Power control device for motor

Abstract

To provide a technique for providing a noise filter that is effective for six output terminals of a power control device to the power control device having two inverters.SOLUTION: A power control device includes: a first inverter; a first terminal group including a first terminal, a second terminal, and a third terminal electrically connected to the first inverter; a second inverter; a second terminal group including a fourth terminal, a fifth terminal, and a sixth terminal electrically connected to the second inverter; an annular core formed using a magnetic material and surrounding the first terminal group and the second terminal group; and a relay magnetic body formed using a magnetic material and interposed between the first terminal group and the second terminal group in the inside of the annular core. The three terminals of the first terminal group are disposed close to each other on one side of the relay magnetic body. The three terminals of the second terminal group are disposed close to each other on the other side of the relay magnetic body.SELECTED DRAWING: Figure 1

Description

Technical Field

[0001] The technology disclosed in this specification relates to a power control device for a motor.

Background Art

[0002] Patent Document 1 describes a power control device for a motor. This power control device incorporates an inverter and has two input terminals connected to a battery. Noise filters are provided at the two input terminals. The noise filter is composed of an annular core surrounding the two input terminals and a relay magnetic body disposed between the two input terminals.

Prior Art Documents

Patent Documents

[0003]

Patent Document 1

Summary of the Invention

Problems to be Solved by the Invention

[0004] A power control device for a motor may include two three-phase AC inverters. In that case, the power control device will have six output terminals corresponding to the two three-phase AC inverters. Even if a conventional noise filter is provided collectively for these six output terminals, it may be difficult to obtain a sufficient noise suppression effect depending on the arrangement of these output terminals. Alternatively, it is also conceivable to provide a noise filter for each set of three-phase terminals. However, providing multiple noise filters independently may pose new problems in terms of space and cost. This specification provides a technique for providing an effective noise filter for the six output terminals in a power control device including two inverters.

Means for Solving the Problems

[0005] The technology disclosed in this specification is embodied in a power control device for a motor. In a first aspect of this technology, the power control device includes a first inverter, a first terminal group that is electrically connected to the first inverter and includes a first terminal, a second terminal, and a third terminal that output AC power of different phases respectively, a second inverter, a second terminal group that is electrically connected to the second inverter and includes a fourth terminal, a fifth terminal, and a sixth terminal that output AC power of different phases respectively, an annular core formed using a magnetic material and surrounding the periphery of the first terminal group and the second terminal group, and a relay magnetic body formed using a magnetic material and interposed between the first terminal group and the second terminal group inside the annular core. The first terminal, the second terminal, and the third terminal of the first terminal group may be arranged close to each other on one side of the relay magnetic body. The fourth terminal, the fifth terminal, and the sixth terminal of the second terminal group may be arranged close to each other on the other side of the relay magnetic body.

[0006] In the above-described power control device, a noise filter for six terminals is simply configured by an annular core and a relay magnetic body disposed inside it. The annular core surrounds the six terminals collectively, and the inside of the annular core is divided into two regions by the relay magnetic body. On one side of the relay magnetic body, the first terminal group for the first inverter is arranged close to each other. And on the other side of the relay magnetic body, the second terminal group for the second inverter is arranged close to each other. According to such a configuration, although it is a relatively simple configuration, in each of the first terminal group and the second terminal group, for example, common-mode noise can be effectively suppressed.

[0007] In a second aspect of this technology, in addition to the above first aspect, both ends of the relay magnetic body may be connected to the inner surface of the annular core. According to such a configuration, the noise reduction effect for the six terminals can be further enhanced. However, as another embodiment, one end or both ends of the relay magnetic body may not be connected to the inner surface of the annular core.

[0008] In a third aspect of the present technology, in addition to the above-described first aspect or second aspect, the first terminal, the second terminal, and the third terminal of the first terminal group and the fourth terminal, the fifth terminal, and the sixth terminal of the second terminal group may be arranged in a straight line.

[0009] In a fourth aspect of the present technology, in addition to the above-described third aspect, the first terminal, the second terminal, and the third terminal of the first terminal group may be arranged at a first interval from each other. And the fourth terminal, the fifth terminal, and the sixth terminal of the second terminal group may be arranged at a second interval from each other. In this case, the first terminal group and the second terminal group may be located at a third interval greater than the first interval and the second interval from each other. Here, the first interval and the second interval may be equal to each other or different from each other.

[0010] In a fifth aspect of the present technology, in addition to any one of the above-described first aspect to fourth aspect, the motor may have a first-phase coil, a second-phase coil, and a third-phase coil. In addition, the first terminal may be connected to one end of the first-phase coil, the second terminal may be connected to one end of the second-phase coil, and the third terminal may be connected to one end of the third-phase coil. In addition, the fourth terminal may be connected to the other end of the first-phase coil, the fifth terminal may be connected to the other end of the second-phase coil, and the sixth terminal may be connected to the other end of the third-phase coil. According to such a configuration, the power control device can be adopted in a dual-inverter type circuit in which two independent inverters are respectively connected to a single motor.

