摘要:
A first semiconductor switching circuit and a second semiconductor switching circuit in the form of an intelligent power module including IGBTs (2) are connected in parallel with their IGBTs (2A, 2B) connected together both at collectors and at emitters; the emitter connection is such that the emitters are connected with respective resistors (16A, 16B) of the same resistance, which are connected at auxiliary terminals (15A, 15B) through a conductor (18). The gates of IGBTs (2A, 2B) are connected together through a conductor (17) by a ferrite bead core (19) having high impedance at a predetermined frequency.
摘要:
There is provided a control device for an electric motor that controls the operation of the electric motor by outputting PWM signals to switching elements included in an inverter. The control device for the electric motor includes a voltage-command generating unit 21 configured to generate, as voltage commands Vu*, Vv*, and Vw*, a superimposed wave signal obtained by superimposing, on a sine wave having an inverter output frequency FINV as a fundamental frequency, a third harmonic of the sine wave and a PWM-signal generating unit 23 configured to generate PWM signals U, V, W, X, Y, and Z by comparing the amplitudes of the voltage commands output by the voltage-command generating unit 21 and the amplitude of a carrier signal CAR.
摘要:
A filter device 5 that removes a noise current generated by an inverter 6 includes a first filter capacitor 52a that is provided in parallel to a direct-current unit of the inverter 6, a first filter reactor 51a that is provided between a high-potential side of the first filter capacitor 52a and an overhead line 1 that is a power supply source of direct-current power, and a series circuit unit 56 in which a fuse 53 serving as a circuit disconnecting unit that is disconnected when a current larger than a rated current flows therein, a second filter reactor 51b serving as an inductance element, and a second filter capacitor 52b serving as a capacitance element are connected in series, where one end of the series circuit unit 56 is connected to a low-potential side of the first filter capacitor 52a and one end of the first filter reactor 51a is connected to the series circuit unit 56.