Mitsubishi Electric Corporation

Nippon Closures Co., Ltd.

Yuji Takayama

Koichi Arisawa

Takashi Yamakawa

Kazunori Hatakeyama

Keisuke Uemura

Yosuke Shinomoto

Haruka Matsuo

Shigeo Umehara

Makoto Tanikawa

Tomomi Higashikawa

Takuya Shimomugi

Kazuchika Tsuchida

Toru Sahara

Yuichi Shimizu

Tomoyuki Kamiyama

Masami Yorita

Takanobu Kondo

Takuya Furuyama

A motor drive device includes a single-phase inverter that converts a direct-current voltage into an alternating-current voltage applied to a motor. The motor drive device includes a control power supply outputting power having a voltage lower than the direct-current voltage. The motor drive device includes a drive signal generation unit driven by the power. The drive signal generation unit generates drive signals driving switching elements of the inverter. The motor drive device includes a power supply switch operating so as to allow supply of the power from the control power supply to the drive signal generation unit when a rotation speed of the motor is higher than a threshold. The power supply switch operates so as to stop the supply of the power from the control power supply to the drive signal generation unit when the rotation speed is lower than the threshold.

Motor drive device, electric blower, electric vacuum cleaner, and hand dryer

An electric blower includes a fan, a motor to drive the fan, a first board including at least one switching element, and a second board including a microcomputer. The motor, first board, and second board are arranged in this order in a blowing direction of the fan.

Electric blower, vacuum cleaner, and hand dryer

A motor drive device includes a single-phase inverter converting a direct-current voltage output from a power supply that is a direct-current power supply into an alternating-current voltage having a high level, low level, or zero level potential. The inverter outputs the alternating-current voltage as a motor applied voltage to be applied to a motor. The alternating-current voltage is a voltage that has a high level, low level, or zero level potential. When a rotation speed of the motor is to be reduced, a section in which a potential of the motor applied voltage is zero level is widened.

An electric motor includes a stator including four split cores, and a rotor having four magnetic poles. Each of the split cores includes a yoke and a tooth. An angle &#x3b8;1 [degree] formed by a side surface of the tooth and a side surface of the yoke on an inner side in a radial direction of the stator satisfies 90 degrees &#x2264;&#x3b8;1&#x3c;180 degrees.

Electric motor with stator

A motor driving apparatus for driving a single-phase motor includes an inverter disposed between a battery and the single-phase motor, the inverter applying a first voltage to the single-phase motor at startup and applying a second voltage to the single-phase motor during a normal operation. A stop time period is present after application of the first voltage, application of the first voltage being stopped during the stop time period, and the inverter applies the second voltage after a lapse of the stop time period.

Motor driving apparatus, electric blower, vacuum cleaner, and hand dryer

An outdoor unit includes at least one heat exchanger, a first motor including a first fan, a second motor including a second fan, an inverter that applies voltage to the first motor and the second for respectively, a connection switching unit that switches the voltage applied to the second motor between on and off, and a control unit that controls the inverter and the connection switching unit. The inverter is disposed closer to the first motor than to the second motor.

Outdoor unit for a refrigeration cycle apparatus and refrigerating cycle device

A motor drive device includes a single-phase inverter that converts a direct-current voltage output from a power supply which is a battery, into an alternating-current voltage. The inverter outputs the alternating-current voltage as an applied voltage to be applied to a motor. The applied voltage is lower when the direct-current voltage is a second voltage lower than a first voltage than when the direct-current voltage is the first voltage. Consequently, a discharge current of the battery is reduced, and the motor drive device capable of reducing an increase in battery temperature can be obtained.

To provide a hinged cap is capable of preventing liquid content from squirting out and minimizing adhesion of the content on the top face of the cap or around an outer circumferential abutment part, with a simple structure. A hinged cap () includes a cap body () and an upper lid () connected by a hinge (), with a tubular spout wall () provided on an upper surface side of the cap body (), and a circular suspended part () provided on an upper lid top face (). The circular suspended part () has an outer circumferential abutment part () that makes contact with an inner circumferential surface of the tubular spout wall (). The hinged cap includes a liquid build-up prevention part () at least in a lower part of the circular suspended part () opposite to a part connected to the hinge.

