Kabushiki Kaisha Yaskawa Denki

Masaki Hisatsune

Shinya Morimoto

Yasuhiro Miyamoto

Mamoru Takaki

Takato Doi

Kazuhiro Maekawa

Kozo Ide

Masanobu Kakihara

Masahiko Tanabe

Aamir Noor Baloch

A rotary electric machine control apparatus includes: a phase estimator configured to estimate a first estimated phase value based on a rotary electric machine current; a correction value storage configured to store correction information representing a plurality of second estimated phase values and a plurality of correction values; a first phase corrector configured to acquire, based on a second estimated phase value corresponding to the first estimated phase value, from the correction information, a correction value associated with the second estimated phase value, and configured to correct the second estimated phase values based on the correction value; a position controller configured to calculate a speed command based on a position command and the corrected second estimated phase value; and a speed controller configured to calculate a torque command value and a q-axis current command value based on the speed command and the corrected second estimated phase value.

Rotary electric machine control apparatus and control method for rotary electric machine

This inverter device includes a power portion performing PWM control on a voltage command to a motor for each set time period, converting direct-current power into alternating-current power, and outputting the same, a voltage command generation portion generating a voltage command in synchronization with a period N-times (N&#x2267;1) longer than the time period, an interval determination portion generating an interval determination signal which is ON during a half period of the time period and OFF during the next half period, a current detection portion detecting the current of the motor at timing of change in the interval determination signal, and a voltage correction portion generating a voltage correction value such that the amount of change in the detected current when the interval determination signal is ON becomes equal to the amount of change in the detected current when it is OFF and correcting the voltage command.

Inverter device and control method thereof

A motor control device includes a current profile generator generating a current profile, a pilot voltage operator calculating a pilot pulse voltage, on the basis of the current profile, and adding the pilot pulse voltage to a voltage command on a d axis, a magnetic pole position detector detecting a position of a magnetic pole in the permanent magnet motor, on the basis of the pilot pulse voltage, a polarity identification evaluation current operator calculating a polarity identification evaluation current for identifying a polarity of the magnetic pole in the permanent magnet motor, on the basis of a current value on the d axis in the motor current that has been detected in synchronization with a period of PWM control, and a polarity detector outputting a phase correction amount, on the basis of a deviation between the polarity identification evaluation current and the current profile.

Motor control device

A moving-coil linear motor free of cogging. The motor has a rotor ( ) including separated block cores ( and ), each of which has a length equivalent to eight times the magnet pitch (Pm) and includes nine teeth ( ) along the length. The block cores are arranged in line and separated by gaps equivalent to &frac23; of the magnet pitch. The first block ( ) is divided into three groups of teeth ( ) with armature coils ( ) to form U-, V- and W-phases. Similarly, the second block ( ) is grouped to form V-, W- and U-phases, and the third block ( ) is grouped to form W-, U- and V-phases. The armature coils ( ) are formed to differ in phase by 120 degrees from one another in order to zero the sum of the cogging caused by the blocks.

Linear motor

The invention relates to a linear motor which is provided with a row of permanent magnets . . . for a field system, and an armature facing the same via a magnetized space in an orthogonal direction thereto, wherein the armature core has a winding accommodation groove formed at both sides of armature iron plates produced by punching out oriented electromagnetic steel plate so as to become rectangular, and convex and concave engagement portions and the armature iron plates are laminated to constitute one core block, and at the same time, the lengthwise direction, orthogonal to the permanent magnet row, in the respective core blocks is made the same as the rolling direction of electromagnetic steel plates. Thereby, since the magnetic flux of the armature winding flows along the rolling direction of the core blocks, the magnetic flux density can be increased, and the peak thrust can be also increased.

Growing community of inventors

Kitakyushu, Japan

Masaki Hisatsune