A closed-loop stepper motor

Abstract

The invention discloses a closed-loop stepping motor, including a housing, a stator assembly, a rotor assembly, a rotor detection assembly, a stator detection assembly and a rotor shaft, wherein the rotor shaft is fixedly assembled with the rotor assembly, and the rotor assembly is installed in the stator assembly; the rotor detection assembly includes a rotor detection pole and is wound with a rotor detection coil, and the stator detection assembly includes a stator detection pole and is wound with a stator detection coil; the rotor detection assembly is fixedly assembled with the rotor shaft, the stator detection assembly is fixedly assembled with the housing, and the rotor detection assembly is arranged inside the stator detection assembly. The invention utilizes the principle of electromagnetic induction to convert the position signal of the motor into two groups of waveform signals with a certain phase difference, and then obtains a group of binary arrays by decoding the waveform signals, which are used to confirm the real-time position of the motor, and the signal is stable, the detection accuracy is high, the anti-interference ability is strong, the reliability is good, and it is not affected by harsh environments such as external vibration, oil pollution, and dust, and can improve the service life and practicality.

Description

Technical Field

[0001] The present invention relates to the technical field of motor products, and in particular to a closed-loop stepping motor. Background Art

[0002] As a power component, the motor is widely used in all walks of life. As an intelligent component, the stepper motor, especially the closed-loop stepper motor, is widely used in various fields. The closed-loop stepper motors currently available on the market usually detect the position of the motor by installing a grating encoder or a magnetic encoder. The disadvantage of the grating encoder is that it is easily affected by external vibration, oil, dust, etc., has high requirements for the use environment, has a narrow range of adaptability, and has low reliability; the disadvantage of the magnetic encoder is that the resolution is small, the accuracy is low, and it is difficult to meet the high-precision application environment. Summary of the invention

[0003] The technical problem to be solved by the present invention is to provide a closed-loop stepping motor with a simple structure, which can ensure high detection accuracy and is suitable for various operating environments in view of the defects in the prior art.

[0004] In order to solve the above technical problems, the present invention adopts the following technical solutions: a closed-loop stepping motor, comprising a housing, a stator assembly, a rotor assembly and a rotor shaft, wherein the rotor shaft is fixedly assembled with the rotor assembly, and the rotor assembly is installed in the stator assembly, characterized in that: it also comprises a rotor detection assembly and a stator detection assembly, wherein the rotor detection assembly comprises a rotor core and a rotor detection pole and is wound with a rotor detection coil, and the stator detection assembly comprises a stator core and a stator detection pole and is wound with a stator detection coil; the rotor detection assembly is fixedly assembled with the rotor shaft to form a structure that rotates synchronously with the rotor assembly, the stator detection assembly is fixedly assembled with the housing to form a fixed structure, the rotor detection assembly is arranged inside the stator detection assembly, and the rotor detection pole and the stator detection pole are relatively formed inside and outside to form an electromagnetic induction structure that can move relatively; the rotor detection coil and the stator detection coil are respectively connected with signal cables, and when an excitation signal is input, after being converted by the rotor detection coil and fed back to the stator detection coil of the stator detection assembly, the excitation signal is converted into two sets of continuous waveform signals with phase difference, and a set of binary arrays for confirming the real-time position of the motor is obtained through a waveform decoder.

[0005] Furthermore, a rotor detection winding groove is provided at the tail section of the rotor core of the rotor detection assembly, and a plurality of rotor detection poles are provided at the front section around a circle, and each rotor detection pole is arranged at a non-parallel inclination angle with the axial direction of the circle, i.e., inclined on the circle.

[0006] Furthermore, the rotor detection coil on the rotor detection assembly includes two groups of winding coils, which pass through the rotor detection winding slots and the rotor detection magnetic poles at the same time and are wound along the same position, but the winding directions along the rotor detection magnetic poles are opposite.

[0007] Furthermore, the shell includes a front cover and a rear cover, the rotor assembly is mounted on the front cover through the rotor shaft, the front cover and the rear cover respectively cover the front and rear ends of the shell of the stator assembly, and the three are connected and fixed by screws, and the motor cable is connected from the side of the rear cover.