Hinged cap

An electric motor includes a stator including four split cores, and a rotor having four magnetic poles. Each of the split cores includes a yoke and a tooth. An angle &#x3b8;[degree] formed by a side surface of the tooth and a side surface of the yoke on an inner side in a radial direction of the stator satisfies 90 degrees&#x2264;&#x3b8;&#x3c;180 degrees.

Electric motor

A reliable electric vacuum cleaner is provided. An electric vacuum cleaner includes a housing, an electric blower, a battery, and a controller. The housing includes a first chamber, a second chamber, and a handle. The battery is held in the second chamber and supplies electric power for driving the electric blower. The controller controls the electric blower. A first distance from the handle to the battery is shorter than a second distance from the handle to the electric blower.

Electric vacuum cleaner and hand dryer

A motor driving apparatus drives an electric blower including a single-phase PM motor. The motor driving apparatus includes: a single-phase inverter that applies an alternating-current voltage to the single-phase PM motor; a rotor position detecting unit that outputs, to an inverter control unit, a position detecting signal corresponding to a rotational position of a rotor of the single-phase PM motor; a motor current detecting unit that outputs, to the inverter control unit, a signal corresponding to a motor current flowing to the single-phase PM motor; and the inverter control unit that outputs a driving signal to corresponding switching elements of the single-phase inverter on the basis of the position detecting signal and the motor current. The single-phase inverter performs control to increase or decrease effective electric power supplied to the single-phase PM motor. The air blower changes an air volume by the increase or decrease in effective electric power.

Motor driving apparatus, vacuum cleaner, and hand dryer

A motor control device includes a position sensor that detects a position of a motor, an AD converter that converts an analog signal, which is a detection value of a motor current, into a digital signal, and a control circuit that drives an inverter using an output signal of the AD converter. The control circuit starts the AD converter during a permission period, and performs processing for the analog-digital converter during an electrical half cycle including a permission period. The length of a prohibition period obtained by excluding a permission period from an electrical half cycle decreases as the rotating speed of the motor increases.

Motor control device, vacuum cleaner, and hand drier

A leak-current detecting unit detects a zero-phase current flowing from an electric-motor driving device, which drives an electric motor with electric power from an alternating-current power supply, or the electric motor to a ground, a leak-current control unit that, on the basis of the zero-phase current detected by the leak-current detecting unit, generates a control signal having cyclicity synchronized with the alternating-current power supply, and an anti-phase generating unit that generates an anti-phase current that is in anti-phase to the zero-phase current on the basis of the control signal from the leak-current control unit, and outputs the anti-phase current.

Power conversion device and compressor driving device

A power converting device includes: a rectifying circuit connected to an alternating-current power supply for converting alternating-current power from the alternating-current power supply into direct-current power; a short-circuit unit constituted by a diode bridge and a short-circuit element connected to opposite output ends of the diode bridge for short-circuiting the alternating-current power supply via a reactor; and a control unit that generates plural drive signals to control the short-circuit unit during a half cycle of the alternating-current power supply. The control unit generates a sine-wave-shaped current control range that is a target control range of power supply current of the alternating-current power supply, and maintains values of the power supply current of the alternating-current power supply within the current control range.

Power converting device that uses a sine-wave-shaped current control range to output drive signal

A power conversion device includes a rectifier circuit that converts an AC power from an AC power supply, into a DC power, a short-circuit unit that short-circuits the AC power supply via a reactor connected between the AC power supply and the rectifier circuit, a control unit that generates a plurality of drive signals to control the short-circuit unit in a half cycle of the AC power supply, and a smoothing capacitor. The control unit stepwise varies threshold values that limit a value of a power-supply current of the AC power supply, in an on-section or an off-section of the plurality of drive signals.

Growing community of inventors

Tokyo, Japan

Yuji Takayama