JP3307251B2 - Insulating material protection device and temperature control device for rotating machine - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a protection device for an insulating material and a temperature control device for a rotating machine, and more particularly to a technique for preventing deterioration or destruction of the insulating material due to a temperature rise.

[0002]

2. Description of the Related Art In recent years, technical development of electric vehicles and hybrid vehicles has been advanced from the viewpoint of low pollution and energy saving. When using electric or hybrid motors for driving or generating electric motors, maintain the winding temperature below the maximum allowable temperature according to the type of insulating material to avoid insulation breakdown of the windings due to temperature rise. There is a need. For example, according to JEC (Electrical Institute of Electrical Engineers Standards Standard) -146 or the like, if the winding is H-class insulated, continuous use of the motor at a temperature exceeding 165 ° C should be avoided. To the effect.

On the other hand, in a conventional electric vehicle or hybrid vehicle, for example, Japanese Utility Model Application Laid-Open No. 59-1265.
As described in Japanese Patent Application Publication No. 99-99, when the winding temperature exceeds the allowable maximum temperature even instantaneously, a control for limiting the current supplied to the winding for cooling the winding has been performed.

[0004]

However, the conventional control method has a problem that the temperature performance of the insulating material cannot be maximized.

That is, the maximum allowable temperature of an insulating material, which has been generally adopted, indicates that if the insulating material is used continuously for a certain period of time or more, the insulating material is degraded or destroyed. Does not indicate that the insulating material will be degraded or destroyed even if it reaches even momentarily. Therefore, in the above-described conventional temperature control method, the supply current to the windings which is not originally required is limited for a short-term temperature rise, so that the temperature performance of the insulating material is maximized. I couldn't do it.

For example, when an electric vehicle adopting the conventional temperature control method travels on a hill with the accelerator fully opened in a state where the motor is sufficiently warmed up, the winding temperature of the motor reaches the allowable maximum temperature. In some cases, the output of the electric motor was restricted, and in some cases it was not possible to climb the slope. However, it is considered that such an output restriction of the electric motor was originally unnecessary in some cases.

[0007] These problems are not limited to problems relating to the insulating material used as the winding coating of the electric motor, but are problems relating to the entire insulating material. A technique for maximizing the temperature performance of the insulating material is desired. I was

SUMMARY OF THE INVENTION The present invention has been made in view of the above problems, and has as its object to provide an insulation material protection device and a rotating machine temperature control device capable of maximizing the temperature performance of the insulation material. .

[0009]

[0010]

[0011]

[0012]

[Means for Solving the Problems] In order to solve the above-mentioned problems
According to a first aspect of the present invention, there is provided an insulating material temperature detecting means for detecting a temperature of the insulating material, and a temperature of the insulating material after a first time point based on the temperature detected by the insulating material temperature detecting means. First temperature trend information calculating means for calculating first temperature trend information indicating a tendency of transition, and a second temperature after the first time based on a temperature detected by the insulating material temperature detecting means. A second temperature trend information calculating means for calculating second temperature trend information indicating a tendency of a temperature transition of the insulating material after the time point, and a first temperature trend calculated by the first temperature trend information calculating means. And insulating material temperature control means for controlling the temperature of the insulating material based on at least two pieces of temperature trend information calculated by the second temperature trend information calculating means. It is characterized by the following.

According to the first aspect of the present invention, the first
The temperature trend information calculating means calculates first temperature trend information such as a moving average value and a moving integrated average value after the first time based on the temperature detected by the insulating material temperature detecting means. The second temperature trend information calculating means may be configured to calculate a moving average value or a moving integrated average value after a second time point after the first time point based on the temperature detected by the insulating material temperature detecting means. And the like.
The second time point may be a temperature detection time point by the insulating material temperature detecting means. In this case, as the second temperature tendency information, for example, an instantaneous value of the temperature at that time point can be adopted.

