31results about How to "Increase the maximum speed" patented technology

A motor driving apparatus includes an inverter circuit for converting an output voltage of a power supply into a three-phase AC and outputting the same to the brushless motor, a rotor position estimation unit for estimating a rotor position of the brushless motor, and an inverter control unit for controlling the inverter circuit so that the brushless motor is driven by a current based on the estimated rotor position. The inverter control unit determines an advance angle of the current supplied to the brushless motor with respect to the estimated rotor position so as to minimize a deviation between a command rpm and an actual rpm. Therefore, it is possible to perform stable weak field control for the brushless motor, independently from the input voltage of the inverter circuit, without using predetermined control variables such as table values.

The invention discloses a comprehensive test stand for water-lubricated bearings for pumps. The comprehensive test stand comprises a driving transmission system, a main box, a bearing, a lubricating system, a loading system, a measuring system, a signal analyzing and processing system and the like, the driving transmission system consists of a variable-frequency motor, an elastic coupler, a step-up box and the like, the main box is a cube with a transparent top cover plate, and a spindle horizontally enters the box from a side wall, which is close to the end of the elastic coupler, of the main box. A pressure sensor, an eddy current sensor, a vibration acceleration sensor, a temperature sensor and the like are sequentially arranged and mounted on the spindle or around the spindle and used for acquiring displacement signals, rotation speed signals, phase signals, temperature signals, pressure signals, vibration signals and the like, and the sensed signals which are acquired by the various sensors in an online manner are transmitted to an upper computer to be processed, displayed and stored. The comprehensive test stand has the unique advantages of fine performance, high precision, low cost, environmental protection, zero pollution, friction reduction, energy conservation, noise and vibration reduction, fine fire resistance, easiness in maintenance and the like.

The invention discloses an electric automobile transmission and a speed change method of the electric automobile transmission. The electric automobile transmission comprises a hydraulic torque converter with the locking function, a planet gear mechanism, an oil pump, an oil pump motor, a controller, a speed reducing mechanism and a differential mechanism. The hydraulic torque converter with the locking function comprises a pump impeller, a turbine, an input shaft, an output shaft and other components. A driving motor is connected with the pump impeller through the input shaft, and the turbine is connected with the output shaft. The torque of the output shaft is transmitted to the planet gear mechanism. The planet gear mechanism comprises a sun gear, a planet carrier, a big gear ring, a clutch, a brake and other components. Torque is output from the planet carrier through the planet gear mechanism and drives an automobile to run after passing through the speed reducing mechanism and the differential mechanism. The transmission can have two mechanical transmission gears and one hydraulic torque conversion gear. The oil pump is used for providing pressure for a hydraulic system of the transmission. Due to the electric automobile transmission, the climbing performance and the acceleration performance of the electric automobile can be improved, and the reliability of the automobile can be enhanced.

A method for detecting the position of a rotor of a DC motor with N phases having a plurality of windings, comprising the steps of connecting two of the windings between first and second prefixed voltages through to a first current path for a prefixed time, allowing the current stored in the two windings to discharge through a second current path; comparing the voltage across one of the two windings with a reference voltage and providing a control signal when the voltage is smaller in absolute value than the reference voltage, performing the above steps for each of the winding pairs of the motor; detecting the position of the rotor on the basis of the control signals obtained.

The invention is complex high performance quintuple body ship with a rotative object. Its feature is that the rotative accessories which rotate around the axis perpendicular to the longitudinal section of the middle of the ship are installed under the bow of central body and behind the two propulsion device at the tail by support stand. The shafts of the three accessories all linked with energy converting device. It solves the problem that twin-hull ship (boat) or small (or middle sized) twin-hull boat is limited by the large torque both longitudinally and transversely which rationally reduced the weight of the structure above the waterline base on the premise that no speed, wave tolerance, sailing adaption and intensity loss. At the same time the inventions makes use of the energy from the wave at the bow and recycle the energy of the wake from the propulsion device to supply the light, canal, emergency equipment and other subordinate aspects to save the energy.

The invention discloses a multistage serial-parallel conversion circuit, which is characterized by comprising at least three stages of D trigger groups. The first stage of D trigger groups comprises n cascaded D triggers with the same first clock signals; the second stage of D trigger groups comprises n*m cascaded D triggers with the same second clock signals; the third stage of D trigger groups comprises n*m cascaded D triggers with the same third clock signals; in the first stage of D trigger groups, the output end of the ath D trigger is connected with the input end of the ath D trigger in the second stage of D trigger groups; the output end of the ((m-1)*n+a)th D trigger in the second stage of D trigger groups is connected with the input end of the (m*n+a)th D trigger in the second stage of D trigger groups and is also connected with the input end of the ((m-1)*n+a)th D trigger in the third stage of D trigger groups; and n, m and a are all natural numbers, and a</=n.

