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Motor control circuit for sewing machine

A technology of motor control and sewing machine, which is applied in the direction of control device for sewing machine, sewing machine components, excitation or armature current control, etc., can solve the problems of high and low motor back electromotive voltage, and large torque of sewing machine, and achieve stable quantitative speed control. Effect

Inactive Publication Date: 2006-10-18
AISIN SEIKI KK
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

On the other hand, at low temperatures, the torque of the sewing machine becomes large, and the counter electromotive voltage of the motor is also high
Then, by reducing the control of the number of revolutions of the motor, a phenomenon that stabilizes the number of revolutions of the motor occurs

Method used

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  • Motor control circuit for sewing machine
  • Motor control circuit for sewing machine
  • Motor control circuit for sewing machine

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Experimental program
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Effect test

Embodiment Construction

[0019] A first embodiment of the present invention will be described with reference to the drawings.

[0020] figure 1 is a schematic view for showing the structure of a motor control circuit for a sewing machine. figure 2 It is a circuit diagram showing the structure of a motor control circuit for a sewing machine. Figure 3A , 3B, 3C and 3D are waveform diagrams of corresponding circuit signals for the motor control circuit of the sewing machine. Figure 4 It is a graph showing the characteristics of the motor actual speed detected by the back electromotive force detection circuit and the back electromotive voltage signal of the motor. Figure 5 It is a view for explaining the output of a position sensor used in a motor control circuit for a sewing machine.

[0021] Such as figure 1 with figure 2 As shown, the power supply circuit 1 includes a commercial power supply 11 and its rectifier circuit 10 . The commercial power supply 11 supplies power to the motor 3 consti...

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PUM

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Abstract

A motor control circuit for a sewing machine including a speed command circuit (9) for instructing a target speed of a motor (3), a power supply circuit (1), a drive circuit (4), a counter electromotive force detection circuit (2) for detecting a counter electromotive voltage of the motor and calculating an actual speed of the motor, and a mechanical pulse generator (8) for detecting a rotation of a sewing needle characterized in that the motor control circuit further comprises a correction circuit (51) for calculating a speed correction value for the target speed on the basis of a comparison between the target speed and the sewing machine speed, and a comparison process circuit (52) for feed-backing a pulse width to the drive circuit, the pulse width being obtained by adding the speed correction value to a result of a subtraction of the actual speed from the target speed.

Description

technical field [0001] The present invention relates generally to motor control circuits for sewing machines. More specifically, the present invention relates to a motor control circuit for controlling the rotational speed of a motor of a sewing machine. Background technique [0002] A known motor control circuit for a sewing machine is disclosed in JP1996-150279A and JP2004-321771A. According to the disclosed motor control circuit for sewing machine, the speed of the motor is detected by measuring the pulse width and the number of pulses using a photo interrupter and an encoder disk (100 pulses / revolution) mounted on the motor . In addition, the motor control circuit for a sewing machine disclosed in JP2000-354395A points out the basic concept of obtaining the motor speed from the voltage value by the counter electromotive force of the motor. Furthermore, each of JP1994-32742B2, JP1995-16553B3, and JP1995-16554B2 includes calculating means for calculating the pulley rati...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): D05B69/00D05B69/18H02P7/00H02P7/06H02P7/29
CPCD05B69/12H02P6/18H02P7/29
Inventor 寺西俊一安藤孝树
Owner AISIN SEIKI KK