Ngk Spark Plug Company, Limited

Denso Corporation

Nippon Soken, Inc.

Other

Asmo Co., Ltd.

Mie University

Hideji Yoshida

Shigeru Miyata

Yasuo Ito

Yoshihiro Matsubara

Yasuaki Aoki

Yoshiyuki Takabe

Shinji Makita

Yoshitaka Yamada

Naohisa Mimura

Takashi Suzuki

Keiichi Uno

Hironori Asa

Atsushi Inaba

Takashi Yamanaka

Hiroshi Ogawa

Akihiro Imura

Tomohiro Saitou

Shigeki Iwanami

Hiroshi Kishita

Koichi Ban

Yasuhiro Takeuchi

Masami Fujitsuna

Tetsuya Nagata

Tomohiro Nezuka

Haruyuki Urushihata

Akihiko Takenaka

Nobuhiro Hayakawa

Hiroshi Tamura

Atsushi Imai

Tomohiro Saito

Takayuki Inohara

Akimasa Niwa

Tessho Yamada

Hideji Tani

Akio Mizutani

Yuuta Nakamura

Takashi Yoshiya

Hiroshi Amano

Hiroko Yoneshima

Yosuke Matsuki

Muneaki Ishida

Tadanao Zanma

A drive circuit drives a switch configuring a power converter. The drive circuit divides an inter-terminal voltage of a switch. The drive circuit includes a differential circuit having first and second input terminals to which the divided inter-terminal voltages are inputted. The differential circuit outputs an analog voltage based on a voltage difference between the input terminals. The differential circuit executes reset of the output voltage, and with the voltage difference when reset is canceled after reset is executed as a reference voltage, outputs an analog voltage in which an amount of change from the reference voltage is multiplied by an amplification factor. The drive circuit outputs a binary signal based on comparison results between a threshold and the analog voltage outputted from the differential circuit, and sets a transfer rate of a gate charge of the switch when a driving state is switched, based on the output signal thereof.

Drive circuit for switch

In a current detection apparatus, an arm current detection unit detects each of at least first and second phase currents having respective amplitudes and flowing in a multiphase rotary electric machine based on a potential difference between input and output terminals of the corresponding one of first and second detection switches during the corresponding one of the first and second detection switches being on. A bus current detection unit detects each of at least bus-based first and second phase currents corresponding to the first and second phases of the multiphase rotary electric machine based on a current flowing through one of first and second buses. An amplitude correction unit corrects the first and second phase currents based on the bus-based first and second phase currents such that the amplitudes of the respective first and second phase currents match with each other.

Current detection apparatus and control apparatus of rotary electric machine

In a system, a superimposing element sets a command value vector of a high-frequency voltage signal and superimposes the high-frequency voltage signal with the command value vector on an output voltage of an inverter. The high-frequency voltage signal has a frequency higher than an electrical angular frequency of a rotary machine. The command value vector is correlated with a measured high-frequency component value of a current signal flowing in the rotary machine. A calculating element calculates a rotational angle of the rotary machine based on the measured high-frequency component value of the current signal flowing in the rotary machine. A reducing element controls at least one of the inverter and a direct voltage power supply to reduce a difference due to the dead time between the command value vector and a vector of a high-frequency voltage signal to be actually superimposed on the output voltage of the inverter.

Apparatus for calculating rotational position of rotary machine

In an apparatus, a predicting unit uses, as an initial value of a controlled variable, at least one of a first measured value of the controlled variable and a second measured value of a physical variable expressed as a function of the controlled variable. The predicting unit predicts, based on the initial value of the controlled variable, a value of the controlled variable when a driving mode of a switching element of a power converter is set. A driving unit has an integral element and determines, based on an output of the integral element to which a deviation between the predicted value of the controlled variable and a command value of the controlled variable is inputted, an actual driving mode of the switching element to thereby drive the switching element in the determined driving mode.

Apparatus for carrying out improved control of rotary machine

A control system aims at converting, via a switching circuit, a direct current voltage into an alternating current voltage to be applied to multiphase windings of a multiphase rotary machine to thereby control rotation of the multiphase rotary machine. In the control system, a command voltage determiner determines a command voltage value for an alternating current voltage to be applied to the multiphase windings based on a zero crossing of a line-to-line current and a zero crossing of the amount of change in the line-to-line current. A driving unit drives the switching circuit on and off based on the determined command voltage value to thereby modulate the direct current voltage to the alternating current voltage to be applied to the multiphase windings.

Control system for multiphase rotary machines

A complex fluid machine has an expansion-compressor device, a pump, and a motor generator, wherein the expansion-compressor device, the pump, and the motor generator are operatively connected and arranged in series, and a power transmitting device for disconnecting the pump from the motor generator, when the expansion-compressor device is driven by the motor generator so as to be operated as a compressor device.