[0008] Furthermore, the rotor detection assembly is fixed at the rear end of the rotor shaft to form a structure that operates synchronously with the rotor assembly; a positioning flange bearing is provided on the rotor shaft, and the positioning flange bearing is located in front of the rotor detection assembly. The positioning flange bearing forms an adjustment structure for the centering height of the rotor detection assembly and the stator detection assembly, that is, the alignment degree of the rotor detection assembly and the stator detection assembly is adjusted.

[0009] Furthermore, a stator detection winding groove is provided at the tail section of the stator detection assembly, and a plurality of stator detection poles are provided inside the front section of the stator core. The stator detection poles are opposite to the rotor detection poles, and the rotor detection poles move to cut the magnetic flux lines in the magnetic field of the stator detection poles; and the stator detection poles are evenly arranged axially along the inner circumferential surface of the stator core, and a magnetic isolation ring is provided between the stator detection winding groove and the stator detection poles for isolation.

[0010] Furthermore, the stator detection coil of the stator detection assembly includes three groups of winding coils, one group is a signal input coil, which is wound in the stator detection winding slot; the other two groups are signal output coils, which are wound on the stator detection magnetic poles. The two groups of signal output coils are wound with one magnetic pole between them and have the same winding direction.

[0011] Furthermore, the signal cable includes three groups, one group is the excitation signal input line, which is connected to the signal input coil in the stator detection winding slot; the other two groups are output signal lines, which are respectively connected to two groups of signal output coils on the stator detection magnetic poles.

[0012] Furthermore, the stator detection assembly is fixed in a casing, and the casing is fixed to the rear end surface of the rear end cover by screws.

[0013] Preferably, the excitation signal is a set of continuous waveform signals with one-to-one correspondence between amplitude and phase within a single cycle.

[0014] The present invention utilizes the principle of electromagnetic induction to convert the position signal of the motor into two sets of waveform signals with a certain phase difference, and then obtains a set of binary arrays by decoding the waveform signals, which are used to confirm the real-time position of the motor. The present invention has the advantages of stable signal, high detection accuracy, strong anti-interference ability, good reliability, etc., and is not affected by harsh environments such as external vibration, oil pollution, dust, etc., thereby improving service life and practicality. BRIEF DESCRIPTION OF THE DRAWINGS

[0015] Figure 1 This is the overall appearance structure diagram of the present invention;

[0016] Figure 2 This is a decomposition structure diagram of the present invention;

[0017] Figure 3 It is a cross-sectional structural diagram of the present invention;

[0018] Figure 4 This is the appearance structure diagram of the rotor detection component;

[0019] Figure 5 This is the appearance structure diagram of the stator detection component.

[0020] In the figure, 1 is a screw, 2 is a front end cover, 3 is a rotor assembly, 4 is a stator assembly, 5 is a rear end cover, 6 is a positioning flange bearing, 7 is a rotor detection assembly, 8 is a stator detection assembly, 9 is a housing, 10 is a screw, 11 is a signal cable, 12 is a motor cable, 13 is a rotor detection pole, 14 is a rotor detection winding groove, 15 is a stator detection pole, 16 is a magnetic isolation ring, 17 is a stator detection winding groove, and 18 is a rotor shaft. DETAILED DESCRIPTION

[0021] The present invention will be further described below by means of specific embodiments in conjunction with the accompanying drawings:

[0022] In this embodiment, refer to Figure 1-Figure 5 The closed-loop stepper motor includes a housing, a stator assembly 3, a rotor assembly 4 and a rotor shaft 18. The rotor shaft 18 is fixedly assembled with the rotor assembly 3, and the rotor assembly 3 is installed in the stator assembly 4; it also includes a rotor detection assembly 7 and a stator detection assembly 8. The rotor detection assembly 7 includes a rotor core and a rotor detection pole 13 and is wound with a rotor detection coil. The stator detection assembly 8 includes a stator core and a stator detection pole 15 and is wound with a stator detection coil; the rotor detection assembly 7 is fixedly assembled with the rotor shaft 18 to form a structure that rotates synchronously with the rotor assembly 3, the stator detection assembly 8 is fixedly assembled with the housing to form a fixed structure, the rotor detection assembly 7 is arranged inside the stator detection assembly 8, and the rotor detection pole 13 and the stator detection pole 15 are relatively formed with each other inside and outside to form an electromagnetic induction structure that can move relatively.

