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The constants '''K<sub>M</sub>''' (motor size constant) and ''' K<sub>v</sub>''' (motor velocity constant, or back EMF constant) are values use to describe characteristics of electrical motors.
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== Motor constant==
''K<sub>M</sub>'' is the ''motor constant'' Ref:<ref>http://www.motioncomp.com/pdfs/Motor_Constant_Great_Equalizer.pdf</ref>(sometimes, ''motor size constant''), defined as:
:<math>\frac{\tau}{\sqrt{P}}</math>
where
* <math>\scriptstyle \tau</math> is the motor torque (SI units, N·m)
* <math>\scriptstyle P</math> is the resistive power loss (SI units, W)
The motor constant is winding independent (as long as the same conductive material used for wires); e.g., winding a motor with 6 turns with 2 parallel wires instead of 12 turns single wire will double the velocity constant, K<sub>v</sub>, but K<sub>M</sub> remains unchanged. K<sub>M</sub> can be used for selecting the size of a motor to use in an application. K<sub>v</sub> can be used for selecting the winding to use in the motor.
 
== Motor velocity constant, back EMF constant ==
 
''K<sub>v</sub>'' is the motor velocity constant, measured in RPM per volt (not to be confused with ''kV'', the abbreviation for ''kilovolt'').<ref>[https://unitedhobbies.com/UNITEDHOBBIES/store/wikishow.asp?idwiki=4 United Hobbies: "Kv rating explained"]</ref> The K<sub>v</sub> rating of a brushless motor is the ratio of the motor's unloaded RPM to the peak (not RMS) voltage on the wires connected to the coils (the ''back-EMF''). For example, a motor of K<sub>v</sub>, 5,700&nbsp;RPM/V, supplied with 11.1&nbsp;V, will run at a nominal 63,270&nbsp;RPM (5,700&nbsp;RPM/V × 11.1&nbsp;V).
 
The terms ''K<sub>e</sub>'',<ref name="kk">{{citation| url = http://hades.mech.northwestern.edu/images/6/61/Asst7.pdf| title  =Mystery Motor Data Sheet| work = hades.mech.northwest.edu}}</ref> ''K<sub>b</sub>'' are also used,<ref>{{citation| url =http://www.smma.org/PDFs/SMMA_motor_glossary.pdf|title = GENERAL MOTOR TERMINOLOGY| work = www.smma.org}}</ref> as are the terms  ''back emf constant''.<ref>{{citation| url = http://www.mathworks.co.uk/help/toolbox/physmod/elec/ref/dcmotor.html|title =DC motor model with electrical and torque characteristics - Simulink| work =www.mathworks.co.uk}}</ref><ref>{{citation| url  =http://www.micro-drives.com/motor-calculations.aspx| title = Technical Library > DC Motors Tutorials > Motor Calculations| work = www.micro-drives.com}}</ref> or the generic ''electrical constant''.<ref name="kk"/>
 
The field flux may also be integrated into the formula:<ref>{{citation| url = http://iitd.vlab.co.in/?sub=67&brch=185&sim=470&cnt=1| title = DC motor starting and braking| work = iitd.vlab.co.in}}</ref>
 
:E<sub>b</sub> = K<sub>ω</sub>Φω
:''Where E<sub>b</sub> is back emf, K<sub>ω</sub> is the constant, Φ is the flux, and ω is the angular speed''
 
An inverse measure is also sometimes used, which may be referred to as the speed constant.<ref name="kk"/>
 
By [[Lenz's law]], a running motor generates a back-EMF proportional to the RPM. Once the motor's rotational velocity is such that the back-EMF is equal to the battery voltage (also called DC line voltage), the motor reaches its limit speed.
 
==References==
{{reflist}}
 
==External links==
*[http://www.electricmotors.machinedesign.com/guiEdits/Content/bdeee3/bdeee3_5.aspx DC Motors], Electric motor reference center
*{{citation| url =http://biosystems.okstate.edu/home/mstone/4353/downloads/Developement%20of%20Electromotive%20Force.pdf| title = Development of Electromotive Force| work = biosystems.okstate.edu}}
 
[[Category:Electric motors]]

Latest revision as of 22:47, 1 December 2014

Home improvement could become your new hobby and help you make your home more valuable. Improving your home can add to its value. You can also run into disaster. This article delves into the techniques that you should use to remodel your home.

Before you commit to a new paint color for the exterior of your home, spend some time driving around and looking at homes that you like the look and color scheme of. Paint chips are too hard to envision, so seeing it in person can help you make a better decision.

Buying fancy decorative pillows can be expensive and occasionally they may not all match. A great way to get around this problem is by buying some fabric and sewing your own pillow cases or pillow coverings. If you choose to make your own pillows, sew the outside of the case and then use stuffing from your old and unwanted pillows to fill the new ones.

Just like when you move a heavy piece of furniture with drawers in it, you will want to remove these from your cabinets and counter bases before you install them. They will be much lighter and easier to deal with if these have been taken out ahead of time. They are very simple and easy to put in when you are finished.

Every bathroom, kitchen and laundry area needs an exhaust fan. This keeps moist air headed outside and stops mold growth indoors. It also prevents rot by stopping condensation from forming inside your walls.

You need to ensure there is proper ventilation in the bathroom with either the installation of a window or through some other means. If your bathroom does not have ventilation it will quickly become a haven for bacteria and mold. Painting the bathroom is a good way to hide the mold but it will not treat the problem. Rather, take a preventative step that keeps it from growing in the first place. Put in a vent or new window to help air the room out.

You do not have to have a mansion to have a chandelier. A good chandelier that stands out in any home can be bought for less than five hundred dollars. To really brighten up your fixture, try and get a total wattage of at least 200.

If every closet, cabinet, and drawer in your home is filled to capacity, consider building a garden storage shed on your property. These structures add considerable worth to the resale value of a home and are ideal for storing garden implements, tools, extra lawn furniture, and other belongings that can be safely stored outside.

Chandeliers have a place in even modest homes today. You can get yourself an elegant chandelier for less than $500 to compliment any room. Look for a chandelier with total wattage in the 200 to 400-watt range to achieve maximum light and sparkle.

While many homes come with smoke detectors, fire safety experts often recommend installing heat and carbon monoxide detectors as well. By taking every possible precaution, you may be saving your family's life or even your own by taking steps to detect any possible sign of trouble as soon as possible.

If you are planning a home improvement project, plan the project before you worry about the budget. Go ahead and price various options, but don't let yourself think about what you can actually afford until you've picked a style. This way, you can focus on what works for you and your house, instead of focusing on the money. Most plans can be adapted to a much lower budget.

Clean with an old toothbrush you no longer use. They can be used for cleaning kitchen and bathroom faucets as well as car engines. As a bonus, these handy tools are free. No need to buy something new; utilize what yo have available. You can surely use that money on something else.

You can add on another room to your home to make it more functional. Consider the benefit of having more space for your family and your favorite activities. This will increase the value of your home, and it will improve your living environment. However, don't do this until you have enough money because this type of project can be rather costly.

While home improvement projects can make vast improvements, there is also the potential downside if something goes wrong. Some of the renovations that you do will not pay off in the long run. By applying these simple rules of home improvement do's and do-not's, you can keep from making a disaster that you will be forced to live with.

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