Refrigerating apparatus and fluid machine therefor

A waste heat energy recovery system has a refrigerant cycle and a Rankine cycle. When the cycle operation is changed from the refrigerant cycle to the Rankine cycle, an expansion device is started after the pump is started. When the cycle operation is changed from the Rankine cycle to the refrigerant cycle, the expansion device is stopped after the pump is stopped.

System utilizing waste heat of internal combustion engine

An apparatus is provided for controlling a synchronous motor. The apparatus comprises a first calculator calculating a voltage characteristic showing a characteristic of voltages to be applied to armature coils of a stator and a producer producing a command signal to provide the armature coils with the phase currents on the basis of the voltage characteristic. The apparatus still comprises a current detector detecting a signal depending on an amplitude of at least one of the phase currents, a second calculator calculating a rate of changes in a current amount indicating amplitudes of the phase currents, by using the signal from the current detector, and a feed-back member feed-backing the rate of changes in the current amount into the calculation of the voltage characteristic.

Method and apparatus for controlling synchronous motor

The variable valve timing controller controls the valve timing of the intake valve. The variable valve timing controller has a shaft, the stator fixed on the engine and generating the magnetic field around the shaft and rotational phase converter converting the torque applied to the shaft. When the valve timing is in the most delayed timing, the engine can be started. The rotational phase of this timing is called the feasible phase. When the stator stops generating the magnetic field, the load torque arise on the shaft. The rotational phase converter varies the rotational phase into the feasible phase with receiving the load torque from the shaft.

Variable valve timing controller

A lower battery block feeds low-voltage power to a low-voltage load. The lower battery block includes cells. At least one higher battery block is connected in series with the lower battery block, and cooperates with the lower battery block to feed high-voltage power to a high-voltage load. The higher battery block includes cells. A DC&mdash;DC converter transmits power from the higher battery block to the lower battery block. A controller detects an electric parameter of the lower battery block which relates to an average per-cell voltage in the lower battery block, and also an electric parameter of the higher battery block which relates to an average per-cell voltage in the higher battery block. The controller operates for controlling the DC&mdash;DC converter in response to the detected electric parameters to equalize the average per-cell voltage in the lower battery block and the average per-cell voltage in the higher battery block.

Vehicular power supply apparatus and method of controlling the same

A reluctance-type motor include a stator having a plurality of salient stator-poles, a rotor having a plurality of salient rotor-poles, a multi-phase coils mounted in the stator, and a driver circuit for driving said multi-phase coil. The driver circuit starts to supply drive current to the multi-phase coils when the salient rotor-poles and the salient stator-poles come across each other. In other words, the drive current is supplied to the multi-phase coils when the inductance thereof is zero.

Reluctance-type electric motor

A reluctance-type motor comprises, for each of its rotor and stator, a core that has a cylindrical ring and a plurality of salient poles protruding from the ring in a radial direction of the ring. Each pole has a bottom width and a top width in a circumferential direction of the core at its bottom and at its top, respectively. The bottom width is sized to be larger than the top width, and the ring has a width sized to be larger than a half of the top width of the pole. The pole may be shaped to have a round corner at the bottom or in a trapezoid in which the bottom width is larger than the top width. The core may have a plurality of thin magnetic plates stacked in an axial direction of the core, each plate has a plurality slits in each protrusion which forms the pole, and each plate has a thickness which is less than 5 times of a maximum width of each slit.

Reluctance-type motor having widened bottom

In a q phase-reluctance type motor including a rotor having 2n rotor protrusions with an arc angle X&deg;, a stator having 2m stator protrusions with an arc angle Y&deg; and m pairs of exciting coils, each of the pairs of exciting coils is disposed around one of the stator protrusions spaced apart at 180&deg; in mechanical angle, and the following conditions are met: q&gE;5, X&deg;, Y&deg;>360&deg;/(n&times;q), X&deg;&plus;Y&deg;&equals;180&deg;/n&minus;&agr;&deg;, where &agr;&deg; is a counter torque marginal angle which is larger than 0&deg;.

Reluctance type motor

A reluctance type motor apparatus comprises switching devices for energizing phase coils of a motor, diodes for circulating discharge currents of the phase coils, a current sensor for detecting a sum of currents flowing in the phase coils, and a control circuit for controlling energization of the phase coils so that the detected sum of the currents equal a predetermined reference current. The current sensor is positioned between the phase coils and junctions between the phase coils and the diodes. Phase currents supplied to energize the phase coils are varied in dependence on the rotational position of the rotor so that the output torque of the motor does not include ripple.

Reluctance type motor apparatus and driving method capable of reducing ripples in motor output torque

Growing community of inventors

Hashima, Japan

Hideji Yoshida