阅读说明：本技术 电机的参数计算装置、参数计算方法和电机装置 (Parameter calculation device and method for motor, and motor device ) 是由 中岛洋一郎 于 2018-09-07 设计创作，主要内容包括：本申请实施例提供一种电机的参数计算装置、方法和电机装置,该参数计算装置包括：q轴电感计算单元,其根据电机的转子在第一固定位置的情况下电机的三相绕组端子中全部的绕组端子之间被施加第一单相交流电压时流过三相绕组的电流,以及第一单相交流电压,计算电机的q轴阻抗,并根据q轴阻抗计算电机的q轴电感；d轴电感计算单元,其根据电机的转子在第二固定位置的情况下电机的三相绕组端子中的两相绕组端子之间被施加第二单相交流电压时流过两相绕组的电流,以及第二单相交流电压,计算电机的d轴阻抗,并根据d轴阻抗计算电机的d轴电感。本实施例能够以高精度计算电机的d轴电感和q轴电感。(The embodiment of the application provides a parameter calculation device and method of a motor and a motor device, wherein the parameter calculation device comprises: a q-axis inductance calculation unit that calculates a q-axis impedance of the motor based on a current flowing through the three-phase winding when a first single-phase alternating-current voltage is applied between all of the three-phase winding terminals of the motor with the rotor of the motor at the first fixed position and the first single-phase alternating-current voltage, and calculates a q-axis inductance of the motor based on the q-axis impedance; a d-axis inductance calculation unit that calculates a d-axis impedance of the motor based on a current flowing through the two-phase winding when a second single-phase alternating-current voltage is applied between two-phase winding terminals of three-phase winding terminals of the motor with the rotor of the motor at the second fixed position, and the second single-phase alternating-current voltage, and calculates a d-axis inductance of the motor based on the d-axis impedance. The present embodiment can calculate the d-axis inductance and the q-axis inductance of the motor with high accuracy.)

1. A parameter calculation device of an electric motor, in which three-phase alternating-current voltages converted from direct-current voltages by an inverter circuit according to three-phase voltage command values are supplied to respective terminals of three-phase winding terminals of the electric motor, the parameter calculation device comprising:

a q-axis inductance calculation unit that calculates a q-axis impedance of the motor from a current flowing through the three-phase winding when a first single-phase alternating-current voltage is applied between all of three-phase winding terminals of the motor with a rotor of the motor at a first fixed position and the first single-phase alternating-current voltage, and calculates a q-axis inductance of the motor from the q-axis impedance; and

a d-axis inductance calculation unit that calculates a d-axis impedance of the motor based on a current flowing through two-phase windings when a second single-phase alternating-current voltage is applied between two of three-phase winding terminals of the motor with a rotor of the motor at a second fixed position, and the second single-phase alternating-current voltage, and calculates a d-axis inductance of the motor based on the d-axis impedance.

2. Parameter calculation apparatus according to claim 1,

the rotor rotates to the first fixed position with all of the three-phase winding terminals applied with a first direct-current voltage.

3. The parameter calculation apparatus according to claim 1, wherein the parameter calculation apparatus further comprises:

a winding resistance calculation unit that calculates a winding resistance of the motor based on a current flowing through the three-phase winding when a second direct-current voltage is applied between all of the three-phase winding terminals of the motor and the second direct-current voltage.

4. Parameter calculation apparatus according to claim 1,

the rotor rotates to the second fixed position with a third direct-current voltage applied between the two-phase winding terminals.

5. The parameter calculation apparatus according to claim 1, wherein the parameter calculation apparatus further comprises:

a counter electromotive force coefficient calculating unit which, when the rotor of the motor is rotated in a no-load state by constant voltage frequency ratio control,

the back electromotive force coefficient calculation unit calculates a back electromotive force coefficient of the motor based on the voltage command value input to the inverter circuit, the current of the motor, and the frequency command value of the constant voltage frequency ratio control.

6. An electric machine arrangement comprising:

a motor;

an inverter circuit that converts direct current into three-phase alternating current according to three-phase voltage command values and supplies the three-phase alternating current to three-phase winding terminals of the motor, respectively;

a current sensor that detects a current flowing from the inverter circuit to the motor;

a U-phase current controller for generating a U-phase voltage command value based on the U-phase current command value and the U-phase current detected by the current sensor;

a W-phase current controller that generates a W-phase voltage command value based on a W-phase current command value and the W-phase current detected by the current sensor;

a V-phase voltage command calculator that generates a V-phase voltage command value based on a U-phase voltage command value output from the U-phase current controller and a W-phase voltage command value output from the W-phase current controller;

a gate signal generator that generates a gate signal for driving the inverter circuit based on the U-phase voltage command value, the V-phase voltage command value, and the W-phase voltage command value; and

parameter calculation apparatus according to any one of claims 1 to 5.

