A DC brushless electric steering gear with magnetic pole alignment and method applied to a strong magnetic environment

Abstract

The present invention relates to a DC brushless electric steering gear with pole alignment applicable to a strong magnetic environment and a method thereof. The present invention includes a steering gear, and a motor is arranged on the steering gear. The special feature lies in that when the motor is installed on the steering gear, the direction of the magnetic steel on the rotor of the motor is kept consistent with the magnetic field direction. The motor is connected with an FPGA circuit, and the FPGA circuit controls the power-on time length and simultaneously collects the Hall state. The present invention has the advantages of high versatility, easy implementation, easy operation, small volume and low cost.

Description

Technical Field

[0001] The present invention relates to the field of integrated information acquisition, data processing, and control microsystems, and particularly relates to a brushless DC electric steering gear with magnetic pole alignment and a method applicable to a strong magnetic environment. Background Art

[0002] The electromagnetic gun firing system has characteristics such as a strong magnetic environment, which poses higher requirements for the environmental adaptability of the on-board control system. At present, the on-board steering gear, as a part of the control system, has developed relatively maturely, but the strong magnetic field emission environment will have a certain impact on the steering gear. Ensuring the normal operation of the steering gear in a strong magnetic environment is the basis for the control system to play its role. The internal permanent magnet of the brushless DC motor in the steering gear is very sensitive to the external strong magnetic field and may affect the performance of the permanent magnet in a strong magnetic environment. Therefore, magnetic pole alignment must be carried out before each test launch to ensure that the steering gear can meet the environmental conditions of the strong magnetic field, so that the steering gear can operate normally.

[0003] Therefore, it is necessary to design a magnetic pole alignment device for a brushless DC motor to ensure that the performance of the brushless DC motor is not affected in a strong magnetic environment, so as to ensure the normal operation of the steering gear system in a strong magnetic environment. Summary of the Invention

[0004] The present invention provides a brushless DC electric steering gear with magnetic pole alignment and a method applicable to a strong magnetic environment to solve the problem that the permanent magnet in the motor of the existing steering gear system is affected by the magnetic field in a strong magnetic environment, resulting in the abnormal operation of the motor.

[0005] The technical solution of the present invention is as follows: The present invention is a brushless DC electric steering gear with magnetic pole alignment applicable to a strong magnetic environment, including a steering gear, and a motor is arranged on the steering gear. The special feature is that when the motor is installed on the steering gear, the direction of the permanent magnet on the rotor of the motor is kept consistent with the magnetic field direction. The motor is connected to an FPGA circuit, and the FPGA circuit controls the power-on time length and simultaneously collects the Hall state.

[0006] Further, a mark indicating the N pole of the motor magnetic pole is provided on the top of the motor. According to the mark, the direction of the permanent magnet on the rotor of the motor is kept consistent with the magnetic field direction.

[0007] Further, the FPGA circuit powers on the motor by designing the power-on duration, and simultaneously collects the current Hall state to judge whether the magnetic pole direction of the motor is consistent with the magnetic field direction.

[0008] Further, the motor is a single-pole brushless DC motor.

[0009] Further, the mark is a threaded hole.

[0010] A method for implementing the above-mentioned DC brushless electric steering gear with magnetic pole alignment applied to a strong magnetic environment, characterized in that: the method includes the following steps:

[0011] 1) When installing the motor on the steering gear, make the direction of the permanent magnet on the rotor of the motor consistent with the direction of the magnetic field.

[0012] 2) Control the power-on time length through the FPGA circuit, and at the same time collect the Hall state to ensure that the magnetic poles can be completely rotated to the correct position during the power-on process.

[0013] Further, the specific steps of step 1) are as follows:

[0014] 1.1) There is a mark on the top of the motor to identify the N pole of the magnetic pole of the motor.

[0015] 1.2) Make the direction of the permanent magnet on the rotor of the motor consistent with the direction of the magnetic field according to the mark.

[0016] Further, the mark in step 1.1) is a threaded hole.

[0017] Further, the specific steps of step 2) are as follows:

[0018] 2.1) Before the strong magnetic pulse arrives, power on the motor in winding A->C. Through the FPGA circuit, ensure that the magnetic poles can be completely rotated to the correct position during the power-on process. By powering on one of the three phases of the motor, A->C, the FPGA circuit controls the power-on time length, and at the same time collects the Hall state.

