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

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 application discloses a hybrid power converter and a control method thereof. The hybrid power converter includes: a first group of switching elements, an inductor and a switched capacitor network sequentially connected between the first end and the second end of the hybrid power converter, and the first group of switching elements is controlled according to a first group of control signals The connection state of the first terminal of the hybrid power converter is changed periodically; the switched capacitor network includes a second group of switching elements and a plurality of capacitors, and the second group is controlled according to a second group of control signals The switching elements are turned on and off, thereby periodically changing the charging and discharging states of the inductor and multiple capacitors. The hybrid power converter adjusts the duty cycle of the first group of control signals and the second group of control signals respectively, so that the input voltage to the desired output voltage. The hybrid power converter can improve the output voltage regulation ability of the circuit, realize the miniaturization of the circuit and improve the conversion efficiency of the circuit.

A pumping unit system and electricity-saving control method thereof are disclosed. The system includes a control module (1), a driving motor (2), a transmission part (3), a counterweight (4) and a sucker rod (5). The driving motor drives the sucker rod to reciprocate up and down by the transmission part; a position detection module is provided on the shaft of the driving motor, and a current sensor is provided on the input side of the power source of the motor; the control module receives a position information of the driving motor which is outputted from the position detection module and a current information of the driving motor which is outputted from the current sensor, thus realizing a closed-loop control of the driving motor and a judgement of state of doing work during operation of the motor, and turning off the motor when doing negative work. The electricity-saving control method includes the following steps: detecting the state of doing work of the driving motor when the pumping unit is running, judging whether the motor does negative work or not, cutting off power supply to the driving motor if the work is negative. Thus the invention has the merits of electricity-saving, stepless speed regulation, soft start and strong overload capacity.

An integrated hub motor and a control method thereof. The motor includes a motor shaft (4) and a stator (12) fixed on it. A rotor housing (10) is provided around the stator (12). The front and back sides of the rotor housing (10) are rotatablely mounted on the motor shaft (4) by rotor end caps (8, 14) and bearings (6, 19). The two ends of the motor shaft (4) are extended out of the rotor end caps (8, 14) to form a short end and a long end. A bearing cap (1) is mounted on the outside of the rotor end cap (8) and covers the short end of the motor shaft (4). A bearing cap shaft (26) is provided on the center of the bearing cap (1) and projected out of the center of the bearing cap (1). The bearing cap shaft (26) is projected toward the direction of the motor shaft (4). Position detection devices (3) are provided on the corresponding positions of the end of the motor shaft (4) and the bearing cap shaft (26). A servo controller (11) is mounted around the motor shaft (4). The position detection devices (3) detect the rotation of the bearing cap shaft (26) and then transmit a detected signal to the servo controller (11). A rotation angle or position of the rotor is obtained through the process of the servo controller (11) so as to accurately control the motor. The motor has advantages of simple structure, energy-saving,excellent starting characteristic, small size and high efficiency.

The invention discloses a ceiling fan motor control method and device based on non-inductive FOC, and a ceiling fan. The ceiling fan includes a non-inductive FOC controller, a motor position detector for detecting the initial position of the motor rotor when the ceiling fan is stationary, and a motor position detector for collecting ceiling fan motor operation. The current acquisition circuit of the current, the ceiling fan motor control method based on the non-inductive FOC includes: the target operating current of the ceiling fan motor is preset to zero through the non-inductive FOC controller, and the current operating current of the motor collected by the current acquisition circuit is obtained; When the current working current determines that the motor is currently in a reverse state, the control motor enters a static state; the non-inductive FOC controller obtains the initial position of the motor rotor when the ceiling fan motor detected by the motor position detector is in a static state; according to the obtained motor rotor initial position and The target operating current of the ceiling fan motor controls the motor operation. The technical scheme of the invention realizes smooth start-up without reverse rotation of the motor in the ceiling fan.

The invention discloses a network voltage estimation method of a single-phase pulsed rectifier. The network voltage estimation method comprises the steps: a single-phase pulsed rectifier system is divided into two power parts of active power and reactive power, and active power mathematical models and reactive power mathematical models of reference models in a model reference self-adaptation system are built; according to errors of the active power and the reactive power in the reference models and adjustable models, network voltage fundamental wave estimation values are obtained through a PIcontroller in the model reference self-adaptation system; a phase-locked loop is eliminated, and fundamental wave angle information and angle frequency of the network voltage are estimated through a network-side current and the active power and reactive power of the reference models; and a modulating voltage initial value of the rectifier is designed, and smooth starting of a control system is achieved. A model reference self-adaptation control idea is adopted, the active power mathematical models and the reactive power mathematical models of the reference models and the adjustable models arebuilt, and the network voltage of the single-phase pulsed rectifier without a network voltage sensor is accurately estimated.

The present application discloses a hybrid power converter. The hybrid power converter includes: a first group of switching elements connected to the first end of the hybrid power converter, and controlling the first group of switching elements to be turned on and off according to a first group of control signals; an inductor connected to the first One of the connection nodes between a group of switching elements; a switched capacitor network, connected between the inductor and the second terminal of the hybrid power converter, including a second group of switching elements and a second group of capacitors, and according to a second group of control signals Controlling the on and off of the second group of switching elements, thereby periodically changing the charging and discharging states of the inductor and the second group of capacitors, the hybrid power converter adjusts the duty of the first group of control signals and the second group of control signals respectively duty cycle, thereby converting the input voltage to the desired output voltage. The hybrid power converter can improve the output voltage regulation ability of the circuit, realize the miniaturization of the circuit and improve the conversion efficiency of the circuit.

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 discloses a start-up control method for connecting a synchronous condenser to the inverter side of a high-voltage direct current transmission. The method changes the excitation input value of the synchronous condenser at the moment of starting, and enables the exciter to synchronize the synchronous condenser after the system reaches stability for the first time. The excitation input of the condenser is different from the start-up method of the traditional synchronous condenser in that the excitation input value at the moment of start-up is changed. Using the above startup control method can effectively reduce the voltage fluctuation at the port when the synchronous condenser is started, and can reduce the active power consumed and the reactive power generated when the synchronous condenser is started, so that the smooth startup of the synchronous condenser can be realized.

The present application discloses a hybrid power converter. The hybrid power converter includes: a first switch network, connected to the first end of the hybrid power converter, including a first group of switching elements, and controlling the first group of switching elements to be turned on and off according to a first group of control signals an inductor connected to one of the connection nodes between the first set of switching elements; a switched capacitor network connected between the inductor and the second terminal of the hybrid power converter, comprising a second set of switching elements and a second set of capacitors, and The switching elements of the second group are controlled to be turned on and off according to the second group of control signals, thereby periodically changing the charging and discharging states of the inductor and the second group of capacitors, and the hybrid power converter adjusts the first group of control signals and the second group of capacitors respectively. The duty cycle of the two sets of control signals converts the input voltage to the desired output voltage. The hybrid power converter can improve the output voltage regulation ability of the circuit, realize the miniaturization of the circuit and improve the conversion efficiency of the circuit.