The insulating material temperature control means controls the driving of the cooling fan and the current based on at least two pieces of the temperature tendency information of the first temperature tendency information and the second temperature trend information calculated in this manner. Or by controlling the voltage, etc.
Control the temperature of the insulating material.

This makes it possible to appropriately cope with a rapid temperature rise or a gradual temperature rise, as compared with the conventional method in which only the instantaneous temperature at the time of detection is used as a control amount. Temperature performance can be maximized. As a result, it is possible to obviate the need for various temperature countermeasures such as an increase in the cooling surface area, installation of a large-sized cooling fan, an increase in the size of the radiator, and an increase in the performance of the insulating material.

[0016]

[0017]

[0018]

According to a second aspect of the present invention, there is provided an insulating material temperature detecting means for detecting a temperature of an insulating material covering a winding of a rotating machine, and a first detecting means for detecting a temperature of the insulating material based on the temperature detected by the insulating material temperature detecting means. A first temperature trend information calculating means for calculating first temperature trend information indicating a tendency of a temperature transition of the insulating material after the time point, and the first temperature trend information based on the temperature detected by the insulating material temperature detecting means. A second temperature trend information calculating means for calculating second temperature trend information indicating a tendency of a temperature transition of the insulating material after a second time point after the time point, and the first temperature trend information calculating means. Insulation for controlling the temperature of the insulating material based on at least two pieces of temperature tendency information, the first temperature trend information calculated and the second temperature trend information calculated by the second temperature trend information calculating means. Material temperature control means Characterized in that it comprises a.

According to the second aspect of the present invention, the insulating material temperature detecting means detects the temperature of the insulating material covering the winding of a rotating machine such as a motor or a generator, and obtains the first temperature trend information. The calculating means calculates first temperature trend information such as a moving average value and a moving integrated average value after the first time based on the temperature detected by the insulating material temperature detecting means. The second temperature trend information calculating means may be configured to calculate a moving average value or a moving integrated average value after a second time point after the first time point based on the temperature detected by the insulating material temperature detecting means. And the like. The second time point may be a temperature detection time point by the insulating material temperature detecting means. In this case, as the second temperature tendency information, for example, an instantaneous value of the temperature at that time point can be adopted.

The insulating material temperature control means controls the driving of the cooling fan and the electric motor based on at least two pieces of the temperature tendency information of the first temperature tendency information and the second temperature tendency information thus calculated. The temperature of the insulating material is controlled by controlling the supply current or the supply voltage, or controlling the driving speed of the generator.

This makes it possible to appropriately deal with a rapid or gradual temperature rise, as compared with the conventional method in which only the instantaneous temperature at the time of detection is used as the control amount. Temperature performance can be maximized. As a result, it is possible to obviate the need for various temperature countermeasures such as an increase in the cooling surface area, installation of a large-sized cooling fan, an increase in the size of the radiator, and an increase in the performance of the insulating material.

[0023]

Embodiments of the present invention will be described below in detail with reference to the drawings.

First, an example in which the present invention is applied to temperature control of an insulating material applied to a winding of a motor for driving an electric vehicle will be described.

FIG. 1 is a diagram showing a configuration of a control system for a driving motor of an electric vehicle. As shown in the figure, the present system is an electronic control that controls the inverter 12 based on a temperature signal input from the electric motor 10, the inverter 12, and the temperature sensor 14 and an accelerator pedal depression amount signal input from the accelerator sensor 16. Device (ECU) 18. Here, the temperature sensor 14 is a means for directly or indirectly detecting the temperature of the insulating material covering the windings of the stator and the rotor of the electric motor 10.

The output shaft of the electric motor 10 is connected to a tire via a speed reducer (not shown), and the rotation drives the tire to drive the vehicle. This electric motor 10
Is an AC synchronous motor, which is driven by a predetermined AC current. The AC current is obtained by converting a DC current from a battery (not shown) by the inverter 12.

The inverter 12 has a plurality of switching transistors. The switching of the switching transistors is controlled by the ECU 18 to generate an AC current to be supplied to the electric motor 10.

