42results about How to "Fast start" patented technology

Problems with accuracy reading position detection signal peaks and minute phase differences in the detection current make motor drive control easily susceptible to differences in motor characteristics. The rotor position is determined based on whether or not a neutral point difference voltage, which is the difference voltage between the neutral point voltage and the pseudo-neutral-point voltage when the motor phases are selectively energized, exceeds a specific threshold value. The phase energized to start the motor is determined based on this determination and the motor is energized accordingly to start. Instead of switching directly from the search step at the initial rotor position to the back-EMF voltage mode, a search and start mode that creates initial rotor speed sufficient to start the motor is executed before entering the back-EMF voltage mode.

A motor driving method is provided. A rotor position is determined based on whether or not a neutral point voltage difference, or a voltage difference between neutral point voltage and pseudo neutral point voltage exceeds a predetermined threshold when an energization phase is sequentially selected and energized. The energization phase for starting a motor is determined based on the result of this determination, and the motor is energized and started according to the determined energization phase. The operation mode is not changed directly from a step for searching the initial position of the rotor to a counter electromotive voltage mode. Instead, a search start mode for supplying appropriate rotational speed to the initial startup of the motor is once established, and then the mode is changed to the counter electromotive voltage mode. Following problems are solved: a problem of the correctness of a peak value of a position detection signal taken in; a problem of proneness to be influenced by a variation in motor characteristics caused by the slightness of differences in detection currents between phases; and a problem that methods of comparing voltage differences determined with respect to each group of measured voltages that occurs at a neutral point of motor windings each time a detection signal is applied to determine a large voltage difference require a reference table and high computing power.

The invention discloses a method of asynchronously starting an electrically-excited synchronous motor by a frequency converter. The method comprises steps: (1) a starting signal is sent; (2) rotation speed information is tracked and the frequency converter drives the motor to operate; (3) the actual motor operation rotation speed and the operation frequency are acquired, and whether the operation frequency at the time is larger than an exciting frequency point setting value is judged; (4) asynchronous operation to the exciting frequency point setting value is carried out; (5) stable operation is carried out to wait for exciting; (6) excitation is put in; (7) whether exciting succeeds or not is judged, in the case of success, a step (9) is executed, or otherwise, a step (8) is executed; (8) preparation is made for following re-operation of the frequency converter and the exciting of the motor; and (9) the motor enters a synchronous state, and at the time, the frequency converter drives the motor to synchronously operate to the frequency set by the frequency converter and stabilized to a set frequency, and other speed regulation instructions is waited. The method of the invention has the advantages that the principle is simple; synchronous starting can be quickly realized; and the controllability and the reliability are good.

Provided are a charge controlling agent comprising, as the active ingredient, a metal compound of a cyclic phenol sulfide represented by the general formula (1) (wherein at least one of a plural number of Y's is a metal atom), and a toner comprising at least one kind of the above-described compound together with a coloring agent and a binder resin. This charge controlling agent overcomes the problems of less clearness in the early printed images and fluctuation in printed image qualities during continuous printing, shows a good charge rise which makes it applicable to high-speed printers employed in recent years, has an excellent environmental stability with little change in charge amount depending on a change in temperature or humidity, and has a large frictional charge amount. By using this charge controlling agent, a negatively charged toner having a high charge performance can be provided.

The invention discloses a heat energy device for preparing superheated steam with waste heat steam, which effectively solves the problem that conventional heat sources for drying brown coal are uneconomic and have the hidden troubles of ignition and explosion. The device comprises a partition wall, a base, a heat exchange part, an upper independent smoke box, a lower independent smoke box and upper and lower integrated smoke boxes. Key points are that: the heat exchange part is provided with a low temperature heat exchange region, a medium temperature heat exchange region and a high temperature heat exchange region which are formed by a tube bundle heat medium exchanger respectively; tube cavities of the tube bundle heat medium exchangers at each heat exchange region are communicated withthe cavities of the upper independent smoke box, the lower independent smoke box and the upper and lower integrated smoke boxes respectively; staggered tube gaps between an upper tube plate and a lower tube plate of each tube bundle heat medium exchanger at the heat exchange part form a communicated cavity; the communicated cavity of the low temperature heat exchange region is connected with a waste heat steam conveying tube; and the communicated cavity of the high temperature heat exchange region is connected with a superheated steam supply tube. The device has the characteristics of rational structural design, stable performance, easy maintenance, low operating cost, energy conservation, consumption reduction, emission reduction and wide application range and can reduce the one-time investment when used for drying the brown coal.

An aerodynamic shoe technology solution that greatly increases the stride speed without external mechanical power at all. This technical solution uses a special sole, shoe body and aerodynamic ball structure to convert the gravitational energy of the foot landing when the human body is moving into the power that pushes the human body forward, reducing the vibration of the human foot when the human body is on the ground to the greatest extent, and has the function of reducing The positive effect of human body exercise physical energy consumption, increase of body jumping height, and acceleration of human body movement speed plays a role in reducing shock, protecting the body, raising the body, strengthening the body, and improving sports performance. The technical solution is simple to implement and easy to manufacture, and the formed product is no different from ordinary shoes, beautiful and elegant, solid and durable, safe and reliable in use, free to control, almost not restricted by topography and road environment, and can be used in daily life, sports competitions, etc. , military sports and other aspects have a wide range of application prospects, the market space is extremely broad, and has extremely high added value and market potential.

The invention discloses a gas turbine starting control system and method, the gas turbine starting control system includes a gas turbine generator and a control system, the control system is connected with the gas turbine generator; the gas turbine generator is used to generate gas; the The control system includes a start controller and several temperature acquisition units; the temperature acquisition unit is used to collect several temperature parameter data of the gas turbine, and transmit the temperature parameter data to the start controller; the start control The controller is connected to the gas turbine generator; the starting controller generates a control instruction based on the temperature parameter data, and transmits the control instruction to the gas turbine generator to control the gas turbine generator. The invention can increase the starting speed of the gas turbine by dynamically adjusting the oil supply amount and the current of the starting motor under the condition of not exceeding the temperature and limiting the current.

The invention discloses a braking kinetic energy regenerating hydraulic retarder for an automobile. The hydraulic retarder is an oil pump and hydraulic system arranged on power takeoff windows for gearboxes of large and medium automobiles. The hydraulic retarder not only has functions of the hydraulic retarder for the automobile, but also can recycle kinetic energy to be abandoned when the automobile brakes. The hydraulic retarder is characterized in that: the hydraulic retarder is connected in parallel with main transmission of the automobile, so the hydraulic retarder is convenient to jointand separate; remarkable energy-saving effect is achieved; energy is released and more force is applied when a vehicle is started, so the working condition of an engine is improved and the emission of harmful gas is reduced; starting speed can be increased and running efficiency is improved; mechanical rigid braking is replaced by flexible hydraulic retarding, so riding comfort is improved, the service lives of vehicle braking and a braking system are prolonged, and the safety performance of the vehicle is enhanced; and conventional mature hydraulic technology and hydraulic components produced in a large scale are adopted, so the system is simple and reliable, has low manufacturing cost, and is easy to popularize and apply.