JPH09275664A - Motor controlling system - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a controlling system which can operate a motor efficiently over a long period of time. SOLUTION: A compressor 22 is driven by a command from a controller 28 and then a refrigerant cooled by a radiator 21 is supplied to a refrigerant channel in a casing 12 of a motor 11 and a refrigerant channel in a base 13 through control valves 24, 25. The controller 28 so controls the driving of the compressor 22 and the flow rates of the refrigerant in the control valves 24, 25 that the temperatures detected by a first and a second temperature sensor 26, 27 may be a first and a second set value.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a motor control system for driving and controlling a motor with a controller, and more particularly to a motor control system including a cooling device.

[0002]

2. Description of the Related Art A conventional motor control system is shown in FIG. A pump 3 and a radiator 4 are connected to a refrigerant passage formed in a casing of the motor 1 via a pipe 2, and a coolant such as water or oil is circulated between the motor 1 and the radiator 4 by the pump 3 so that the motor 1 is cooled. A controller 6 is electrically connected to the motor 1 via a wire harness 5. The controller 6 is for driving and controlling the motor 1, and is mounted on an aluminum base 8 having a cooling fan 7. The heat generated by the controller 6 by driving the cooling fan 7 is transmitted through the aluminum base 8. Dissipated into the atmosphere.

[0003]

In order to operate the motor 1 with high efficiency for a long time, it is necessary to keep the motor 1 and the controller 6 at optimum temperatures. However,
It is difficult to keep the motor 1 and the controller 6 at the optimum temperatures for a long time by simply circulating the coolant through the motor 1 by the pump 3 and cooling the controller 6 by the cooling fan 7.

The present invention has been made to solve the above problems, and an object thereof is to provide a motor control system capable of operating a motor efficiently for a long time.

[0005]

A motor control system according to the present invention is a motor in which a refrigerant passage is formed in a casing, a base in which a refrigerant passage is formed, a radiator, and a radiator and a refrigerant of the motor and the base. A pipe that connects the passages in parallel, a compressor that circulates the refrigerant between the radiator and the refrigerant passage of the motor and the base through the pipe, and a flow rate ratio of the refrigerant that flows into the refrigerant passage of the motor and the refrigerant passage of the base Control valve for
The first temperature sensor provided on the motor, the second temperature sensor provided on the base, the temperature mounted on the base and controlling the drive of the motor, and the temperatures detected by the first and second temperature sensors are The controller includes a controller that controls the compressor and the control valve so that the first and second set values are obtained. The motor and the base may be integrally die-cast with aluminum.

[0006]

Embodiments of the present invention will be described below with reference to the accompanying drawings. FIG. 1 shows a motor control system according to an embodiment of the present invention. The casing 12 and the base 13 of the motor 11 are integrally formed with each other by aluminum die casting. As shown in FIG. 2, a refrigerant passage 14 is formed in the casing 12 of the motor 11, and the pipes 1 are provided at both ends of the refrigerant passage 14, respectively.
5 and 16 are connected. On the other hand, as shown in FIG. 3, a refrigerant passage 17 is formed inside the base 13 as well, and pipes 18 and 19 are provided at both ends of the refrigerant passage 17, respectively.
Is connected.

As shown in FIG. 1, pipes 15 and 18
Is connected to the refrigerant inlet of the radiator 21 in a state where it joins the single pipe 20. A compressor 22 is connected to the refrigerant delivery port of the radiator 21, and a pipe 23 connected to the compressor 22 is bifurcated and connected to the pipes 16 and 19, respectively. These pipes 1
6 and 19 are provided with control valves 24 and 25, respectively. Thus, the refrigerant passage 14 in the motor 11 and the refrigerant passage 17 in the base 13 are connected in parallel to the radiator 21 and the compressor 22 to form a refrigerant circulation path.

The motor 11 and the base 13 have a first temperature sensor 26 and a second temperature sensor 26 for detecting respective temperatures.
Temperature sensor 27 is provided. In addition, base 13
The controller 28 is mounted on the controller 28. The motor 11 is electrically connected to the controller 28 via the wire harness 29, and the compressor 22, the control valves 24 and 25, and the first and second temperature sensors 26 and 27 are connected to the controller 28. Each is electrically connected. The radiator 21 is connected to a reserve tank 30 for securing a liquid amount of the refrigerant, and a fan shroud 31 is provided in the vicinity of the radiator 22. Reference numeral 32 is a wire harness for supplying power to the controller 28 from a battery (not shown) or the like.

Next, the operation of this motor control system will be described. First, the compressor 22 is driven by a command from the controller 28, and a refrigerant made of water or oil circulates in the circulation path. That is, the refrigerant is cooled when passing through the radiator 21, and further cooled by the compressor 22, and then the control valve 24
And the refrigerant passage 14 in the motor 11 via
And to the refrigerant passage 17 of the base 13. After passing through these refrigerant passages 14 and 17, the refrigerant merges from the pipes 15 and 18 into the pipe 20, and enters the radiator 21 again.