7. A parameter calculation method of an electric motor in which three-phase alternating-current voltages obtained by converting direct-current voltages according to three-phase voltage command values by an inverter circuit are supplied to respective terminals of three-phase winding terminals of the electric motor, the parameter calculation method comprising:

calculating a q-axis impedance of the motor from a current flowing through the three-phase windings when a first single-phase alternating-current voltage is applied between all of three-phase winding terminals of the motor with the rotor of the motor at a first fixed position and the first single-phase alternating-current voltage, and calculating a q-axis inductance of the motor from the q-axis impedance; and

calculating a d-axis impedance of the motor based on a current flowing through two-phase windings when a second single-phase alternating current voltage is applied between two of three-phase winding terminals of the motor with a rotor of the motor at a second fixed position and the second single-phase alternating current voltage, and calculating a d-axis inductance of the motor based on the d-axis impedance.

8. The parameter calculation method according to claim 7, further comprising:

the winding resistance of the motor is calculated from the current flowing through the three-phase windings when a second direct-current voltage is applied between all of the three-phase winding terminals of the motor, and the second direct-current voltage.

9. The parameter calculation method according to claim 7, further comprising:

when a rotor of the motor is rotated in a no-load state by a constant voltage frequency ratio control, a back electromotive force coefficient of the motor is calculated based on the voltage command value input to the inverter circuit, a current value of the motor, and a frequency command value of the constant voltage frequency ratio control.

Technical Field

The invention relates to the field of electromechanical control, in particular to a parameter calculation device and a parameter calculation method of a motor and a motor device.

Background

When vector control is performed on the motor, parameters of the motor need to be grasped in advance. In particular, in the case where it is difficult to provide a sensor for detecting the rotor position, or in the case where a sensor is not provided for cost reduction, the parameters of the motor need to have very high accuracy for the position sensorless control.

In patent document 1, there is provided a parameter calculation method for a Permanent Magnet (PM) motor, in which a rotating shaft of the motor is fixed and direct current is applied to the motor, thereby calculating a winding resistance and a winding inductance of the motor.

Patent document 1: japanese patent laid-open No. 2013-078200A

It should be noted that the above background description is only for the sake of clarity and complete description of the technical solutions of the present invention and for the understanding of those skilled in the art. Such solutions are not considered to be known to the person skilled in the art merely because they have been set forth in the background section of the invention.

Disclosure of Invention

In an Interior Permanent Magnet (IPM) motor in which a PM motor has saliency, d-axis inductance and q-axis inductance are different from each other, and in the position sensorless control using maximum torque control and saliency, it is necessary to obtain the d-axis inductance and q-axis inductance of the motor with high accuracy. The inventors found that in patent document 1, since the saliency is not considered when calculating the inductance, the d-axis inductance and the q-axis inductance are not calculated separately, but the d-axis inductance and the calculated q-axis inductance are considered to be the same. Therefore, when the motor parameter is calculated by the method of patent document 1, there is a problem that the d-axis inductance cannot be accurately calculated.

Embodiments of the present invention provide a parameter calculation apparatus, a parameter calculation method, and a motor apparatus for a motor, which are capable of calculating d-axis inductance of the motor with high accuracy by applying single-phase alternating current between two phase winding terminals among three phase winding terminals of the motor while a motor rotor is held at a fixed position.

According to a first aspect of embodiments of the present application, there is provided a parameter calculation device of a motor to which three-phase ac voltages obtained by converting dc voltages according to three-phase voltage command values by an inverter circuit are supplied, respectively, the parameter calculation device including: a q-axis inductance calculation unit that calculates a q-axis impedance of the motor from a current flowing through the three-phase winding when a first single-phase alternating-current voltage is applied between all of three-phase winding terminals of the motor with a rotor of the motor at a first fixed position and the first single-phase alternating-current voltage, and calculates a q-axis inductance of the motor from the q-axis impedance; a d-axis inductance calculation unit that calculates a d-axis impedance of the motor based on a current flowing through two-phase windings when a second single-phase alternating-current voltage is applied between two of three-phase winding terminals of the motor with a rotor of the motor at a second fixed position, and the second single-phase alternating-current voltage, and calculates a d-axis inductance of the motor based on the d-axis impedance.

According to a second aspect of embodiments of the present application, there is provided a motor apparatus including: a motor; an inverter circuit (104) that converts direct current into three-phase alternating current according to three-phase voltage command values and supplies the three-phase alternating current to three-phase winding terminals of the motor (PM); a current sensor (107) that detects a current flowing from the inverter circuit to the motor; a U-phase current controller (114) for generating a U-phase voltage command value on the basis of the U-phase current command value and the U-phase current detected by the current sensor; a W-phase current controller (115) for generating a W-phase voltage command value on the basis of the W-phase current command value and the W-phase current detected by the current sensor; a V-phase voltage command calculator (116) that generates a V-phase voltage command value on the basis of the U-phase voltage command value output from the U-phase current controller and the W-phase voltage command value output from the W-phase current controller; a gate signal generator (105) that generates a gate signal for driving the inverter circuit, based on the U-phase voltage command value, the V-phase voltage command value, and the W-phase voltage command value; and parameter calculating means as described in the above first aspect.