The ECU 18 includes a drive control unit 20, an insulating material temperature control unit 22, and a temperature tendency information calculation unit 24. The drive control unit 20 includes the accelerator 2
6. The accelerator pedal depression amount signal input from the accelerator sensor 16 for detecting the depression amount of the accelerator 6 and the insulating material temperature controller 22
Motor 10 in response to torque throttle information input from
, And the switching of the inverter 12 is controlled.

The insulating material temperature control unit 22 generates torque reduction information for controlling the temperature of the insulating material covering the windings of the electric motor 10 based on the temperature tendency information input from the temperature tendency information calculation unit 24. Output to 20.

The temperature trend information calculation unit 24 includes the temperature sensor 1
Based on the temperature detected by 4, temperature tendency information indicating the tendency of the temperature transition of the insulating material covering the winding of the electric motor 10 is calculated and output to the insulating material temperature control unit 22. Specifically, the temperature trend information calculation unit 24 stores the temperature history memory 241
And a temperature history calculation unit 242.

The temperature history memory 241 is a memory for storing the temperature output from the temperature sensor 14 every predetermined time from 15 minutes before to the present time as temperature history information. Further, the temperature history calculation unit 242 stores the temperature history memory 2
The temperature tendency information is calculated and output based on the temperature history information stored in 41.

Next, the electric motor 10 is controlled by the ECU 18.
Will be described with reference to the flowchart shown in FIG.

As shown in the figure, first, based on the temperature history information stored in the temperature history memory 241, the temperature history calculation unit 242 calculates a moving average as temperature trend information for 10 seconds from 10 seconds ago to the present time. A value Tmot10 is calculated, and a moving average value Tmot15 is calculated as temperature tendency information for 15 minutes from 15 minutes ago to the present time (S1). Then, those values are output to the insulating material temperature controller 22.
In this case, the temperature trend information for 15 minutes is adopted in order to adopt the temperature trend information of the period approximately equal to the thermal time constant of the electric motor 10 as the control amount. However, the length of the target period of the temperature trend information is as follows. What is necessary is just to determine according to various conditions other than the material of an electric motor.

Next, the insulating material temperature control unit 22 operates as shown in FIG.
Based on the relationship diagram shown in FIG.
A torque reduction coefficient kTmot10 corresponding to 0 is calculated (S2), and a torque reduction coefficient kTmot15 corresponding to the moving average value Tmot15 is calculated based on the relationship diagram shown in FIG. 3B (S3). Here, FIG. 3A is a diagram showing the correspondence between the moving average temperature Tmot10 and the value of the torque reduction coefficient kTmot10 at the value of the moving average temperature Tmot10, and FIG. Temperature Tmot15 and torque reduction coefficient kTmot15 at the value of the moving average temperature Tmot15
It is a figure showing the correspondence of the value of. In these figures, the torque restriction coefficient represents a ratio of a necessary limit to a torque instruction value output from the drive control unit 20 to the inverter 12 at each moving average temperature.

Next, the insulating material temperature controller 22 compares the torque reduction coefficient kTmot10 with the torque reduction coefficient kTmot15 (S4), and when kTmot15 is smaller than kTmot10, adopts kTmot15 as the torque reduction coefficient. The value is output to the drive control unit 20 as the torque reduction coefficient kTmot (S5). When kTmot10 is equal to or smaller than kTmot15, kTmot10 is adopted as a torque reduction coefficient,
The value is used as the torque reduction coefficient kTmot as the drive control unit 20.
(S6).

Thereafter, the drive control unit 20 multiplies the required torque Tmot separately calculated based on the accelerator pedal depression amount signal from the accelerator sensor 16 by the torque throttle coefficient kTmot thus output from the temperature history calculation unit 242. Is output to the inverter 12 as an actual torque command value.

By performing the above-described processing every second and controlling the output torque of the motor 10, the temperature performance of the insulating material used as the winding coating of the motor 10 can be maximized.

