JPH04319617A - Starting circuit of rotation of gyro apparatus - Google Patents

Abstract

PURPOSE:To ensure a stable start of a rotor magnet at all times irrespective of the relationship in relative positions between magnetic pole detecting sensors and the rotor magnet. CONSTITUTION:A rotor magnet 8 is rotated by drive currents impressed on drive coils 9a to 9d by drive circuits 1 and 2, and detection outputs of Hall ICs 6 and 7 being magnetic pole detecting sensors for the rotor magnet 8 are utilized for the drive currents which are necessary for the start of the rotation. A determining element 5 is provided for a starting circuit of a gyro apparatus which is provided with this rotor magnet 8. It is determined thereby whether outputs of the Hall ICs 6 and 7 in a pair are the same or not, and when they are the same, a signal having reverse polarity to the one of these signals being the same is outputted. A switching circuit 3 makes a switch 4 connected so that the output of the determining element 5 be passed, in a limited time when the rotation is started, while making it switch over so that the output of the Hall IC 7 be passed, after the limited time passes.

Description

[Detailed description of the invention]

0001

[Field of Industrial Application] The present invention relates to a rotation starting circuit for a gyro device, and more particularly to a rotation starting circuit for a gyro device, which is equipped with a rotor magnet, and rotates the rotor magnet at high speed by a rotating magnetic field formed by a drive coil of the gyro, thereby ensuring spatial stability. The present invention relates to a rotation starting circuit for an axis-free gyro type gyro device.

0002

2. Description of the Related Art Conventionally, this type of gyro device has a structure shown in FIG. FIG. 2(a) is a front view of the gyro device, and FIG. 2(b) is a side view of the gyro device. Further, FIG. 3 shows a configuration diagram of a rotation starting circuit of a conventional gyro device.

The rotor magnet 8 shown in FIG. 2 is rotated by a rotating magnetic field formed by a drive current applied to drive coils 9a to 9d. The drive current required for this rotation start and subsequent steady rotation is generated using the detection output of the magnetic pole detection sensor of the rotor magnet 8, usually two Hall ICs 6 and 7 that detect magnetism using the Hall effect. .

[0004] Hall ICs 6 and 7 are rotor magnets 8
are arranged at 90 degrees to each other with respect to the rotation axis of
While detecting the magnetic poles N and S of the rotor magnet 8, the output thereof is supplied to the drive circuits 1 and 2 shown in FIG.

[0005] The drive circuits 1 and 2 each include a Hall IC 6
A drive current is generated based on the outputs of , 7, and as shown in FIG.
As shown in the figure, among the four drive coils 9a to 9d arranged symmetrically around the gyro, the rotor magnet is sequentially supplied to the drive coil in the positional relationship to drive the rotor magnet, and the interaction with the rotating magnetic field generated thereby. This causes the rotor magnet to generate rotational torque and perform rotation including rotation start.

[0006]

[Problems to be Solved by the Invention] When starting the rotation of the conventional rotor magnet described above, when the magnetic pole of the rotor magnet is located between the two magnetic pole detection sensors that detect it, the two magnetic pole detection sensors are the same. Outputs the content signal,
The problem is that the drive circuit passes the same drive current to adjacent drive coils, so a rotating magnetic field is not formed, and the rotor magnet remains in that state and cannot be started.

SUMMARY OF THE INVENTION In view of the above-mentioned problems, it is an object of the present invention to provide a rotation starting circuit for a gyro device that eliminates the failure to start the rotor magnet at the time of starting rotation.

[0008]

[Means for Solving the Problems] The starting circuit of the gyro device of the present invention is configured such that the starting circuit of the gyro device of the present invention is arranged at a 90-degree angle with respect to the rotation axis of the rotor magnet which is rotated by the rotating magnetic field formed by the drive coil.
In a rotation starting circuit of a gyro device that rotates using an output of a pair of magnetic pole detection sensors arranged to detect the magnetic poles of the rotor magnet while maintaining a degree positional relationship to the drive coil as an input source of a drive current, the rotor magnet When the magnetic pole of the rotor magnet is located in the center of the pair of magnetic pole detection sensors when the rotation starts, the outputs of the pair of magnetic pole detection sensors are in the same state, and generation of a rotating magnetic field by the drive coil cannot be ensured. The rotor magnet is configured to include means for reversing the polarities of the outputs of the pair of magnetic pole detection sensors for only a predetermined set time to enable rotation of the rotor magnet.

