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Motor control device, motor control method, and sewing machine

A control device and control method technology, applied in the field of sewing machines and motor control devices, can solve the problems of motor power factor reduction, high cost, and effective current increase, and achieve the effect of improving power factor

Inactive Publication Date: 2016-10-12
JUKI CORP
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0005] In the motor control described in Patent Documents 1 and 2, if a high-performance motor is used, speed changes due to load fluctuations can be suppressed, but there is a problem of high cost
On the other hand, there is a limit to the responsiveness of low-performance and cheap motors, and speed changes cannot be suppressed even if the voltage and current are increased
In this case, although the desired output cannot be obtained, in order to control the motor, the voltage and current are increased so that an additional current flows through the motor
Therefore, there are problems that the effective current increases, the power factor of the motor decreases, and the extra current affects the heat generation of the motor.

Method used

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  • Motor control device, motor control method, and sewing machine
  • Motor control device, motor control method, and sewing machine
  • Motor control device, motor control method, and sewing machine

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Embodiment Construction

[0042] Next, the motor drive device according to the present embodiment will be described with reference to the drawings. figure 1 It is a block diagram of the motor drive unit. In addition, the motor drive device according to this embodiment is not limited to figure 1 The shown structure can be changed suitably. Next, the motor control device for the sewing machine will be described, but the detailed structure of the sewing machine will be omitted.

[0043] like figure 1 As shown, the motor driving device has: a rectifier 2, which converts the AC from the main power supply 1 of three-phase AC or single-phase AC into DC; an inverter bridge circuit 4, which converts the DC from the rectifier 2 into AC and output to a servo motor (motor) 3 ; and a motor control device 5 that performs PWM control on the inverter bridge circuit 4 . A smoothing capacitor 6 for smoothing the output (DC voltage) of the rectifier 2 is connected in parallel to the rectifier 2 . The main power supp...

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PUM

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Abstract

Corrected excess current that is helpless for the speed change is inhibited to reduce the effective current of a motor. A motor control device drives and controls a servo motor (3), which can generate speed change due to periodic load fluctuation. The motor control device comprises a speed detection section (12) which detects a current speed of the motor; a speed deviation calculator (13) which generates an instruction current based on the current speed of the servo motor; and a filter circuit (14), which eliminates the changing component, which triggers the load change, of the instruction current. The provided motor control device drives and controls the servo motor through the instruction current without the changing component.

Description

technical field [0001] The present invention relates to a motor control device, a motor control method, and a sewing machine for driving and controlling a motor connected to a main shaft of a sewing machine. Background technique [0002] In the load device, since various loads are connected to the output end of the motor, the speed changes due to periodic load fluctuations during one revolution of the motor. Conventionally, there is known a method of detecting a speed change of a motor of a load device and performing correction on motor control to reduce the speed change (for example, refer to Patent Documents 1 and 2). In the motor control of Patent Document 1, a speed change due to a load is monitored, and a command value for the motor is corrected, thereby suppressing the speed change of the motor. In the motor control described in Patent Document 2, the output current to the motor is corrected in accordance with the periodic load state to control the rotational speed, t...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H02P6/10H02P6/06
Inventor 丸山刚志伊久美启
Owner JUKI CORP
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