Kabushiki Kaisha Toshiba

Victor Company of Japan, Limited

Minoru Matsuda

Natsuku Hoshino

Nobuo Okita

Hiroshi Iwai

Masataka Kikuchi

Kouichi Kitaguchi

Battery for camcoder

Turbine nozzles and turbine moving blades of an axial-flow turbine are provided which are capable of reducing a secondary flow loss with a simple structure. A nozzle blade passage formed by nozzle blades, an outer diaphragm ring and an inner diaphragm ring is structured in such a manner that the shapes of inner and outer walls of the nozzle blades are made to be irregular so that stepped portions (h at the root and h at the tip) each having curvature R are formed. The nozzle blades are formed in such a manner that ends (Zr, Zp and Zt) of an trailing edge of the nozzle blades are positioned at the most downstream position at the central portion of the nozzle blades. Moreover, relationships Zt<Zr<Zp are satisfied. Similarly to the nozzle blade passage, the moving blades are formed in such a manner that stepped portions h and h each having curvature R are formed in the moving blade passage. The central portion of the lengthwise direction of the moving blades is made to be lower than a straight line connecting an trailing edge of the root and an trailing edge of the tip to each other. Thus a moving blade passage is formed in which the distance from the line connecting the trailing edge and the outer surface of the trailing edge is a maximum length.

Turbine nozzle and moving blade of axial-flow turbine

A steam turbine comprises, in combination, at least two of a high pressure turbine section, an intermediate pressure turbine section and a low pressure turbine section in a single turbine casing and the steam turbine generally satisfies such design requirements as: a main steam pressure of 100 kg/cm,or more; a main steam temperature of 500&deg; C. or more; a rated output (power) of 100 MW or more; and a unit rotated at a rotation speed of 3,000 rpm equipped with a last-stage movable blade of the turbine having an effective blade length of 36 inches or more, or a unit rotated at a rotation speed of 3,600 rpm equipped with a last-stage movable blade of the turbine having an effective blade length of 33.5 inches or more. In such steam turbine, a turbine exhaust chamber of the low pressure turbine section has a structure extending towards both sides of a transverse direction of the turbine casing, towards the upper side thereof or in the axial direction thereof.

Steam turbine

Turbine nozzles and turbine moving blades of an axial-flow turbine are provided which are capable of reducing a secondary flow loss with a simple structure. A nozzle blade passage formed by nozzle blades, an outer diaphragm ring and an inner diaphragm ring is structured in such a manner that the shapes of inner and outer walls of the nozzle blades are made to be irregular so that stepped portions (h1 at the root and h2 at the tip) each having curvature R are formed. The nozzle blades are formed in such a manner that ends (Zr, Zp and Zt) of a trailing edge of the nozzle blades are positioned at the most downstream position at the central portion of the nozzle blades. Moreover, relationships Zt&lt;Zr&lt;Zp are satisfied. Similarly to the nozzle blade passage, the moving blades are formed in such a manner that stepped portions h3 and h4 each having curvature R are formed in the moving blade passage. The central portion of the lengthwise direction of the moving blades is made to be lower than a straight line connecting a trailing edge of the root and a trailing edge of the tip to each other. Thus a moving blade passage is formed in which the distance from the line connecting the trailing edge and the outer surface of the trailing edge is a maximum length.

A multi-phase brushless motor including a stator having a plurality of drive coils each corresponding to a specific phase and a rotor having a plurality of field magnet poles of successively alternating polarity. The stator further has a plurality of Hall generators for detecting the positions of the rotor and a speed sensor for detecting the rotational speed of the rotor. The brushless motor is driven by a drive circuit which supplies drive currents to the drive coils of the stator so as to generate torques. The drive circuit is operated under control of a control circuit which comprises a first processing circuit responsive to position signals from the Hall generators to output exciting signals to the drive circuit so that the drive circuit supplies the drive currents to the drive coils thereof and a second processing circuit responsive to the speed signal from the speed sensor and the position signal to output exciting signals to the drive circuit which in turn supplies the drive currents thereto. The first and second processing circuits are selectively operated such that the first processing circuit outputs the exciting signals to the drive circuit at startup of the motor and the second processing circuit outputs the exciting signals thereto after the startup.

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Yokohama, Japan

Minoru Matsuda