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US 6,674,262 B2Granted
Motor control apparatus and motor control method
AssigneeNissan Motor Co., Ltd.
InventorsYasuhiko Kitajima, Masahiro Tsukamoto, Kouichirou Yonekura, Kantaro Yoshimoto
Life of this patent
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Abstract
A motor control apparatus comprises a fundamental current command value determining device that determines a fundamental current command value for a motor current based upon at least a torque command value for an AC motor, a higher harmonics current command value determining device that determines a higher harmonics current command value for the motor current and a current control device that controls the current flowing to the AC motor based upon the fundamental current command value and the higher harmonics current command value.
Claims22
A motor control apparatus comprising:
- a fundamental current command value determining device that determines a fundamental current command value for a motor current;
- a higher harmonics current command value determining device that determines a higher harmonics current command value for the motor current;
- and
- a current control device that controls a current flowing to the AC motor based upon the fundamental current command value and the higher harmonics current command value, wherein
- said fundamental current command value determining device sets the fundamental current command value based upon at least a torque command value for an AC motor,
- said higher harmonics current command value determining device sets the higher harmonics current command value based upon at least a torque command value of the AC motor, and
- said current control device includes a fundamental wave current control device that implements control so as to match a fundamental wave component of the motor current with the fundamental current command value in a dq coordinate system that rotates in synchronization with a fundamental wave component of an armature flux linkage and a higher harmonics current control device that implements control so as to match a higher harmonics order component of the motor current with the higher harmonics current command value in a dhqh coordinate system that rotates in synchronization with a higher harmonics order component of the armature flux linkage.
4 more elements
A motor control apparatus comprising:
- a fundamental current command value determining device that determines a fundamental current command value for a motor current;
- a higher harmonics current command value determining device that determines a higher harmonics current command value for the motor current;
- and
- a current control device that controls a current flowing to the AC motor based upon the fundamental current command value and the higher harmonics current command value, wherein
- said fundamental current command value determining device sets the fundamental current command value based upon at least a torque command value for an AC motor,
- said higher harmonics current command value determining device sets the higher harmonics current command value based upon at least a torque command value of the AC motor, and
- said fundamental current command value determining device and said higher harmonics current command value determining device determine a fundamental current command value and a higher harmonics current command value respectively that maximize efficiency while matching a motor torque to the torque command value, a fundamental current command value and a higher harmonics current command value that minimizes torque ripple while matching a motor torque to the torque command value, a fundamental current command value and a higher harmonics current command value that minimize voltage ripple while matching a motor torque to the torque command value and a fundamental current command value and a higher harmonics current command value that minimizes current ripple while matching a motor torque to the torque command value;
- and
- said motor control apparatus further includes:
- an operating state detection device that detects a motor operating state;
- and
- a current command value selection device that selects optimal current command values corresponding to a motor operating state among fundamental current command values and higher harmonics current command values determined by said fundamental current command value determining device and said higher harmonics current command value determining device respectively.
9 more elements
A motor control apparatus comprising:
- a fundamental current command value determining device that determines a fundamental current command value for a motor current;
- a higher harmonics current command value determining device that determines a higher harmonics current command value for the motor current;
- and
- a current control device that controls a current flowing to the AC motor based upon the fundamental current command value and the higher harmonics current command value, wherein
- said current control device includes a fundamental wave current control device that implements control so as to match a fundamental wave component of a motor current with the fundamental current command value in a dq coordinate system that rotates in synchronization with a fundamental wave component of an armature flux linkage and a higher harmonics current control device that implements control so as to match a higher harmonics order component of the motor current with the higher harmonics current command value in a dhqh coordinate system that rotates in synchronization with a higher harmonics order component of the armature flux linkage;
- said higher harmonics order component is a higher harmonics component of a specific order manifesting when the motor current is controlled in said dq coordinate system alone;
- and
- said higher harmonics current command value determining device sets a higher harmonics current command value corresponding to the specific order in a higher harmonics component contained in the motor current to 0.
5 more elements
A motor control apparatus comprising:
- a fundamental current command value determining device that determines a fundamental current command value for a motor current;
- a higher harmonics current command value determining device that determines a higher harmonics current command value for the motor current;
- and
- a current control device that controls a current flowing to the AC motor based upon the fundamental current command value and the higher harmonics current command value, wherein
- said current control device includes a fundamental wave current control device that implements control so as to match a fundamental wave component of a motor current with said fundamental current command value in a dq coordinate system that rotates in synchronization with a fundamental wave component of an armature flux linkage and a higher harmonics current control device that implements control so as to match a higher harmonics order component of the motor current with the higher harmonics current command value in a dhqh coordinate system that rotates in synchronization with a higher harmonics order component of the armature flux linkage;
- and
- said higher harmonics current control device converts the motor current to a current in said dq coordinate system, detects a higher harmonics component of the current in said dq coordinate system resulting from the conversion and converts the higher harmonics component to a higher harmonics current in said dhqh coordinate system.
4 more elements
A motor control apparatus comprising:
- a fundamental current command value determining device that determines a fundamental current command value for a motor current;
- a higher harmonics current command value determining device that determines a higher harmonics current command value for the motor current;
- and
- a current control device that controls a current flowing to the AC motor based upon the fundamental current command value and the higher harmonics current command value, wherein
- said current control device includes a fundamental wave current control device that implements control so as to match a fundamental wave component of a motor current with the fundamental current command value in a dq coordinate system that rotates in synchronization with a fundamental wave component of an armature flux linkage and a higher harmonics current control device that implements control so as to match a higher harmonics order component of the motor current with the higher harmonics current command value in a dhqh coordinate system that rotates in synchronization with a higher harmonics order component of the armature flux linkage;
- and
- said higher harmonics current control device detects a higher harmonics component of the motor current and converts the higher harmonics component to a higher harmonics current in said dhqh coordinate system.
4 more elements
A motor control apparatus comprising:
- a fundamental current command value determining device that determines a fundamental current command value for a motor current;
- a higher harmonics current command value determining device that determines a higher harmonics current command value for the motor current;
- and
- a current control device that controls a current flowing to the AC motor based upon the fundamental current command value and the higher harmonics current command value, wherein
- said current control device includes a fundamental wave current control device that implements control so as to match a fundamental wave component of a motor current with the fundamental current command value in a dq coordinate system that rotates in synchronization with a fundamental wave component of an armature flux linkage and a higher harmonics current control device that implements control so as to match a higher harmonics order component of the motor current with the higher harmonics current command value in a dhqh coordinate system that rotates in synchronization with a higher harmonics order component of the armature flux linkage;
- and
- said higher harmonics current control device converts the motor current to a current in an αβ orthogonal coordinate system fixed to a stator of the motor, detects a higher harmonics component of the current in said αβ coordinate system and converts the detected higher harmonics component to a higher harmonics current in said dhqh coordinate system.
4 more elements
Dependencies are inferred from the claim text.