Abstract: A control apparatus controls a voltage applied to an AC motor from a power converter with a PWM signal, and has two different magnetic pole position-estimating units which estimate a rotor magnetic pole position of the AC motor, and has a switching unit which selects any one of these two kinds of magnetic pole position-estimating units.

Abstract: A catheter for artificial insemination which is a hollow cylindrical catheter having open ends at both ends, the catheter comprising a small diameter portion forming a distal end portion, a large diameter portion forming a proximal end portion and a tapered portion connecting the small diameter portion and the large diameter portion, a total inner volume of the catheter being from 0.2 to 1.0 ml.

Abstract: A latch up in a charge pump device is prevented as well as a withstand voltage of an MOS transistor used in the charge pump device is increased with this invention. A first and a second N-type epitaxial silicon layers are stacked on a P-type single crystalline silicon substrate, and P-type well regions are formed in the second epitaxial silicon layer separated from each other. A P-type isolation layer is formed between the P-type well regions. A P+-type buried layer is formed abutting on a bottom of each of the well regions, an N+-type buried layer is formed abutting on a bottom of the P+-type buried layer, and a transistor for charge transfer is formed in each of the P-type well regions.

Abstract: In a charge pump device, occurrence of a latch up can be prevented and current capacity can be increased. An N-type epitaxial silicon layer is formed on a P-type single crystalline silicon substrate, P-type well regions are formed in the N-type epitaxial silicon layer separated from each other, and P-type lower isolation layers and P-type upper isolation layers are formed between the P-type well regions. Then a charge transfer MOS transistor is formed in each of the P-type well regions. The P-type single crystalline silicon substrate is biased to a ground potential or a negative potential.

Abstract: A semiconductor device for a charge pump device suitable for providing large current capacity and preventing a latch up from occurring is offered. A first and a second N-type epitaxial silicon layers are stacked on a P-type single crystalline silicon substrate, and P-type well regions are formed in the second epitaxial silicon layer. P+-type buried layers abutting on bottoms of the P-type well regions and N+-type buried layers abutting on bottoms of the P+-type buried layers and electrically isolating the P-type well regions from the single crystalline silicon substrate are formed. An MOS transistor is formed in each of the P-type well regions and a drain layer of the MOS transistor and each of the P-type well regions are electrically connected.

Abstract: A semiconductor device for a charge pump device suitable for providing large current capacity and preventing a latch up from occurring is offered. An N-type epitaxial silicon layer is formed on a P-type single crystalline silicon substrate, and a P-type well region is formed in the N-type epitaxial silicon layer. A P+-type buried layer abutting on a bottom of the P-type well region and an N+-type buried layer partially overlapping with the P+-type buried layer and electrically isolating the P-type well region from the single crystalline silicon substrate are formed. And then, an MOS transistor is formed in the P-type well region.

Abstract: A semiconductor device for a charge pump device suitable for providing large current capacity and preventing a latch up from occurring is offered. A first and a second N-type epitaxial silicon layers are stacked on a P-type single crystalline silicon substrate, and a P-type well region is formed in the second epitaxial silicon layer. A P+-type buried layer is formed abutting on a bottom of the P-type well region, and an MOS transistor is formed in the P-type well region. The MOS transistor has a first source layer N+S of high impurity concentration, a first drain layer N+D of high impurity concentration and a second source layer N−S and/or a second drain layer N−D of low impurity concentration, which is diffused deeper than the first source layer N+S of high impurity concentration and the first drain layer N+D of high impurity concentration.

Abstract: A medium for cultivating an animal embryo that is capable of readily culturing a fertilized ovum can be provided. A cultivation medium is separated into two parts, i.e., one is a neutral aqueous solution and the other is an acidic aqueous solution. The two parts are mixed before use. The neutral aqueous solution contains a nutrient such as lactic acid or a lactic salt and another inorganic component and an indicator that indicates a state of a development environment with its color, and the acidic aqueous solution contains a nutrient such as pyruvic acid and an antibiotic. The pH change in the medium according to cultivation of animal embryo can be determined by the change of the color of the indicator.

Abstract: In an arrangement having an electric power inverter 2 which applies a voltage to an AC motor 1 and a control unit 4 which calculates a voltage command value applied in PWM signals, detection use voltages Vup, Vvp and Vwp are applied in synchronism with PWM signal generation use carrier waves in the control unit 4 as well as motor currents iv and iv are detected in response to current detection pulses Pd in synchronism therewith. In a magnetic pole position detection unit 12, counter electromotive forces of the synchronous motor 1 are estimated from a relationship between the detection use voltages Vup, Vvp and Vwp and current difference vectors of the motor current to determine a magnetic pole position &thgr; through calculation. The determined magnetic pole position &thgr; is inputted to coordinate conversion units 8 and 11 and a motor speed detection unit 13.

Abstract: Efficacious remedies for male sterility which are in the form of preparations containing as the active ingredient an adenosine A1 antagonist.

