阅读说明：本技术 一种电机转子温度的估算方法、装置、电机和存储介质 (Method and device for estimating temperature of motor rotor, motor and storage medium ) 是由 潘忠亮 李帅 刘亚川 范雨卉 李岩 李伟亮 李芝炳 于 2019-09-24 设计创作，主要内容包括：本发明实施例公开了一种电机转子温度的估算方法、装置、电机和存储介质。其中,该方法包括：根据电机转子的功率损耗、电机转子的关联组件中实体组件的功率损耗、关联组件中外部组件的温度、以及电机转子和关联组件的热导,计算电机转子的稳态温度；根据电机转子的负载参数查找出对应的温度传递标定参数；根据所述温度传递标定参数调整电机转子的稳态温度,得到电机转子的瞬态温度。本发明实施例提供的技术方案,使得估算出的电机转子的瞬态温度能够实时跟随对应的实际温度,实现对电机转子温度的实时监控,提高电机转子温度的准确性,同时减少使用温度传感器检测电机转子温度时带来的成本增加及故障率增加,保证电机运行的成功率。(The embodiment of the invention discloses a method and a device for estimating the temperature of a motor rotor, a motor and a storage medium. Wherein, the method comprises the following steps: calculating the steady-state temperature of the motor rotor according to the power loss of the motor rotor, the power loss of an entity assembly in an associated assembly of the motor rotor, the temperature of an external assembly in the associated assembly and the thermal conductance of the motor rotor and the associated assembly; finding out corresponding temperature transfer calibration parameters according to the load parameters of the motor rotor; and adjusting the steady-state temperature of the motor rotor according to the temperature transfer calibration parameter to obtain the transient temperature of the motor rotor. According to the technical scheme provided by the embodiment of the invention, the estimated transient temperature of the motor rotor can follow the corresponding actual temperature in real time, so that the real-time monitoring of the temperature of the motor rotor is realized, the accuracy of the temperature of the motor rotor is improved, the cost increase and the fault rate increase caused by using a temperature sensor to detect the temperature of the motor rotor are reduced, and the success rate of the motor operation is ensured.)

1. A method of estimating a temperature of a rotor of an electric machine, comprising:

calculating the steady-state temperature of the motor rotor according to the power loss of the motor rotor, the power loss of a solid component in an associated component of the motor rotor, the temperature of an external component in the associated component and the thermal conductance of the motor rotor and the associated component;

finding out corresponding temperature transfer calibration parameters according to the load parameters of the motor rotor;

and adjusting the steady-state temperature of the motor rotor according to the temperature transfer calibration parameter to obtain the transient temperature of the motor rotor.

2. The method of claim 1, wherein the associated components comprise a solid component comprising a stator core and stator windings, a transmission component comprising a stator insulation medium and stator and rotor air gaps, and an external component comprising a stator cooling water component.

3. The method of claim 1, further comprising, prior to calculating the steady state temperature of the motor rotor:

detecting the temperature of the external component, and respectively calculating the power loss of the motor rotor and the power loss of the entity component according to the load parameters of the motor rotor;

calculating a corresponding thermal conductance based on structural characteristics of the motor rotor and the associated components.

4. The method of claim 1, wherein adjusting the steady state temperature of the motor rotor based on the temperature transfer calibration parameter to obtain the transient temperature of the motor rotor comprises:

determining a corresponding temperature transfer function according to the temperature transfer calibration parameter;

and inputting the steady-state temperature of the motor rotor into the temperature transfer function to obtain the transient temperature of the motor rotor.

5. A method according to any of claims 2-4, characterized in that the steady-state temperature of the rotor of the electric machine is calculated as follows:

wherein G is₁₁For heat conduction of the stator core, G₁₂And G₂₁Thermal conductance, G, both of stator insulating media₂₂For heat conduction of the stator winding, G₂₃And G₃₂Thermal conductance of both stator and rotor air gaps, G₃₃Is the heat conduction of the rotor of the machine, G_1aFor heat conduction of stator cooling water assembly, theta₁、θ₂And theta_aTemperatures, θ, of stator core, stator winding and stator cooling water assembly, respectively_{stable_time}Is the steady state temperature, p, of the rotor of the machine₁、p₂And p₃The power losses of the stator core, the stator winding and the motor rotor are respectively.

6. The method of any of claims 1-4, further comprising, after obtaining the transient temperature of the rotor of the electric machine:

and compensating the motor torque according to the transient temperature of the motor rotor.

7. An apparatus for estimating a temperature of a rotor of an electric machine, comprising:

the steady-state temperature calculation module is used for calculating the steady-state temperature of the motor rotor according to the power loss of the motor rotor, the power loss of a solid component in an associated component of the motor rotor, the temperature of an external component in the associated component and the thermal conductance of the motor rotor and the associated component;

the calibration parameter searching module is used for searching out corresponding temperature transfer calibration parameters according to the load parameters of the motor rotor;

and the transient temperature estimation module is used for adjusting the steady-state temperature of the motor rotor according to the temperature transfer calibration parameter to obtain the transient temperature of the motor rotor.

8. The apparatus of claim 7, wherein the associated components comprise a solid component comprising a stator core and stator windings, a transmission component comprising a stator insulation medium and stator and rotor air gaps, and an external component comprising a stator cooling water component.

