摘要:
A control apparatus for an AC motor controls an inverter in a pulse width modulation scheme to feed a coil current to a stator coil of a stator. A pattern switching mechanism switches a control pattern to a first pattern or to a second pattern; a first pattern calculating mechanism calculates a control signal using a first pattern parameter; a second pattern calculating mechanism calculates a control signal using a second pattern parameter; an offset calculating mechanism calculates a difference between a control signal of an old pattern and a control signal of a new pattern, and reflects the offset amount on the control signals; and a control output mechanism calculates a final control output signal on the basis of the control signals, and transmits the final control output signal to the inverter.
摘要:
To provide a flowmeter producing stable measurement results and coincidentally achieving miniaturization, a bent portion is provided in a flow path located between an inlet port of fluids to the flowmeter and a second flow path at which a sensor detecting a flow rate is positioned, thus forming at a sensor an almost uniform flow-velocity distribution in cross-section of the fluids and a reproducible and constant flow-velocity distribution.
摘要:
An air suction passage (4A, 4B) is provided with a pick and place confirming sensor (1) comprising a gas flow sensor. The pick and place confirming sensor (1) measures the flow rate of air sucked in from an air suction port (33) of a pick and place nozzle (2). The presence or absence of a part lifted to the pick and place nozzle (2) is detected on the basis of the measurement result.
摘要:
A path detector constructed so that a path block body (10) forming a given path (11) and having a flow sensor (13) interposed in the path (11) and a circuit board (4) surmounted by an electric circuit are accommodated in a rectangular parallelepiped or cubic housing (1). There are provided an indicator (6) and an operation switch (7) in the front surface portion of the housing (1) that is exposed to the front surface of a given panel when fixed to the panel. A U-shaped path is so formed as to have an inlet (2) and an outlet (3) in the back surface portion of the housing (1). A terminal for external connection (5) of the circuit board (4) is disposed in the back surface portion of the housing (1).
摘要:
A flow control valve comprising a main valve for opening and closing a fluid conduit, an electromagnetic coil for driving the main valve, a diaphragm responsive to the action of the main valve, a sub-valve chamber partitioned by the main valve and the diaphragm, a sub-valve incorporated in the main valve for opening and closing the sub-valve chamber to a conduit in the secondary side, a projection, protrusively formed on a driving shaft of the electromagnetic coil, responsive to a driving force of the electromagnetic coil for sliding the sub-valve by a predetermined stroke to bring the same in a fully opened state with the main valve remaining in a closed state and thereafter opening the main valve, a bleed orifice provided through a side wall of the main valve for making the pressure in the sub-valve chamber equal to a primary pressure; and a returning spring for urging each of the main valve and the sub-valve in the closing direction.
摘要:
To provide a flow meter, and a flow volume controlling device equipped therewith, capable of reducing pressure loss while obtaining a flow rectifying effect in a measurement fluid. A flow meter for measuring the flow volume of a measurement fluid, equipped with a flow path wherein the measuring fluid flows, and a flow rectifier that is disposed within the flow path, where the flow rectifier has holes for rectifying the flow of a measurement fluid, and has an area that is wider than the flow path cross-sectional area in a direction that is perpendicular to the direction in which the flow path extends. The flow volume controlling device is provided with the flow meter, a controlling valve, and controlling means for adjusting the flow volume of a fluid that flows through the flow path of the flow meter through controlling the controlling valves based on information regarding the flow volume detected by the flow meter.
摘要:
To provide a flowmeter producing stable measurement results and coincidentally achieving miniaturization, a bent portion is provided in a flow path located between an inlet port of fluids to the flowmeter and a second flow path at which a sensor detecting a flow rate is positioned, thus forming at a sensor an almost uniform flow-velocity distribution in cross-section of the fluids and a reproducible and constant flow-velocity distribution.
摘要:
An air suction passage (4A, 4B) is provided with a pick and place confirming sensor (1) comprising a gas flow sensor. The pick and place confirming sensor (1) measures the flow rate of air sucked in from an air suction port (33) of a pick and place nozzle (2). The presence or absence of a part lifted to the pick and place nozzle (2) is detected on the basis of the measurement result.
摘要:
In order to make an electric motor smooth in drive with improving the electric consumption efficiency, the over heat of a motor driver and vibrations thereat are restricted which result from chopping energization of the electric motor.
摘要:
A motor driving control device that achieves as high as possible phase coil energization level while preventing thermal destruction of the power switching element by using precise thermal detection of a portion of the power switching element inside a switching module of the control device. An electric power loss Lt at the switching element is used for calculating a saturation temperature Tjgoal. On the basis of the saturation temperature, Tjgoal, and a time constant &tgr; of temperature rise, an instant junction temperature Tjnow is calculated. A difference Error between the instant junction temperature Tjnow and an upper temperature limit value Tjmax is calculated. In a motor locked condition, a coefficient Kt is calculated for the target torque, the target torque being equal to the required torque multiplied by Kt. Kt is based on the Error for calculating the target torque. If Error is greater than or equal to a predetermined value, K3, Kt is set to be 1, even if Kt is in excess of 1. If Error is less than or equal to 0 , Kt is set to be zero.