JP2003284289A - Controller for cooling device for rotary electric machine - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To obtain a controller for cooling device for rotary electric machine wherein useless air blasting is eliminated for energy saving. <P>SOLUTION: The controller is so designed as to blow air onto a main motor 1 from a blower 2 and forcedly cool the motor. A cooling air quantity computing means 17 determines the quantity of cooling air to be blown based on measured data from an actual machine or actual machine model related to the relation at the load current of the main motor 1, the temperature of cooling air, and the temperature rise value of the main motor 1 so that the temperature of the main motor 1 will not exceed a predetermined value. A number of revolutions computing means 18 determines the number of revolutions of the blower for supplying the cooling air. A variable-voltage and a variable-frequency inverter 9 control the number of revolutions of the blower 2 through a motor 3 for the blower. Since the quantity of cooling air to be blown is determined based on the measured data from the actual machine or actual machine model, useless air blasting is eliminated and energy is saved. <P>COPYRIGHT: (C)2004,JPO

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to an improvement of a control device for a cooling device of a rotating electric machine, in which a rotating electric machine is forcedly cooled by a blower.

[0002]

2. Description of the Related Art FIG. 6 is a block diagram showing a conventional controller for a cooling device of an electric motor. In FIG. 6, the DC shunt type electric motor 1 has its interior forcedly cooled by a blower 2. The blower 2 is driven by a blower motor 3. Cooling air is supplied from the blower 2 to the electric motor 1 through the duct 4 to cool the electric motor 1 and raise the temperature of the air.
Emitted from. Air temperature sensors 7 and 8 are attached to the ducts 4 and 5, respectively, and emit signals corresponding to the air temperatures at the inlet and the outlet.

The temperature measuring device 91 comprises air temperature sensors 7, 8
The air temperature at the inlet and the outlet is measured based on the signal from. The temperature control device 92 adjusts the rotation speed of the blower motor 3 via the variable voltage variable frequency inverter 9 based on the temperatures of the air at the inlet and the outlet measured by the temperature measuring device 91 to blow the air from the blower 2. To control.
The temperature control device 92 controls the air flow rate so that the temperature of the air discharged from the duct 8 does not exceed a predetermined value even if the load of the electric motor 1 changes.

[0004]

The conventional control device for a cooling device is constructed as described above, and controls the air volume of the blower 2 so that the temperature of the air discharged from the electric motor 1 does not exceed a predetermined value. , There were the following problems. When the load of the electric motor 1 changes, the loss generated in the electric motor 1 changes, but there is a time delay between the temperature of the electric motor 1 and the temperature of the air discharged from the electric motor 1. For this reason, it is necessary to blow a sufficient amount of air so that the temperature of the electric motor 1 does not exceed the predetermined value, and even if the load fluctuation is particularly severe, the temperature of the electric motor 1 does not exceed the predetermined value. I had to do it. The power consumption of the blower motor 3 is large because the air volume has a margin. Further, when the air volume is adjusted by the damper, the flow passage is narrowed down for adjustment, so that wasteful energy is consumed. An object of the present invention is to solve the above-mentioned problems and to obtain a control device for a cooling device of a rotary electric machine that can save energy.

[0005]

In order to achieve the above object, in a controller for a cooling device of a rotating electric machine according to the present invention, a cooling device for blowing cooling air by a blower to forcibly cool the rotating electric machine. The temperature of the rotating electric machine is controlled based on the measured data by the actual machine or the actual machine model regarding the relationship between the load current of the rotating electric machine, the temperature of the cooling air, the air flow rate of the cooling air, and the temperature rise value of the rotating electric machine. An air volume control device is provided for controlling the air volume of the cooling air by determining the air volume of the cooling air to be blown so as not to exceed a predetermined value and adjusting the rotation speed of the blower. Since the air volume of the cooling air to be blown is obtained based on the measurement data of the actual machine or the model of the actual machine, it is possible to omit the unnecessary ventilation.

The cooling air is sent to the rotating electric machine through the duct, and the air volume control device feeds back the air volume calculated based on the wind speed of the cooling air flowing through the duct to adjust the rotation speed of the blower. It is characterized by controlling the air volume of the cooling air by doing so. Since the air volume is controlled by feeding back the air volume calculated based on the wind speed of the cooling air flowing through the duct, it is possible to reliably control the air volume.

