阅读说明：本技术 一种混合励磁双凸极电机相电流重构方法 (Method for reconstructing current of hybrid excitation doubly salient motor phase ) 是由 陈旭 张卓然 张伟秋 于立 于 2021-07-13 设计创作，主要内容包括：本发明为一种混合励磁双凸极电机相电流重构方法,涉及电力电子及电力传动领域。本发明设计了一种混合励磁双凸极电机相电流重构方法,取消传统分别测量三相电流的三个电流传感器,仅使用一个电流传感器测量三相电流,搭配本发明设计的电流重构算法,在不降低采样精度的情况下,减少了电流传感器数量,降低了成本,降低了控制系统的体积与重量,提高了电机控制系统整体的功率密度。(The invention discloses a method for reconstructing the phase current of a hybrid excitation doubly salient pole motor, and relates to the field of power electronics and power transmission. The invention designs a current reconstruction method for a hybrid excitation doubly salient motor phase, which cancels three current sensors for respectively measuring three-phase current in the prior art, only uses one current sensor to measure the three-phase current, and combines the current reconstruction algorithm designed by the invention, thereby reducing the number of the current sensors, reducing the cost, reducing the volume and the weight of a control system and improving the overall power density of a motor control system under the condition of not reducing the sampling precision.)

1. A method for reconstructing current of a hybrid excitation doubly salient motor phase is characterized by comprising the following steps: the device comprises a motor controller main circuit (1), a current sensor (2), a current reconstruction algorithm (3), a rotary transformer and a decoding circuit (4); the motor controller main circuit (1) is composed of MOS tubes or IGBT tubes Q1-Q6.

2. The method for reconstructing the current of the hybrid excitation doubly salient motor phase as claimed in claim 1, wherein: the source electrode of the MOS tube or IGBT tube Q1 of the motor controller main circuit (1) and the drain electrode of the MOS tube or IGBT tube Q4 of the motor controller main circuit (1) are connected together and led out to be connected to a stator winding of the hybrid excitation doubly salient motor; the source electrode of an MOS (metal oxide semiconductor) tube or an IGBT (insulated gate bipolar transistor) tube Q3 of the motor controller main circuit (1), the drain electrode of an MOS tube or an IGBT tube Q6 of the motor controller main circuit (1) are connected together and are led out to be connected to a stator winding of the hybrid excitation doubly salient motor; the source electrode of the MOS tube or IGBT tube Q5 of the motor controller main circuit (1) and the drain electrode of the MOS tube or IGBT tube Q2 of the motor controller main circuit (1) are connected together and led out to penetrate through the current sensor (2) to be connected to the stator winding of the hybrid excitation double salient pole motor.

3. The method for reconstructing the current of the hybrid excitation doubly salient motor phase as claimed in claim 1, wherein: power supply U_inThe anode of the power supply U is connected with the drain electrode of a MOS tube or an IGBT tube Q1 and is connected with the drain electrodes of the MOS tube or the IGBT tube Q3 and Q5 through the current sensor (2), and the power supply U_inThe negative pole of the current sensor is connected with the source electrode of the MOS tube or the IGBT tube Q4 and passes through the current sensor (2) to be connected with the source electrodes of the MOS tube or the IGBT tube Q2 and Q6.

4. The method for reconstructing the current of the hybrid excitation doubly salient motor phase as claimed in claim 3, wherein the method comprises the following steps: the direction of the three wires passing through the current sensor (2) is determined according to the following standard: assuming that only current in the three wires passing through the current sensor (2) flows out from the positive electrode of a power supply Uin or the drain electrode of a MOS tube or an IGBT tube Q1 and flows into the drain electrodes of the MOS tube or the IGBT tube Q3 and Q5, the current sensor (2) outputs a positive signal; assuming that only current in the three wires passing through the current sensor (2) flows out from the negative pole of the power supply Uin or the source electrode of the MOS tube or the IGBT tube Q4 and flows into the source electrodes of the MOS tube or the IGBT tube Q6 and Q2, the current sensor (2) outputs a positive signal; assuming that only current in the three wires passing through the current sensor (2) flows out from the drain electrode of the MOS tube or IGBT tube Q2 or the drain electrode of the MOS tube or IGBT tube Q5 and flows into the stator winding of the hybrid excitation doubly salient motor, the current sensor (2) outputs a positive signal.

