| 摘要 |
PURPOSE: To measure the temperature without interrupting the operation by measuring the progress of EMF induced in winding, in time phase where the winding is in nocurrent condition, and obtaining the temperature. CONSTITUTION: For a device to measure the temperature of a motor, a current is added to three motor coils 1-3 through connector terminals 4-6, according to the motor rectification work, and this is provided with a differential amplifier 7 which has input resistors 8-10 and a feedback coupling resistor 11, for evaluation of the induction voltage of the phase. A current to be added to the motor 1 is led to this amplifier 7, and the output signal is led to an integrator 13 through an input resistor 12. Moreover, a control circuit 15 detects the zero passage of voltage with the voltage evaluation of the motor coil 1, and further a rectification signal is led. The control circuit 15 controls the switch 16 for discharge of a feedback capacitor 14, dependent upon these signals. With this, the output signal of the integrator 13 is led to the evaluator 17, and it forms an error information signal, and it is used for indication, etc. |
