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

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 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.