The invention discloses a permanent magnet motor and a compressor. The permanent magnet motor comprises a stator and a rotor. The stator comprises a stator core, a plurality of coil groups, and two motor lead groups. Each coil group comprises a plurality of coils which are coiled on stator bulging teeth. Each coil group comprises an incoming line terminal and a leading-out terminal formed by joints in the same number. Each motor lead group has a plurality of joints used to connect with the coil groups, and a motor lead of a motor control circuit. An inverter with a control algorithm provides power input for the permanent magnet motor. An effective value Um of maximum voltage between terminals, provided to the permanent magnet motor by the inverter, and no-load back EMF ke value between motor line terminals satisfy 4<=Um/ke<=56, wherein unit of Um is volt, unit of ke is volt/thousand round per minute. The permanent magnet motor can also satisfy torque output capacity of a motor in high-frequency.

The invention discloses a high-strength washing machine high-speed motor bearing and relates to the field of bearings. The high-strength washing machine high-speed motor bearing comprises a bearing body. The bearing body is sequentially provided with an outer ring, a rolling body, a retainer, a first inner ring, a second inner ring and an inner shaft sleeve from outside to inside. The first inner ring and the second inner ring are arranged side by side. The rolling body comprises a first cylindrical roller arranged on the outer side of the first inner ring, a second cylindrical roller arranged on the outer side of the second inner ring, a first rolling ball arranged on the inner side of the first inner ring and a second rolling ball arranged on the inner side of the second inner ring. A fastening portion is arranged on the outer side of the inner shaft sleeve. The fastening portion is used for fixing the first inner ring and the second inner ring. The inner side of the inner shaft sleeve is provided with a toothed groove which is used for fixing the bearing body to a rotating shaft. By means of the design that the rolling balls are combined with the cylindrical rollers, the effect of increasing the load of the bearing is well achieved, the largest rotating speed of the bearing can be greatly improved due to the design of a good lubricating system and a nylon retainer, the service life of the bearing is prolonged, and the requirement for the high-strength and high-speed bearing of a washing machine is met.

The invention relates to a CO2 energy power generation system technology with clean afterburning and multielement heat exchange of heat engine exhaust smoke. On the basis of original innovation of combustion science of the patent ZL201220566497.4 invented by the inventor, energy conservation and environment protection of appearing and hiding waste heat losses of heat engine exhaust smoke and CO2,SO2, NO and NO2 acid gas pollution need flue gas treatment, the technology is provided with an afterburning hearth furnace combustion CO2, three-array heat exchange unit and steam turbine cycle powergeneration system with heat engine exhaust smoke CO2 energy, (a steam turbine exhaust condensing system, a heat engine exhaust smoke, a low-temperature element array, a magnesium-catalyzing afterburning hearth furnace, a high temperature element array, waste heat low-temperature element array and a variable-frequency induced draught fan) and steam turbine combined cycle power generation by takinga afterburning hearth furnace as a center.

The invention relates to general machinery, in particular to a high-pressure pump. The pump comprises a pump head and a barrel-shaped pump body. The pump head is connected with the pump body, and thebarrel bottom of the pump body faces the pump head. Piston rods are evenly distributed at the barrel bottom of the pump body in the circumferential direction of the barrel bottom and arranged in the axial direction of the pump body. The two ends of each piston rod stretch out of the two sides of the barrel bottom of the pump body respectively, the piston rods are in sliding sealing fit with the pump body, and the portions, located outside the pump body, of one ends of the piston rods are connected with the pump head. The pump is characterized in that a rotating shaft is concentrically arrangedin the pump body, the rotating shaft is matched with the pump body in a rotating mode, a swash plate is fixed to the rotating shaft, notches are formed in the sections, located in the pump body, of the the inner side walls of the piston rods, the piston rods are clamped to the swash plate through the notches, and gaps are formed between the outer edge of the swash plate and the bottoms of the notches. Ball heads are arranged on the portions, in the notches, of the two end faces of the swash plate. Flat plates are arranged on the sides, corresponding to the ball heads, of the swash plate and abut against the swash plate. The high-pressure pump is long in service life and high in water pumping pressure.

The invention provides an analog decision feedback equalization (DFE) circuit for a high-speed SerDes, which comprises a delay unit, a multiplier and a coefficient update circuit, wherein the coefficient update circuit generates a coefficient by means of a symbolic LMS algorithm. The analog decision feedback equalization circuit is characterized in that the delay unit and the multiplier are an analog delay unit and an analog multiplier respectively, and the delay of a signal is realized through the analog delay unit; the multiplication of the coefficient and an output signal of the analog delay unit is realized through the analog multiplier; and the output of the analog multiplier is realized through current summing. The analog DFE circuit for the high-speed SerDes realizes functions of the DFE circuit through the analog multiplier and the analog delay unit, improves the highest rate and speed capable of being supported by the circuit and can reduce the area at the same time.