Brief Description of the Drawings

[0011]

Figure 1

Figure 2

Figure 3

Embodiments for Carrying Out the Invention

Example

[0012] Referring to FIGS. 1 and 2, the power control device 10 of the embodiment will be described. As shown in FIG. 2, the power control device 10 of the present embodiment is a power control device for the motor 50, and controls the power of the battery 2 supplied to the motor 50. The battery 2 has one or more secondary battery cells and is configured to be chargeable and dischargeable. The secondary battery cell is not particularly limited, and may be, for example, a lithium ion battery cell or an all-solid-state battery cell.

[0013] As shown in FIGS. 1 and 2, the power control device 10 includes a first inverter 20, a second inverter 30, a first terminal group 22, and a second terminal group 32. Each of the first inverter 20 and the second inverter 30 is connected to the motor 50. The motor 50 is, for example, a driving motor of an electric vehicle. The motor 50 drives at least one wheel of the electric vehicle. As shown in FIG. 2, the motor 50 is a three-phase motor and has a U-phase coil 52, a V-phase coil 54, and a W-phase coil 56. Here, the U-phase coil 52, the V-phase coil 54, and the W-phase coil 56 are each an example of the "first phase coil", "second phase coil", and "third phase coil" of the present technology.

[0014] The first inverter 20 is disposed between the battery 2 and the motor 50. The first inverter 20 is a three-phase AC inverter. The first inverter 20 has a plurality of switching elements. A freewheeling diode is connected in parallel to each switching element. The second inverter 30 is a three-phase AC inverter and can be configured in the same manner as the first inverter 20.

[0015] The first terminal group 22 includes a first terminal 24, a second terminal 26, and a third terminal 28. The first terminal 24, the second terminal 26, and the third terminal 28 are each a long bus bar electrically connected to the first inverter 20. The first terminal 24, the second terminal 26, and the third terminal 28 each output AC power of different phases. Specifically, the first terminal 24 is connected to one end 52a of the U-phase coil 52 of the motor 50. The second terminal 26 is connected to one end 54a of the V-phase coil 54 of the motor 50. The third terminal 28 is connected to one end 56a of the W-phase coil 56 of the motor 50.

[0016] The second terminal group 32 includes a fourth terminal 34, a fifth terminal 36, and a sixth terminal 38. The fourth terminal 34, the fifth terminal 36, and the sixth terminal 38 are each a long bus bar electrically connected to the second inverter 30. The fourth terminal 34, the fifth terminal 36, and the sixth terminal 38 each output AC power of different phases. Specifically, the fourth terminal 34 is connected to the other end 52b of the U-phase coil 52 of the motor 50. The fifth terminal 36 is connected to the other end 54b of the V-phase coil 54 of the motor 50. The sixth terminal 38 is connected to the other end 56b of the W-phase coil 56 of the motor 50.

[0017] As described above, the power control device 10 of this embodiment can be adopted in a dual-inverter circuit in which two independent inverters 20 and 30 are respectively connected to a single motor 50. A circuit of this type is described, for example, in U.S. Patent Application Publication No. 2022 / 0173687 and U.S. Patent Application Publication No. 2022 / 0416711. Therefore, a detailed description of the circuit will be omitted.

[0018] As shown in FIG. 1, the power control device 10 includes an annular core 40 and a relay magnetic body 42. The annular core 40 is made of a magnetic material. The magnetic material constituting the annular core 40 includes a ferromagnetic material such as iron, for example. The annular core 40 is generally a flat cylindrical member and surrounds the periphery of the first terminal group 22 and the second terminal group 32. The annular core 40 is disposed in at least a part of the section in the direction in which the first terminal group 22 and the second terminal group 32 extend.

[0019] The relay magnetic body 42 is made of a magnetic material. The magnetic material constituting the relay magnetic body 42 includes a ferromagnetic material such as iron, for example. The relay magnetic body 42 is generally a plate-like member and is interposed between the first terminal group 22 and the second terminal group 32 inside the annular core 40. The relay magnetic body 42 extends intersecting with respect to the direction in which the first terminal group 22 and the second terminal group 32 are arranged between its both ends 42a and 42b.

[0020] Inside the annular core 40, the first terminal 24, the second terminal 26, and the third terminal 28 of the first terminal group 22 are arranged close to each other on one side (the left side in FIG. 1) of the relay magnetic body 42. Inside the annular core 40, the fourth terminal 34, the fifth terminal 36, and the sixth terminal 38 of the second terminal group 32 are arranged close to each other on the other side (the right side in FIG. 1) of the relay magnetic body 42.

