34 results about "Dc motor speed control" patented technology

In speed control that is performed within a single operating cycle of a printer, three-level control of ON control, OFF control, and chopper control, is performed in place of the two-level control of ON control and OFF control, to effectively suppress speed variations due to load variations within a single operating cycle, even in small printers provided with DC motors having small output torques. In a printer comprising a DC motor 7, a paper feeding unit 5 that includes a paper feeding roller that uses the DC motor as the driving source, and a printing mechanism unit 2, for printing, in use of the printing mechanism unit 2, onto paper that is advanced by a specific amount by the paper feeding unit 5, an encoder 10 for outputting pulse signals according to the rotation of the DC motor 7 is provided. The encoder 10 is provided with a pulse forming region for forming a pulsed signal, on the periphery of an encoder plate, where this pulse forming region is provided with a non-uniform spacing region in a section within a uniform spacing region.

The invention relates to an energy-controlled DC motor speed regulating device. The speed regulating circuit is composed of a DC motor, a working power supply, a controllable switch, a diode and an excitation power supply. The working power supply is connected to the armature winding of the DC motor through a controllable switch; the diode Connected in parallel at both ends of the armature winding of the DC motor; the excitation power supply is connected to the excitation winding of the DC motor; the control circuit includes a voltage detection circuit, a current detection circuit, an input energy calculation circuit, an inductance energy storage calculation circuit, an electromagnetic torque calculation circuit, and a load Torque calculation circuit, torque coefficient calculation circuit, expected current calculation circuit, energy storage difference calculation circuit, kinetic energy calculation circuit, load energy calculation circuit, output energy calculation circuit, energy comparison circuit, clock circuit, logic drive circuit, speed detection circuit. The invention reduces the volume, weight and cost of the main circuit, improves the operation reliability, and avoids the adverse influence of the defect of the PID controller itself on the performance of the speed regulating device.

The invention discloses a virtual DC motor control method applied to a bidirectional DC / DC converter, specifically: in order to study the dynamic characteristics of the DC bus voltage, compared with the DC motor speed regulation process, the DC / DC converter resistance inductance is designed Characteristic droop coefficient; In order to introduce inertial and damping characteristics in DC microgrid, a virtual machine control model of bidirectional DC / DC converter is established. The method of the invention improves the traditional P-U droop control, and aims to study the dynamic characteristics of the DC bus voltage and introduce damping and inertia characteristics into the system to maintain the stability of the DC bus voltage. It has been verified by simulation that the control strategy used in the present invention is at the moment of load power fluctuation or light intensity change u dc The magnitude of change is smaller, and it can also quickly reach a new steady state.

The utility model relates to an equilinear speed turning processing device for processing large-screen templates, which belongs to the field of mechanical engineering. It mainly includes: DC speed regulating motor, turntable transmission mechanism, knife row y-direction indexing mechanism, knife row z-direction advance and retreat mechanism, the connection method is: the output of the motor is connected to the input of the turntable transmission mechanism, the base of the turntable transmission mechanism and the The foundation is consolidated, the large carriage in the y-direction indexing mechanism of the knife row is arranged on the beam, and the z-direction advance and retreat mechanism of the knife row is arranged on the large carriage. Adopting the machine tool with the structure of the present invention, the rotating speed of the machine tool turntable is controlled by the computer to drive the turntable to carry out stepless speed change, and the horizontal division Δy of the knife row is measured and displayed by the grating and communicated to the computer control system for controlling the rotating speed of the DC motor , so as to moderately control the rotating speed of the turntable, ensure the cutting amount of the turning tool is consistent, and avoid the occurrence of chatter and tool breakage.

The invention provides a DC motor speed regulation simulation and experiment integrated apparatus and a method. The apparatus includes a host computer unit, a control unit and a DC motor unit. Bidirectional communication between the host computer unit and the control unit are achieved through a USB communication module. The DC motor transmits a value of a real-time rotating speed to the control unit, and the control unit can control the rotating speed of the DC motor unit according to a calculated control value, wherein the control value is calculated according to a deviation value of a set value of the rotating speed of the DC motor and the value of the real-time rotating speed of the DC motor. By adopting the USB communication technology, the DC motor speed regulation simulation and experiment integrated apparatus can continuously transmit data acquired at a high speed to a host computer in real time, real-time communication between sampled data and the host computer can be continuously achieved with no loss at the sampling rate of 6 M / s. According to the method provided by the invention, after requirements of a simulation result are met through DC motor speed regulation system modeling and simulation research on a control algorithm, the control algorithm is directly transmitted to a controller to be carried out an experiment in the DC motor speed regulation simulation and experiment integrated apparatus, to greatly facilitate research on the control algorithm.

The invention relates to a chopper technology-based speed regulating circuit for a brushless DC motor. The chopper technology-based speed regulating circuit for the brushless DC motor comprises an input filter, a single-phase chopper circuit, a chopper filter circuit, a single-phase rectifier circuit, a buffer and discharge circuit, a three-phase inverter bridge, a DSP controller, an isolation signal conditioning circuit and a drive circuit. The DSP controller is adopted as a main control chip, so that a complicated software algorithm is not needed; voltage of the brushless DC motor is modulated by adopting the single-phase chopper circuit, so that over-high inductance is not needed and the torque ripple of the motor is reduced; voltage reduction is carried out by adopting two stages of circuits of an AC chopper and the three-phase inverter bridge in the starting process, so that the starting current of the motor is reduced and the starting reliability of the motor is improved; and a protection signal can be output to protect a control circuit and the motor when an exception occurs.