic torque, causing the rotor system (including the rotor permanent magnet 4, the rotor core 5, and the rotating shaft 6) to rotate tangentially. At the same time, the end leakage magnetic field generated after the stator winding 2 is energized generates an electromagnetic force between the stator winding end encapsulation 3 and the armature 8. This electromagnetic force partially cancels the tension of the mechanical spring 7, causing the armature 8 to move radially outward away from the rotating shaft 6. There is no mechanical contact between the two, and the spring enters the contraction state, that is, it enters the Figure 4 (a) shown rotating state.

[0092] When the system needs the rotor system to stop rotating as soon as possible or enter the stable holding state, that is, when the rotor system is stationary, the current of the stator winding 2 can be removed. At this time, there is no electromagnetic force between the stator winding end encapsulation 3 and the armature 8. The armature 8 is affected by the tension of the mechanical spring 7 and will move radially inward towards the rotating shaft 6. There is mechanical contact between the two, and the spring enters the stretching state. The armature 8 is in close contact with the rotating shaft 6, and the rotating shaft 6 is locked, that is, it enters the Figure 4 (b) shown holding state. At the same time, since there is no current in the stator winding 2, no electromagnetic torque is generated either.

[0093] Example 5

[0094] The difference between this embodiment and Embodiment 4 is that the rotor permanent magnet in this embodiment is of an embedded structure and is placed inside the rotor core, forming an embedded permanent magnet synchronous motor rotor structure.

[0095] Other settings in this embodiment are the same as those in Embodiment 1.

[0096] Example 6

[0097] The difference between this embodiment and Embodiment 4 is that this embodiment has no rotor permanent magnet, but uses a rotor cage winding to replace the rotor permanent magnet, and the rotor cage winding is placed inside the rotor core, forming an asynchronous motor cage rotor structure.

[0098] Other settings in this embodiment are the same as those in Embodiment 1.

[0099] The present invention is directed to a drive system that requires a positioning and holding function, and uses windings to achieve electromagnetic actuation and uses springs and armatures to achieve mechanical holding.

[0100] In the description of the present application, it should be understood that the orientation or positional relationship indicated by the terms "upper", "lower", "front", "rear", "left", "right", "vertical", "horizontal", "top", "bottom", "inner", "outer", etc. is based on the orientation or positional relationship shown in the drawings, and is only for the convenience of describing the present application and simplifying the description, rather than indicating or implying that the device or element referred to must have a specific orientation, be constructed and operated in a specific orientation, and therefore should not be construed as a limitation to the present application.

[0101] The specific embodiments of the present invention have been described above. It should be understood that the present invention is not limited to the above specific embodiments, and those skilled in the art can make various changes or modifications within the scope of the claims, which do not affect the essence of the present invention. Without conflict, the embodiments of the present application and the features in the embodiments can be arbitrarily combined with each other.

Claims

1. A motor system with a holding function, characterized in that, Comprising: A stator core (1), a stator winding (2), a stator winding end encapsulation (3), a rotor permanent magnet (4), a rotor core (5), a rotating shaft (6), a mechanical spring (7), and an armature (8); The rotor core (5) and the armature (8) are fixed to the rotating shaft (6), and the rotor permanent magnet (4) is fixed to the rotor core (5); The stator winding (2) is fixed to the stator core (1), and the stator winding (2) and the stator core (1) surround the periphery of the rotor permanent magnet (4) and the rotor core (5); The stator winding end encapsulation (3) is located at the end position of the axial interval where the stator winding (2) extends out of the stator core (1), and wraps the end of the stator winding (2); The stator winding end encapsulation (3) is connected to the armature (8) through the mechanical spring (7).

2. The motor system with a holding function according to claim 1, characterized in that, Both the stator core (1) and the rotor core (5) are made of magnetic conductive materials; The stator core (1), the stator winding (2), the rotor permanent magnet (4), and the rotor core (5) together with the rotating shaft (6) form a radial magnetic field type rotating motor; The stator core (1) and the stator winding (2) are stationary components; When a current is applied to the stator winding (2), the rotor permanent magnet (4) and the rotor core (5) can rotate tangentially on the rotating shaft (6).

3. The motor system with a holding function according to claim 2, characterized in that Both the stator winding end encapsulation (3) and the armature (8) are made of magnetic conductive materials; The stator winding (2), the stator winding end encapsulation (3), the rotating shaft (6), the mechanical spring (7), and the armature (8) together form an electromagnetic actuator; The stator winding (2) and the stator winding end encapsulation (3) are stationary components; When there is no current in the stator winding (2), the stator winding end encapsulation (3) has no electromagnetic force on the armature (8), the mechanical spring (7) is in an extended state, the armature (8) has mechanical contact with the rotating shaft (6), and the rotating shaft (6) is blocked by friction, and at this time the rotating shaft (6) enters a holding or braking state; When a current is applied to the stator winding (2), the stator winding end encapsulation (3) has an electromagnetic force on the armature (8), the armature (8) moves radially outwards until it balances with the spring force of the mechanical spring (7), at this time the mechanical spring (7) is in a contracted state, the armature (8) has no mechanical contact with the rotating shaft (6), and the rotating shaft (6) can rotate.

4. The motor system with a holding function according to claim 3, characterized in that, The radial magnetic field type rotating motor and the electromagnetic actuator are distributed in different axial spaces; The radial magnetic field type rotating motor and the electromagnetic actuator share the stator winding (2), and the electromagnetic actuator is located in the axial end interval of the stator winding (2), and there is an axial gap with the axial interval of the radial magnetic field type rotating motor.

5. The motor system with a holding function according to claim 3, characterized in that, The magnetic field generated by the stator winding (2) can act on both the radial magnetic field type rotating motor and the electromagnetic actuator simultaneously; The main magnetic field generated by the stator winding (2) acts on the radial magnetic field type rotating motor to achieve the tangential rotational motion of the radial magnetic field type rotating motor; The end leakage magnetic field generated by the stator winding (2) acts on the electromagnetic actuator to complete the radial displacement of the armature (8), separate the armature (8) from the rotating shaft (6), and enable the rotating shaft (6) to rotate freely; When the stator winding (2) is powered off from the energized state, the armature (8) loses the action of the electromagnetic force and mechanically contacts the rotating shaft (6) under the action of the mechanical spring (7), and the rotating shaft (6) will be braked and stopped by the frictional force.

6. The motor system with a holding function according to claim 1, wherein The stator winding end package (3) is a soft magnetic composite material structure.

7. The motor system with a holding function according to claim 1, characterized in that, The radial magnetic field type rotating motor adopts an outer rotor configuration or an inner rotor configuration; The radial magnetic field type rotating motor adopts any one of the following types: synchronous motor type, asynchronous motor type, reluctance motor type.

8. The motor system with a holding function according to claim 1, characterized in that, The stator winding (2) is single-phase or multi-phase; The stator winding (2) adopts a concentrated winding or a distributed winding.

9. The motor system with a holding function according to claim 1, characterized in that, The load current of the stator winding (2) adopts any one of the following types: sine wave type, bipolar square wave type, unipolar square wave type.

10. The motor system with a holding function according to claim 1, characterized in that, The rotor permanent magnet (4) adopts any one of the following structures: surface-mounted structure, surface-inserted structure, embedded structure.

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