Further, there are a plurality of rotating electric machines, and cooling air is blown from different blowers respectively, and the air volume control device has an air flow rate of the cooling air to be blown for one of the plurality of rotating electric machines. Is obtained, and the number of rotations of each blower is adjusted to the same number of revolutions to control the amount of cooling air blown to each of the plurality of rotating electric machines. Since the amount of cooling air to be blown for one of the rotary electric machines is obtained and the rotation speed of each blower is controlled, the air flow rate of each blower of a plurality of rotary electric machines can be controlled with a simple configuration.
Similarly, useless air blowing can be omitted.

Further, there are a plurality of rotary electric machines, and a cooling device for blowing cooling air to each rotary electric machine by a blower through a plurality of ducts branched from each other to control a cooling device for forced cooling is provided. The device controls each air volume of the cooling air blown to the plurality of rotating electric machines by obtaining the air volume of the cooling air to be blown for one of the plurality of rotating electric machines and adjusting the rotation speed of the blower. It is characterized by Since the amount of cooling air to be blown for one of the rotating electric machines is obtained and the rotation speed of the blower is controlled, the cooling air amounts of the plurality of rotating electric machines can be controlled with a simple configuration, and wasteful blowing is similarly omitted. be able to.

[0009]

BEST MODE FOR CARRYING OUT THE INVENTION Embodiment 1. 1 to 4 show an embodiment of the present invention. FIG. 1 is a configuration diagram showing a configuration of a cooling device control device, and FIG. 2 is a load current of an electric motor obtained by actual measurement and necessary for cooling. It is a characteristic diagram which shows the relationship of various ventilation volumes. FIG. 3 is an explanatory diagram showing the relationship between the air inlet temperature and the required air flow rate when the load current has a predetermined value, and FIG.
FIG. 4 is a characteristic diagram showing the relationship between the rotation speed of a blower and the amount of blown air.

In FIG. 1, a DC shunt type electric motor 1 is
The blower 2 cools the inside by forced ventilation. Blower 2
Is driven by the blower motor 3 at any rotation speed. Cooling air is supplied from the blower 2 to the electric motor 1 through the duct 4 to cool the electric motor 1 and raise the temperature of the air.
Emitted from. Air temperature sensors 7 and 8 are attached to the ducts 4 and 5, respectively, and emit signals corresponding to the air temperatures at the inlet and the outlet. Load current measuring means 12
Measures the load current of the electric motor 1 via the DC current transformer 11.

The inlet air temperature measuring means 14 measures the inlet air temperature based on a temperature signal from a temperature sensor 7 provided in the duct 4 on the inlet side. The blower motor control device 16 has a cooling air flow rate calculating means 17, and based on the air flow rate required for cooling the electric motor 1 obtained by the cooling air flow rate calculating means 17, the blower motor 3 is driven via the variable voltage variable frequency inverter 9. The number of rotations of the blower 2 is adjusted to control the amount of air blown by the blower 2. The blower motor control device 16 prevents the temperature of the armature winding and the field winding of the electric motor 1 from exceeding a predetermined value even when the load of the electric motor 1 fluctuates, and supplies a minimum necessary air volume. The motor 3 for control is controlled.

Next, the operation will be described. The cooling air flow rate calculation means 17 uses the load current J of the electric motor 1 measured by the load current measurement means 12 and the inlet temperature T of the cooling air measured by the inlet air temperature measurement means 14 to forcibly cool the electric motor 1 by ventilation. The required air flow rate Q is calculated. The cooling air flow rate calculation means 17 prevents the temperature of each winding of the armature and field of the electric motor 1 from exceeding an allowable value, and avoids wasting cooling air to increase the energy consumption of the blower motor 3. The required air flow rate Q is obtained as follows. It should be noted that a part of the heat generated in the electric motor 1 is released to the outside by radiation or conduction, but most of it is carried away by the air forcedly blown internally by the blower 2.

