What electric motor do you need for your circular saw?

What electric motor for the woodchopper?

For a power of 2.2 kW /3000 rpm./min. one belt of profile B is enough. There is no greater power than a 3kW single-phase 220V motor. But matching 2.2 kW will be with a capacitor with a capacity of 50 μF (microFarad).

The calculation is usually: 7 uF per 100 W motor power is in the case of a 3-phase motor running from a single-phase circuit. Т.о. 2200 : 100 x 7 = 154 µF.

A 220 V motor has two windings: a main winding and an auxiliary winding. In this case the phase shift in the second winding is due to the capacitor and this capacitor is permanently included in the circuit. Therefore, 50 uF is quite enough and with this capacity (better 30) and an average load the rotating magnetic field is as close as possible to a circular shape. The capacitance can be increased, but it will create an ellipsoidal rather than circular magnetic field and one of the windings will overheat. You can switch on a short-term auxiliary power at startup. capacity, but then you will need to manually turn it off after spinning up.What is the primary error? You should initially take a three-phase induction motor, buy capacitors and work in peace. Better another motor 5,5 kW 3000 rpm and 2 capacitors of 150 μF.

You can use ONLY a 220 volt, 3000 rpm (for circular saw), 750 rpm (for woodchopper), 2 watts motor for circular saw.2 kW. Not bad for a circular saw, even for a pretty powerful one. If you put a disc about 300 mm, the pulleys are optimally 1:1, if the disc is 250 mm, then about 4:3. Т.е. To get about 3k on the drive. RPM in the first case and 4-4.5k. in the second. AIIRE brand motor. single-phase, it must have a box with a phase-shifting capacitor. Therefore, the motor can be plugged directly into 220 V, no special start-up measures are required. There must be 4 wires in the terminal box, the connection is usually indicated on the nameplate, often on the back of the terminal box cover.

Engine for circular saw: 3 kW/3000 rpm.Shaft diameter 24 mm, keyed height 243=27 mm, key width 8 mm. Shaft length 50 mm. From shaft to table 90 mm. Weight 39 kg.

Motor for woodchopper: 3 kW/710 rpm.:. Shaft diameter 32 mm, height with key 323=35 mm, key width 10 mm. Shaft length 80 mm. Shaft to table 112 mm. Weight. 48 kg.

Three-phase asynchronous squirrel cage motors for general industrial application are designed for the complete set of electric drives for domestic and industrial use, various mechanisms (machines, pumps, reducers, fans, lifting, transporting and construction machines, etc.).). Differences:. 380 V (three terminals in the terminal box) and 220/380 V (six terminals).

Efficiency at 380 V for motors 5.5 kW, 3 kW. 2,2 kW respectively. 83% ; 79% ; 76,5%. Ratio.Losses respectively. 0,84 = 4,62 kW; 0,74 = real 2,2 kW ; 0,71 = 1,56 kW.

Current at 380 V for motors 5.5 kW, 3 kW. 2,2 kW, respectively. 13,6A; 7,8A ; 6,2A

How to choose the right motor?

There are two motors for sale on the counter. Both. 2,2 kW, 3000 rpm, 220V, foot-mounted, size 80 (shaft diameter 22 mm), the price is approximately the same (the difference in price 10%), produced by different manufacturers. Which one is better to choose?

We recommend to pay attention to such parameter of the motor as its operating mode. See the motor tags: one motor has MODE (operation): S1, the other: S6-40%.

Operation modes of electric machine are defined in GOST 183-74. S1. continuous duty. Operation of the motor at a constant load for a long enough time. The motor reaches a steady-state thermal mode (practically steady temperature of all parts of the electric motor)

S6. intermittent operation mode. The sequence of identical motor cycles in which each cycle consists of a period of operation with constant load and a period of no-load. The duration of the load periods must be such that the motor temperature does not reach a steady-state value.

The load duration (LH) is specified in the motor parameters: 25, 20, 40 and 60%. Duration of one cycle is taken equal to 10 min (if not stated otherwise). Relative load duration is defined by formula PN = N/(NV) 100, where V- idle time. Thus: S6-40% means that the engine should not run more than 4 minutes under load, then 6 minutes idle.Engine power in S6 mode is peak power, it is more than power in S1 mode, and it can be approximately defined by the formula: Such mode of engine work (S6) is typical, for example, for work on “circular saw”.

