Cooling controller of motor

Abstract

To provide a cooling controller of a motor, which can suppress uneven oil application since an oil supply direction changes by increase or decrease of a drive instruction value.SOLUTION: A cooling controller of a motor includes: a pipe having a supply passage which can supply oil to a coil end at an angle from a vertical direction at an upper part of a mounting direction of the motor; an electric oil pump which pumps oil into the pipe; and a control part for increasing and decreasing a delivery amount of oil within prescribed time.SELECTED DRAWING: Figure 1

Description

[Technical Field]

[0001] The present invention relates to a motor cooling control device. [Background technology]

[0002] Patent Document 1 describes that, in order to ensure the dielectric strength of the stator coil of a vehicle motor, an electric oil pump is driven in response to atmospheric pressure and oil is sprayed onto the stator coil from an overhead pipe for cooling the motor. [Prior art documents] [Patent documents]

[0003] [Patent Document 1] Japanese Patent Application Publication No. 2023-22769 Summary of the Invention [Problem to be solved by the invention]

[0004] However, if the oil is not evenly applied to the entire stator coil, there is a problem in that the areas not covered with oil cannot be expected to improve their dielectric strength. [Means for solving the problem]

[0005] In one embodiment, the motor cooling control device controls the electric oil pump output to increase and decrease in order to apply oil evenly to the coil ends, thereby changing the direction of the oil discharged from the upper hanging pipe. [Effects of the Invention]

[0006] According to the cooling control device of the present disclosure, the oil supply direction changes depending on whether the drive command value increases or decreases, thereby making it possible to suppress uneven oil application. [Brief explanation of the drawings]

[0007] [Figure 1]4 is a graph showing an example of control by the motor cooling control device according to the first embodiment. [Figure 2] 2 is a schematic diagram showing an example of cooling by the motor cooling control device according to the first embodiment. [Figure 3] 10 is a graph showing an example of control of a motor cooling control device according to another embodiment. [Figure 4] 10 is a flowchart illustrating an example of a control method for a motor cooling control device according to another embodiment. DETAILED DESCRIPTION OF THE INVENTION

[0008] Embodiment 1 Hereinafter, embodiments of the present invention will be described with reference to the drawings. Fig. 1 is a graph showing an example of control of a motor cooling control device according to the first embodiment. In Fig. 1, the vertical axis represents an output command D of an electric oil pump, and the horizontal axis represents time. This motor is a motor that drives the electric oil pump.

[0009] Specifically, the motor cooling control device issues an output command to the electric oil pump to increase and decrease the output command D of the electric oil pump during a predetermined time T as shown in Figure 1. This output command increases and decreases the amount of oil delivered within the predetermined time. 1. The output instruction is continuously varied within the range of preset output instruction values ​​Dmax to Dmin. 2. The output instruction is changed repeatedly at the set period T.

[0010] These instructions are implemented by a control unit that issues instructions to the electric oil pump. The control unit is configured, for example, by a computer or electronic circuit. The output instruction D is determined by the specifications of the electric oil pump and is, for example, a parameter such as the output duty ratio (%). The period T is set based on the control responsiveness of the electric oil pump, etc.

[0011] Next, cooling using oil will be explained. Figure 2 is a schematic diagram showing an example of cooling using a cooling control device for a motor according to the first embodiment. To apply oil to the motor stator coil, an overhead pipe with an oil hole is placed above the stator. The overhead pipe is a supply path that can supply oil to the coil end at an angle from the vertical direction above the mounting direction of the motor. Figure 2A is an image diagram of how cooling oil flows at Dmax. As shown in Figure 2A, Dmax is set so that the oil discharge pressure is high and oil 23 is sprayed from the overhead pipe 21 toward the outer periphery of the stator 22. 2B is an image diagram of the cooling oil flow at Dmin. As shown in FIG. 2B, Dmin is set so that the oil discharge pressure is low and oil 33 flows from the upper hanging pipe 31 to the inner diameter side of the stator 32.

[0012] As described above, the motor cooling control device of the first embodiment changes the oil supply direction in response to an increase or decrease in the drive command value, thereby preventing uneven oil application. In other words, the motor cooling control device of the first embodiment changes the oil flow continuously as the electric oil pump output command is changed, allowing oil to be applied evenly to the entire stator.

[0013] The present invention is not limited to the above-described embodiment, and various modifications can be made without departing from the spirit of the present invention. For example, the amount of oil applied to the stator coil may be taken into consideration, and a dwell time may be provided at the output command value Dmax or Dmin.

[0014] Fig. 3 is a graph showing an example of control of a motor cooling control device according to another embodiment. In Fig. 3, the vertical axis represents the output command D of the electric oil pump, and the horizontal axis represents time. As shown in Fig. 3, after the output command value increases to Dmax, the output command value Dmax may be maintained for a retention time Ta, and then the output command value may be decreased. Alternatively, after the output command value decreases to Dmin, the output command value may be maintained for a retention time Tb, and then the output command value may be increased.

[0015] Also, control may be performed to change the value of the period T in FIG.

[0016] Further, it may be possible to determine whether or not output fluctuation control of the electric oil pump is necessary based on the oil temperature. Fig. 4 is a flowchart showing an example of a control method for a motor cooling control device according to another embodiment.

[0017] First, in step S41, it is determined whether the oil temperature is lower than the fluctuation control start threshold. If the oil temperature is lower than the fluctuation control start threshold, the process proceeds to step S42. If the oil temperature is equal to or higher than the fluctuation control start threshold, the process proceeds to step S43.

[0018] In step S42, the output fluctuation control of the electric oil pump described in the first embodiment is carried out, and the process then ends.

[0019] In step S43, the output fluctuation control of the electric oil pump is not performed, and the process ends.

[0020] In particular, at low temperatures, the oil viscosity is high, making it difficult for the oil to splash, and it is thought that uneven oil application to the stator coil is likely to occur. Therefore, as shown in the flowchart of Figure 4, a configuration may be used to determine whether or not output fluctuation control of the electric oil pump is necessary based on the oil temperature. [Explanation of symbols]

[0021] 21, 31 Upper pipe 22, 32 Stator 23, 33 Oil

Claims

[Claim 1] a pipe having a supply path that is angled from the vertical direction and that is located above the mounting direction of the motor of the electric oil pump and that can supply oil to the coil end; an electric oil pump that delivers oil to the pipe; a control unit for increasing and decreasing the amount of oil delivered within a predetermined time; A motor cooling control device comprising:

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