With respect to the actual machine or the actual machine model of the electric motor 1, when a certain load current J is applied, it is necessary to suppress the temperature of the winding to a predetermined temperature of 150 ° C. or less if it is an allowable temperature, for example, F class insulation. Blower amount Q, inlet air temperature T
Is determined as a parameter by actual measurement. FIG. 2 is an example of such actual measurement data. From the obtained actual measurement data of the relationship between the load current J and the required air flow rate Q, the relationship between the inlet air temperature T and the required air flow rate Q when the load current has a certain value J1 is shown in FIG. It is represented by a graph like this.
The predetermined temperature is set to a temperature slightly lower than 150 ° C. in consideration of manufacturing variations between the motor 1 used for measurement and the actually installed motor 1 to be controlled and the presence of hot spots. .

The cooling air flow rate calculating means 17 is based on the load current J1 of the electric motor 1 obtained from the load current measuring means 12 and the inlet air temperature measuring means 14 and the inlet air temperature T1 at that time. The required air flow rate Q1 is obtained from an approximate expression that approximates the curve. When the required air flow rate Q1 is obtained, the electric motor 18 rotates the rotation speed of the air blower motor 3 for blowing the required air flow rate Q1, that is, the rotation speed N1 of the air blower 2.
Is obtained from the approximate expression of the characteristic curve of FIG. 4, and the blower motor 3 is controlled via the variable voltage variable frequency inverter 9 so that the rotation speed becomes N1.

As described above, the required air flow rate Q is obtained from the load current J and the inlet air temperature T based on the actual measurement data of the actual machine or the actual machine model, and the blower motor 3 is controlled so as to blow the air quantity Q. Therefore, it is possible to reduce the energy consumption of the blower motor 3 by eliminating the wasteful air flow. Further, since the required air flow rate is obtained based on the actual measurement data obtained from the actual machine or the actual machine model, the accuracy of temperature control can be increased, and even when the load fluctuation is large,
It is possible to prevent overheating of the winding and save energy.

In the above embodiment, the cooling air flow rate calculating means 17 determines the required air flow rate Q to determine the rotation speed N of the blower motor 3. However, for example, a wind speed sensor is installed in the duct 4. Then, the blower motor 3 may be controlled via the variable voltage variable frequency inverter 9 so that the air volume thus obtained becomes the required air volume Q. Further, instead of calculating the relationship between the load current J, the inlet air temperature T, and the required air flow rate Q by using the approximate expression as described above, the measured data is used as the load current J, the inlet air temperature T, and the required air flow rate Q. The required air amount Q may be obtained by referring to the table.

Embodiment 2. FIG. 5 is a configuration diagram of a cooling device control device showing another embodiment of the present invention. In FIG. 5, two electric motors 1 having the same capacity are installed. Each electric motor 1 is cooled by a blower 2 driven by a blower motor 3. The two blower motors 3 are simultaneously controlled to an arbitrary rotation speed by one variable voltage variable frequency inverter 19. In this case, the variable voltage variable frequency inverter 19 includes two blower motors 3
Has a capacity capable of driving at the same time. Since other configurations are the same as those of the first embodiment shown in FIG. 1, corresponding components are designated by the same reference numerals and description thereof will be omitted.

When there are a plurality of electric motors 1 having the same capacity and the same load is applied to each of them, one of them is the same as in the embodiment shown in FIG.
Based on the measured data by the actual machine or the actual machine model regarding the relationship between the load current of one electric motor 1 by the cooling air flow calculation means 17, the temperature of the cooling air measured by the air temperature sensor 7, the air flow rate, and the temperature rise value of the electric motor 1. The amount of cooling air to be blown is determined so that the temperature of the electric motor 1 does not exceed a predetermined value. Then, the number of rotations of the blower 2 for supplying the cooling air to the electric motor 1 is obtained by the number-of-rotations calculation unit 18, and the variable-voltage variable-frequency inverter 19 is used to determine the respective blower motors 3
The rotation speed of the blower 2 is collectively controlled via the.

In the above, the case where the electric motors have the same capacity has been described, but the same capacity can be applied even if the electric capacity is not the same and there is some capacity difference.