5. The method for reconstructing the current of the hybrid excitation doubly salient motor phase as claimed in claim 1, wherein: the current sensor (2) outputs the sum i of the currents passing through the three wires of the current sensor (2)_s。

6. The method for reconstructing the current of the hybrid excitation doubly salient motor phase as claimed in claim 1, wherein: the input of the current reconstruction algorithm (3) is the sum i of the currents output by the current sensor (2) and passing through the three lines of the current sensor (2)_sObtaining three-phase current i through the operation of a current reconstruction algorithm (3)_A，i_B，i_C。

7. The method for reconstructing the current of the hybrid excitation doubly salient motor phase as claimed in claim 1, wherein: in the rotary transformer and the decoding circuit (4), the rotary transformer is arranged on the hybrid excitation doubly salient motor, and the electrical angle theta of the motor is obtained through the decoding circuit_e。

8. The method for reconstructing the current of the hybrid excitation doubly salient motor phase as claimed in claim 1, wherein: the current reconstruction algorithm (3) is performed according to the following calculation method:

the electrical angle theta of the motor of 360 degrees_eThe range of the motor is averagely divided into three sections of 0 degree to 120 degrees, 120 degrees to 240 degrees and 240 degrees to 360 degrees, and the electrical angle theta of the motor is obtained from a rotary transformer and a decoding circuit (4)_eJudging the section of the electrical angle of the motor at the electrical angle theta of the motor_eIn the interval of 0-120 DEG, i_A＝-i_s/2，i_B＝0，i_C＝i_s2; at the electrical angle theta of the motor_eIn the interval of 120-240 DEG, i_A＝-i_s，i_B＝i_s，i_CAt the electrical angle theta of the motor equal to 0_eIn the interval of 240-360 DEG, i_A＝0，i_B＝-i_s，i_C＝i_s。

Technical Field

The invention relates to the field of power electronics and power transmission, in particular to a method for reconstructing the phase current of a hybrid excitation doubly salient pole motor.

Background

The hybrid excitation doubly salient motor has the advantages of simple structure, high reliability, no winding and permanent magnet of the stator, suitability for high-speed operation, capability of operating under severe conditions for a long time, and low cost, so the hybrid excitation doubly salient motor is very suitable for application occasions with high speed and high performance requirements, such as aviation generators, electric transportation carrying equipment and the like.

In the control of the hybrid excitation doubly salient motor, the sampling of phase current directly influences the performance of current control and the implementation of a fault protection strategy, and is a crucial link in a motor control system. In a hybrid excitation doubly salient motor system, a current sensor is generally required for each phase winding to perform phase current sampling, so that each phase current is provided for individual control. The use of these current sensors not only increases the cost and volume of the motor system, but also reduces the reliability of the system. In order to solve the problem, patent CN201811321801.2 "a method for reconstructing phase current of a switched reluctance motor" discloses a method for reconstructing current by using two current sensors, in which the current sensors are installed at the middle points of an upper bus and a lower bus, and the stator current is reconstructed by judging the rotor angle interval, although the number of the current sensors is reduced, the number of the sensors can still be further reduced.

Disclosure of Invention

Aiming at the defects of the prior art, the invention aims to solve the problems of high cost, large volume and weight and low reliability caused by the large number of current sensors in a hybrid excitation double-salient motor driving system. The invention provides a method for reconstructing the phase current of a hybrid excitation doubly salient motor.

The invention adopts the following technical scheme for solving the technical problems:

the invention provides a method for reconstructing the phase current of a hybrid excitation doubly salient motor, which comprises the following modules: the motor controller comprises a motor controller main circuit (1), a current sensor (2), a current reconstruction algorithm (3) and a rotary transformer and decoding circuit (4). The motor controller main circuit (1) is composed of MOS tubes or IGBT tubes Q1-Q6.

