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Denso : Researchers Submit Patent Application, "Rotating Electric Machine Integrated with Controller", for Approval (USPTO 20170317562)

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11/16/2017 | 06:11pm CET

By a News Reporter-Staff News Editor at Health & Medicine Week -- From Washington, D.C., NewsRx journalists report that a patent application by the inventors ASANO, Nobuhiro (Kariya-city, JP); MAWATARI, Yuki (Kariya-city, JP); KONDO, Koji (Kariya-city, JP); INAMURA, Hiroshi (Kariya-city, JP); YOSHIMURA, Masataka (Kariya-city, JP); SUZUKI, Yuki (Kariya-city, JP), filed on April 26, 2017, was made available online on November 9, 2017 (see also Denso Corporation).

The patent's assignee is Denso Corporation.

News editors obtained the following quote from the background information supplied by the inventors: "Technical Field

"The present disclosure relates to a rotating electric machine integrated with a controller.

"Related Art

"Conventionally, there are rotating electric machines integrated with control devices, each provided with a rotating electric machine and a control device.

"The rotating electric machine integrated with a controller is provided with a rotating electric machine and a control device (also referred to as an inverter assembly). The control device includes a power module, a heat sink, a connection terminal, a bus bar and an insulator. The power module is adhered to the heat sink by an adhesive agent which has thermal conductivity and electrical insulating properties. The connection terminal and bus bar provided with an inner wall section, an outer wall section, and a flat wall section, are inserted in an insulator forming a case member. The insulator is adhered to the sink heater by the adhesive agent. The power module is accommodated in a concave section formed by the insulator and the heat sink. A terminal of the power module is connected to the connection terminal and the bus bar. The concave section formed by the insulator and the heat sink is filled with a filler having electrical insulating properties. An example of a hitherto rotating electric machine integrated with a controller is disclosed in JP2014-45629A and JP2011-243909A.

"A rotating electric machine integrated with a controller, in JP2014-45629A, includes each one of two different power modules equipped with a same, switching element, for example, inside circuit, and an outer appearance that is substantially symmetrical. The two power modules as a pair are combined with a heat sink. In this configuration, since the two different power modules are combined with the heat sink thereon, a front end of at least one terminal of the two different power modules, exposed from the resin member to an outside thereof, is serially arranged to be projected at an equal distance to each other, that is from an surface end of both power modules. As a result, it is disclosed that miniaturization of the rotating electric machine is achieved, cooling properties and reliability can also be improved.

"JP2011-243909A discloses that, in a case of using a control apparatus of a semi-conductor device (power module) as a switching element of an upper and lower arm of an inverter of a rotating electric machine for a vehicle, a switching element is needed for each phase of the upper and lower arm accordingly. As a consequence, a number of wires and a number of signal terminals connected to a temperature detection element increase, and a number of signal terminals of a control device (control by IC) also increase. In relation to above mentioned problems, it is also disclosed that, by using a power module configured with an upper and lower arm switching element, and by connecting either the upper or the lower arm of a temperature detection terminal to the signal terminal, the number of control IC ports can be reduced and miniaturization of the control device achieved

"However, an integrated control device, disclosed in JP2014-45629A, employs a module which controls the upper and the lower arm using 2 switching elements, for the module of a rotating electric machine configured of two sets of three phase stator coils which is disclosed in JP2011-243909A. That is, JP2014-45629A, discloses a rotating electric machine which employs a total of 6 modules.

"In the integrated control device described above, it is necessary to monitor the temperature of the 6 power modules, in order to detect abnormalities in all phases of the stator coils. As a consequence, an increase in a number of ports of the control device (control IC), which temperature monitoring results (measured results) are transmitted to, may be problematic. Specifically, the increase in the number of ports results in a bulkier control apparatus (control IC), which in turn leads to a bulkier integrated control device as a result. In view of the foregoing, the present disclosure strives to provide a rotating electric machine integrated with a controller which can detect an abnormality of an operation that is of concern, for example, detection of an abnormal temperature of a stator coil, and achieve miniaturization thereof."

As a supplement to the background information on this patent application, NewsRx correspondents also obtained the inventors' summary information for this patent application: "In order to resolve the foregoing problems, the rotating electric machine integrated with a controller according to a first aspect of the disclosure, is provided with a rotating electric machine which has a stator and a rotor and a power converter provided with a control board and a plurality of power modules. The stator has two sets of three phase stator coils, and the control board is equipped with electronical components configuring a control circuit of the rotating electric machine. The plurality of power modules are provided with a plurality of switching elements and at least one of the modules is provided with switching elements which controls two different sets of stator coils and a detection element which detects a state of the module.

"In the configuration, at least one of the modules controls two different sets of stator coils. An abnormality in the two sets of stator coils (for example, an abnormally increased temperature) can be detected, by detecting the state (for example, a temperature) of at least one of the modules using the detection element. That is, the abnormality of two sets of stator coils can be detected by detecting the state of the at least one module thus a number of detection elements required for an entire rotating electric machine can be decreased. Furthermore, a number of ports of the control apparatus (IC control) which receive a detection result transmitted from the detector element can also be decreased, which in turn decreases a size of the rotating electric machine.

