JPS6269118A - Driving circuit for free gyro device - Google Patents

Abstract

PURPOSE:To designate driving coils to excite and to certainly start a rotor magnet by supplying an electric current to reference coils when a driving power source is supplied to the titled device. CONSTITUTION:When the driving power is supplied to the device, the power source voltage is supplied to the reference coils 8 and 9 via a switch circuit 7 and a D.C. magnetic field is generated on the coils 8 and 9. This magnetic field attracts a magnetic pole of the rotor magnet 5 and the magnet 5 is fixed on the position of the reference coils. Further, since the inputs of driving circuits 1 and 2 are short-circuited by a switch circuit 6 and the electric current is not supplied to the driving coils 12-15, the rotational torque is not generated on the magnet 5. Then, a time-delay circuit 16 outputs a signal to change over circuits 6 and 7 after the lapse of the prescribed time set after the voltage is supplied. The circuits 6 and 7 are changed over by the output of the circuit 16 and the signals of magnetic pole position detecting elements 3 and 4 are inputted to the circuits 1 and 2 and the magnet 5 is rotated and started and the induced voltage can be outputted from the coils 8 and 9.

Description

[Detailed Description of the Invention] [Field of Industrial Application] The present invention relates to a drive circuit for a two-axis free-standing gyro device that is equipped with a rotor magnet and that is spatially stabilized by rotating at high speed due to the magnetic action between the magnet and the drive coil. .

[Conventional technology]

Figure 2 is a front external view of a conventional example of this type of gyro device.
FIG. 8 is a right side external view of FIG. 2, and FIG. 4 is a block diagram of the rotor magnet drive circuit.

In this gyro device, the magnetic pole of the rotor magnet 5 attached to the gyro part is detected by two magnetic pole position detection elements 8.4 (Hall ICs, etc.) placed around the gyro, and the magnetic poles are placed symmetrically around the gyro. 4 drive coils 12.1B.

14.15, the rotor magnet 5 is caused by the interaction between the magnetic field generated when current is passed through the drive circuits 1 and 2 sequentially through the drive coils located in an appropriate positional relationship with the rotor magnet 5 and the magnetic field of the rotor magnet 5. A rotational driving torque is generated to maintain rotation. In addition, four reference coils 8.9. placed around the gyro. When the rotor magnet 5 rotates, a voltage is induced in lO, 11 by the electromagnetic induction effect caused by K, and this voltage is used as a reference signal for defining the gyro coordinate axes.

[Problem that the invention seeks to solve]

The drive circuit for the rotor magnet 5 of the conventional gyro device described above is such that the gyro has a large degree of freedom and the distance between the rotor magnet 5 and the magnetic pole position detection element 8.4 is large enough to detect the magnet magnetic field. First, when the drive coil 12.18.14.15 to be driven cannot be specified, or when the magnetic pole of the rotor magnet 5 is located between the two magnetic pole position detection elements 8.4, The same signal is output from .4, and the drive circuit 1
If the same current is applied to the drive coils that are adjacent to each other, the rotor magnet 5 will remain stopped at that position and will not be able to start rotating.

[Means for solving problems]

The drive circuit of the l-free gyro device of the present invention includes a switch circuit for supplying a DC current to a reference coil when driving power is supplied and extracting an induced voltage from the reference coil as a reference signal after startup; A switch circuit short-circuits the drive circuit input and switches to driving by the magnetic pole position detection element after a certain period of time, and a time delay circuit to control the two switch circuits described above.
It is characterized by ii/.

After supplying driving power to the device, the interaction between the induced magnetic field generated by passing current through a pair of reference coils and the magnetic field of the magnet causes the magnet to stand up in the direction of the rotation axis, and the magnetic poles of the magnet are moved to the reference coil position. By fixing it to , the above-mentioned conventional problems are solved.

〔Example〕

Next, embodiments of the present invention will be described with reference to the drawings.

FIG. 1 is a block diagram of a driving circuit of a gyro device according to an embodiment of the present invention.

The drive circuit of this embodiment is a drive switch? 18 is closed and when driving power is supplied, DC current is supplied to the reference coil 8.9, and after startup, the switch circuit 7 is used to take out the induced voltage from the reference coil 8.9 as a reference signal, and when the driving power is supplied, the driving A switch circuit 6 for short-circuiting the input of the circuit 1.2 and switching to driving by the magnetic pole position detection element 8.4 after a certain period of time, and a time delay circuit 16 for controlling these two switch circuits 6.7. It is characterized by having been improved.

Next, the operation of this embodiment will be explained.

When the drive switch F-18 is closed and drive power is supplied to the device, the power supply magnetic pressure is applied to the reference coil 8 via the switch circuit 7.
．． 9 to generate a DC magnetic field in the reference coil 8.9. This magnetic field attracts the magnetic pole of the red magnet 5, and the magnet 5 is fixed at the reference coil position. Further, the input of the drive circuit 1.2 is short-circuited by the switch circuit 6 to the drive coil 12.1B.

Since no current is supplied to magnets 14 and 15, no rotational torque is generated in magnet 5. Then, the time delay circuit 16 outputs a signal for switching the switch circuit 6.7 after a predetermined period of time has elapsed after power is supplied. By the output of this time delay circuit 16, the switch circuit 6
．． 7 is switched and the magnetic pole position detection element 8.40 signal is input to the drive circuit 1.2, so that the rotor magnet 5 is started to rotate in the same manner as in the conventional example, and the reference coil 8.
The induced voltage from 9 can be output.

〔Effect of the invention〕

As explained above, the present invention supplies a current to a reference coil when drive power is supplied to the device, and detects the drive coil and magnetic pole position most suitable for starting rotation of the rotor magnet by the magnetic field generated by the reference coil. By temporarily fixing the element in an upright position, the drive coil to be excited can be specified by the output of the magnetic pole position detection element.
The conventional rotation method has the effect of reliably starting the rotor magnet.

[Brief explanation of drawings]

FIG. 1 is a block diagram showing an embodiment of a drive circuit for a free gyro device according to the present invention, FIG. 2 is a front external view of a conventional gyro device, and FIG. 8 is a right side external view of FIG. Fourth
The figure is a block diagram of a conventional rotor magnet drive circuit. 1.2... Drive circuit, 8.4... Magnetic pole position detection element. 5...Rotor magnet. 6.7... Switch circuit, 8.9... Reference coil. 12.111S, 14.15... Drive coil. 16...Time delay circuit. 17... Drive power supply. 18... Drive switch.

Claims (1)

[Claims] In a drive circuit for a free gyro device equipped with a rotor magnet, a switch for supplying direct current to a reference coil when driving power is supplied, and extracting the induced voltage from the reference coil as a reference signal after startup. circuit, a switch circuit for short-circuiting the drive circuit input when drive power is supplied and switching to drive by the magnetic pole position detection element after a certain period of time, and a time delay circuit for controlling the two switch circuits described above. A drive circuit for a free gyro device, characterized by: