Nidec Servo Inactive USPTO patentsUtility grant

Utility

Motor drive device

3 Oct 23

A motor drive device includes a first drive circuit to control an energization period of a first upper arm switch and a first lower arm switch connected to one end of a coil, a second drive circuit to control an energization period of a second upper arm switch and a second lower arm switch connected to another end of the coil, a current detection circuit to detect current flowing through the coil and output a current detection signal indicating a detection result of the current, a first protection circuit to determine whether overcurrent has occurred based on the current detection signal and output a first enable signal indicating a determination result to the first drive circuit, and a second protection circuit to determine whether overcurrent has occurred based on the current detection signal and output a second enable signal indicating a determination result to the second drive circuit.

Koji Mizukami, Junya Kaneko, Katsuaki Kimura

Filed: 10 Feb 21

Utility

Motor

8 Nov 22

A motor case has a first case portion and a second case portion coupled to the first case portion.

Toru Kobayashi, Yoshifumi Kuwano

Filed: 26 Sep 19

Utility

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1 Nov 22

A motor assembly includes an output shaft disposed along a central axis extending in one direction, a motor that rotates the output shaft, a circuit board electrically connected to the motor, a power supply that supplies power to the motor and the circuit board, and a case having a tubular shape that extends in an axial direction and accommodates the motor, the circuit board, and the power supply.

Shinya Kasai

Filed: 17 Jan 18

Utility

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6 Sep 22

A motor includes a sheet-metal cover accommodating a stator and a substrate and a wiring assembly electrically connected to the substrate.

Ryotaro Takahashi, Koji Mizukami

Filed: 18 Sep 18

Utility

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30 Aug 22

A motor includes a shaft extending along a center axis, and a first groove that is recessed in a radial direction and extends in an axial direction, on an outer side surface of the shaft.

Toshihiro Okabe, Mariko Tanaka, Satoshi Taguchi, Hironobu Yoshikawa

Filed: 2 Jan 20

Utility

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21 Jun 22

A motor includes a rotor rotatable about a central axis, and a stator opposing the rotor in a radial direction.

Norihisa Imaizumi, Tsuyoshi Nakagawa

Filed: 20 Sep 19

Utility

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8 Feb 22

A motor includes binding pins around which a coil lead wire is wound, and an end on one side in an axial direction of the binding pin and the coil lead wire are fixed to a surface facing one side in the axial direction of a substrate.

Ryotaro Takahashi, Koji Mizukami

Filed: 18 Sep 18

Utility

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16 Nov 21

A motor includes a rotor rotatable about a central axis, and a stator opposing the rotor in a radial direction.

Norihisa Imaizumi, Tsuyoshi Nakagawa

Filed: 20 Sep 19

Utility

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9 Nov 21

A motor includes a cover including a first cup body and a second cup body, each including a bottomed tubular shape.

Ryotaro Takahashi, Koji Mizukami

Filed: 18 Sep 18

Utility

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5 Oct 21

A control apparatus includes a controller that controls a motor, a first transmission channel connected to a first power-supply terminal of an alternating-current source that supplies an alternating-current voltage, a second transmission channel connected to a second power-supply terminal of the alternating-current source, and a third transmission channel connected to each of the first transmission channel and the second transmission channel.

Keiichi Abe, Koji Harada, Huafei Cai, Masashi Nagumo, Takayuki Suematsu

Filed: 8 Nov 19

Utility

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21 Sep 21

A motor includes a cover with first and second cup bodies.

Ryotaro Takahashi, Koji Mizukami

Filed: 18 Sep 18

Utility

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14 Sep 21

A signal conversion device includes a first signal input terminal, a second signal input terminal, and a detector.

Charles Simson Halason Silitonga

Filed: 13 Mar 20

Utility

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23 Feb 21

A motor unit includes a motor, a controller that outputs a pulse signal, a driver that supplies a drive current to the motor based on the pulse signal, and a detector that determines an actual rotation number of the motor.

Charles Simson Halason Silitonga

Filed: 12 Feb 19

Utility

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26 Jan 21

A motor includes a rotor including a shaft extending along a central axis, a stator radially facing the rotor, a circuit board electrically connected to a coil of the stator, and a motor case.

Runxiang Mao, Makoto Yajima

Filed: 19 Feb 19

Utility

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23 Nov 20

A motor drive circuit includes an upper switch, a lower switch connected in series with the upper switch and drives a brushless DC motor, a gate drive circuit that drives the lower switch and a brake circuit that uses an inductive voltage generated by the brushless DC motor to apply a voltage to a gate terminal of the lower switch via the gate drive circuit and turns on the lower switch.

Masatomo Ishikawa, Masahiro Tsuchiya

Filed: 7 Aug 17

Utility

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16 Nov 20

A counter-rotating axial flow fan includes a first fan including a first impeller including first blades radially arranged around a predetermined central axis, a first motor rotating the first impeller around the central axis, and a first case surrounding an outer periphery of the first impeller, and a second fan including a second impeller including second blades radially arranged around the central axis, a second motor rotating the second impeller around the central axis, and a second case surrounding an outer periphery of the second impeller.

Yoshihiko Kato, Takahiro Bamba, Yoshihisa Kagawa, Takanori Abe

Filed: 14 Mar 19

Utility

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7 Sep 20

An icemaker includes an ice-making tray in which ice is produced, an ice-discharging mechanism that removes the ice from the ice-making tray, a driver that drives the ice-discharging mechanism and that is attached to the ice-making tray on a front side in a front-rear direction, and a lighting unit that emits light.

Eiji Kuroda, Kenji Sugaya, Hironobu Yoshikawa, Hideaki Ito

Filed: 5 Jun 17

Utility

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20 Apr 20

A fan apparatus has a drive circuit for an electrically-driven rotor, and includes a drive signal generating circuit portion for the electrically-driven rotor; an output stage including an upper MOSFET and a lower MOSFET; and a motor portion to be driven by the output stage.

Motoi Otsuka

Filed: 23 Aug 16

Utility

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14 Oct 19

A motor drive apparatus for driving a motor includes a rectifier, a capacitor, an inverter circuit, a control portion arranged to output a drive signal, and a sensing portion arranged to sense a smoothed direct-current voltage, and output an analog sensing result to the control portion.

Masatomo Ishikawa

Filed: 27 Jun 18