"The rotating electric machine integrated with a controller in a second aspect of the disclosure is provided with the power converter having a first module which controls the two different sets of the stator coils and second modules which controls the same set of the stator coils. According to the configuration, if an abnormality occurs in either one of the two sets of stator coils, the stator coil in which the abnormality has occurred can be detected from detected results of the first module and second module.

"The rotating electric machine integrated with a controller in a third aspect of the disclosure, is provided with the first module having a temperature detection element as the detection element, which detects a temperature of the first module. In the configuration the state of the first module can be detected using the temperature.

"The rotating electric machine integrated with a controller, in a fourth aspect of the disclosure, is provided with the second modules having the temperature detection elements as the detection elements, which detect a temperature of the second modules. In the configuration a state of the second modules can be detected.

"The rotating electric machine integrated with a controller in a fifth aspect of the disclosure, has each of the modules provided with a heat sink thermally insulated from a different module among the modules. In the configuration, a transmission of heat to each module through the heat sink disposed between adjacent modules is suppressed. As a result, a decrease in the precision of detected results of transmitted heat detected is also suppressed.

"The rotating electric machine integrated with a control device, in a sixth aspect of the disclosure, is provided with the control board having an open circular shape. Each of the modules are disposed around a circumferential direction (CIRC) of the open circular shape and the at least one of the modules is disposed diametrically opposite to a section being an open section of the circle. In the configuration, the at least one of the modules is not in a close vicinity of the open section of the circular shape. As a result, heat dissipation from the at least one of the modules is suppressible, even if heat dissipation occurs at the open section. As a result, a decrease in the detection precision of the detection element is suppressed. It is noted that, a position diametrically opposite the open section of the open circle is the position which is diametrically opposite in a circumferential direction thereof, with reference to a center point of the circular shape of the control board.

"Additionally, in the configuration described, modules other than the at least one module are disposed between the at least one module and the open section of the open circular shape. In this case, modules other than the at least one module can dissipate heat at the open section of the open circular shape. As a result, an effect of heat transmitting from other adjacent modules to the at least one modules is suppressed.

"The rotating electric machine integrated with a controller in a seventh aspect of the disclosure, is provided with the control board having the open circular shape which has an open section, each of the modules disposed is around a circumferential direction (CIRC) of the open circular shape, and the first module is disposed diametrically opposite to the open section of the circular shape.

"In this configuration, since the first module is disposed diametrically opposite to the open section of the open circular shape, heat dissipation of the first module from the open section of the circular shape is suppressed. Specifically, the distance between the first module detecting a state (abnormalities) of the stator coil, and the open section of the circular shape is long, thus heat dissipates with difficulty from the open section of the circular shape, when the first module generates heat. The distance herein refers to a distance through which heat is transmitted through the control board.

"Additionally, since the second module is disposed between the open section of the circular shape and the first module, transmission of the heat is blocked by the second modules disposed therebetween, even if the heat is transmitted towards the open section of the circular shape, when the first module dissipates heat. As a result, a decrease in the detection precision which detect a state (abnormalities) of the first module is suppressed.

"The rotating electric machine integrated with a controller in an eight aspect of the disclosure, is provided with the control board having the open section of the circle formation, and connection members connecting the switching elements which control the stator coils, to an outside connection member provided on the open section of the circular shape. In the configuration, connection members may also be used for heat dissipation at the open section of the circular shape. The connection members have good heat dissipating properties. When a module generates heat, the heat transmission occurs through the connection member of the module. As a result, a heat dissipation capacity at the open section of the circular shape can be increased and the effect of heat from the adjacent modules to the normally operating module is thus suppressed. Additionally, suppression of a decrease of the detection precision of the detection element is also achieved.

"The rotating electric machine integrated with a controller in a ninth aspect of the disclosure, is provided with the power converter having the connection member and heat sink connected to the external connection member integrated into resin case. The control board and module are encapsulated in the resin case by potting resin. In this configuration, potting resin decreases an effect of the peripheral temperature to the temperature detection element of the module. Additionally, if a foreign body exists in the power converter (control apparatus), the filler member suppresses contact or collision of the foreign body with other components therein. As a result, a decrease in the detection precision of the detection element is also suppressed."

For additional information on this patent application, see: ASANO, Nobuhiro; MAWATARI, Yuki; KONDO, Koji; INAMURA, Hiroshi; YOSHIMURA, Masataka; SUZUKI, Yuki. Rotating Electric Machine Integrated with Controller. Filed April 26, 2017 and posted November 9, 2017. Patent URL: http://appft.uspto.gov/netacgi/nph-Parser?Sect1=PTO1&Sect2=HITOFF&d=PG01&p=1&u=%2Fnetahtml%2FPTO%2Fsrchnum.html&r=1&f=G&l=50&s1=%2220170317562%22.PGNR.&OS=DN/20170317562&RS=DN/20170317562

Keywords for this news article include: Microtechnology, Denso Corporation.

Our reports deliver fact-based news of research and discoveries from around the world. Copyright 2017, NewsRx LLC

(c) 2017 NewsRx LLC, source Health Newsletters

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Financials ( JPY)
Sales 2018 4 906 B
EBIT 2018 -
Net income 2018 296 B
Finance 2018 549 B
Yield 2018 1,95%
P/E ratio 2018 16,94
P/E ratio 2019 15,93
EV / Sales 2018 0,93x
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