| 摘要 |
<P>PROBLEM TO BE SOLVED: To measure temperatures of an electromechanical device and an electromagnetic coil without mounting separate temperature acquiring means in the vicinity of the electromagnetic coil. <P>SOLUTION: An electromechanical device 10 comprises: a permanent magnet 200; an electromagnetic coil 100A; a sensor 300 for detecting an electrical angle of the permanent magnet 200; controllers 240 and 400 for PWM driving the electromagnetic coil 100A based on a signal from the sensor 300; and a resistor 715 connected to the electromagnetic coil 100A in series when temperature of the electromechanical device 10 is measured. During a time period in which a driving section does not apply a driving voltage to the electromagnetic coil 100A when PWM-driving the electromagnetic coil 100A, the controllers 240 and 400 measure voltages of both ends of the resistor 715, acquire resistance of the electromagnetic coil 100A by using the voltages thereof and acquire temperature of the electromagnetic coil 100A by using the resistance of the electromagnetic coil 100A. <P>COPYRIGHT: (C)2012,JPO&INPIT |
