JPS63212178A - Motor security maintaining device - Google Patents

Abstract

PURPOSE:To make it possible to detect a breakdown of a magnet securely by spreading a conductive material to be in a disconnection condition only when the magnet is broken, at the inside of a motor casing, and applying a voltage to the conductive member to detect the conductive condition thereof. CONSTITUTION:In a power steering motor 1, a magnet 11 to give a magnetic field to rotate an armature 14 is installed inside a motor case 10. And a rotary shaft 12 is supported rotatable by bearings B10 and B20 which are supported at the motor case 10, and the armature 14 wound with a coil is fixed at the rotary shaft 12. In such a motor 1, a conductive member 50 to detect the motor abnormality, consisting of a paint mixing copper powder, for example, is spread in a meandering form. And a voltage is applied to the both ends of the conductive member 50 to a decide the conductive condition, and an abnormality of the motor 1 is detected. When the abnormality is detected, the control of the motor 1 is stopped.

Description

[Detailed description of the invention] <Industrial application field> The present invention relates to a motor safety device.

<Prior art> In the electric power steering device, the method shown in Fig. 6(a), [Yes]
) An armature 504 is installed inside the motor case 500 as shown in
A magnet 501 is attached to provide a magnetic field to rotate the rotating shaft 502, and both ends of the rotating shaft 502 are attached to a bearing Bl.

A motor 600 is used, which includes an armature 504 rotatably supported by B2 and around which a coil 503 is wound.

A brush 50 is attached to the coil 503 of this motor 600.
5, 506, a magnetic field is generated from the coil 503, which repels and attracts the magnetic field of the magnet inside the motor case 500, thereby controlling the steering force to rotate the rotating shaft 502. It is carried out.

<Problems to be Solved by the Invention> However, in such a conventional device, if an external impact is applied to the motor and the magnet 501 is chipped or detached from the motor case 500, the motor 600
It was not equipped with safety equipment.

For this reason, there was a risk that the magnet 501, which was chipped or detached, would get caught between the armature 504 and the motor case 500, and the motor would lock.

<Means for solving the problem> The present invention applies a conductive member that becomes discontinuous only when the magnet is damaged inside the motor case, applies a voltage to the conductive member, and detects the conductive state of the conductive member. , an abnormality detection means for detecting an abnormality in the motor.

Function: Abnormalities in the motor are detected by detecting the energization state of the conductive material that is continuously applied to the inside of the motor case.

<Example> Embodiments of the present invention will be described below based on the drawings.

FIG. 1 is an overall configuration diagram for explaining an example of application of the present invention to an electric power steering device, and mainly shows a power steering motor 100.
, a motor control device 101, and a safety device 102 (abnormality detection means).

The motor 100 has a motor case 1 as shown in FIG.
A magnet 11 for applying a magnetic field to rotate the armature 14 is attached to the inside of the armature 14. Also, a bearing BIO supported by the motor case 10.

The rotating shaft 12 is rotatably supported by B20.

An armature 14 having a coil wound thereon is fixed to the rotating shaft 12.

Further, inside the motor case 10, there is a conductive member 50 made of paint mixed with copper powder, for example, for detecting abnormalities in the motor.
As shown in FIG. 3, the inside of the motor case 10 and the magnet l
It is applied alternately and continuously on the l.

The motor control device 101 includes a computer 103 and a drive unit 104 for driving the motor 100.

The computer 103 is a circuit vehicle speed sensor.

Detection outputs from the steering angle center and the like are inputted via a circuit interface to control the motor 100 according to running conditions.

Further, the drive unit 104 drives the motor 100 in accordance with a control signal commanded from the computer 103.

FIG. 4 shows a safety device 102 for detecting an abnormality in a motor according to the present invention.
FIG.

This safety device 102 includes a conductive member 50 and resistors R1 to R4,
It is composed of a comparator C1.

A resistor R1 has a power supply +V connected in series to the ten terminals of the comparator C1, and a voltage Ml across the conductive member 500 divided by the conductive member 50 (voltage between terminal A and terminal 8).
is entered.

This voltage v1 is L when the conductive member 50 is conductive.
The value of the resistor R1 is set in advance so that it becomes an OW level (0■) and a HIGH level (for example, 5■) when it is non-conductive (disconnected).

Further, one terminal of the comparator C1 is connected to a resistor R that is voltage-divided by resistors R2 and R3 connected in series to the power supply.
The voltage across both ends of 3 is manually input as the reference voltage v2.

This voltage v2 is set to a constant voltage between the LOW level and the HIGH level.

The comparator C1 has an open collector output. A pull-up resistor R4 is connected to the output part of this comparator C1, and the other end of this resistor R4 is connected to the power supply +■.

Next, the computer 10 of the motor control device 101 in FIG.
The operation of step 3 will be explained based on the flowchart of FIG.

First, when the driver turns on the power switch of the circuit, the computer 101 is powered on and the following steps are executed.

In step 200, the output of the security device 102 is LOW.
level (Motor 1 is normal) or HIGH level (Motor 1 is normal.)
Motor 1 is abnormal. =The conductive member is disconnected. )
If the level is LOW, step 200 is executed again after a predetermined cycle time. If the level is HIGH, the process moves to the next step 201 and the control of the motor 1 is stopped. Next, the process moves to step 202 and the driver is warned that the motor l is abnormal.

As described above, the conductive member 50 is continuously applied to the inside of the motor case 10, and the terminals A and B of this conductive member 50 are
A voltage is applied 4 between them, and the computer 10
Since an abnormality in the motor 1 is detected by making a judgment based on 3, if an impact or the like is applied to the motor 1 and the magnet 11 is chipped or detached, the control of the motor 1 can be stopped and the driver can be warned.

<Effects of the Invention> As described above, in the present invention, a conductive member that becomes discontinuous only when a magnet is damaged is applied to the inside of the motor case, and a voltage is applied to this conductive member to determine the conductive state of the conductive member. Since it is designed to detect this, there is an advantage that damage to the magnet inside the motor case can be detected.

Furthermore, the signal when damage to the magnet is detected can be used to stop motor control and issue a warning.

[Brief explanation of the drawing]

1 to 5 show embodiments of the present invention, FIG. 1 is an overall configuration diagram of an electric power steering device showing an embodiment of the present invention, and FIGS. 2(a) and 2(b) is a sectional view of the motor 100 in FIG. 1, FIG. 3 is a diagram for explaining the conductive member coated inside the motor case, FIG. 4 is a circuit diagram of the safety device, and FIG.
This figure is a flowchart for explaining the operation of the computer '103 of FIG. 1, and FIG. 6 is a sectional view of a conventional motor. 1.100,600...Motor, 10,500...
Motor case, 11,501...Magnet, 13.503
... Coil, 50... Conductive member.

Claims (1)

[Claims] (1) In a drive device that drives a motor with a magnet attached inside the motor case, a conductive member that becomes discontinuous only when the magnet is damaged is applied to the inside of the motor case, and a voltage is applied to this conductive member, A motor safety device comprising an abnormality detection means for detecting a conduction state of the conductive member and detecting an abnormality in the motor.