According to a third aspect of the embodiments of the present application, there is provided a parameter calculation method of a motor to which three-phase alternating voltages obtained by converting direct-current voltages according to three-phase voltage command values by an inverter circuit are supplied, respectively, the parameter calculation method including:

calculating a q-axis impedance of the motor from a current flowing through the three-phase winding when a first single-phase alternating-current voltage is applied between all of three-phase winding terminals of the motor with the rotor of the motor at a first fixed position and the first single-phase alternating-current voltage, and calculating a q-axis inductance of the motor from the q-axis impedance; and calculating a d-axis impedance of the motor based on a current flowing through the two-phase winding when a second single-phase alternating current voltage is applied between two of the three-phase winding terminals of the motor with the rotor of the motor at a second fixed position, and the second single-phase alternating current voltage, and calculating a d-axis inductance of the motor based on the d-axis impedance.

The invention has the beneficial effects that: in the case where the motor rotor is held at a fixed position, a single-phase alternating current is applied between two of the three-phase winding terminals of the motor, whereby the d-axis inductance of the motor can be calculated with high accuracy.

Specific embodiments of the present invention are disclosed in detail with reference to the following description and drawings, indicating the manner in which the principles of the invention may be employed. It should be understood that the embodiments of the invention are not so limited in scope. The embodiments of the invention include many variations, modifications and equivalents within the spirit and scope of the appended claims.

Features that are described and/or illustrated with respect to one embodiment may be used in the same way or in a similar way in one or more other embodiments, in combination with or instead of the features of the other embodiments.

It should be emphasized that the term "comprises/comprising" when used herein, is taken to specify the presence of stated features, integers, steps or components but does not preclude the presence or addition of one or more other features, integers, steps or components.

Drawings

The accompanying drawings, which are included to provide a further understanding of the embodiments of the invention and are incorporated in and constitute a part of this specification, illustrate embodiments of the invention and together with the description serve to explain the principles of the invention. It is obvious that the drawings in the following description are only some embodiments of the invention, and that for a person skilled in the art, other drawings can be derived from them without inventive effort. In the drawings:

fig. 1 is a schematic view of a motor apparatus including a parameter calculation apparatus according to embodiment 1 of the present application;

fig. 2 is a timing chart when a direct-current voltage and a single-phase alternating-current voltage are applied to winding terminals of the motor in embodiment 1 of the present application;

fig. 3 is an equivalent circuit of a winding when a dc voltage is applied to a winding terminal of the motor in embodiment 1 of the present application;

fig. 4 is an equivalent circuit of windings when a single-phase alternating-current voltage is applied to three winding terminals of the motor in embodiment 1 of the present application;

fig. 5 is a schematic view of a fixed position of a rotor when a single-phase alternating-current voltage is applied to three winding terminals of the motor in the embodiment of the present application;

fig. 6 is a schematic diagram of the voltages and currents of the respective phases of the rotor when a single-phase alternating-current voltage is applied to three winding terminals of the motor in embodiment 1 of the present application;

fig. 7 is a schematic diagram of voltages and currents at a rotating coordinate when a single-phase alternating voltage is applied to three winding terminals of the motor of the present embodiment 1;

fig. 8 is an equivalent circuit of windings when a single-phase alternating-current voltage is applied to two winding terminals of the motor in embodiment 1 of the present application;

fig. 9 is a schematic view of a fixed position of a rotor when a single-phase alternating-current voltage is applied to two winding terminals of the motor in embodiment 1 of the present application;

fig. 10 is a schematic diagram of the voltages and currents of the respective phases of the rotor when a single-phase alternating voltage is applied to two winding terminals of the motor in embodiment 1 of the present application;

fig. 11 is a schematic view of voltage and current at a rotating coordinate when a single-phase alternating-current voltage is applied to two winding terminals of the motor in embodiment 1 of the present application;

fig. 12 shows an equivalent circuit of a phase winding when a rated voltage is applied to the motor and a rated current flows;

fig. 13 is a schematic diagram of an example in which a direct-current voltage and a single-phase alternating-current voltage are applied to winding terminals of the motor in the present embodiment;

fig. 14 is a schematic diagram of a parameter calculation method according to embodiment 2 of the present application.

Detailed Description

The foregoing and other features of the invention will become apparent from the following description taken in conjunction with the accompanying drawings. In the description and drawings, particular embodiments of the invention have been disclosed in detail as being indicative of some of the embodiments in which the principles of the invention may be employed, it being understood that the invention is not limited to the embodiments described, but, on the contrary, is intended to cover all modifications, variations, and equivalents falling within the scope of the appended claims.