Can a motor labeled S6 be operated in S1 mode??

It is possible, but at a lower power. In our case the motor AIRE 80C2 in the mode S6-40% will develop the power of 2.2kW (as indicated on the label). But in S1 mode (t.е. during continuous operation) such a motor can deliver up to 1.8 kW (according to manufacturer’s data). Increasing the load in this mode may cause overheating of the motor and damage to it.

Dvigatel_Robin_Subaru_EX21_Premium.html (when there is no 3-phase electricity or as such at all. in the woods or to develop firewood) or power plants for motors

Which motor to choose?

The first criterion for choosing a circular saw motor is power.

It is recommended to choose among motors equipped with a V-belt.

This will simplify the process of transferring the revolutions to the saw blade.

To start the circular saw blade of 350 mm you need 1 kW of power. If using a 170 mm disc, about 500 watts are needed. Therefore, to build a circular saw, use the motor of an old washing machine.

In a circular saw, it is important to be able to control the number of revolutions of the motor, otherwise the saw will simply tear the material. In washing machines, the tachometer, which controls the control module, is responsible for controlling the number of revolutions. However, the device is not connected to the circular, so you will have to use a voltage regulator.

What type to use for the circular saw

There are a total of 3 motor options that can be used for a homemade circular saw:

It is best to use a regular asynchronous motor for 380V and connect it to the same voltage. A circular saw with such a motor will allow you to saw thick workpieces, t.к. It will have enough torque (power) and speed. As a rule, to get such a motor is not any problem.

The second most commonly used are brushless collector motors, they are used in washing machines. Main disadvantage. low power, so it gives out low revolutions. For the same reason you cannot saw thick workpieces with this motor, because.к. it will constantly jam.

The third type. collector, with brushes, such are usually used in power tools and in the manual circulators themselves. Its disadvantage is the price. And b/c it’s hard to find.

In addition to the type of motor, you need to pay attention to other parameters.

In order to choose the most correct motor for the circular machine, it is necessary to calculate the speed of rotation, which any saw blade can withstand. It is usually in the following range 65. 75 m/min. The velocity is measured at the tip of the circle on the tangent.

The shaft speed of the electric motor is found using the following formula:

• V. linear velocity of the point
• ω. angular velocity
• R. radius from the center of the circle to the point at the end where the speed measurement tangent is drawn.

This data allows you to choose an electric motor from a range of products. Angular speed of 833 rpm corresponds to an asynchronous frequency motor AIRE 71 C4.

The advantage of this motor is not only in the possibility of using it in various machine tools, but also in the possibility of changing the phasing, that is, the direction of rotation.

How to wire through capacitors

First of all, determine what circuit is assembled on the motor. To do this, open the cover-bar, where the terminals of the AD are led out, and see how many wires come out of the device (most often there are six).

The designations are as follows: C1-C3 are the beginning of the winding and C4-C6 are the ends. If the starts or ends of the windings are connected to each other, this is a “star”.

The hardest thing is if there are just six wires coming out of the case. In this case you need to look for their corresponding labels (C1-C6).

To implement a three-phase ED connection scheme to a single-phase network, you need two kinds of capacitors. starting and working.

The first ones are used to start the motor at the first moment. As soon as the rotor is wound up to the necessary number of revolutions, the starting capacitor is excluded from the circuit.

If this does not happen, there may be serious consequences, up to and including damage to the motor.

The main function is performed by the service capacitors. Here we should consider the following points:

• The operating capacitors are connected in parallel;
• The nominal voltage should be at least 300 volts;
• The capacitance of the working capacitors should be selected for a capacity of 7 µF per 100 W;
• It is advisable that the run capacitor and the starting capacitor are identical. Popular choices are MBGP, MPGO, KBP and others.

If these rules are taken into account, it is possible to prolong the operation of the capacitors and the electric motor as a whole.

The capacitance calculation must be based on the rated output of the motor. If the motor is underloaded, overheating is inevitable, and then the capacitance of the work capacitor must be reduced.

If you choose a capacitor with a lower capacity than allowed, the efficiency of the electric motor will be low.

Remember that even after disconnecting the circuit, there is still some voltage on the capacitors, so it is worth discharging the device before you start working.

Also note that connecting an electric motor of 3 kW or more to conventional wiring is prohibited, because it can cause the circuit breakers to trip or burn out the plugs. There is also a high risk of melting of the insulation.

To connect a 380 to 220V ED with capacitors, proceed as follows:

• Connect the capacitors to each other (as mentioned above, the connection must be parallel).
• Connect the parts with two wires to the motor and single-phase AC power supply.
• Turn on the motor. This is done in order to check the direction of rotation of the device. If the rotor moves in the right direction, no additional manipulation is necessary. Otherwise the wires connected to the winding should be reversed.

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With capacitor additional simplified. for the star circuit.

With the condenser additional simplified. for a triangle circuit.

Moving parts

After completing the connection of the engine and making sure that it normally builds up and resets revolutions, it is allowed to proceed directly to the device circular saw.

Let’s see what movable parts, which are the main load, we will need:

The operation of the drive should be carried out as follows. The motor transmits the rotation to the shaft, on which the small pulley is pressed. On the latter is a belt that sends revolutions to the second pulley. At first sight everything seems simple, but when the installation of the circular saw is carried out, there are many difficulties to be solved.

The small pulley must be ground. Make three to four cross grooves on it, so the belt has a good catch.

The belt can not be used from an old washing machine, it is enough to take an analogue from another machine. The main thing is that it should be durable and have teeth.

A slightly larger diameter disc is welded to the edge of the large pulley to get a protrusion that prevents the belt from slipping during operation. There’s no need to grind serrations on this pulley, the grip of the belt is quite enough.

The shaft that holds the circular saw, fasteners in the form of a washer and nut should be reliable, so that at maximum speeds the saw is not deformed and did not jump off, injuring workers. It is recommended to use the shaft and fixture from a factory-made circular saw.

The procedure for setting up the circular saw is described for a saw with a 300 mm blade. Many will say that the engine from the CPA will not hold such a saw and will stop. But there are a few rules to keep in mind:

• It is necessary to know how to work correctly on the circular saw;
• The saw is for household use, designed to work with small amounts of materials;
• The successful operation of such a saw is confirmed by numerous reviews.

To put it simply, the saw should not be overloaded and it is better not to run it idle.

Pendulum circular saw with electric motor

Scheme of checking the functionality of the circular saw.

Make a homemade circular saw can be quite easy to saw logs and timber bars, the thickness of which corresponds to the strength of the electric drive installed on it. If you intend to work with large and very thick planks of wood, then you should equip your home-made saw with a really powerful electric motor, as well as install a shaft and belt transmission on it. The best solution in this case would be to install a special pendulum frame.

When making a pendulum circular saw with their own hands as a material for the frame should be used only very strong steel angles. Next, on the ready-made steel frame you will need to place all the mechanisms necessary for the normal operation of the homemade circular saw. With this design you can set the height of the blade without any effort, avoiding excessive design complications.

About the author pobeg

Three-phase motor provides less than half of the rated power on a single-phase basis. I mean, a 3 kW motor will deliver 1-1.5 kW. I don’t think 3kw will be enough. A 380 volt motor would be fine, but a 220 volt one would be better with a bigger one.

Yes, for a 50mm board would need a more powerful motor. I have a circular saw with a 900w motor, well, very weak. Even a forty kilowatt will be a pain to cut, especially if the wood is wet.

I have been working for a long time: electric. A 4 watt motor for a 50mm board is fine. but less than that would be a hassle. ( 380 V and 3000 rpm. saw with a diameter of not more than 250 mm).

3000 rpm, 3 kW is enough to cut a 50 mm board. With 380 volts no problem. 220 volt through the starting capacitor can be electrolytic or a working capacitor at the rate of 70 uF per 1 kW. Main prerequisite, a good chisel disc and pulley on the zl. The diameter of the motor is the same as or slightly larger than the shaft. http://fazadom.com

-I would like to know the power on the shaft of the motor T. е. force required to rotate without overheating the motor just do not guess but calculate. Been designing gears for machine parts and machinery for a long time. I would like to refresh not by trial and error. Recommutated E.Д, 2.2 kw warms up after a short time of operation. Universal shaft with interchangeable knives for planing the surface of boards and cutting edges. How to determine the power on the motor shaft, a mystery.

