摘要:
In a method of detecting synchronization loss in a stepping motor, a means for applying either control current or control voltage to a coil of each phase to thereby drive a stepping motor and a means for individually measuring a back EMF voltage induced at the coil of each phase are employed, wherein application of either the control current or the control voltage at the coil of each phase is halted by turns phase by phase for such a short time period as not to affect rotation of a rotor of the stepping motor at a predetermined timing within one step period of the rotor, the back EMF voltage at the coil is measured during the short time period, and the stepping motor is judged to lose synchronization when the measurement result of the back EMF voltage at the coil of at least one phase satisfies a detection criterion.
摘要:
In a method of detecting synchronization loss in a stepping motor, a means for applying either control current or control voltage to a coil of each phase to thereby drive a stepping motor and a means for individually measuring a back EMF voltage induced at the coil of each phase are employed, wherein application of either the control current or the control voltage at the coil of each phase is halted by turns phase by phase for such a short time period as not to affect rotation of a rotor of the stepping motor at a predetermined timing within one step period of the rotor, the back EMF voltage at the coil is measured during the short time period, and the stepping motor is judged to lose synchronization when the measurement result of the back EMF voltage at the coil of at least one phase satisfies a detection criterion.
摘要:
A motor control device for a stepping motor including at least two phase coils and a rotor is provided. The motor control device includes a control unit which applies a pulse voltage subjected to pulse width modulation, to each of the at least two phase coils, a back electromotive voltage measuring unit which provides a halt period to temporarily halt the application of the pulse voltage to one of the phase coils when a direction of the coil current flowing in the one phase coil is switched, and which measures a back electromotive voltage induced in the one phase coil during the halt period, an out-of-step detecting unit which detects an out-of-step of the stepping motor if the measured back electromotive voltage satisfies a predetermined criterion, and a voltage control unit which sets a voltage for all phase coils other than the one phase coil to a constant voltage during the halt period.
摘要:
There is provided an information processing system including a service provider unit, a communication terminal and an information processing unit. The communication terminal includes a terminal first communication section, a terminal second communication section to communicate with the information processing unit through a first communication channel, a terminal third communication section to communicate with the information processing unit through a second communication channel, and a terminal communication control section. The information processing unit includes a unit first communication section to communicate with the communication terminal through the first communication channel, a unit second communication section to communicate with the communication terminal through the second communication channel, a unit communication control section to switch communication channels with the communication terminal from the first communication channel to the second communication channel, and a unit processing section to perform service processing with the service provider unit.
摘要:
There is provided a communication apparatus including: a first communication unit having a first communication range; a second communication unit having a second communication range wider than the first communication range; a control unit which transmits a request signal for starting communication via the second communication unit from the first communication unit to another communication apparatus, and transmits authentication information from the second communication unit to the another communication apparatus in the case where it is determined that communication with the another communication apparatus via the second communication unit is possible based on a response signal after the first communication unit receives the response signal in response to the request signal; and a notification unit which notifies a user after the second communication unit receives a result of authentication based on the authentication information.
摘要:
An information processing device has a first transmitting unit to connect a first other information processing device and second other information processing device and transmit the content via the connection; a first receiving unit to receive a master request that requests an upgrade to a master from the first other information processing device; a second transmitting unit to transmit the identification information of the first other information processing device to the second information processing device upon receiving the master request; a disconnecting unit to disconnect the connection with the second other information processing device after transmitting the identification information of the first other information processing device; and a second receiving unit to receive content via the connection from the first other information processing device.
摘要:
Ethanol is prepared with high selectivity by the catalytic reaction of carbon monoxide and hydrogen. The catalyst composition comprises:(A) catalyst component consisting of(a) a rhodium component,(b) a lithium component, and(c) a component of at least one element selected from the group consisting of iridium, manganese, scandium, mangesium, yttrium, ytterbium, lutecium, vanadium and chromium; and(B) catalyst component, which is supported on a separate carrier from said (A) catalyst component, being selected from the group consisting of(a) an iron component and a component of at least one element selected from the group consisting of iridium and palladium,(b) a molybdenum component and a component of at least one element selected from the group consisting of iridium and palladium,(c) an iron component, a molybdenum component and a component of at least one element selected from the group consisting of iridium and palladium, and(d) a copper component and optionally a component of at least one element selected from the group consisting of zinc and chromium.