Title:
MOTOR CONTROLLER AND MOTOR SYSTEM
Document Type and Number:
Japanese Patent JP2019097341
Kind Code:
A
Abstract:
To reduce an axial error while suppressing a wasteful current before changeover into a position sensorless control mode in a motor control device for controlling a motor by vector control.SOLUTION: A motor controller performs changeover from a synchronous control mode to a position sensorless control mode during a sensorless changeover period. In the relevant period, the motor controller calculates a q-axis current "Iq0" based on an axial error "Δθ0" of a real axis (dq axis) and a control axis (γδ axis) at a start time of the relevant period and a γ axis target current "Iγo" to specify "Iq0×(1+Kg)" as a target value with a prescribed coefficient being "Kg" (Kg>0). Then, the motor controller repeats processing to acquire the axial error "Δθ0" and processing to increase a δ axis target current Iδso that while decreasing a y-axis target current Iγan addition value of its q axis component and a q-axis component of a δ-axis target current becomes equal to a target value until the axial error Δθ becomes equal to or smaller than a prescribed threshold value.SELECTED DRAWING: Figure 3
Inventors:
KIN KYOKEN
Application Number:
JP2017226270A
Publication Date:
June 20, 2019
Filing Date:
November 24, 2017
Export Citation:
Assignee:
RENESAS ELECTRONICS CORP
International Classes:
H02P21/24; H02P6/18
Attorney, Agent or Firm:
Tsutsui International Patent Office