What is an end saw

Trimmers are a mechanism with a cutting disk designed to cut wood and composite materials at right angles or other required angles. Designed to work on a flat surface. It is allowed to carry and install at a temporarily equipped workplace. Their shape is reminiscent of pipe cutting machines, rebar cutting machines, stone cutting machines.

There are several types of end saws:

Pendulum type. horizontal bed with turntable. There is a lever (pendulum) attached to the back of the circular saw, which is where it got its name. This is where the saw blade is mounted. Workpieces are fed along a guide bar. To make the cut, the arm with the rotating blade retracts into the board.

Combi. the same. Thanks to the hinges, it is possible to rotate the lever relative to the horizontal plane.

With horizontal stroke. Reminds of a pendulum saw, but allows cutting wider parts due to forward and backward movement of the mechanism with a rotating disc on slides.

As a supplement to all trimmers is included:

What Motor to Use for a Circular Saw

• Base for mini circular saw
• Engine mount

Circular saw DIY, This is a good way to save a lot of money and, at the same time, buy quality and reliable equipment. A properly assembled circular saw is not inferior to factory dust and is capable of sawing even very large diameter logs.

The circular saw is used for even cutting of lumber.

How to make a homemade mug?

To be able to see the huge logs on the circular deck comfortably, you need to equip it with a really massive electric drive. In addition, a belt drive, shaft and motor with the greatest thrust are installed for this purpose. All homemade circular saws consist of 2 parts: top and bottom.

There’s always a variety of electrical equipment at the bottom, namely:

circular saw design.

At the top of the circular saw install:

Large homemade circular saw

When making the frame for the top of the saw, it’s best to use a 25 mm wide metal angle. In this case, the rectangle, which will be the frame of the upper part of the circular house, should have a size of 600×400 mm. Next, in the corners of this quadrangle welded four tubes, the diameter of which should be 17 mm, and a height of about 2.2 m.

After that, you must reinforce the two corners on the frame, to which the bearings will later be mounted. The distance between these corners depends on the length of the shaft. The clamps are usually used to secure the bearings. The best thing is if the bearings installed on the homemade wheel are sealed. So you can’t be afraid that the chips will get into the space between the balls, rings and spacer. Also, be sure to cut the threads at the very end of the shaft to mount the blade on it later.

The lower part of the circular saw should be made much more massive, which will give it the necessary stability and reliability. Therefore, when making the bottom frame, you should take a corner with a width of at least 40 mm. In addition, there should be two additional corners attached to the frame, which will continue to hold their motor home circular saws. The most suitable homemade circular saw motor is an asynchronous three-phase motor of at least 1.5 kW and 1500 rpm. The pulley pulley should be quite large, about 80 mm, and should be mounted directly on the shaft itself. In addition, you will need to weld a fairly small metal overlay to the frame that will hold the launcher. The large 2.2 m long pipes that you previously welded in the corners of the frame are needed for high quality belt tensioning so that the metal drums can tighten the thin pipes.

Circular electric motor 220V 4 kW 3000 rpm.

Measuring with a mechanical tachometer requires direct contact with the surface of the object.

Now in the finished supports, made of pipes, you need to install both the bottom and top of the homemade saw, and then tighten and tighten the belt with a lamb. Motor start in this model of circular saws is carried out by starting capacitors. You can use a 220/36 400 W transformer to load the motor and increase its torque.

Circular pendulum with electric motor

Make it home circular saw is quite easy to saw logs and bars of wood, the thickness of which corresponds to the strength of the electric motor installed on it. If you are going to work with large and very thick wooden blocks, then you need to equip your homemade saw with a really powerful electric motor, as well as a shaft and belt drive. The best solution in russia In this case a special pendulum bed will be installed.

When making a circular saw pendulum Only very strong steel angles are used in the frame materials. Next, on the finished steel frame you will need to place all the mechanisms necessary for the normal operation of the homemade circular saw. Thanks to this design, you can effortlessly adjust the height of the blade, while avoiding unnecessary complications with the construction.

The base for a mini circular

To make these household products you will need:

The mini circular saw must stand on a sturdy and stable table, as any rocking can pose a health hazard and interfere with the proper operation of the saw. Before starting to make a machine from a circular saw, it is necessary to make a special table. In this case, metal goats and an ordinary old kitchen table can be used as beds. First you need to connect the goats to each other with a wide wooden board with a thickness of at least 50 mm, and then fix the kitchen table on this base.