According to this embodiment, when there are a plurality of electric motors 1 having the same capacity, the electric current and the inlet air temperature of one motor 1 are measured, and the air volume of the cooling air is collectively measured by one motor controller for the blower. Since the control is performed, it is possible to control the cooling air volumes of the plurality of electric motors with a simple configuration, and it is possible to save energy at low cost.

Embodiment 3. FIG. 6 is a configuration diagram of a cooling device control device according to another embodiment of the present invention. In FIG. 6, the electric motor 1, the second electric motor 21, and the third electric motor 31 having different capacities are cooled by one blower 22. That is, it is branched into the duct 4, the duct 24, and the duct 34 from the blower 22, and each of the electric motors 1, 21,
Cooling air is supplied to 31 in parallel. In addition, each electric motor 1,
The air that has cooled the second and third electric motors 21, 31 is discharged from the ducts 4, 24, 34. The blower 22 is
It is driven by the fan motor 23. The blower motor 23 is controlled by the variable voltage variable frequency inverter 29 to an arbitrary rotation speed. Since other configurations are the same as those of the first embodiment shown in FIG. 1, corresponding components are designated by the same reference numerals and description thereof will be omitted.

Also in this embodiment, as a representative, for example, the current of the electric motor 1 and the inlet temperature of the cooling air are measured,
The load current of the electric motor 1, the temperature of the cooling air, the air flow rate, and the electric motor 1
The amount of cooling air to be blown is determined so that the temperature of the electric motor 1 does not exceed a predetermined value based on the measured data of the actual machine or the model of the actual machine regarding the relationship with the temperature rise value. And
The rotation speed calculation means 18 obtains the rotation speed of the blower 22 for supplying the cooling air to the electric motor 1, and the variable voltage variable frequency inverter 39 controls the rotation speed of the blower 22 via the blower motor 23.

According to this embodiment, even when there are a plurality of electric motors having different capacities, the electric current and the inlet air temperature are measured for one of them as a representative, and one blower motor controller controls the cooling air flow. Since the air volume is controlled, the air volume of the cooling air of the plurality of electric motors can be controlled with a simple configuration, and energy saving can be achieved at low cost.

The electric motor or the auxiliary electric motor is not limited to the DC shunt winding electric motor, and even if it is a DC direct winding electric motor, an induction electric motor, a synchronous electric motor, or any other electric motor, actual measurement data is obtained for each actual electric machine or actual electric machine model to obtain the above-mentioned data. Energy can be saved by adjusting the amount of blown air as in each of the embodiments. Further, the electric motor is not limited to the one for forcedly ventilating the inside of the electric motor, and may be a fully closed type external ventilation type electric motor,
Has the same effect. Further, the rotating electric machine may be a generator.

[0025]

Since the present invention is constructed as described above, it has the following effects.

In the controller for the cooling device of the rotating electric machine of the present invention, the cooling device for blowing the cooling air by the blower to forcibly cool the rotating electric machine is controlled, and the load current of the rotating electric machine and the cooling air are controlled. Based on the measurement data by the actual machine or the model of the actual machine regarding the relationship between the temperature and the blowing rate of the cooling air and the temperature rise value of the rotating electrical machine, the air volume of the cooling air to be blown is determined so that the temperature of the rotating electrical machine does not exceed the predetermined value. Since it is equipped with an air volume control device that controls the air volume of the cooling air by adjusting the number of revolutions of the air blower, it is unnecessary to obtain the air volume of the cooling air to be blown based on the measurement data of the actual machine or the actual machine model. It is possible to save energy by eliminating unnecessary ventilation.

The cooling air is blown to the rotary electric machine through the duct, and the air volume control device adjusts the rotation speed of the blower by feeding back the air volume calculated based on the wind speed of the cooling air flowing through the duct. By controlling the air volume of the cooling air by controlling the air volume, the air volume calculated based on the air velocity of the cooling air flowing through the duct is fed back to control the air volume. Can be controlled.