Here, the refrigerant passage 14 is branched into a number of passages around the bearing portion supporting the motor shaft in the casing 12 of the motor 11 and along the inside of the outer peripheral surface of the casing 12, and these passages are provided. By passing the refrigerant through the motor 11, the motor 11 is efficiently cooled as a whole. Similarly, the refrigerant passage 17 is branched into a large number of passages inside the base 13, and the refrigerant passes through these passages, whereby the base 13 is cooled efficiently as a whole.

The temperatures of the motor 11 and the base 13 thus cooled are detected by the first and second temperature sensors 26 and 27, respectively, and transmitted to the controller 28. The controller 28 stores in advance a first set value indicating the optimum temperature of the motor 11 and a second set value indicating the temperature of the base 13 when the controller 28 reaches the optimum temperature. The flow rate in the drive of the compressor 22 and the control valves 24 and 25 is controlled so that the temperatures detected by 27 become the first and second set values, respectively.

As described above, according to this motor control system, the motor 11 and the controller 28 can be maintained at their respective optimum temperatures, and the motor 11 can be operated with high efficiency for a long time.

First and second temperature sensors 26 and 27
Although each one is provided in the motor 11 and the base 13, respectively, the temperature can be more accurately managed by disposing a plurality of temperature sensors in the motor 11 and the base 13 in a dispersed manner.

Although the casing 12 and the base 13 of the motor 11 are formed integrally with each other, the present invention is not limited to this, and as shown in FIG. 4, the motor 41 and the base 43 formed independently of each other are provided. Even if placed separately, the same effect can be obtained.

Further, in the system of FIG. 1, the refrigerant in the pipes 15 and 18 merges in the pipe 20, and the refrigerant in the pipe 23 is divided into the pipes 16 and 19. Instead of 23, a pipe 3 whose inside is divided into two layers by providing a separation wall in the center as shown in FIG.
5 can also be used. In this case, as shown in FIG. 6, an opening is formed in the separation wall in the pipe 35, and a valve element 36 that opens and closes in a hinge manner is provided in this opening so that the angle of the valve element 36 can be controlled May be arranged at any one place of the pipe 35 instead of the control valves 24 and 25. By adjusting the angle of the valve element 36, the flow rate ratio of the refrigerant in each layer of the pipe 35, that is, the motor 11
The flow rate ratio of the refrigerant flowing in the refrigerant passage 14 of the base 13 and the refrigerant passage 17 of the base 13 is controlled. By using such a pipe 35 and the control valve having the structure shown in FIG. 6, there is an advantage that only one control valve is required.

In the above description, the case where the motor and the controller are cooled by the refrigerant has been described. However, in a cold region or the like, the system of the present invention warms the motor and the controller with the refrigerant (temperature medium) to obtain the optimum temperature. can do.

[Brief description of drawings]

FIG. 1 is a perspective view showing a motor control system according to an embodiment of the present invention.

FIG. 2 is a perspective view showing a motor portion used in the embodiment.

FIG. 3 is a perspective view showing a base portion used in the embodiment.

FIG. 4 is a perspective view showing a motor and a base according to another embodiment.

FIG. 5 is a cross-sectional view showing a modified example of piping.

FIG. 6 is a cross-sectional view showing a control valve used in a pipe according to a modification.

FIG. 7 is a perspective view showing a conventional motor control system.

[Explanation of symbols]

 11, 33 Motor 12 Casing 13, 34 Base 14, 17 Refrigerant passages 15, 16, 18, 18, 19, 20, 23, 35 Piping 21 Radiator 22 Compressor 24, 25 Control valve 26 First temperature sensor 27 Second temperature sensor 28 controller 29, 32 wire harness 36 valve body

Claims (2)

[Claims] 1. A motor having a refrigerant passage formed in a casing, a base having a refrigerant passage formed therein, a radiator, and piping for connecting the motor and the refrigerant passage of the base in parallel to the radiator, A compressor for circulating a refrigerant between the radiator and the refrigerant passage of the motor and the base through a pipe, and a control valve for adjusting the flow rate ratio of the refrigerant flowing in the refrigerant passage of the motor and the refrigerant passage of the base. A first temperature sensor provided on the motor, a second temperature sensor provided on the base, a first temperature sensor mounted on the base and drivingly controlling the motor, and the first and second temperatures. The compressor and the control valve are controlled so that the temperatures detected by the sensors become the first and second set values, respectively. Motor control system is characterized in that a controller. 2. The system according to claim 1, wherein the motor and the base are integrally molded by aluminum die casting.