摘要:
In an inverter maintenance system, while an inverter of a user, a user support server of maker, and also, a portable telephone capable of accessing to a Web server are employed, such information required to maintain/manage the inverter is transferred/received by way of the portable telephone. Thus, various sorts of requests can be accepted by both the user support server and the Web server.
摘要:
In an inverter maintenance system, while an inverter of a user, a user support server of maker, and also, a portable telephone capable of accessing to a Web server are employed, such information required to maintain/manage the inverter is transferred/received by way of the portable telephone. Thus, various sorts of requests can be accepted by both the user support server and the Web server.
摘要:
In an inverter maintenance system, while an inverter of a user, a user support server of maker, and also, a portable telephone capable of accessing to a Web server are employed, such information required to maintain/manage the inverter is transferred/received by way of the portable telephone. Thus, various sorts of requests can be accepted by both the user support server and the Web server.
摘要:
To provide a hybrid type or battery type working machine which hardly gives a feeling of strangeness on an operation to an operator and in which electric power stored in a storage battery can be used effectively within an operation scheduled time set in advance.An amount of reduction in the amount of electricity stored in an electric storage device 60 in a predetermined time t1 after an working machine starts up is obtained, and an operation possible time t2 is obtained from the obtained amount of reduction and a residual amount of the electricity stored in the electric storage device 60. Further, determination is made as to whether the obtained operation possible time t2 reaches a remaining time of an operation scheduled time obtained by subtracting a currently spent real operation time from the operation schedule time set in advance. When determination is made that the operation possible time t2 does not reach the remaining time of the operation schedule time, a pump absorption horsepower maximum value is reduced to such a value that the operation possible time can reach the remaining time of the operation scheduled time.
摘要:
A position detecting device which can increase accuracy in detecting the pole position of a motor used to perform quick acceleration and deceleration over the range from a zero speed to a high rotation speed, and a synchronous motor driving device using the position detecting device. A position detector detects basic-wave component signals in sensor signals and executes position calculation. A correcting unit calculates signal information representing at least one of a gain, an offset and a phase by a phase detector from the basic-wave component signals detected by an error calculator, and makes correction based on the calculated signal information such that a position detection error is zero.
摘要:
Construction machine capable of incorporating an engine and using an external power source. The construction machine includes an electrical storage device performing a charge with the external power source, uses the electrical storage device to provide assist when the power of the engine is insufficient, uses an electrical charge in the electrical storage device systematically in accordance with work time, and efficiently uses the electrical storage device by controlling its discharge amount in accordance with load status. The construction machine includes the engine, accessory loads connected to the engine, an assist electric motor driven by the engine, electrical power converters for converting an AC current, which is the output current of the assist electric motor, to a DC current, and the electrical storage device connected to the DC side of each electrical power converter. The electrical storage device becomes charged through a charging device from the external power source.
摘要:
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 prime mover 03; a power supply circuit 30 that uses a generator voltage VR obtained by rectifying a generator output PR and a trolley voltage VL obtained by rectifying an incoming power PL from a trolley feeder 10 as a driving voltage of a load device 12; and a control means 20 that controls drive of the prime mover 03 and opening and closing of a plurality of switches and the like included in the power supply circuit 30 are included. The power supply circuit 30 is configured by connecting a pair of second rectifying means D1 that rectifies the incoming power from the trolley feeder 10 and a second switch S2 connected in series therewith in parallel with a pair of first rectifying means 05 that rectifies the generator output PR and a first switch S1 connected in series therewith, and connecting a third switch S3 in parallel with the second switch S2.
摘要:
A collector voltage of a power management semiconductor device is detected by a first comparator, and when the detected collector voltage exceeds a first reference voltage, the first comparator outputs a first detection signal. Furthermore, a gate voltage of the power management semiconductor device is detected by a second comparator, and when the detected gate voltage exceeds a second reference voltage, the second comparator outputs a second detection signal. The second reference voltage is a minimum gate voltage for feeding a rated power to the power management semiconductor device or over, and less than a line power voltage of a drive circuit of the power management semiconductor device. When both the first detection signal and second detection signal are being outputted, the gate voltage is reduced by a gate voltage reduction means so as to protect the power management semiconductor device from overcurrent and overvoltage.
摘要:
A drive circuit that controls a switching device ON/OFF and a soft cutoff command circuit that gradually decreases the gate terminal voltage of the switching device when short circuit of the switching device is detected. Additionally, an ON-pulse retention command circuit retains the output of the drive circuit ON when the gate terminal voltage is judged to have exceeded a specified value by a gate voltage judgment comparator that detects the gate terminal voltage of the switching device.
摘要:
A collector voltage of a power management semiconductor device is detected by a first comparator, and when the detected collector voltage exceeds a first reference voltage, the first comparator outputs a first detection signal. Furthermore, a gate voltage of the power management semiconductor device is detected by a second comparator, and when the detected gate voltage exceeds a second reference voltage, the second comparator outputs a second detection signal. The second reference voltage is a minimum gate voltage for feeding a rated power to the power management semiconductor device or over, and less than a line power voltage of a drive circuit of the power management semiconductor device. When both the first detection signal and second detection signal are being outputted, the gate voltage is reduced by a gate voltage reduction means so as to protect the power management semiconductor device from overcurrent and overvoltage.