Stepping motor control circuit and analog electronic watch
A technology of stepping motors and control circuits, which is applied in the direction of motor generator control, electromechanical clocks, clocks, etc., can solve the problems of peak voltage deviation and time increase, peak generation time lag, load deviation, etc., and achieve low power consumption. consumption, realize the power consumption, and the effect of accurate timing action
Inactive Publication Date: 2010-10-27
SEIKO INSTR INC
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Problems solved by technology
[0005] However, the peak generation time of the induction signal based on the free vibration of the rotor has such a tendency: if the driving energy is greater than the load, the peak generation time is earlier, and if the driving energy is smaller than the load, the peak generation time is delayed
In addition, there is a problem that the deviation of the peak voltage increases proportionally to the elapse of time due to the influence of the load fluctuation of the gear train.
In addition, there is a problem that it is difficult to perform stable drive pulse control according to the time when the peak value of the induction signal is generated due to the load variation of each movement.
Method used
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[0023] Next, a motor control circuit and an analog electronic timepiece according to an embodiment of the present invention will be described using the drawings. In addition, in each figure, the same code|symbol is attached|subjected to the same part.
[0024] figure 1 It is a block diagram of an analog electronic timepiece using a stepping motor control circuit according to an embodiment of the present invention, showing an example of an analog electronic wristwatch.
[0025] First, the outline of the present embodiment will be described. From the first section T1a immediately after the driving of the main drive pulse P1, the section T for detecting the rotation of the stepping motor is sequentially divided into the second section T1b, the third section T2, and the second section T1b. Four sections of the fourth section T3.
[0026] In the normal load state, the first interval T1a is an interval in which the forward rotation of the rotor is detected in the third quadrant of...
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A stepping motor control circuit includes a rotation detecting means for detecting an induced signal generated by rotation of a rotor of a stepping motor, and detecting a rotation state of the stepping motor according to whether the induced signal exceeds a predetermined reference threshold voltage in a predetermined detection section, and a control means for controlling driving of the stepping motor by using any one of a plurality of main driving pulses having energy different from each other or a correction driving pulse having energy higher than energy of each main driving pulse according to a detection result of the rotation detecting means, and the control means lengthens at least one of the first and second sections when the rotation detecting means has detected an induced signal exceeding the reference threshold voltage in the second section.
Description
technical field [0001] The invention relates to a stepping motor control circuit and an analog electronic clock using the stepping motor control circuit. Background technique [0002] Conventionally, a stepping motor has been used in analog electronic clocks and the like: the stepping motor has: a stator having a rotor housing hole and a positioning portion for determining a rotor stop position; a rotor arranged in the rotor housing hole; and a coil, the stepping motor provides an alternating signal to the coil to cause the stator to generate magnetic flux, thereby causing the rotor to rotate and stop the rotor at a position corresponding to the positioning portion. [0003] As the control method of the stepping motor, the following correction driving method has been used, that is, when the stepping motor is driven by the main driving pulse, the induction signal generated due to the free rotation vibration of the stepping motor is detected. Whether or not rotation has occur...
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IPC IPC(8): H02P8/02G04C3/14
CPCH02P8/02G04C3/143
Inventor 长谷川贵则本村京志高仓昭间中三郎小笠原健治佐久本和实加藤一雄山本幸祐
Owner SEIKO INSTR INC