Analog timepiece and control method of analog timepiece

Abstract

The invention provides an analog timepiece and a control method of the analog timepiece, thereby reliably controlling rotation of a rotor in one unit step. There is provided an analog timepiece including an hour hand, a minute hand, and a second hand which are rotated by a unit step operation of a stepping motor (105). The analog timepiece includes a rotor (30) that rotates the hour hand, the minute hand, and the second hand, and that has a magnetic polarity, a stator (20) that includes magnetic pole portions (20A-20C) disposed around the rotor (30), coils (50A, 50B) that excite the magnetic pole portions (20A-20C), and a control unit that controls each unit step of the rotor (30) in accordance with each pulse group by applying a pulse group including a rotary pulse for rotating the rotor (30) and a braking pulse for braking rotation of the rotor (30), which is applied before the rotary pulse is applied, to the coil (50A, 50B).

Description

technical field [0001] The invention relates to an analog electronic clock and a control method for the analog electronic clock. Background technique [0002] Conventionally, a stepping motor for moving hands such as an hour hand, a minute hand, and a second hand has been used in analog electronic timepieces. In an analog electronic timepiece, it is desirable to reverse the rotation of the hands by advancing them. In the case where the stepper motor can be reversed by dialing the speed, it is necessary to reduce the holding torque of the rotor. However, in the case of a stepping motor having a one-coil structure, a step-out tends to occur due to a reduction in holding torque. [0003] As a stepping motor capable of being reversed by dialing it up, for example, as described in Patent Document 1, there is a stepping motor (hereinafter referred to as "two-coil motor") having a stator having three magnetic pole portions and two coils. Generally speaking, compared with the ab...

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Problems solved by technology

[0007] However, in the two-coil motor described in the above-mentioned Patent Document 1, since the pulse having a braking effect is output after the pulse for driving the rotor is output, the rotor cannot be freely vibrated to generate an induced voltage in the coil.

Therefore, it is difficult to determine whether the rotor has rotated in unit steps

Therefore, in conventional analog electronic timepieces, it may not be possible to ensure the free vibration of the rotor of the stepping motor per unit step, and it may be difficult to reliably detect the induced voltage of the coil, and it may not be possible to reliably control the stepping motor according to the unit step. rotor

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