30results about How to "Achieve a smooth start" patented technology

The invention provides an integrated hub motor and a control method thereof. The integrated hub motor comprises a motor shaft and a stator fixed on the motor shaft, wherein the stator is externally sheathed with a rotor casing; the front end and the rear end of the rotor casing are rotatablely fixed on the motor shaft by a rotor end cover and a bearing; two ends of the motor shaft protrude outside the rotor end cover to form a long end and a short end; a bearing end cover is fixed at the outer side of the rotor end cover; and the short end of the motor shaft is covered therein. The invention is characterized in that a bearing end cover shaft is arranged in the middle part of the bearing end cover in a protruding mode towards the direction of the motor shaft, and a position detection device is arranged at the corresponding position of the end part of the motor shaft and the bearing end cover shaft; the motor shaft is sheathed with a servo controller; and the position detection device senses rotation of the bearing end cover shaft and transmits the sensed signal to the servo controller to finally obtain the rotating angle or position of the rotor after being processed by the servo controller, thus achieving accurate control of the motor. The invention has the advantages of simple structure, energy conservation, good starting characteristic, small volume and high efficiency.

The invention provides a method for providing given frequency in a motor starting phase. The method is characterized by at least comprising a beginning phase and an ending phase in the starting process of the motor; in the beginning phase, the given frequency is provided at continuously-increasing acceleration, the given frequency and the acceleration of the given frequency are zero at the beginning of the beginning phase; in the ending phase, the given frequency is provided at the continuously-decreased acceleration; and the given frequency is increased to target frequency and the acceleration of the given frequency is decreased to zero in the end of the ending phase. In the invention, the starting phase of the motor is divided into the beginning phase and the ending phase, the accelerations of the given frequency are zero when the beginning phase is started and the ending phase is ended, the problem that an electric fence generates the impact by using the traditional linear acceleration method due to the mutation of the acceleration can be solved, the smooth starting of the motor can be realized, the starting current can be reduced, the starting overcurrent tripping can be avoided and thereby the performance of the motor can be fully exerted.

The invention provides a hill starting sliding prevention control method and device and electronic equipment and relates to the technical field of automobile starting control. The hill starting sliding prevention control method comprises the steps of calculating a gradient desired torque and a driver desired torque which overcome gradient resistance when detecting that a vehicle carries out hill starting and an automatic hold AVH function of an electronic stability program ESP is started; transmitting a torque output instruction to a power system according to the gradient desired torque and the driver desired torque so that the power system carries out braking; calculating a current actual torque of the power system; and transmitting a control instruction to the ESP to control the vehicleto start according to the current actual torque, the gradient desired torque and the driver desired torque. According to the hill starting sliding prevention control method, the power system and the ESP are controlled in a coordinated manner to avoid a backward sliding phenomenon and realize stable starting of a hybrid vehicle on a ramp; the control delay and uncertainty are reduced; and the control performance is improved.

The invention relates to a wheel hub motor and a control method thereof. The wheel hub motor comprises a motor shaft (1) and a stator (2), wherein a rotor shell (3) is sleeved outside the stator (2), and the front end and the back end of the stator (2) are rotatablely fixed on the motor shaft (1) through a rotor end cover (4) and a bearing (5); the outer side of the rotor end cover (4) is connected with a hub brake component (9); the rotor shell (3) is connected with a wheel hub (6); a position detection device is arranged at a position corresponding to the wheel hub motor, and comprises a retainer (7) which is fixed on the motor shaft (1) and a magnetic steel ring (11) which is fixed on the rotor end cover (4); a plurality of Hall elements (10) are arranged on the retainer (7); a servo controller (18) is arranged on the motor shaft (1); and the rotor end cover 94) and the motor shaft (1) rotate relatively. The wheel hub motor is simple in structure, energy-saving, high in starting characteristic, small in size, and high in efficiency.

The invention discloses a software implementation method for starting a runaway of a high voltage inverter at fixed frequency. The method comprises the steps of: estimating the rotating speed of a motor which rotates freely without a speed sensor; starting to output a fixed frequency from a low voltage under the premise of controlling the current; slowly improving the voltage till the constant torque point arranged by a normal motor UF (Ultrasonic Frequency) curve; and slowly improving the torque through outputting fixed rotating speed by a stator under a rated current so as to realize synchronous rotation of the stator and a rotor. According to the invention, the rotating speed of the motor is estimated and the output current by the inverter is strictly limited, so that smooth start of the high pressure motor is realized when the rotor is no stationary by a way of slowly improving the torque by output at the fixed frequency.

