JPH0428799U - - Google Patents

Description

[Brief explanation of the drawing]

FIG. 1 is a circuit diagram showing an embodiment of the present invention;
Figure 2 is a diagram showing the relationship between the energization amount of the motor in Figure 1 and the current command signal, Figure 3 is a conventional circuit diagram, and Figure 4 is a diagram showing the relationship between the energization amount of the motor and the current command signal in Figure 3. FIG. 1...Motor, 5...Transistor drive circuit,
7... Relay, 8... Current detector, 10, 11...
…comparator.

Claims (1)

[Scope of utility model registration request] a drive control means for outputting a drive signal for controlling the amount of current to the motor based on the signal level of the current command signal; a power switch for disconnecting the energizing circuit of the motor from the power supply; transistor switch means for controlling energization to the motor; and abnormality detection means for outputting an abnormality determination signal to turn off the power switch when detecting an abnormality in the energization circuit based on the amount of energization in the energization circuit of the motor. In a fail-safe device for a motor drive device configured to stop energizing the motor when an abnormality is detected, the current command signal is used as an input for setting a voltage range window, and the current command signal is used as an input for setting a voltage range window, and A fail-safe motor drive device, characterized in that the abnormality detection means includes a window comparator that uses a detection signal of the amount of energization as a comparison input and outputs the abnormality determination signal when the comparison input is outside the range of the window. Device.