Abstract: In order to propose an inexpensive and highly precise motor controller, it is structured so as to detect the position of the rotor on the basis of the difference between the real current differential vector and the reference current differential vector, thereby control the motor without using a rotation position sensor.

Abstract: In order to propose an inexpensive and highly precise motor controller, it is structured so as to detect the position of the rotor on the basis of the difference between the real current differential vector and the reference current differential vector, thereby control the motor without using a rotation position sensor.

Abstract: A digital calculation apparatus 4 including a position-detection means 14 for detecting the magnetic pole position, based on the detected current difference values of the synchronous motor 1 in a two-phase short-circuit state, takes in current flowing in the synchronous motor by generating an interruption trigger signal in synchronization with the PWM signals for driving an inverter 3, and driving an A/D converter with the generated trigger signal.

Abstract: A control apparatus controls a voltage applied to an AC motor from a power converter with a PWM signal, and has two different magnetic pole position-estimating units which estimate a rotor magnetic pole position of the AC motor, and has a switching unit which selects any one of these two kinds of magnetic pole position-estimating units.

Abstract: A synchronous motor control system includes a synchronous motor 1, an inverter 3 and a controller 4 wherein a current differential detecting unit 13 detects a variation of a motor current when the three phases of the motor 1 is short circuited by the inverter 3, namely at the moment when a carrier wave in a PWM signal generator 9 assumes maximum or minimum value, in a calculating unit 14 a phase &ggr; from &agr; axis of a stationary coordinate system to a three phase short circuited current differential vector is calculated, a phase &dgr; is estimated from d axis to the three phase short circuited current differential vector by making use of d axis current id and q axis current iq on d-q axes coordinate system in the controller 4, thereafter the magnetic pole position &thgr; with respect to &agr; axis is calculated from the phases &ggr; and &dgr;, based on thus calculated magnetic pole position &thgr;, d-q axes control units 11, 7 and 8 are constituted to control the synchronous motor, thereby a highly reliab

Abstract: A synchronous motor controlling apparatus which can be applied to the carrier synchronized position estimating method as well and have protection-related functions such as detection of inverted magnetic pole position of a motor in a simple method, and an electric motor using the synchronous motor control apparatus. A controller controls a voltage applied to an AC motor with a PWM signal. A magnetic pole position detector of the controller detects a current of the AC motor to estimate a pole position of the AC motor. A fault detector detects a fault in the estimated magnetic position of the AC motor.

Abstract: A connector fitting detection construction in which even if dirt, dust or the like is deposited on contacts, the contacts can be positively electrically connected together, thereby enhancing the reliability of a fitting detection function. In the connector fitting detection construction for detecting a fitted condition of a pair of connectors, a cantilever-like lock arm is provided on one connector housing, and the lock arm can be elastically flexed so that its free end can be moved in a direction generally perpendicular to a connector fitting direction. A short-circuiting electrode of a U-shape, having contact portions provided respectively on outer sides of pair of legs, is mounted on the lock arm, with the pair of legs disposed respectively on opposite sides of the lock arm.

Abstract: A tube for sperm washing and concentration. The tube is a glass tube 1 having an open end 11 and a bottom portion with a small diameter 12, and an elastic bladder 2 removably provided at the open end 11 of the tube 1. A vulnerable section 13 may be further provided to enable the bottom with small diameter 12 to be easily bent and cut. Contamination of the sperm by bacteria and remaining density gradient carrier are not caused.

Abstract: A vehicle provided with an engine 1 which generates a driving energy for the vehicle, planetary gears 4 and 6 comprising sun gears, planet gears and ring gears, motors 8 and 9 for respectively controlling the sun gears, and a clutch 14, the planet gears being connected to an input shaft driven by the engine and the ring gears connected to an output shaft for driving wheels, wherein gear ratios from the input shafts to the output shafts in the planetary gears 4 and 6 are set at a value different to each other. A stepless speed changing function which permits vehicular operation in a high engine efficiency region while minimizing an electrical energy loss is realized by a small-sized transmission using small-sized motors. The vehicle, which uses the transmission, can be operated in a high engine efficiency region while keeping an electrical energy loss to a minimum.

Abstract: A synchronous motor control system includes a synchronous motor 1, an inverter 3 and a controller 4 wherein a current differential detecting unit 13 detects a variation of a motor current when the three phases of the motor 1 is short circuited by the inverter 3, namely at the moment when a carrier wave in a PWM signal generator 9 assumes maximum or minimum value, in a calculating unit 14 a phase &ggr; from &agr; axis of a stationary coordinate system to a three phase short circuited current differential vector is calculated, a phase &dgr; is estimated from d axis to the three phase short circuited current differential vector by making use of d axis current id and q axis current iq on d-q axes coordinate system in the controller 4, thereafter the magnetic pole position &thgr; with respect to &agr; axis is calculated from the phases &ggr; and &dgr;, based on thus calculated magnetic pole position &thgr;, d-q axes control units 11, 7 and 8 are constituted to control the synchronous motor, thereby a highly reliab