Preferably, the source (emitter) of the MOS tube or IGBT tube Q1 of the motor controller main circuit (1) and the drain (collector) of the MOS tube or IGBT tube Q4 of the motor controller main circuit (1) are connected together and led out to be connected to the stator winding of the hybrid excitation double salient motor; the source electrode (emitting electrode) of an MOS tube or an IGBT tube Q3 of the motor controller main circuit (1), the drain electrode (collecting electrode) of an MOS tube or an IGBT tube Q6 of the motor controller main circuit (1) are connected together and are led out to be connected to a stator winding of the hybrid excitation doubly salient motor; the source electrode (emitting electrode) of the MOS tube or IGBT tube Q5 of the motor controller main circuit (1) and the drain electrode (collector electrode) of the MOS tube or IGBT tube Q2 of the motor controller main circuit (1) are connected together and led out to penetrate through the current sensor (2) to be connected to the stator winding of the hybrid excitation double salient pole motor.

Preferably, the power supply U_inThe anode of the power supply U is connected with the drain electrode (collector electrode) of an MOS tube or an IGBT tube Q1 and is connected with the drain electrode (collector electrode) of the MOS tube or the IGBT tube Q3 and Q5 through a current sensor (2), and the power supply U_inIs connected with the source electrode (collector electrode) of the MOS tube or IGBT tube Q4 and is connected with the source electrode (collector electrode) of the MOS tube or IGBT tube Q2 and Q6 through the current sensor (2).

Preferably, the direction of the three wires passing through the current sensor (2) is determined by the following criteria: assuming that only current in the three wires passing through the current sensor (2) flows out from the positive electrode of the power supply Uin or the drain electrode (collector electrode) of the MOS tube or the IGBT tube Q1 and flows into the drain electrode (collector electrode) of the MOS tube or the IGBT tube Q3 and Q5, the current sensor (2) outputs a positive signal; assuming that only current in the three wires passing through the current sensor (2) flows out from the negative electrode of the power supply Uin or the source electrode (collector electrode) of the MOS tube or the IGBT tube Q4 and flows into the source electrode (collector electrode) of the MOS tube or the IGBT tube Q6 and Q2, the current sensor (2) outputs a positive signal; assuming that only current in the three wires passing through the current sensor (2) flows out from the drain (collector) of the MOS tube or IGBT tube Q2 or the drain (collector) of the MOS tube or IGBT tube Q5 and flows into the stator winding of the hybrid excitation doubly salient motor, the current sensor (2) outputs a positive signal.

Preferably, the current sensor (2) outputs the sum i of the currents through the three wires of the current sensor (2)_s。

Preferably, the input of the current reconstruction algorithm (3) is the sum i of the currents output by the current sensor (2) and passing through the three wires of the current sensor (2)_sObtaining three-phase current i through the operation of a current reconstruction algorithm (3)_A，i_B，i_C。

Preferably, in the resolver and decoding circuit (4), the resolver is mountedOn the hybrid excitation doubly salient motor, the electrical angle theta of the motor is obtained through a decoding circuit_e。

Preferably, the current reconstruction algorithm (3) is performed according to the following calculation method:

the electrical angle theta of the motor of 360 degrees_eThe range of the motor is averagely divided into three sections of 0 degree to 120 degrees, 120 degrees to 240 degrees and 240 degrees to 360 degrees, and the electrical angle theta of the motor is obtained from a rotary transformer and a decoding circuit (4)_eJudging the section of the electrical angle of the motor at the electrical angle theta of the motor_eIn the interval of 0-120 DEG, i_A＝-i_s/2，i_B＝0，i_C＝i_s2; at the electrical angle theta of the motor_eIn the interval of 120-240 DEG, i_A＝-i_s，i_B＝i_s，i_CAt the electrical angle theta of the motor equal to 0_eIn the interval of 240-360 DEG, i_A＝0，i_B＝-i_s，i_C＝i_s。

Compared with the prior art, the invention adopting the technical scheme has the following technical effects:

1. according to the invention, three-phase current can be measured by only using one current sensor, so that the number of the current sensors is reduced, the cost is reduced, the volume and the weight of a control system are reduced, and the overall power density of the motor control system is improved;

2. the current reconstruction algorithm designed by the invention obtains the three-phase current actual value through very simple operation according to the actual current value acquired by the current sensor through interval judgment, the operation amount is small, and the sampling precision is not reduced.

Drawings

FIG. 1 is a schematic diagram of the hardware control system connections of the present invention.

FIG. 2 is a schematic diagram of the current reconstruction algorithm of the present invention.

