摘要:
A semiconductor device includes a plurality of semiconductor elements each having a front surface and a back surface; a front surface-side heatsink that is positioned on a front-surface side of the semiconductor elements and dissipates heat generated by the semiconductor elements; a back surface-side heatsink that is positioned on a back surface-side of the semiconductor elements and dissipates heat generated by the semiconductor elements; a sealing material that covers the semiconductor device except for a front surface of the front surface-side heatsink and a back surface of the back surface-side heatsink; a primer that is coated on at least one of the front surface-side heatsink and the back surface-side heatsink and improves contact with the sealing member; and a protruding portion positioned between the plurality of semiconductor elements, on at least one of the back surface of the front surface-side heatsink and the front surface of the back surface-side heatsink.
摘要:
A semiconductor device includes a plurality of semiconductor elements each having a front surface and a back surface; a front surface-side heatsink that is positioned on a front-surface side of the semiconductor elements and dissipates heat generated by the semiconductor elements; a back surface-side heatsink that is positioned on a back surface-side of the semiconductor elements and dissipates heat generated by the semiconductor elements; a sealing material that covers the semiconductor device except for a front surface of the front surface-side heatsink and a back surface of the back surface-side heatsink; a primer that is coated on at least one of the front surface-side heatsink and the back surface-side heatsink and improves contact with the sealing member; and a protruding portion positioned between the plurality of semiconductor elements, on at least one of the back surface of the front surface-side heatsink and the front surface of the back surface-side heatsink.
摘要:
A velocity control loop of a motor control apparatus including a notch filter. The notch filter attenuates a signal component at a central frequency from a motor driving command, and outputs the attenuated motor driving command. The driving of a motor is controlled based on the attenuated motor driving command. The central frequency of the notch filter is set equal to a frequency at which a phase of open loop frequency characteristics of the velocity control loop that does not include a notch filter is a value obtained by subtracting 180 degrees from a preset phase margin. An attenuation factor of the notch filter by which the signal component at the central frequency is attenuated is set so that a gradient of a phase diagram of the open loop frequency characteristics of the velocity control loop including the notch filter is substantially zero.
摘要:
A velocity control loop of a motor control apparatus including a notch filter. The notch filter attenuates a signal component at a central frequency from a motor driving command, and outputs the attenuated motor driving command. The driving of a motor is controlled based on the attenuated motor driving command. The central frequency of the notch filter is set equal to a frequency at which a phase of open loop frequency characteristics of the velocity control loop that does not include a notch filter is a value obtained by subtracting 180 degrees from a preset phase margin. An attenuation factor of the notch filter by which the signal component at the central frequency is attenuated is set so that a gradient of a phase diagram of the open loop frequency characteristics of the velocity control loop including the notch filter is substantially zero.
摘要:
A speed control means 7 for outputting a drive command signal for a motor 1 to make the speed of the motor 1 conform to the speed command signal based on a signal indicating the difference between the speed command signal and the detected speed of the motor; a filter 13 inserted in series with the speed control means 7 in the speed control loop, having a high frequency domain, a low frequency domain, and an intermediate frequency domain between the high frequency domain and the low frequency domain, a gain KL in the low frequency domain being larger than a gain KH in the high frequency domain, and having a phase lag characteristic so that the phase in the intermediate frequency domain is delayed; the speed control means 7 having a proportional controller 9 that multiplies input by a proportional gain KP and outputs the result, and the filter 13 being set so that phase lag occurs between a resonance frequency and an anti-resonance frequency of a mechanical system.
摘要:
A speed control apparatus includes a speed control part 12 for generating a source current command based on a difference between a speed command of a motor 4 and speed detection in which a speed of the motor 4 for driving a load 2 is detected, a notch filter 14 which can break a notch frequency resulting in a predetermined frequency selected among continuous frequency band widths and also generates a compensating current command in which the notch frequency is eliminated from the source current command signal, a notch filter adaptive part 16 for selecting the notch frequency so that the compensating current command in which a sustained vibration frequency component of the source current command is eliminated is generated from the notch filter 14, a subtracter 103 for generating an elimination portion current command resulting in a difference between the source current command and the compensating current command, and an adder 109 for adding the compensating current command and the elimination portion current command and generating a current command passed through the motor 4.
摘要:
A speed control means 7 for outputting a drive command signal for a motor 1 to make the speed of the motor 1 conform to the speed command signal based on a signal indicating the difference between the speed command signal and the detected speed of the motor; a filter 13 inserted in series with the speed control means 7 in the speed control loop, having a high frequency domain, a low frequency domain, and an intermediate frequency domain between the high frequency domain and the low frequency domain, a gain KL in the low frequency domain being larger than a gain KH in the high frequency domain, and having a phase lag characteristic so that the phase in the intermediate frequency domain is delayed; the speed control means 7 having a proportional controller 9 that multiplies input by a proportional gain KP and outputs the result, and the filter 13 being set so that phase lag occurs between a resonance frequency and an anti-resonance frequency of a mechanical system.
摘要:
A FSK code with reduced high frequency content is generated. First through fourth waveforms are provided to a selector which selects one of the four waveforms in accordance with a control signal which, in turn, is generated in accordance with a state indication signal identifying the presently selected one of the four waveforms. A D/A converter converts the selected digital waveform data to an analog waveform signal. First and second of the digital waveform data represent +sin .theta. and -sin .theta., and third and fourth of the digital waveform data represent +f(.theta.) and -f(.theta., respectively, where ##EQU1## wherein 0.ltoreq..theta..ltoreq.2.pi. and a, b and c are nonzero coefficients.
摘要:
A servo selection system includes a replacement-information display unit that displays at least a portion of replacement information corresponding to an input servo product before being replaced and a selected new-model servo product, and the replacement information includes a difference between a specification of the servo product before being replaced and a specification of the new-model servo product, and an operation guideline for replacing the servo product before being replaced with the selected new-model servo product.
摘要:
This invention provides a process for producing an electrolytic copper foil for a printed wiring board by supplying current between a rotary cathode and an electrolytic anode in a copper electrolyte so as to electrodeposit copper on the surface of the rotary cathode, wherein an anode for high electric current is placed opposite to the electrodeposition starting surface of the rotary cathode in such a manner that a part of the anode is projected above a liquid level of the copper electrolyte, and the copper electrolyte existing between the anode for high electric current and the opposed rotary cathode surface is electrolyzed by providing a high electric current with a current density higher than that of the electrolytic anode, and an apparatus for producing an electrolytic copper foil for a printed wiring board having excellent properties.