A work machine prevents a fault in a swing electric motor if an uneven coil temperature increase occurs in the swing electric motor during swing press operation and related operations. The work machine includes: a swing structure (20); an electric motor (2...

A power converter (100) includes a first set (102) of transistors electrically connected in series, a second set (104) of transistors electrically connected in series, and an AC link (108). The second set of transistors is electrically connected in paralle...

A power supply control device comprises: a generator (10) driven by an engine; a lead acid battery (30) and a lithium ion battery (40) connected in parallel to the generator; an SOC detector that detects SOC of the lead acid battery; and a charge controlle...

Even in a situation other than engine normal operation such as engine stall, the output voltage of the three-phase brushless motor is prevented from causing the excessive voltage to be applied to an external load. [0002] A brushless motor control apparatus...

In a drive system for standardizing a converter for a plurality of power sources, physical circuits as well as control of the converter need to be switched when a train enters a non-electrified route from an electrified route and when a train enters an ele...

A typical traction system that does not have a storage battery device for a direct-current power unit of a main circuit cannot ensure exciting energy necessary upon activation of an induction generator. Thus, there is a problem that the typical traction sy...

PROBLEM TO BE SOLVED: To provide an electric drive vehicle that can be implemented inexpensively with a simple configuration, and includes a long-life power supply circuit of a diesel boost system. SOLUTION: A prime mover 03; a generator 04 driven by the p...