[0021] Specifically, the first terminal 24, the second terminal 26, and the third terminal 28 of the first terminal group 22 and the fourth terminal 34, the fifth terminal 36, and the sixth terminal 38 of the second terminal group 32 are arranged in a straight line. The first terminal 24, the second terminal 26, and the third terminal 28 of the first terminal group 22 are arranged at a first interval D1 apart from each other. The fourth terminal 34, the fifth terminal 36, and the sixth terminal 38 of the second terminal group 32 are arranged at a second interval D2 apart from each other. The first terminal group 22 and the second terminal group 32 are located at a third interval D3 apart from each other. The third interval D3 is larger than the first interval D1 and the second interval D2. Although not particularly limited, the first interval D1 and the second interval D2 are equal to each other. In a modified example, the first interval D1 and the second interval D2 may be different from each other.

[0022] As described above, the power control device 10 of this embodiment has six output terminals 24, 26, 28, 34, 36, and 38 corresponding to the two three-phase AC inverters 20 and 30. In the power control device 10, noise filters for these six terminals 24, 26, 28, 34, 36, and 38 are simply configured by the annular core 40 and the relay magnetic body 42 disposed inside thereof. The annular core 40 collectively surrounds the six terminals 24, 26, 28, 34, 36, and 38, and the inside of the annular core 40 is divided into two regions by the relay magnetic body 42. On one side of the relay magnetic body 42, the first terminal group 22 for the first inverter 20 is disposed in proximity to each other. And on the other side of the relay magnetic body 42, the second terminal group 32 for the second inverter 30 is disposed in proximity to each other. According to such a configuration, although it is a relatively simple configuration, in each of the first terminal group 22 and the second terminal group 32, for example, common mode noise can be effectively suppressed.

[0023] Both ends 42a and 42b of the relay magnetic body 42 in this embodiment are not connected to the inner surface 40a of the annular core 40. Without being limited to this configuration, as shown in FIG. 3, in the power control device 100 of the modified example, both ends 142a and 142b of the relay magnetic body 142 may be connected to the inner surface 40a of the annular core 40. According to such a configuration, the noise reduction effect for the six terminals 24, 26, 28, 34, 36, and 38 can be further enhanced. In another modified example, one of both ends of the relay magnetic body 142 may be connected to the inner surface 40a of the annular core 40, and the other of both ends of the relay magnetic body 142 may not be connected to the inner surface 40a of the annular core 40.

[0024] Note that, although not particularly limited, the annular core 40 may be integrally formed as one part as a whole, or may be formed by combining two parts (for example, semi-circular parts) divided in the circumferential direction of the annular core 40.

Description of Reference Numerals

[0025] 10, 100: Power control device, 20: First inverter, 22: First terminal group, 24: First terminal, 26: Second terminal, 28: Third terminal, 30: Second inverter, 32: Second terminal group, 34: Fourth terminal, 36: Fifth terminal, 38: Sixth terminal, 40: Annular core, 40a: Inner surface, 42, 142: Relay magnetic body, ends: 42a, 42b, 142a, 142b, D1: First interval, D2: Second interval, D3: Third interval

Claims

1. A power control device for a motor, comprising: a first inverter; a first terminal group electrically connected to the first inverter and including a first terminal, a second terminal, and a third terminal that output AC power of different phases respectively; a second inverter; a second terminal group electrically connected to the second inverter and including a fourth terminal, a fifth terminal, and a sixth terminal that output AC power of different phases respectively; an annular core made of a magnetic material and surrounding the first terminal group and the second terminal group; a relay magnetic body made of a magnetic material and interposed between the first terminal group and the second terminal group inside the annular core; and comprising: the first terminal, the second terminal, and the third terminal of the first terminal group are arranged close to each other on one side of the relay magnetic body; the fourth terminal, the fifth terminal, and the sixth terminal of the second terminal group are arranged close to each other on the other side of the relay magnetic body; a power control device.

2. The power control device according to claim 1, wherein both ends of the relay magnetic body are connected to the inner surface of the annular core.

3. The power control device according to claim 2, wherein the first terminal, the second terminal, and the third terminal of the first terminal group and the fourth terminal, the fifth terminal, and the sixth terminal of the second terminal group are arranged in a straight line.

4. The first terminal, the second terminal, and the third terminal of the first terminal group are arranged apart from each other at a first interval; the fourth terminal, the fifth terminal, and the sixth terminal of the second terminal group are arranged apart from each other at a second interval; the first terminal group and the second terminal group are located apart from each other at a third interval greater than the first interval and the second interval. The power control device according to claim 3.

5. The motor has a first-phase coil, a second-phase coil, and a third-phase coil; the first terminal is connected to one end of the first-phase coil, the second terminal is connected to one end of the second-phase coil, the third terminal is connected to one end of the third-phase coil; the fourth terminal is connected to the other end of the first-phase coil, the fifth terminal is connected to the other end of the second-phase coil, and the sixth terminal is connected to the other end of the third-phase coil. The power control device according to any one of claims 1 to 4.

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