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Motor control device

A control device and motor technology, applied in the direction of motor control, AC motor control, AC motor acceleration/deceleration control, etc., to achieve the effect of reducing power consumption

Active Publication Date: 2014-11-19
MITSUBISHI ELECTRIC CORP
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0018] Patent Document 1 only discloses the case where the shape of the speed curve is triangular. Therefore, there is a problem that sufficient energy saving cannot be achieved by changing the speed curve according to operating conditions.

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment approach 1

[0054] figure 1 It is a block diagram showing the configuration of a positioning system including the motor control device according to Embodiment 1 of the present invention. exist figure 1 In the positioning system, the motor control device includes a command value generation circuit 7, a motor drive circuit 4, and a regenerative resistor 6, and controls the motor 1 so that the mechanical load 3 connected to the motor 1 moves from the initial position (the first position) to the Target position (2nd position). figure 1 The positioning system also has a power supply 5 and an encoder 2.

[0055] The electric motor 1 operates with a current 22 supplied from the motor drive circuit 4 , and applies a driving force 21 such as torque or thrust to the mechanical load 3 . As the mechanical load 3, for example, a ball screw mechanism is assumed, but it is not limited thereto. The encoder 2 detects motor information 23 such as the rotational position (angle) and rotational speed of ...

Embodiment approach 2

[0125] In Embodiment 1, positioning control is performed based on a trapezoidal speed profile in order to reduce power consumption. However, in this embodiment, a different speed profile is used. Although the configuration of the positioning system including the motor control device according to the second embodiment is the same as that of the first embodiment ( figure 1 ) are the same, however, the position command value generation process performed by the command value generation circuit 7 is different from that of the first embodiment.

[0126] Figure 6 It is a flowchart showing position command value generation processing according to Embodiment 2 of the present invention. exist Figure 6 In the flow chart of , since steps S1-S4 are similar to Embodiment 1 ( figure 2 ) are the same, so the explanation is omitted. When step S4 is yes, go to step S11. In step S11, it is determined whether the moving time T is shorter than the shortest moving time T 0 of times small...

Embodiment approach 3

[0205] In Embodiments 1 and 2, the effect was described by quantitatively calculating the power consumption when performing positioning control and showing its reduction. In the present embodiment, effects will be described using a different method. Although the configuration of the positioning system including the motor control device according to the third embodiment is the same as that of the first embodiment ( figure 1 ) are the same, however, the position command value generation process performed by the command value generation circuit 7 is different from that of the first embodiment.

[0206] Figure 11 It is a flowchart showing position command value generation processing according to Embodiment 3 of the present invention. exist Figure 11 In the flow chart of , since steps S1-S4 are similar to Embodiment 1 ( figure 2 ) are the same, so the explanation is omitted. When it is determined as YES in step S4, go to step S21, and determine the acceleration curve A(t) i...

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PUM

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Abstract

A command value generating circuit (7) determines an acceleration profile (A(t)) representing temporal changes in acceleration of a mechanical load (3) in such a manner that: the mechanical load (3) accelerates from a standstill at a first position to a peak velocity (Vp), and decelerates from the peak velocity (Vp) and is brought to a standstill at a second position; the absolute value of the acceleration when the mechanical load (3) is accelerating and decelerating is less than or equal to a prescribed maximum acceleration (Amax); and the prescribed maximum acceleration (Amax) is maintained over a prescribed time from the start of acceleration of the mechanical load (3), and then gradually decreases from the maximum acceleration (Amax). The command value generating circuit (7) determines a velocity profile representing temporal changes in velocity of the mechanical load in accordance with the acceleration profile (A(t)), and generates a position command value (24) in accordance with the velocity profile.

Description

technical field [0001] The present invention relates to a motor control device for controlling the operation of various motors such as a servo motor. Background technique [0002] Due to the increasing awareness of energy conservation in recent years, there is a demand to reduce power consumption as much as possible when performing positioning control using electric motors such as servo motors in various industrial machines. [0003] Inventions of Patent Documents 1 to 5 are disclosed as methods for reducing power consumption during positioning control as described above. [0004] Patent Document 1 discloses a head positioning device whose purpose is to reduce power consumption according to a user's use and to efficiently perform positioning control regardless of temperature changes, aging, and the like. The speed profile storage unit stores in advance a target speed profile A corresponding to high speed seek and a target speed profile B with low seek speed but low power co...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H02P29/00
CPCH02P23/0063H02P23/20G05B6/02
Inventor 上田浩一郎
Owner MITSUBISHI ELECTRIC CORP
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