9. An electric machine, characterized in that the electric machine comprises:

one or more processors;

a storage device for storing one or more programs,

when executed by the one or more processors, cause the one or more processors to implement a method of estimating a rotor temperature of an electric machine as claimed in any one of claims 1 to 6.

10. A computer-readable storage medium, on which a computer program is stored which, when being executed by a processor, carries out the method of estimating the temperature of a rotor of an electric machine according to any one of claims 1-6.

Technical Field

The embodiment of the invention relates to the technical field of vehicle data processing, in particular to a method and a device for estimating the temperature of a motor rotor, a motor and a storage medium.

Background

At present, a permanent magnet synchronous motor comprises a stator and a rotor, wherein the stator refers to a fixed part in the motor, and the rotor is a rotatable part in the motor. Under the condition of load, the temperature of a rotor of the permanent magnet synchronous motor changes along with the change of time, the permanent magnet flux linkage in the motor is correspondingly changed due to the change of the temperature of the rotor, and the torque precision output by the motor is influenced by the change of the flux linkage of the motor. The permanent magnet in the motor is located inside the rotor, and it is difficult to install a temperature sensor configured to detect the permanent magnet, and if a wireless transmission temperature sensor is used, the cost is very high.

The existing motor rotor temperature is estimated only by referring to individual parameters such as motor stator loss and rotor loss generally, and various parameters related to the change of the motor rotor temperature are not analyzed, so that the estimated motor rotor temperature precision has certain deviation.

Disclosure of Invention

The embodiment of the invention provides a method and a device for estimating the temperature of a motor rotor, a motor and a storage medium, which are used for realizing real-time monitoring of the temperature of the motor rotor and improving the accuracy of the transient temperature of the motor rotor.

In a first aspect, an embodiment of the present invention provides a method for estimating a rotor temperature of an electric machine, where the method includes:

calculating the steady-state temperature of the motor rotor according to the power loss of the motor rotor, the power loss of a solid component in an associated component of the motor rotor, the temperature of an external component in the associated component and the thermal conductance of the motor rotor and the associated component;

finding out corresponding temperature transfer calibration parameters according to the load parameters of the motor rotor;

and adjusting the steady-state temperature of the motor rotor according to the temperature transfer calibration parameter to obtain the transient temperature of the motor rotor.

In a second aspect, an embodiment of the present invention provides an apparatus for estimating an electronic rotor temperature, the apparatus including:

the steady-state temperature calculation module is used for calculating the steady-state temperature of the motor rotor according to the power loss of the motor rotor, the power loss of a solid component in an associated component of the motor rotor, the temperature of an external component in the associated component and the thermal conductance of the motor rotor and the associated component;

the calibration parameter searching module is used for searching out corresponding temperature transfer calibration parameters according to the load parameters of the motor rotor;

and the transient temperature estimation module is used for adjusting the steady-state temperature of the motor rotor according to the temperature transfer calibration parameter to obtain the transient temperature of the motor rotor.

In a third aspect, an embodiment of the present invention provides an electric machine, including:

one or more processors;

a storage device for storing one or more programs,

when executed by the one or more processors, cause the one or more processors to implement a method of estimating a rotor temperature of an electric machine according to any embodiment of the invention.

In a fourth aspect, embodiments of the present invention provide a computer-readable storage medium, on which a computer program is stored, where the computer program, when executed by a processor, implements a method for estimating a rotor temperature of an electric machine according to any of the embodiments of the present invention.

The embodiment of the invention provides a method and a device for estimating the temperature of a motor rotor, a motor and a storage medium, the steady-state temperature of the motor rotor is calculated according to the power loss of the motor rotor, the power loss of an entity component in an associated component of the motor rotor, the temperature of an external component in the associated component and the thermal conductance of the motor rotor and the associated component, a corresponding temperature transmission calibration parameter is searched according to the load parameter of the motor rotor, the steady-state temperature of the motor rotor is adjusted by adopting the temperature transmission calibration parameter subsequently to obtain the transient temperature of the motor rotor, so that the estimated transient temperature of the motor rotor can follow the corresponding actual temperature in real time, the real-time monitoring of the temperature of the motor rotor is realized, the accuracy of the temperature of the motor rotor is improved, and the cost increase and the fault rate increase brought when the temperature of the motor rotor is detected by using a temperature sensor, the success rate of the motor operation is ensured.

Drawings

Other features, objects and advantages of the invention will become more apparent upon reading of the detailed description of non-limiting embodiments made with reference to the following drawings:

fig. 1A is a flowchart of a method for estimating a rotor temperature of a motor according to an embodiment of the present invention;

fig. 1B is a schematic thermal circuit diagram of heat exchange of the motor in the method according to the first embodiment of the present invention;

fig. 2 is a flowchart of a method for estimating a rotor temperature of a motor according to a second embodiment of the present invention;

fig. 3 is a schematic structural diagram of an estimation apparatus for a rotor temperature of a motor according to a third embodiment of the present invention;

fig. 4 is a schematic structural diagram of a motor according to a fourth embodiment of the present invention.

Detailed Description

The present invention will be described in further detail with reference to the accompanying drawings and examples. It is to be understood that the specific embodiments described herein are merely illustrative of the invention and are not limiting of the invention. It should be further noted that, for the convenience of description, only some of the structures related to the present invention are shown in the drawings, not all of the structures.