That is, a relatively short-term moving average temperature Tmo
By monitoring a rapid temperature rise based on t10 and monitoring a gradual temperature rise based on a relatively long-term moving average temperature Tmot15, only the instantaneous temperature at the time of detection is used as a control amount as in the related art. Compared with the method, the temperature performance of the insulating material can be maximized by appropriately coping with various modes of temperature rise. As a result, it is possible to eliminate the need for various temperature countermeasures such as increasing the cooling surface area of the electric motor 10, installing a large-sized cooling fan, increasing the size of the radiator, improving the performance of the insulating material, and increasing the cost and installation space. it can.

The embodiment of the present invention described above can be variously modified. For example, the EC described above
In U18, the temperature was controlled by restricting the power supplied to the electric motor 10, but the flow rate was controlled by providing a cooling fan on the side of the electric motor 10 to control the air volume, or by employing a water cooling system. May be used to control the temperature. Further, these controls may be appropriately combined and adopted.

Further, in the above embodiment, the temperature control of the insulating material covering the windings of the driving motor 10 of the electric vehicle has been described. However, the temperature control is similarly applied to all other rotating machines such as motors and generators. Control can be performed. In addition, the above-described temperature control can be similarly applied to insulation provided to various electric components.

When the present invention is applied to the insulating material covering the windings of the generator, for example, the temperature can be easily controlled by controlling the driving speed.

In the above embodiment, the two moving average temperatures Tmot10 and Tmot15 are calculated and the torque reduction coefficient Tmot to be output to the drive control unit is determined. Control can also be performed. In the above description, the moving average temperature Tmot10 for 10 seconds is adopted as the relatively short-term temperature tendency information.
Further, as the short-term temperature tendency information, an instantaneous value of the temperature of the insulating material at the time of the above processing may be employed.

[Brief description of the drawings]

FIG. 1 is a diagram showing a configuration of a control system for a driving motor of an electric vehicle.

FIG. 2 is a flowchart illustrating drive control of an electric motor by an ECU.

FIG. 3 is a diagram illustrating a correspondence between a moving average temperature and a value of a torque reduction coefficient at the value of the moving average temperature.

[Explanation of symbols]

10 electric motor, 14 temperature sensor, 18 ECU, 22
Insulating material temperature controller, 24 temperature trend information calculator.

Claims (2)

(57) [Claims] 1. An insulating material temperature detecting means for detecting a temperature of an insulating material, and a temperature transition of the insulating material after a first time point based on the temperature detected by the insulating material temperature detecting means. A first temperature trend information calculating means for calculating the first temperature trend information; and an insulating material after a second time point after the first time point based on the temperature detected by the insulating material temperature detecting means. Second temperature trend information calculating means for calculating second temperature trend information indicating the tendency of the temperature transition, and first temperature trend information calculating means for calculating the first temperature trend information.
Insulating temperature control means for controlling the temperature of the insulating material based on at least two pieces of temperature trend information of the temperature trend information and the second temperature trend information calculated by the second temperature trend information calculating means. A device for protecting an insulating material, comprising: 2. An insulating material temperature detecting means for detecting a temperature of an insulating material covering a winding of a rotating machine, and detecting the temperature of the insulating material after a first time based on the temperature detected by the insulating material temperature detecting means. First temperature trend information calculating means for calculating first temperature trend information representing a tendency of temperature transition; and a second temperature trend information after the first time based on the temperature detected by the insulating material temperature detecting means. Second temperature trend information calculating means for calculating second temperature trend information indicating the tendency of the temperature transition of the insulating material after the second time point; and first temperature trend information calculated by the first temperature trend information calculating means.
Insulating temperature control means for controlling the temperature of the insulating material based on at least two pieces of temperature trend information of the temperature trend information and the second temperature trend information calculated by the second temperature trend information calculating means. A temperature control device for a rotating machine, comprising: