motor speed control switch

Ngày tải lên: 18/12/2013, 22:06

... root-locus domain. Mechatronics Kevin Craig DC Motor / Tachometer Closed-Loop Speed Control System 24 Mechatronics DC Motor / Tachometer Closed-Loop Speed Control System 1. Introduction This ... well-behaved speed- torque characteristics, and adaptability to various types of control methods. DC motors are classified as either integral-horsepower motors (≥ 1 hp) or fractional-horsepower motors ... power amplifier. Motor speed is measured using an analog tachometer. Figure 2. Physical System Mechatronics Kevin Craig DC Motor / Tachometer Closed-Loop Speed Control System 5 Most...

Ngày tải lên: 25/01/2014, 13:20

Ngày tải lên: 17/12/2013, 14:15

Ngày tải lên: 28/12/2013, 22:07

...  Overview of Gas Springs 2 . 21369 . 2007 . 1  Speed Control TM « SPC Gas Springs, cushioned 2486.12. FIBRO SPC Gas Springs Speed Control TM « are designed to reduce or eliminate the ... caused by the increased return travel speed in high speed presses (link drive presses). SPC Gas Springs feature an integral return travel delay which reduces the speed of the gas spring to 0.4 m/s ... 2 . 21370 . 2007 . 1  3 Speed Control TM « SPC Gas Springs, 2486.12. cushioned subject to alterations Force in daN at Piston...

Ngày tải lên: 22/01/2014, 02:20

Ngày tải lên: 16/03/2014, 12:20

Ngày tải lên: 21/06/2014, 17:20

Ngày tải lên: 29/06/2014, 09:20

... only the torque is controlled without speed control, the time range of control system under transient state is selected short. The motor speeds up to a very large value if the motor is run longer ... BLDC motor drive using four -switch inverter with faster torque response due to the fact that the voltage space vectors are directly controlled. Therefore, the direct torque controlled four -switch ... four -switch DTC of a BLDC motor drive in the constant torque region. II. T HE P ROPOSED FOUR - SWITCH D IRECT T ORQUE C ONTROL OF BLDC M OTOR D RIVE A. Principles of the Proposed Four-Switch...

Ngày tải lên: 03/01/2014, 19:46

Ngày tải lên: 15/10/2013, 16:10

Ngày tải lên: 15/10/2013, 16:12

... standard for the control of switch mode power supply (SMPS) systems has been analog control. Now with the advent of high speed, lower cost digital signal processing (DSP) ICs, digital control there ... boost converter controlled by open-loop control. The duty ratio PI D by closed loop PI control is obtained from the control block diagram which consists of dc voltage and current controllers ... PFC control is the current industry choice but this type of control is not flexible. Therefore, digital based control has many advantages with higher performance since the cost of digital controller...

Ngày tải lên: 27/10/2013, 16:15

... 3.1. The basic control format In essence, we are endeavoring to design a controller that can vary the torque induced in the rotor of the motor. To do this, the induction motor controller will ... for an induction motor An induction motor is an asynchronous AC (alternating current) motor. The least expensive and most widely used induction motor is the squirrel cage motor. The major ... 6.10. The speed response of the control system where the proportional gain of the speed controller is increased As you can see, the transient response is faster as it follows the speed command...

Ngày tải lên: 27/10/2013, 23:15

Ngày tải lên: 13/12/2013, 00:56

Ngày tải lên: 13/12/2013, 03:40

Ngày tải lên: 25/12/2013, 05:17

... Inc. BACK EMF CONTROL METHOD The back electro-magnetic-force (EMF) or sensorless motor control method obtains the speed and position of the motor directly from the voltage at the motor windings. ... stable, reliable and cost-effective control system. Further details on motor control circuits and sensors are provided in several books, including Motor Control Electronics” (10). In addition, ... Parekh, Rakesh, “AN889 - VF Control of 3- Phase Induction Motors using PIC16F7X7 Microcontrollers”, Microchip Technology Inc., 2003. 10. Valentine, Richard, editor, Motor Control Elec- tronics Handbook”,...

Ngày tải lên: 03/01/2014, 18:55

... Operation modes of buck boost converter 2 Unlike constant -speed control, a variable -speed control can adjust the speed of the turbine as the wind speed changes, so as to operate at the peak of the ... proposed MPPT control method. Fig.7: Wind turbine output power without MPPT control method for low wind speed. Fig.8: Wind turbine output power with MPPT control method for low wind speed. ... low wind speeds. Fig.9 : Wind turbine output power without MPPT control method for high wind speed. Fig.10 : Wind turbine output power with MPPT control method for high wind speed. ...

Ngày tải lên: 03/01/2014, 19:15

... converter LOAD P electSpeed Duty ratio VSWT Aero dynamical / Mechanical unit MPPT LPPT Operator Controller speed d Control strategy VSWT Control unit VSWT Electrical unit Fig. 1. Control concept ... power in above rated wind speeds. This control acts directly upon an additional hydraulic system and is very important to protect the blades from breaking. The speed control algorithm serves ... two optimum wind turbines power/torque versus speed characteristics. Two control loops: inner feed forward current control loop and outer voltage control closed loop are applied for the non-inverting...

Ngày tải lên: 03/01/2014, 19:15