[0019] 2.2) When the Hall timing satisfies the states of 0, 1 / 0, 1 / 0, 1, it is considered that the magnetic poles of the motor are consistent with the direction of the magnetic field, and the power-on time for A->C is controlled between 500 ms and 2 s.

[0020] Further, after step 2), there is also step 3) After alignment, the FPGA circuit can be used to read the magnetic pole alignment state and confirm the state of the magnetic pole position after alignment.

[0021] The present invention relates to a DC brushless electric steering gear with pole alignment applied to a strong magnetic environment and a method. Through a specific installation method, combined with an FPGA circuit to control the power-on duration of the motor, and collect Hall signals to judge the pole direction of the motor and the magnetic field direction, the function of pole alignment of the DC brushless motor is realized, so as to solve the adaptability of the brushless DC motor to the strong magnetic environment under the emission of strong magnetic pulses. The present invention aims at a single-pole DC brushless motor. Through mechanical installation, the direction of the magnetic steel on the aligned motor rotor is kept consistent with the magnetic field direction, thereby avoiding the demagnetization of the magnetic steel of the motor and ensuring that the performance of the motor meets the use requirements. Before the arrival of the strong magnetic pulse, the windings of the motor are energized according to a specific phase sequence. After energization, alignment starts. The aligned pole position is consistent with the designed installation direction. The power-on time is controlled between 500 ms and 2 s. With the cooperation of the FPGA circuit, it is ensured that the poles can be completely rotated to the correct position during the power-on process. After alignment, the FPGA circuit can be used to read the pole alignment status and confirm the status of the pole position after alignment. The present invention solves the problem that the traditional motor is demagnetized in the strong magnetic pulse emission environment, which affects its normal operation. The present invention has the advantages of high versatility, easy implementation, easy operation, small volume and low cost. BRIEF DESCRIPTION OF THE DRAWINGS

[0022] Figure 1 FIG. is a schematic diagram of the installation of the motor of the present invention in the steering gear;

[0023] Figure 2 FIG. is a schematic diagram of the internal magnetic steel position of the motor of the present invention after pole alignment.

[0024] The reference numerals are as follows:

[0025] 1. Motor; 2. Steering gear; 3. Threaded hole. DETAILED DESCRIPTION OF THE EMBODIMENTS

[0026] The following further details the overall solution of the present invention in conjunction with the drawings and specific embodiments:

[0027] See Figure 1 , a DC brushless electric steering gear with pole alignment applied to a strong magnetic environment provided by the specific embodiment structure of the present invention. The motor 1 adopts a single-pole DC brushless motor, a total of four. Through a mechanical installation method, looking down from the top of the motor 1 through the motor housing, the magnetic pole distribution of the magnetic steel needs to be in accordance with Figure 1Proceed as shown. Mark the N pole of the magnetic pole of the motor 1 with a threaded hole 3 at the top of the motor to show the magnetic pole direction. When installing the servo 2, the magnetic pole direction needs to be kept consistent with the external magnetic field direction, with an error range of ±60 degrees. Such installation makes the magnetic steel direction on the rotor of the motor 1 consistent with the magnetic field direction, thus avoiding demagnetization of the magnetic steel of the motor 1. At the same time, before the arrival of the strong magnetic pulse, power is applied to the motor 1 in the winding A->C. Through the cooperation of the FPGA circuit and software, ensure that the magnetic pole can be completely rotated to the correct position during the power-on process. By applying power to one of the three phases of the motor 1, A->C, the FPGA circuit controls the power-on time length and simultaneously collects the Hall state. When the Hall timing satisfies the state of 0, 1 / 0, 1 / 0, 1 (tentative), it is considered that the magnetic pole of the motor 1 is consistent with the magnetic field direction. The power-on time for A->C is controlled between 500 ms and 2 s (this time is determined by actual tests). The magnetic pole must stop at the position as shown in Figure 2 and the allowable position deviation after alignment is within ±60°. Realize the function of aligning the magnetic poles of the DC brushless motor.

[0028] The servo is of an existing structure, and the FPGA circuit can be designed using an existing circuit according to the functional description of the FPGA circuit.

