JP2013038324A - Reactor support structure - Google Patents

Abstract

A reactor support structure having excellent heat dissipation and excellent NV characteristics is provided.
A reactor having a coil wound around a core body is supported on a casing by a potting member formed of a latent heat storage material having a melting point of 150 ° C. or lower to constitute a reactor device. By using this reactor device for the boost converter, even if the coil 24 generates heat by driving the boost converter, it is possible to effectively absorb heat by the melting heat of the latent heat storage material. Further, when the potting member 28 is liquefied by melting, the vibration from the reactor is attenuated so as not to be transmitted to the casing 26 (vehicle body), so that the NV characteristics can be improved.
[Selection] Figure 1

Description

  The present invention relates to a reactor support structure that supports a reactor in which a coil is wound around a core in a case.

  Conventionally, as this type of reactor support structure, a structure in which a reactor in which a coil is wound around a core body is accommodated in a case (housing) has been proposed (for example, see Patent Document 1). In this reactor support structure, a coil (bobbin coil) wound in advance and integrated with a bobbin is adhered to the bottom surface of the case, and a resin material such as epoxy resin is injected therein to form a potting material. Here, a bobbin having a thermal conductivity larger than that of the potting material is used, and thereby heat dissipation can be improved. Further, by using a resin material having a low vibration transmissibility as a potting material, it is said that vibration transmitted from the core body to the case can be attenuated and NV (Noise and Vibration) characteristics can be improved.

JP 2010-272584 A

  In the reactor support structure described above, a bobbin having a high thermal conductivity is directly bonded to the bottom surface of the case. Therefore, although the heat generated by the coil can be efficiently radiated, the bobbin is supported by the potting material formed of a resin material. Therefore, vibration transmitted from the core body to the case may not be sufficiently damped with the vibration transmissibility of the resin material.

  The reactor support structure of the present invention is mainly intended to provide a reactor support structure having excellent heat dissipation and excellent NV characteristics.

  The reactor support structure of the present invention employs the following means in order to achieve the main object described above.

The reactor support structure of the present invention is
In the reactor support structure that supports the reactor in which the coil is wound around the core to the case,
The gist is to support the reactor on the case via a latent heat storage material whose melting point is set within the operating temperature range of the reactor.

  In the reactor support structure of the present invention, since the latent heat storage material has a characteristic of absorbing heat when the phase changes from solid to liquid, when the temperature of the reactor reaches the melting point of the latent heat storage material, the latent heat storage material With the phase change, the heat generation of the reactor can be absorbed, and the temperature rise of the reactor can be suppressed. Further, when the latent heat storage material is liquefied, the transmission of noise from the core and the coil can be blocked by the liquefied latent heat storage material, so that generation of vibration and noise can be suppressed.

It is a block diagram which shows the outline of a structure of the reactor apparatus 20 using the reactor support structure which is one Example of this invention. 1 is a configuration diagram illustrating an outline of a configuration of a motor drive circuit 10 including a reactor device 20. It is explanatory drawing which shows transition of the reactor temperature at the time of acceleration / deceleration driving | running | working of a vehicle. It is explanatory drawing explaining the mode of noise propagation when a latent heat storage material is liquefied.

  Next, the form for implementing this invention is demonstrated using an Example.

  FIG. 1 is a configuration diagram showing an outline of the configuration of a reactor device 20 using a reactor support structure as an embodiment of the present invention, and FIG. 2 is an outline of the configuration of a motor drive circuit 10 including the reactor device 20. FIG.

  The reactor device 20 is incorporated in, for example, a motor drive circuit 10 that drives a traveling motor 12 mounted on an electric vehicle. As shown in FIG. 2, the motor drive circuit 10 is connected to a motor 12 driven by three-phase alternating current, an inverter 14 driving the motor 12, a high-voltage power line 15 to which the inverter 14 is connected, and a battery 16. And a boost converter 18 that is connected to the low-voltage power line 17 and boosts the voltage of the low-voltage power line 17 and supplies the boosted voltage to the high-voltage power line 15.

  As shown in FIG. 2, the inverter 14 includes six transistors T1 to T6 and six diodes D1 to D6 connected in parallel to the transistors T1 to T6 in the reverse direction. Two transistors T1 to T6 are arranged in pairs so as to be on the source side and the sink side with respect to the positive and negative buses of the power line 15 on the high voltage side, respectively. Each of the three-phase coils (U phase, V phase, W phase) of the motor 12 is connected to each. Therefore, a rotating magnetic field can be formed in the three-phase coil by controlling the ratio of the on-time of the transistors T1 to T6 that make a pair in a state where a voltage is acting between the positive electrode bus and the negative electrode bus of the power line 15, The motor 12 can be rotationally driven.

  As shown in FIG. 2, the boost converter 18 is configured as a booster circuit including two transistors T7 and T8, two diodes D7 and D8 connected in parallel in the opposite direction to the transistors T7 and T8, and a reactor device 20. Has been. The two transistors T7 and T8 are respectively connected to the positive electrode bus of the high-voltage side power line 15 and the negative electrode bus of the high-voltage side power line 15 and the low-voltage side power line 17, and at the connection point of the reactor device 20 A coil 24 is connected. Further, the positive electrode terminal and the negative electrode terminal of the battery 16 are connected to the coil 24 of the reactor device 20 and the negative electrode bus of the low-voltage power line 17, respectively. Therefore, by turning on and off the transistors T7 and T8, the power of the low-voltage side power line 17 is boosted and supplied to the high-voltage side power line 15, or the power of the high-voltage side power line 15 is stepped down. Can be supplied to the power line 17.

