Nidec Motor Corp. v. Zhongshan Broad Ocean Motor Co., 2016-1900

Decision Date14 March 2017
Docket Number2016-1900
Citation851 F.3d 1270
Parties NIDEC MOTOR CORPORATION, Appellant v. ZHONGSHAN BROAD OCEAN MOTOR CO. LTD, Broad Ocean Motor LLC, Broad Ocean Technologies LLC, Appellees
CourtU.S. Court of Appeals — Federal Circuit

Scott R. Brown , Hovey Williams LLP, Overland Park, KS, argued for appellant. Also represented by Matthew B. Walters .

Steven F. Meyer , Locke Lord LLP, New York, NY, argued for appellees. Also represented by Joseph Anthony Farco ; Charles Baker , Houston, TX.

Before Lourie, Moore, and Taranto, Circuit Judges.

Moore, Circuit Judge.

The present appeal arises from an inter partes review ("IPR") involving Zhongshan Broad Ocean Motor Co. Ltd., Broad Ocean Motor LLC, and Broad Ocean Technologies, LLC (collectively "Broad Ocean") and Nidec Motor Corp. ("Nidec"). Broad Ocean petitioned for IPR of claim 21 of Nidec's U.S. Patent No. 7,208,895 (the " '895 patent"). The Patent Trial and Appeal Board (the "Board") instituted the IPR and found that claim 21 was anticipated by U.S. Patent No. 5,569,995 ("Kusaka"). Nidec appeals that decision to our court. Because the Board's decision is not supported by substantial evidence, we reverse.

BACKGROUND

The '895 patent discloses a system for controlling the torque of an electromagnetic motor. Figure 1 illustrates its basic operation. Controller 110 receives various inputs, including torque demand and rotor position/speed. '895 patent at 2:24–30. The output of the controller is input into drive 108, which outputs three energizable phase windings 106A, 106B, and 106C to the motor. Id . at 2:16–22. Each winding wraps around the motor 101, which comprises stator 102 and rotor 104. Id . at 2:14–16.

Id . at Fig. 1.

Motor control values can be expressed relative to two different frames of reference: the stationary frame of reference and the rotating frame of reference. The stationary frame of reference calculates values relative to the position of the stator. For example, voltages 106A–C in Figure 1 are expressed in the stationary reference frame. Id . at 3:21–25. The rotating frame of reference calculates values relative to the position of the rotor. In the rotating frame of reference, the d-axis is aligned with the rotor, and the q-axis is offset by 90 degrees. A signal in the rotating frame of reference contains both q-axis and d-axis components.

Figure 2 provides a more detailed description of the operation of the controller. The dispute in this case centers on the vectorize block 212. The inputs to the vectorize block are reference currents IQr demand 208 and Idr demand 209. The IQr and Idr demand signals are "concatenated" in vectorize block 212 to produce IQdr demand signal 214. Id . at 3:3–13.

Id . at Fig. 2. Claim 12, from which challenged claim 21 depends, requires "combining the IQr demand and the dr-axis injection current [Idr] demand to produce an IQdr demand." Id . at 10:1–16. The Board construed (1) "IQr demand" as "Q-axis demand current;" (2) "dr-axis injection current demand" as "d-axis injection current;" and (3) "IQdr demand" as "a current demand that includes Q-and d-axis current demands." J.A. 14. Neither party challenges these constructions on appeal.

The Board found Kusaka anticipates claim 21 of the '895 patent. Kusaka is a patent assigned to Toyota that discloses the motor control system shown in Figure 1:

Current Control Section block 18 has three inputs: Id, Iq, and θ. Id and Iq are reference currents in the rotating frame of reference, and θ is the angular position of the rotor. The Control block has three outputs: phase reference currents Iu, Iv, and Iw. Broad Ocean concedes that Iu, Iv, and Iw are in the stationary frame of reference. Appellees' Br. 50–51.

The Board found that Kusaka's reference currents Iq and Id disclosed the "IQr demand" and "dr-axis injection current demand" limitations, respectively, and that "the set of Iu*, Iv*, and Iw* is an IQdr demand as we have construed the term." J.A. 19. Based on these disclosures, it found that Kusaka anticipated claim 21 of the '895 patent. Nidec appeals. We have jurisdiction pursuant to 28 U.S.C. § 1295(a)(4)(A).

ANALYSIS

Anticipation is a question of fact we review for substantial evidence. REG Synthetic Fuels, LLC v. Neste Oil Oyj , 841 F.3d 954, 958 (Fed. Cir. 2016). "[A] claim is anticipated if each and every limitation is found either expressly or inherently in a single prior art reference." King Pharm., Inc. v. Eon Labs, Inc. , 616 F.3d 1267, 1274 (Fed. Cir. 2010) (quotations omitted).

Nidec argues Kusaka does not anticipate because it does not disclose "produc[ing] an IQdr demand." It argues Kusaka discloses three separate phase currents in the stationary frame of reference, rather than an IQdr demand, which must be in the rotating frame of reference. Appellants' Br. 28–32.

Throughout the IPR proceedings, both Nidec and Broad Ocean took the position that the IQdr demand must be a signal in the rotating frame of reference. In its petition for IPR, Broad Ocean's expert testified that the letter "r" in "IQr" and "Idr" "further enforces the determination that the value is one in the rotating frame of reference." J.A. 118–19. In its Patent Owner's Response, Nidec argued on multiple occasions that the IQdr demand signal is in the rotating frame of reference. See J.A. 319, 321–22. And in its Petitioner's Reply, Broad Ocean noted that " 'IQdr' is a common term used in the art as a general reference for the quadrature current IQ and the direct current Id in the rotating frame of reference." J.A. 355.

The parties' understanding that an IQdr demand signal must be in the rotating frame of reference is consistent with the '895 patent's specification. After leaving the vectorize block, the IQdr demand signal is converted to a vector of motor voltages in the rotating frame of reference. This vector is then converted into three reference voltages in the stationary frame of reference, which are applied to the motor. '895 patent at 3:14–25. Given that the information in the IQdr demand signal is ultimately converted from the rotating frame of reference to the stationary frame of reference, the IQdr demand signal itself must be in the rotating frame of reference.

The Board's finding that Kusaka anticipates claim 21 is not supported by substantial evidence because Kusaka fails to disclose an IQdr demand. The Board identified Kusaka's set of reference currents Iu, Iv, and Iw as disclosing an IQdr demand, but those signals are not in the rotating frame of reference. As Broad Ocean concedes, Iu, Iv, and Iw are expressed in the stationary frame of reference. Appellees' Br. 50–51. Because Kusaka does not disclose a signal in the rotating frame of reference, it does not disclose an IQdr demand. The Board's contrary finding is unsupported.1

The Board held that anticipation can be found even when a prior art reference fails to disclose a...

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