[0029] The present invention also provides a method for realizing a DC brushless electric servo with magnetic pole alignment applied to a strong magnetic environment. The method includes the following steps:

[0030] 1) When installing the motor on the servo, make the magnetic steel direction on the rotor of the motor consistent with the magnetic field direction. 1.1) There is a mark on the top of the motor to mark the N pole of the magnetic pole of the motor; the mark is a threaded hole;

[0031] 1.2) Make the magnetic steel direction on the rotor of the motor consistent with the magnetic field direction according to the mark.

[0032] 2) Control the power-on time length through the FPGA circuit and simultaneously collect the Hall state to ensure that the magnetic pole can be completely rotated to the correct position during the power-on process;

[0033] 2.1) Before the arrival of the strong magnetic pulse, apply power to the motor in the winding A->C. Through the FPGA circuit, ensure that the magnetic pole can be completely rotated to the correct position during the power-on process. By applying power to one of the three phases of the motor, A->C, the FPGA circuit controls the power-on time length and simultaneously collects the Hall state,

[0034] 2.2) When the Hall timing satisfies the state of 0, 1 / 0, 1 / 0, 1, it is considered that the magnetic pole of the motor is consistent with the magnetic field direction. The power-on time for A->C is controlled between 500 ms and 2 s.

[0035] 3) After alignment, the FPGA circuit can be used to read the pole alignment state and confirm the state of the pole position after pole alignment.

[0036] The technical content not specifically described in the present invention and the above embodiments is the same as the prior art.

[0037] The above is only the specific implementation manner disclosed by the present invention, but the protection scope disclosed by the present invention is not limited thereto. The protection scope disclosed by the present invention shall be subject to the protection scope of the claims.

Claims

1. A method for a DC brushless electric steering gear with magnetic pole alignment applied to a strong magnetic environment, characterized in that: The DC brushless electric steering gear with pole alignment applied to a strong magnetic environment includes a steering gear, on which a motor is provided. When the motor is installed on the steering gear, the magnetic pole direction of the permanent magnet on the rotor of the motor is kept consistent with the magnetic field direction. The motor is connected to an FPGA circuit, which controls the power-on time length and simultaneously collects the Hall state. A mark indicating the N pole of the motor magnetic pole is provided at the top of the motor. According to the mark, the magnetic pole direction of the permanent magnet on the rotor of the motor is kept consistent with the magnetic field direction. The FPGA circuit designs the power-on duration to power on the motor and simultaneously collects the current Hall state to judge whether the magnetic pole direction of the permanent magnet on the rotor is consistent with the magnetic field direction. The method includes the following steps: 1) When installing the motor on the steering gear, keep the magnetic pole direction of the permanent magnet on the rotor of the motor consistent with the magnetic field direction; 1.1) A mark indicating the N pole of the motor magnetic pole is provided at the top of the motor; 1.2) According to the mark, keep the magnetic pole direction of the permanent magnet on the rotor of the motor consistent with the magnetic field direction; 2) Control the power-on time length through the FPGA circuit and simultaneously collect the Hall state to ensure that the magnetic poles can be completely rotated to the correct position during the power-on process; 2.1) Before the strong magnetic pulse arrives, power on the motor between winding A->C. Through the FPGA circuit, ensure that the magnetic poles can be completely rotated to the correct position during the power-on process. By powering on one of the three phases of the motor, A->C, the FPGA circuit controls the power-on time length and simultaneously collects the Hall state. 2.2) When the Hall signals sequentially satisfy the states of 0, 1 / 0, 1 / 0, and 1 in chronological order, it is considered that the magnetic pole direction of the permanent magnet on the rotor is consistent with the magnetic field direction, and the power-on time for A->C is controlled between 500 ms and 1 s.

2. The method of the DC brushless electric steering gear with magnetic pole alignment applied to a strong magnetic environment according to claim 1, characterized in that: After the step 2), there is also a step 3) After alignment, the FPGA circuit can read the magnetic pole alignment state and confirm the state of the magnetic pole position after alignment.

3. The method of the brushless DC electric steering gear with pole alignment applied to a strong magnetic environment according to claim 2, wherein: The motor is a single-pole DC brushless motor.

4. The method of the DC brushless electric steering gear with pole alignment applied to a strong magnetic environment according to claim 3, characterized in that: The mark is a threaded hole.

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