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US 7,679,308 B2Granted
Motor control device
AssigneeSanyo Electric Co., Ltd.
InventorYoshio Tomigashi
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AssigneeSanyo Electric Co., Ltd.
InventorYoshio Tomigashi
Estimating the term…
Let the rotating axis whose direction coincides with the direction of the current vector that achieves maximum torque control be called the qm-axis, and the rotating axis perpendicular to the qm-axis be called the dm-axis. A motor control device switches its operation between low-speed sensorless control and high-speed sensorless control according to the rotation speed of the rotor. In low-speed sensorless control, the magnetic salient pole of the motor is exploited, and the d-q axes are estimated by, for example, injection of a high-frequency rotating voltage. In high-speed sensorless control, the dm-qm axes are estimated based on, for example, the induction voltage produced by the rotation of the rotor. During high-speed sensorless control, the γ(dm)-axis current is kept at zero irrespective of the δ(qm)-axis current.
A motor control device comprising:
Dependencies are inferred from the claim text.
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From the US filing history. Foreign family members aren’t listed.
Arrangements or methods for the control of electric machines by vector control, e.g. by control of field orientation: estimation or adaptation of…
Arrangements or methods for the control of electric machines by vector control, e.g. by control of field orientation: vector control not involving…
Indexing scheme relating to controlling arrangements characterised by the means for detecting the position of the rotor: determination of the…
Indexing scheme relating to controlling arrangements characterised by the means for detecting the position of the rotor: determination or…
About 1 year 5 months of term left · ends 21 Mar 2028 (estimated)
This nonprovisional application claims priority under 35 U.S.C. §119(a) on Patent Application No. 2006-177989 filed in Japan on Jun. 28, 2006, the entire contents of which are hereby incorporated by reference.
1. Field of the Invention
The present invention relates to a motor control device for controlling the operation of a motor. The present invention also relates to a motor drive system incorporating such a motor control device.
FIG. 1 is a block diagram showing an outline of the configuration of a motor drive system according to a first embodiment of the invention;
FIG. 2 is an analysis model diagram of the motor in the first embodiment of the invention;
FIG. 3 is a configuration block diagram of the motor drive system shown in FIG. 1;
Hereinafter, embodiments of the present invention will be described specifically with reference to the accompanying drawings. Among these drawings, such parts as appear more than once are identified with common reference designations.
The switching among different control methods—the feature with which one of the main objects of the invention is achieved—will be dealt with in the second and following embodiments. To begin with, for easy understanding of the description of the second and following embodiments, a first embodiment of the invention will be described as a technology that the second embodiment presupposes.
FIG. 1 is a block configuration diagram of a motor drive system according to a first embodiment of the invention. The reference numeral 1 represents a three-phase permanent-magnet synchronous motor 1 (hereinafter referred to simply as “the motor 1”) that has a permanent magnet on a rotor (unillustrated) and that has an armature winding on a stator (unillustrated). The motor 1 is a salient-pole motor (a motor having a salient pole) as exemplified by an interior permanent magnet synchronous motor.