The invention discloses a range extender starting control method, a range extender and an electric vehicle and relates to the technical field of electric vehicles. After controlling a power generatorto pull an engine to rotate at a pulling torque, a range extender controller adjusts the pulling torque of the power generator according to an engine rotation speed obtained in real time till the engine is started. In the range extender starting process, the torque of the power generator is controlled on the basis of the range extender controller, different pulling torques are given for differentengine rotation speeds so that the pulling torque of the power generator to the engine is reduced with the increasing of the engine rotation speed to realize smooth starting of the engine; and therefore, shaking and noises caused by large rotation speed change in the starting process are avoided, the NVH performance of the electric vehicle is improved, and the prolonging of the service life of theengine is significant.

The invention discloses an energy type router and a soft charging control method and system thereof. The energy type router comprises a plurality of three-phase modular multilevel converters and DAB sub-modules, wherein the number of the DAB sub-modules is the same as that of the three-phase modular multilevel converters; the three-phase modular multilevel converters and the DAB sub-modules are connected in parallel to form a module group. The module group is connected to a high-voltage alternating-current side of a power grid; each of the three-phase modular multilevel converter and the DAB sub-module comprises a capacitor, a first capacitor and a second capacitor. Capacitors of the three-phase modular multilevel converters and the capacitors of the DAB sub-modules are charged based on acomparison result of the capacitor voltage of the three-phase modular multilevel converters and a preset voltage threshold and a target value. According to the invention, rapid and stable charging ofab AC-stage sub-module capacitor can be realized, the DC-stage DAB module charging does not need an additional circuit, the cost is saved, smooth starting of the output-side voltage is realized, andthe overall efficiency and stability of soft charging of the energy router system are further improved.

The invention relates to a slewing mechanism and particularly relates to a slewing mechanism for the fields of tower cranes. The invention provides the slewing mechanism which is simple in structure and low in cost, and is capable of realizing stepless speed adjustment, stably starting and braking and reducing impacts to a crane boom and a tower body. The slewing mechanism comprises an alternative current (AC) motor, a slewing speed reducer, an electromagnetic eddy clutch, an electromagnetic eddy brake, a middle electric pivot, an electric control system and an operation platform. During starting, the middle electric pivot is smoothly started by virtue of the comprehensive actions of the electromagnetic eddy clutch and the electromagnetic eddy brake; the inertial impact during starting is avoided; during braking of the slewing mechanism, the brake time of the slewing mechanism is prolonged by virtue of the electromagnetic eddy clutch and the electromagnetic eddy brake; the stable transition of the slewing mechanism from a motion state to a motion state is realized and the impacts to the crane boom and the tower body during braking are reduced.

The invention discloses a hybrid power converter and a control method thereof. The hybrid power converter comprises an inductor connected to a first end of the hybrid power converter, and a switched capacitor network is connected between the inductor and the second end of the hybrid power converter, wherein the switched capacitor network comprises a plurality of switching elements and a pluralityof capacitors; the switching elements are controlled to be turned on and off according to a plurality of control signals so as to periodically change connection paths of the plurality of capacitors such that the inductor and the plurality of capacitors are charged and discharged, the hybrid power converter adjusts a duty cycle of the control signal so as to convert an input voltage into a desiredoutput voltage. The hybrid power converter can improve the output voltage regulation capability of the circuit, realize circuit miniaturization and improve the conversion efficiency of the circuit.

The invention discloses a base station external power grid capacity increasing and voltage stabilizing system and method. A power grid end, a power supply line and a base station end are connected insequence. The system comprises a structure I or a structure II; according to the first structure, a boosting module is connected between the power grid end and the power supply line in series; and according to the second structure, a boost module is connected in series between the power grid end and the power supply line, and a buck module is connected in series between the base station end and the power supply line. The boost module comprises one or more boost unit for outputting different gear voltages and one or more change-over switch, and the change-over switch controls the correspondingboost unit to be connected with or not connected with the power supply line. Voltage stabilization and capacity increase transformation is carried out without changing an existing external power gridline structure, the structure 1 ensures the working stability of base station equipment, and the power supply efficiency is improved; and the second structure can perform capacity increasing and voltage stabilizing transformation on an existing power supply network. The boost units with different voltage gears can be switched for boosting according to the amplitude change of the base station load,so that the base station load is prevented from overvoltage damage.

The invention discloses an intelligent controller on a kitchen fan and a control method thereof. The controller can realize the time-sharing on-off control to the IGBT through the SPWM algorithm or the V/F algorithm according to the data of a lampblack concentration sensor, and outputs different frequencies and voltage, so as to adjust the running frequency of the fan. The SPWM or the V/F is adopted to control the fan, so that the fan can be smoothly started, and the impact current when a traditional motor starts is completely eliminated; and the SPWM algorithm or the V/F algorithm is adopted,and harsh noise of a motor is reduced through changing the switching frequency, so as to be more suitable for the auditory system of people; the running current of the fan can be detected in real time, and further, the real-time power and the energy conservation proportion can be effectively monitored in real time.