JPH0213224A - Motor drive stopper - Google Patents

Abstract

PURPOSE:To avoid the danger state of a motor by stopping driving of said motor through detecting the abnormal heat generation of the motor by a temperature detecting means. CONSTITUTION:A thermistor 4 for detecting the ambient temperature of a winding part is installed in a stepping motor 1. A signal of said thermistor 4 is compared with a set value by a voltage sensor 5, and when said temperature is higher than a specified value, gates 6a-6d are blocked by the output of said voltage sensor and the rotation of said motor 1 is stopped.

Description

DETAILED DESCRIPTION OF THE INVENTION Field of Industrial Application The present invention is applicable to motors and motor drivers used in printers, floppy disk devices, etc. due to the heat generation of motors such as stenobifugu motors or fan motors and the rise in the environmental temperature of the motors. The present invention relates to a motor drive stop device for protection.

Conventional motors generate abnormal heat when a large current flows through the windings due to a short circuit in the internal windings or a failure of the motor driver made of elements such as transistors.

However, if the motor is installed near other heating elements and in an environment with no air flow, the ambient temperature around the motor will rise abnormally. In these cases, the motor itself may fail or the motor driver may be destroyed. In order to prevent this, conventionally, an overcurrent protection circuit has been added to a part of the motor driver.

Problems to be Solved by the Invention However, in the conventional configuration described above, damage to the motor and motor driver is avoided by detecting overcurrent that occurs secondarily, and it is difficult to detect abnormal heat generation in the motor or the environmental temperature of the motor. It was not possible to quickly respond to the abnormal rise in

The present invention solves the conventional problems as described above, and provides a motor that can stop driving the motor by detecting heat generation in the motor and protect the motor and motor driver from destruction. The object of the present invention is to provide a drive stop device.

Means for Solving the Problems In order to achieve the above object, the present invention provides temperature detection means for detecting the ambient temperature of the windings of the motor, and means for stopping the drive of the motor by detecting the temperature detection means. It is equipped with the following.

Therefore, according to the present invention, when the motor generates abnormal heat due to a rise in the temperature of the motor itself or the environment, this abnormal heat generation can be detected by the temperature detection means and the drive of the motor can be stopped.

EXAMPLES Hereinafter, examples of the present invention will be described with reference to the drawings.

The figure is a schematic configuration diagram showing a motor in an embodiment of the present invention.

This embodiment is applied to a stepping motor.

In the figure, 1 is the stepping motor body, 2as 2
b, 2c12d are windings inside the stepping motor main body 1, 3a, 3b, 3c, 3d are windings 2as2
A motor driver consisting of elements such as transistors is connected to bs2cs2d, and 4 is the stepping motor main body 1.
This is a thermistor placed inside the winding to detect the ambient temperature of the winding, and its resistance value changes depending on the temperature. 5
are voltage detectors connected to thermistor 4, 6a, 6b
-, 6cs 6d is an AND gate, and drive signal 7a
, 7b, 7c, 7d and the output signal of the voltage detector 5 are input, and when the output signal of the voltage detector 5 is High, the drive signals 7a, 7b, 7c, 7d are input to the motor driver 3a.

Output to 3b-, 3c, and 3d. vM is a motor drive power supply voltage, and VC is a detection power supply voltage.

The operation of the above configuration will be described below.

When the stepping motor main body 1 is at a normal temperature, the resistance value of the thermistor 4 is high, the input voltage of the voltage detector 5 is high, and its output signal is High, so the drive signals 7a to 7d are an AND game) The input signal is input to the motor drivers 3a to 3d via pins 6a to 6d, and the stepping motor main body 1 continues to drive. Here, stepper motor body 1
When the sensor generates heat, the resistance value of the thermistor 4 decreases due to the heat, so that the input voltage of the voltage detector 5 decreases. When this input voltage falls below a preset voltage,
The output signal of the voltage detector 5 is low, and the drive signal 7a
7d is no longer transmitted to the motor drivers 3a to 3d.

Therefore, the driving of the stepping motor main body 1 is stopped.

As described above, according to the above embodiment, since the thermistor 4 is built into the stepping motor main body 1, when the stepping motor main body 1 generates heat, this temperature can be detected and driving of the motor can be stopped. .

Effects of the Invention As described above, according to the present invention, when the motor abnormally generates heat, the abnormal heat generation can be detected by the temperature detection means and the driving of the motor can be stopped. Dangerous conditions of the motor and motor driver caused by an abnormal rise in environmental temperature can be avoided.

FIG. 2 is a schematic configuration diagram showing a stop device.

1. Stepping motor body, 2a, zb, 2c
, 2d...winding, 3a, 3b13c, 3d...
・Motor driver, thermistor, 5...voltage detector,
6a, 6b, 6c.

AND gate, 7 a-, 7b s 7 c-, 7d
...Drive signal.

4... 6d...

Claims (1)

[Claims] 1. A motor drive stop device comprising: temperature detection means for detecting the ambient temperature of a winding portion of the motor; and means for stopping driving of the motor based on detection by the temperature detection means.