Q:the actual speed of a six pole a.c motor operating from a 50hz supply with a 6% slip is what?how do i work this out please

n=120f/p =120(50)/6 =1000 slip speed=0.06(1000) = 60 Actual speed= 1000-60 =940 rpm

Q:I replaced a capactor on my blower motor with the same value as recommended on the nameplate. 5uF, 370VAC. It opened up after about a day, then I replaced it with another one and it did the same thing. I checked the value of the cap before installing and it was correct. The motor is rated at 9A, and I am getting a current draw of less than that.

extra likely you're discussing the starting up capacitor. In 50+ years of the electric powered market, i have under no circumstances considered a capacitor stressed in a motor circuit that develop into used even as contained in the run mode. the whole answer is have a qualified specialist electrician come examine the gadget. for my section i might want to replace the motor on the grounds that a failing capacitor shows an older gadget and meaning the motor will fail quicker fairly than later.

Q:Why in general larger aircraft make use of both AC and DC electrical systems.?

AC motors and controls can be made smaller and lighter, especially when driven at 120V and 400 hz. Almost all, if not all, systems that are intended for normal use with normal power will be AC. DC, on the other hand, is the old stand-by when down to just battery power. If a pilot arrives at a dead airplane, with no external power (AC), how will he get the thing running if it requires A/C? With one or two batteries, one DC fuel boost pump, a DC starter on the APU, DC fire detection and DC fire fighting systems, he can safely get the airplane up and running, and if a fire breaks out during the process, he can fight the fire. If there is a loss of all AC generators, then there needs to be some DC powered stuff from the battery (basic flight instruments, basic lighting, etc.) to allow continued flight while attempts are made to restore the AC. On the Boeings, the fallback really important stuff will be found on the hot battery bus, battery bus, DC transfer bus, and standby DC bus. The Airbus probably does the same thing using different names.

Q:I have a cheap reciprocating saw that is 120VAC, 60Hz, 4.5A. Says 0-2300 strokes per minute and has a dial speed adjust,k but slowest is still around 300SPM, I need to slow that down more for a custom project I am working on for a hobby idea. How does the speed control built in work? Any way to duplicate that inline with the AC plug? Is there a way to add an inline circuit to slow it down? If you have any ideas, please share and possibly add schematics. I do not want to have to replace the motor or open the case in any way, so an in-line device would work perfectly.

Try plugging it into the footpedal of a sewing machine they are the best speed controller in the world. you can probably find one at a thrift store or a garage sale for cheap

Q:Why is DC motor wider than AC motor? High speed regulation accuracy? How do you know?

The DC motor has the ability to keep the rated torque from the zero speed to the nominal speed, so it can perform stepless speed regulation from zero speed to rated speed (constant torque).

Q:plz tell me basic difference b/c ac and dc machine in terms of thier working principle?

There are two main types of electric motors. There are direct current or DC and alternating current or AC motors. The reference of DC or AC refers to how the electrical current is transferred through and from the motor. Difference between AC and DC motor somewhat lies in the name as their name reflect their working style. Electric Motor:- It is an electrical device which convert the electrical energy into the mechanical energy. It may be broadly classified into the two types AC motor and the DC motor depending on the type of input used. DC Motors:- A direct current or DC motor, converts electrical energy into mechanical energy and works on Direct current(DC).Among DC motors, there are shunt-wound, series- wound, compound- wound and permanent magnet motors. Dc motors come in two general types. They can have brushes or be brushless. AC Motors:- A current or AC motor, converts electrical energy into mechanical energy and works on alternate current (AC).AC also comes in two type. They can be two phase or three phase.

Q:AC motors are known as the workhorse of industry.

Because AC power is the most comming power in the world. That is the main reason, the contest between AC and DC was over a long time ago and AC won. There are some DC applications but AC is King.

Q:I have a small 1/4 HP 220V AC motor, and I want to see if it will run on a regular household 120V AC circuit. Will it work?

poorly. It will rotate slowly if at all, and may overheat. .

Q:for example: 4-poles or 6-poles: which is difference i can see inside motor?

6 pole motor has two more poles than 4 pole motor. .

Q:Whether there is any change if we give ac supply to a dc motor?

Any change? what do you mean? Certainly the motor won't work, it will just sit there and vibrate. And possibly burn out, depending on the voltage.