Further, there are a plurality of rotating electric machines, and cooling air is blown from different blowers respectively, and the air volume control device has an amount of cooling air to be blown for one of the plurality of rotating electric machines. It is characterized in that it controls the amount of cooling air blown to each of a plurality of rotating electric machines by adjusting the number of rotations of each blower to the same number of rotations. Since the amount of cooling air to be blown is obtained and the rotation speed of each blower is controlled,
The air volume of each blower of a plurality of rotary electric machines can be controlled with a simple structure, and wasteful air blow can be similarly omitted to save energy.

Further, there are a plurality of rotating electric machines, and a cooling device that blows cooling air to each rotating electric machine by a blower through a plurality of ducts branched from each other to control a cooling device for forced cooling, and air volume control The device controls each air volume of the cooling air blown to the plurality of rotating electric machines by obtaining the air volume of the cooling air to be blown for one of the plurality of rotating electric machines and adjusting the rotation speed of the blower. Since it is characterized by controlling the rotation speed of the blower to obtain the air volume of the cooling air to be blown for one of the rotating electric machine, it is possible to control the cooling air volume of the plurality of rotating electric machine with a simple configuration,
Similarly, it is possible to save unnecessary air and save energy.

[Brief description of drawings]

FIG. 1 is a configuration diagram showing a configuration of a cooling device control device according to an embodiment of the present invention.

FIG. 2 is a characteristic diagram showing a relationship between a load current of an electric motor obtained by actual measurement and an air flow amount required for cooling.

FIG. 3 is an explanatory diagram showing a relationship between an air inlet temperature and a required air flow rate when a load current has a predetermined value.

FIG. 4 is a characteristic diagram showing a relationship between the number of revolutions of a blower and the amount of blown air.

FIG. 5 is a configuration diagram showing a configuration of a cooling device control device according to another embodiment of the present invention.

FIG. 6 is a configuration diagram showing a configuration of a cooling device control device according to another embodiment of the present invention.

FIG. 7 is a block diagram showing a conventional controller for a cooling device of an electric motor.

[Explanation of symbols]

DESCRIPTION OF SYMBOLS 1 electric motor, 2 blower, 3 blower motor, 9 variable voltage variable frequency inverter, 12 load current measuring means, 14 inlet air temperature measuring means, 16 blower motor control device, 17 cooling air volume calculating means, 18 rotational speed calculating means, 19 variable voltage variable frequency inverter, 21
Second electric motor, 22 blower, 23 blower motor,
24 duct, 29 variable voltage variable frequency inverter,
31 Third electric motor, 34 Duct.

Claims (4)

[Claims] 1. A cooling device for blowing cooling air by a blower to forcibly cool a rotating electric machine, comprising: a load current of the rotating electric machine; a temperature of the cooling air; a blowing amount of the cooling air; Based on the measurement data by the actual machine or the model of the actual machine regarding the relationship with the temperature rise value of the rotating electric machine, obtain the air volume of the cooling air to be blown so that the temperature of the rotating electric machine does not exceed a predetermined value, and determine the rotation speed of the blower. A controller for a cooling device of a rotating electrical machine, comprising an air volume control device for controlling the air volume of the cooling air by adjusting. 2. The cooling air is blown to the rotating electric machine through a duct, and the air volume control device feeds back the air volume calculated based on the wind speed of the cooling air flowing through the duct, and the rotation speed of the blower. The air flow rate of the cooling air is controlled by adjusting the air flow rate.
A controller for a cooling device of a rotating electric machine according to item 1. 3. A plurality of rotary electric machines are provided, and cooling air is blown from different blowers respectively, and the air volume control device controls the cooling air to be blown for one of the plurality of rotary electric machines. The rotating electric machine according to claim 1, wherein the amount of cooling air to be blown to each of the plurality of rotating electric machines is controlled by obtaining the amount of air and adjusting the rotating speed of each blower to the same rotating speed. Control device for the cooling system. 4. A rotating electric machine for controlling a cooling device for blowing cooling air to each rotating electric machine by a blower through a plurality of ducts branching from each other and forcibly cooling the rotating electric machine. The control device obtains the air volume of the cooling air to be blown for one of the plurality of rotary electric machines and adjusts the rotation speed of the blower to control each air volume of the cooling air to be blown to the plurality of rotary electric machines. The control device for the cooling device of the rotating electric machine according to claim 1, wherein the control device is a cooling device.