[0009]

DESCRIPTION OF THE PREFERRED EMBODIMENTS Next, the present invention will be explained with reference to the drawings. FIG. 1 is a block diagram of an embodiment of the present invention, and shows a hole I
C6, 7, rotor magnet 8, drive coils 9a to 9D
and drive circuits 1 and 2 and switching circuit 3 that are directly related to the present invention.
, a switch 4, and a determination section 5.

Next, the operation of the embodiment shown in FIG. 1 will be explained.

When the magnetic pole of the rotor magnet 8 is located between the two Hall ICs 6 and 7, the two Hall ICs
cannot detect the magnetic pole, and each output Hall IC6
Output E1 and Hall IC7 output E2 are the same signal (for example, H
(high) level).

The determination unit 5 output E3 output from the determination unit 5 is as follows:
When the Hall IC 6 output E1 and the Hall IC 7 output E2 are the same signal (H level), they are set to the L (low) level of opposite polarity. When the gyro device starts rotating, the switch 4 is connected to the output side of the determination section 5, so that an L-level drive signal is applied to the drive circuit 2.

On the other hand, since the Hall IC 6 output E1 (H level) is applied to the drive circuit 1, each of the drive circuits 1 and 2 sequentially applies currents of different polarities to the drive coils in the positional relationship to be driven. It is possible to generate the rotational torque necessary for starting the flow rotation.

[0014] When the Hall IC 6 output E1 and the Hall IC 7 output E2 are the same signal, the switch 4 is connected to the judgment section 5 output side, and the Hall IC 6 output E1 and the Hall IC 7 output
If the C7 outputs E2 are different, the switching circuit 3 controls the connection to one of the Hall IC7 outputs E2.

In this manner, even if the magnetic pole of the rotor magnet 8 is located between the two Hall ICs 6 and 7 at the time of startup, the rotation of the rotor magnet can be reliably started.

[0016]

[Effects of the Invention] As explained above, the present invention provides a rotation starting circuit for a pre-gyro device equipped with a rotor magnet, in which the starting magnetic outputs of a pair of magnetic pole detection sensors that detect the magnetic poles of the rotor magnet are in the same state. By determining whether or not the rotation of the rotor magnet is started, the rotation of the rotor magnet can be ensured by determining whether or not the rotor magnet is rotating, and by making it possible to sequentially supply drive current to the drive coil even if the magnetic pole of the rotor magnet is located between the two magnetic pole detection sensors at the time of startup. This has the effect that it can be made to do so.

[Brief explanation of drawings]

FIG. 1 is a configuration diagram of an embodiment of the present invention.

FIG. 2 is a front view (a) and a side view (b) of a gyro device equipped with a conventional rotor magnet.

FIG. 3 is a configuration diagram of a rotation starting circuit of a gyro device equipped with a conventional rotor magnet.

[Explanation of symbols]

1, 2 Drive circuit 3 Switching circuit 4 Switch 5 Judgment section 6,7 Hall IC 8 Rotor magnet 9a-9d Drive coil

Claims (1)

[Claims] 1. A pair of magnetic pole detection sensors arranged to detect the magnetic poles of the rotor magnet while maintaining a 90 degree positional relationship with respect to the rotation axis of the rotor magnet which is rotated by a rotating magnetic field formed by a drive coil. In a rotation starting circuit of a gyro device that rotates as an input source of a drive current that provides an output to the drive coil, the magnetic pole of the rotor magnet occupies the center of the pair of magnetic pole detection sensors when the rotor magnet starts rotating; If the outputs of the pair of magnetic pole detection sensors are in the same state and generation of a rotating magnetic field by the drive coil cannot be ensured, the polarities of the outputs of the pair of magnetic pole detection sensors are reversed to each other only for a predetermined set time. A rotation starting circuit for a gyro device, comprising means for starting rotation of a rotor magnet.