[0023] A rotor detection winding groove 14 is arranged at the tail section of the rotor core of the rotor detection assembly 7, and a plurality of rotor detection poles 13 arranged around a circle are arranged at the front section, and each rotor detection pole 13 is arranged at a non-parallel inclination angle (for example, 10 degrees) with the axial direction of the circle, that is, it is inclined on the circle.

[0024] The rotor detection coil on the rotor detection assembly 7 includes two groups of winding coils. The two groups of winding coils pass through the rotor detection winding slots 14 and the rotor detection magnetic poles 13 at the same time and are wound along the same position, but the winding directions along the rotor detection magnetic poles 13 are opposite.

[0025] The shell includes a front cover 2 and a rear cover 5. The rotor assembly 3 is mounted on the front cover 2 through the rotor shaft 18. The front cover 2 and the rear cover 5 respectively cover the front and rear ends of the outer shell of the stator assembly 3, and the three are connected and fixed by screws 1. The motor cable 12 is connected from the side of the rear cover 5.

[0026] The rotor detection assembly 7 is fixed to the rear end of the rotor shaft 18 to form a structure that operates synchronously with the rotor assembly 3; a positioning flange bearing 6 is provided on the rotor shaft 18, and the positioning flange bearing 6 is located in front of the rotor detection assembly 7. The positioning flange bearing 6 forms an adjustment structure for the centering height of the rotor detection assembly 7 and the stator detection assembly 8, that is, the alignment degree of the rotor detection assembly 7 and the stator detection assembly 8 is adjusted.

[0027] The tail section of the stator detection assembly 8 is provided with a stator detection winding groove 17, and a plurality of stator detection poles 15 are provided inside the front section of the stator core. The stator detection poles 15 are opposite to the rotor detection poles 13, and the rotor detection poles 13 move in the magnetic field of the stator detection poles 15 to cut the magnetic flux lines; and the stator detection poles 15 are evenly arranged along the axial direction of the inner circumference of the stator core, and a magnetic isolation ring 16 is provided between the stator detection winding groove 17 and the stator detection poles 15 for isolation.

[0028] The stator detection coil of the stator detection assembly 8 includes three groups of winding coils, one group is a signal input coil, which is wound in the stator detection winding slot 17; the other two groups are signal output coils, which are wound on the stator detection magnetic pole 15. The two groups of signal output coils are wound with one magnetic pole between them and have the same winding direction.

[0029] The signal cable 11 includes three groups, one group is the excitation signal input line, which is connected to the signal input coil in the stator detection winding slot 17; the other two groups are output signal lines, which are respectively connected to the two groups of signal output coils on the stator detection magnetic pole 15.

[0030] The stator detection assembly 8 is fixed in a housing 9 , and the housing 9 is fixed to the rear end surface of the rear end cover 5 by screws 10 .

[0031] The excitation signal is a set of continuous waveform signals with amplitude and phase corresponding to each other in a single cycle.

[0032] Install and fix the stator assembly 4 and the rear end cover 5, then place the rotor assembly 3 in the center hole of the stator assembly 4, then clamp the front end cover 2, and then tighten the screws 1 to fasten the front end cover 2, the stator assembly 4 and the rear end cover 5. Sleeve the positioning flange bearing 6 on the rear part of the rotor shaft 18, and then press the rotor detection assembly 7 into the rear end of the rotor shaft 18 so that it is in seamless contact with the positioning flange bearing 6. Clamp the stator detection assembly 8 into the housing 9, and then fix it on the rear end cover 5 with screws 10.

[0033] When the motor is running, the motor cable 12 is connected to the terminal connector corresponding to the driver, the two input lines of the signal cable 11 are connected to the excitation waveform signal, and the remaining output lines are connected to the signal decoder, converted into a digital signal, and fed back to the system. After the input excitation signal is converted by the rotor detection coil and fed back to the stator detection coil of the stator detection component 8, the excitation signal is converted into two sets of continuous waveform signals with a certain phase difference, and a set of binary arrays is obtained through the waveform decoder to confirm the real-time position of the motor.

[0034] The present invention has been described in detail above. The above description is only a preferred embodiment of the present invention and should not limit the scope of implementation of the present application. That is, all equivalent changes and modifications made within the scope of the present application should still fall within the scope of the present invention.

Claims

1. A closed-loop stepper motor, comprising a housing, a stator assembly, a rotor assembly and a rotor shaft, wherein the rotor shaft is assembled and fixed to the rotor assembly, and the rotor assembly is installed in the stator assembly, characterized in that: It also includes a rotor detection component and a stator detection component. The rotor detection component includes a rotor core and a rotor detection pole and is wound with a rotor detection coil. The stator detection component includes a stator core and a stator detection pole and is wound with a stator detection coil. The rotor detection component is assembled and fixed with the rotor shaft to form a structure that rotates synchronously with the rotor component. The stator detection component is assembled and fixed with the shell to form a fixed structure. The rotor detection component is arranged inside the stator detection component. The rotor detection pole and the stator detection pole are relatively formed with each other to form an electromagnetic induction structure that can move relatively. The rotor detection coil and the stator detection coil are respectively connected with signal cables. When an excitation signal is input, converted by the rotor detection coil and fed back to the stator detection coil of the stator detection component, the excitation signal is converted into two sets of continuous waveform signals with phase difference values. A set of binary arrays for confirming the real-time position of the motor is obtained through a waveform decoder. A rotor detection winding groove is arranged at the tail section of the rotor core of the rotor detection assembly, and a plurality of rotor detection magnetic poles are arranged at the front section around a circumference, and each rotor detection magnetic pole is arranged at a non-parallel inclination angle with the axial direction of the circumference; The rotor detection coil on the rotor detection assembly includes two sets of winding coils, which pass through the rotor detection winding slots and the rotor detection magnetic poles at the same time and are wound along the same position, but the winding directions along the rotor detection magnetic poles are opposite; The tail section of the stator detection assembly is provided with a stator detection winding slot, and the front section of the stator core is provided with a plurality of stator detection magnetic poles. The stator detection magnetic poles are opposite to the rotor detection magnetic poles, and the stator detection magnetic poles are evenly arranged along the axial direction of the inner circumference of the stator core. A magnetic isolation ring is provided between the stator detection winding slot and the stator detection magnetic pole for isolation; The stator detection coil of the stator detection assembly includes three groups of winding coils, one group is the signal input coil, which is wound in the stator detection winding slot; the other two groups are signal output coils, which are wound on the stator detection magnetic poles. The two groups of signal output coils are wound every other magnetic pole and have the same winding direction; The signal cable includes three groups, one group is the excitation signal input line, which is connected to the signal input coil in the stator detection winding slot; the other two groups are output signal lines, which are respectively connected to the two groups of signal output coils on the stator detection magnetic poles; The excitation signal is a set of continuous waveform signals with amplitude and phase corresponding to each other in a single cycle.

2. The closed-loop stepper motor according to claim 1, characterized in that: The shell includes a front cover and a rear cover. The rotor assembly is mounted on the front cover through the rotor shaft. The front cover and the rear cover respectively cover the front and rear ends of the stator assembly shell, and the three are connected and fixed by screws. The motor cable is connected from the side of the rear cover.

3. The closed-loop stepper motor according to claim 2, characterized in that: The rotor detection assembly is fixed at the rear end of the rotor shaft to form a structure that runs synchronously with the rotor assembly; a positioning flange bearing is provided on the rotor shaft, and the positioning flange bearing is located in front of the rotor detection assembly. The positioning flange bearing forms an adjustment structure for the centering height of the rotor detection assembly and the stator detection assembly.

4. The closed-loop stepper motor according to claim 2, characterized in that: The stator detection assembly is fixed in a casing, and the casing is fixed to the rear end surface of the rear end cover by screws.

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