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DC motor start circuit controlled by counter electromotive force

Published:2012/9/17 1:39:00 Author:Ecco | Keyword: DC motor start , counter electromotive force

DC motor start circuit controlled by counter electromotive force
When breaker QF is closed, pressing the start button ST will make DC contactor KM pull in, the motor M connected to R1 , R2, R3 in series is started. With the speed increaseing, the counter electromotive force increases, the voltage at both ends of the motor M is increased gradually, so that 1KM, 2KM, 3KM operate in an order, the main contacts will sequentially shorting connect R1, R2, R3, and finally the motor M is put into full pressure operation. 1KM, 2KM, 3KM are DC contactors, the pull-in coil's rated voltage must meet U1KM < U2KM < U3KM. (View)

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Ed Gray Motor Generator

Published:2012/9/16 21:56:00 Author:Ecco | Keyword: Ed Gray, Motor Generator

Ed Gray Motor Generator
This type of design can produce a very high amperage current for a faction a second that can used to do some useful work if properly harnessed. The switching device could be a rotating spark gap as used by Nikola Tesla or some high speed electronic device, it is my belief that only glass tubes such as diodes or triode valves are really good at this and not transistors as they cannot handle the high voltage and high current produced in these devices without burning themselves out. (View)

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Free energy magnet motor

Published:2012/9/16 21:44:00 Author:Ecco | Keyword: Free energy , magnet motor

Free energy magnet motor
This invention relates to a method of producing useful energy with magnets as the driving force and represents an important improvement over known constructions and it is one which is simpler to construct, can be made to be self starting, is easier to adjust, and is less likely to get out of adjustment. The present construction is also relatively easy to control, is relatively stable and produces an amazing amount of output energy considering the source of driving energy that is used. (View)

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Medium Power 12v Brush Motor Speed Controller July 13, 2008

Published:2012/9/9 20:37:00 Author:Ecco | Keyword: Medium Power, 12v, Brush Motor, Speed Controller

Medium Power 12v Brush Motor Speed Controller July 13, 2008
In many applications, you would like to hold the speed of a motor constant, even as variations in the power supply voltage or mechanical load try to change its speed. In other applications, the average current to the motor needs to be limited, so the initial in-rush current when starting the motor is not too high. Also in some applications you would like to allow the motor to be in locked in a stall condition, without doing harm to the motor or the drive circuit. These two features can often be combined in a single control circuit. Source: discovercircuits (View)

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SOLAR POWERED PUMP MOTOR CONTROLLER

Published:2012/9/9 20:35:00 Author:Ecco | Keyword: SOLAR, POWERED , PUMP , MOTOR CONTROLLER

SOLAR POWERED PUMP MOTOR CONTROLLER
A Discover Circuits visitor had a problem. He needed a simple on/off controller for his solar powered water pump. His system used two 12v 50 watt solar panels wired in series. The power from the solar panels drove a submerged water pump. However, during overcast skies the pump motor did not operate properly due to the lack of power from the panel. He wanted a circuit which would turn off power to the motor during low sun conditions. The circuit below performs this function. A small 0.1? x 0.1? photodiode monitors the sunlight intensity. The current from the diode is proportional to sunlight intensity. An adjustable load resistor across the diode converts the current into a voltage and feeds the to a voltage comparator circuit. The output of the comparator drives a small n-channel MOSFET, which in turn drives a high current p-channel MOSFET, controlling power to the pump motor. When the sunlight is less than one fourth of full intensity, power to the motor is turned off. Source: discovercircuits (View)

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The manual series resistor to start three-phase motor circuit

Published:2012/9/6 22:32:00 Author:Ecco | Keyword: manual series resistor , start , three-phase motor

The manual series resistor to start three-phase motor circuit
Operation method: you can click the start button ST, and AC contactor KMT will pull in, then the motor M connected to the startup resistor R in series will start. Until the motor speed is up to 70% of rated speed, and then clicking the run button SN again, KMN pulls in, and its main contact makes R be shorted connected and provides rated voltage for motor M, then the motor will enter the rated operating status. (View)

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555 Timer Forms Simple PWM Motor Controller

Published:2012/9/5 20:35:00 Author:Ecco | Keyword: 555 , Timer Forms , Simple , PWM , Motor Controller

555 Timer Forms Simple PWM Motor Controller
Using a CMOS version of the 555 timer, this circuit can be used to control the speed of a motor by adjusting the duty cycle of the pulses sent to the motor. Source: discovercircuits (View)

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incandescent light life extension switch circuit

Published:2011/9/12 22:02:00 Author:John | Keyword: incandescent light, extension switch

incandescent light life extension switch circuit
Incandescent light’s filament is with large thermal resistance and very small cold resistance. So at the moment of opening light, the impact current flowing through the filament is very large. It can be very easy to make the filament burn within damages. Life extension’s switch can be a good solution to this problem, just as shown in the figure.It can effectively extend lamp’s life greatly. When switch S is connected, the voltage across the capacitor can not change suddenly and the voltage across C is zero. The thyristor VT deadlines without triggering voltage. At this moment, the current flowing through the bulb E is the half-wave current rectified by VD2. The light bulb is pre-heated with darkness and the inrush current is very small. (View)

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Double contact-plate resistance bridge touch switch circuit diagram

Published:2011/9/9 8:00:00 Author:Vicky | Keyword: double contact-plate, resistance bridge touch switch

Double contact-plate resistance bridge touch switch circuit diagram

Resistance bridge touch switch in the picture 1 is composed of LM339. LM339 is a a quad voltage comparator (with 4 identical voltage comparator inside). The circuit only takes use of one of the four. Work voltage range reaches 2-32V. When hands are very close to the double metal plate but not touch them, pin2 of LM339 outputs low level signal, which makes the luminous diode LED1 conducted and lightened. The difference of the resistance bridge touch switch in the picture 2 from picture 1 lies in that it adopts calculating amplifier LF353N instead of voltage comparator. (View)

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Bi-directional speed-adjusting motor driver circuit diagram

Published:2011/9/7 9:27:00 Author:Vicky | Keyword: bi-directional, speed-adjusting, motor driver circuit

Bi-directional speed-adjusting motor driver circuit diagram
Output and level conversion Output signal line is introduced by Port. Pin Port1 is the input end of motor direction signal, pin port2 is the PWN signal input end, and pin port3 is the grounding line. Attention that pin port3 is grounded and connected with a 2kΩ resistance. When the driver panel and monolithic provides power respectively, the resistance can provide the backflow passageway for signal circuit. When the driver and monolithic together use a same group of power, the resistance can prevent high current from flowing to the monolithic mainboard ground wire along the line which will lead to interference. Or, it is equivalent to separate the ground wire of the friver panel and the ground wire of monolithic, and to realize “one-point earth fault”. Capacitance C1 prevents the voltage from going down suddenly which is caused by the sudden start-up of the motor. (View)