  As shown in the figure, the reactor device 20 includes a casing 26 as a case made of a metal such as aluminum, a core body 22 formed by laminating silicon steel plates, for example, and wound around the core body 22. A coil 24, a bobbin 25 provided to insulate between the core body 22 and the coil 24, and a potting member 28 that supports the core body 22 and the coil 24 (reactor) in the housing 26. The housing 26 is fixed to the vehicle body by being attached to the vehicle body.

  The casing 26 is a box that can accommodate the core body 22 and the coil 24, and the inside is covered and sealed with a lid (not shown) in a state where the reactor is accommodated. Further, although not shown, a cooling pipe circulation line for cooling the core body 22 and the coil 24 by heat exchange with the circulating cooling water is provided at the bottom of the casing 26.

  The coil 24 is connected to the positive terminal of the battery 16 and the connection point of the transistors T7 and T8, and functions as a reactor for the boost converter 18.

  For the potting member 28, a latent heat storage material (phase change heat storage material) is used. The latent heat storage material is in a fixed state when the temperature is lower than the melting point, and when the temperature reaches the melting point, the phase changes from a solid state to a liquid state. At this time, the coil 24 is cooled as the latent heat storage material absorbs heat from the surroundings. In this embodiment, a material having a melting point lower than the upper limit temperature of the operating temperature range of the reactor device 20 (for example, 150 ° C. or less) is adopted as the latent heat storage material. FIG. 3 shows changes in the reactor temperature during vehicle acceleration / deceleration running. The reactor temperature (the temperature of the coil 24) rises greatly during acceleration / deceleration running in which a relatively large current flows through the coil 24. However, the reactor temperature is absorbed when the phase reaches the melting point of the latent heat storage material. It turns out that it can suppress effectively. FIG. 4 shows the noise propagation when the latent heat storage material is liquefied. The step-up converter 18 vibrates the core body 22 and the coil 24 by an alternating magnetic field accompanying switching of the transistors T7 and T8. When the potting member 28 is in a solid state, the vibration of the core body 22 and the coil 24 propagates to the vehicle body via the potting member 28 (see FIG. 4A), causing the occupant to feel vibration and noise. On the other hand, when the potting member 28 is liquefied by the heat of the coil 24, the vibration of the core body 22 and the coil 24 is attenuated by the liquefied potting member 28 (see FIG. 4B), so that the passenger feels vibration and noise. You can avoid it.

  According to the reactor device 20 using the reactor support structure of the embodiment described above, the reactor in which the coil 24 is wound around the core body 22 is supported by the casing 26 by the potting member 28 formed of a latent heat storage material. Therefore, even if the coil 24 generates heat by driving the boost converter 18 (on / off driving of the transistors T7 and T8), the heat can be effectively absorbed by the heat of fusion of the latent heat storage material. In addition, when the potting member 28 is liquefied by melting, the vibration from the reactor is attenuated so as not to be transmitted to the casing 26, so that the NV characteristics can be improved.

  In the embodiment, the present invention is applied to a reactor of a boost converter mounted on an electric vehicle, but is not limited to this, and is applied to a reactor of a converter mounted on a hybrid vehicle including an engine and a motor. It is good. Moreover, you may apply as a reactor with which drive apparatuses other than a vehicle are provided.

  The correspondence between the main elements of the embodiment and the main elements of the invention described in the column of means for solving the problems will be described. In the embodiment, the core body 22 corresponds to a “core”, the coil 24 corresponds to a “coil”, and the housing 26 corresponds to a “case”. The correspondence between the main elements of the embodiment and the main elements of the invention described in the column of means for solving the problem is the same as that of the embodiment described in the column of means for solving the problem. Therefore, the elements of the invention described in the column of means for solving the problems are not limited. That is, the interpretation of the invention described in the column of means for solving the problems should be made based on the description of the column, and the examples are those of the invention described in the column of means for solving the problems. It is only a specific example.

  As mentioned above, although the form for implementing this invention was demonstrated using the Example, this invention is not limited at all to such an Example, In the range which does not deviate from the summary of this invention, it is with various forms. Of course, it can be implemented.

  The present invention can be used in the manufacturing industry of reactor devices.

  DESCRIPTION OF SYMBOLS 10 Motor drive circuit, 12 Motor, 14 Inverter, 15 High voltage side power line, 16 Battery, 17 Low voltage side power line, 18 Boost converter, 20 Reactor device, 22 Core body, 24 Coil, 25 Bobbin, 26 Case, 28 Potting members, T1-T6, T7, T8 transistors, D1-D6, D7, D8 diodes.

Claims (1)

In the reactor support structure that supports the reactor in which the coil is wound around the core to the case,
A reactor support structure, wherein the reactor is supported by the case via a latent heat storage material whose melting point is set within the operating temperature range of the reactor.