Detailed Description

The technical scheme of the invention is further explained in detail by combining the attached drawings:

a method for reconstructing current of a hybrid excitation doubly salient motor phase comprises the following modules: the motor controller comprises a motor controller main circuit (1), a current sensor (2), a current reconstruction algorithm (3) and a rotary transformer and decoding circuit (4). The motor controller main circuit (1) is composed of MOS tubes or IGBT tubes Q1-Q6.

Preferably, the source (emitter) of the MOS tube or IGBT tube Q1 of the motor controller main circuit (1) and the drain (collector) of the MOS tube or IGBT tube Q4 of the motor controller main circuit (1) are connected together and led out to be connected to the stator winding of the hybrid excitation double salient motor; the source electrode (emitting electrode) of an MOS tube or an IGBT tube Q3 of the motor controller main circuit (1), the drain electrode (collecting electrode) of an MOS tube or an IGBT tube Q6 of the motor controller main circuit (1) are connected together and are led out to be connected to a stator winding of the hybrid excitation doubly salient motor; the source electrode (emitting electrode) of the MOS tube or IGBT tube Q5 of the motor controller main circuit (1) and the drain electrode (collector electrode) of the MOS tube or IGBT tube Q2 of the motor controller main circuit (1) are connected together and led out to penetrate through the current sensor (2) to be connected to the stator winding of the hybrid excitation double salient pole motor.

Preferably, the power supply U_inThe anode of the power supply U is connected with the drain electrode (collector electrode) of an MOS tube or an IGBT tube Q1 and is connected with the drain electrode (collector electrode) of the MOS tube or the IGBT tube Q3 and Q5 through a current sensor (2), and the power supply U_inIs connected with the source electrode (collector electrode) of the MOS tube or IGBT tube Q4 and is connected with the source electrode (collector electrode) of the MOS tube or IGBT tube Q2 and Q6 through the current sensor (2).

Preferably, the direction of the three wires passing through the current sensor (2) is determined by the following criteria: assuming that only current in the three wires passing through the current sensor (2) flows out from the positive electrode of the power supply Uin or the drain electrode (collector electrode) of the MOS tube or the IGBT tube Q1 and flows into the drain electrode (collector electrode) of the MOS tube or the IGBT tube Q3 and Q5, the current sensor (2) outputs a positive signal; assuming that only current in the three wires passing through the current sensor (2) flows out from the negative electrode of the power supply Uin or the source electrode (collector electrode) of the MOS tube or the IGBT tube Q4 and flows into the source electrode (collector electrode) of the MOS tube or the IGBT tube Q6 and Q2, the current sensor (2) outputs a positive signal; assuming that only current in the three wires passing through the current sensor (2) flows out from the drain (collector) of the MOS tube or IGBT tube Q2 or the drain (collector) of the MOS tube or IGBT tube Q5 and flows into the stator winding of the hybrid excitation doubly salient motor, the current sensor (2) outputs a positive signal.

Preferably, the current sensor (2) outputs the sum i of the currents through the three wires of the current sensor (2)_s。

Preferably, the input of the current reconstruction algorithm (3) is the sum i of the currents output by the current sensor (2) and passing through the three wires of the current sensor (2)_sObtaining three-phase current i through the operation of a current reconstruction algorithm (3)_A，i_B，i_C。

Preferably, in the resolver and decoding circuit (4), the resolver is mounted on the hybrid excitation doubly salient motor, and the motor electrical angle theta is obtained by the decoding circuit_e。

Preferably, the current reconstruction algorithm (3) is performed according to the following calculation method:

the electrical angle theta of the motor of 360 degrees_eThe range of the motor is averagely divided into three sections of 0 degree to 120 degrees, 120 degrees to 240 degrees and 240 degrees to 360 degrees, and the electrical angle theta of the motor is obtained from a rotary transformer and a decoding circuit (4)_eJudging the section of the electrical angle of the motor at the electrical angle theta of the motor_eIn the interval of 0-120 DEG, i_A＝-i_s/2，i_B＝0，i_C＝i_s2; at the electrical angle theta of the motor_eIn the interval of 120-240 DEG, i_A＝-i_s，i_B＝i_s，i_CAt the electrical angle theta of the motor equal to 0_eIn the interval of 240-360 DEG, i_A＝0，i_B＝-i_s，i_C＝i_s。