BK series machine tools control transformers

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Supply Capability:: 10000pcs pc/month

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1.Application
BK series machine tool control transformer is suitable for circuit of 50~60Hz, voltage up to 500V, usually applied as power supply for machine tool electrical appliances, local lightings and indicator lamps.

2.Structure character
According to different structures, BK transformer belongs to shell type, and according to the installation mode, it belongs to vertical type.

3.Working environment
1.Ambient air temperature: -5^oC~+40^oC, the highest monthly mean temperature should not exceed +30^oC;
2.Altitude for installing place should not exceed 1000m;
3.When the ambient air temperature is +40, the relative humidity should not exceed 50%, and it allows higher relative humidity under lower temperature. Max average humidity in the dampest month is 90%, meanwhile the lowest average temperature of this month is +25^oC, and condensation on the product surface caused by temperature change should be taken into consideration.

4.Specification

Model	Overall size(mm)			Hole distance for installation(mm)		Installation hole (mm)K x J
Model	Bmax	Dmax	Emax	A	C	Installation hole (mm)K x J
BK-50	76	76	83	61±0.4	54±3	5 × 12
BK-100	84	92	100	70±0.4	60±2.5	6 × 12
BK-150	96	105	110	80±0.4	62±2.5	6 × 12
BK-250	105	120	125	88±0.4	73±3	9 × 11.5
BK-300	115	125	125	95±0.4	76±3	9 × 11.5
BK-400	120	130	130	100±0.4	80±3	9 × 11.5
BK-500	134	144	150	100±0.4	86±3	9 × 11.5
BK-700	150	150	158	125±0.4	100±3	9 × 11.5
BK-1000	150	153	160	125±0.4	110±3.5	9 × 11.5
BK-1500	160	240	137	134±0.4	116±3.5	9 × 11.5
BK-2000	189	270	145	158±0.4	122±3.5	9 × 11.5

Type	Outline(mm)	Mounting size(mm)	Primary voltage	Secondary voltage	Weight(kg)	QTY/CTN
BK-25VA	76×80×75	63×44	220V 380V	380V,220V,110V,36V,24V,12V,6V (TO BE CHOSEN)	1.97	16
BK-50VA	85×90×80	71×61			3.3	16
BK-100VA	103×92×95	87×69			5.5	12
BK-150VA	103×100×95	87×76			6.4	8
BK-200VA	103×106×95	87×81			7.3	8
BK-250VA	115×110×130	95×84			9	6
BK-300VA	115×115×130	95×86			9.87	6
BK-400VA	134×132×150	107×93			13.9	4
BK-500VA	134×137×150	107×98			15.5	4
BK-1000VA	153×149×168	128×115			25	2
BK-1500VA	175×185×185	140×135			17	1
BK-2000VA	175×195×185	140×145			21	1
BK-2500VA	207×250×230	168×163			25	1
BK-3000VA	207×250×230	168×173			28	1
BK-4000VA	240×240×250	200×160			40	1
BK-5000VA	240×250×250	200×170			41	1

Q: If the primary circuit of a transformer is connected to a power source and the secondary circuit has a light bulb, will the light bulb turn on and stay on when the power source is turned on? Or will it turn on for a few seconds and then turn off?This question's been bugging me because I think because transformers are usually wired through AC that the bulb would only turn on for a few seconds and then turn off, but then shouldn't current be constantly flowing so it would stay on?Thanks for and clarifications.: Umm, is the power source AC or DC? You are right, transformers usually use AC. Is it not using AC in this example? You didn't say. If it's using AC, the light bulb will stay on. The current actually switches on and off, but so fast you don't see it. Well, normally, for household 60Hz AC power. But who knows with this mystery power source. It could be 1Hz AC. If it's using DC, then it will come on for a short time (a few seconds? I don't know). Yes, current is continually flowing through the primary circuit, but after a while no current will be flowing through the secondary circuit where the light bulb is connected. It takes change in current in the primary circuit to induce a current in the secondary circuit.

Q: I am using an audio transformer in a schematic, but I don't understand why. Can someone explain how a 1000 ohm to 8 ohm audio transformer works? (Radio Shack #273-1380): Isolation Transformer Radio Shack

Q: Transformers of the three transformations are the three?: Take a 10kV / 0.4kV, d / yn11, 100kVA transformer rated voltage full load operation: 1, the high side of the 10kV into the low side of the 400V; 2, the high pressure of 5.77A into low pressure side of 144.4A;

Q: I have two questions:1. Can somebody please explain to me how transformer coupling is so good for maximum power transfer? Please be thorough. Is it because of the primary ac resistance and bjt output impedance being equal? I mean this should work because the power on the primary coil is the same as the power on the secondary coil so the power delivered to the primary coil which is the maximum power in this case, would ideally be delivered to the secondary coil, right? 2. And how can transformers be used to increase the overall voltage gain of a two stage common emitter based amplifier, something like: 1) Its basically impedance matching: the relatively high output impedance of the first stage can be matched to the much lower Hie input impedance of the second stage. Also any attenuation caused by the shunt resistance of the bias resistors working against the output impedance of the first stage (as shown in the R-C C coupled figure for question 2) can be eliminated by applying the bias network voltage at the low side of the transformer secondary, with that point bypassed with a capacitor to provide a good ac ground 2) Replace the 4K collector resistor with the transformer primary winding, eliminate the capacitor C3, connect the high side of the secondary directly to the base of Q2, connect the junction of R1 R2 to the low side of the secondary and add a capacitor from that point to ground to provide adequate low impedance at the lowest frequency of interest. Transformer coupling is efficient, but bandwidth is limited by the transformer, and the overall gain will vary with individual transistors. Both of these warts can be improved by applying negative feedback from the output back to the input stage.

Q: A step up transformer has 5,000 turns in the secondary coil and 200 turns in the primary coil. The primary is supplied with alternating current with an effective voltage of 900V. (A) What is the voltage in the secondary coil? (B) If the current in the secondary coil is 20A, what current flows in the primary coil? (C) What power is developed in the primary coil? (D) What power is developed in the secondary coil?: A step up transformer has 5,000 turns in the secondary coil and 200 turns in the primary coil. N1 200 turns N2 5000 turns The primary is supplied with alternating current with an effective voltage of 900V. V1 900V (A) V2 ? V2 N2 / N1 x V1 V2 5000 / 200 x 900 25 x 900 22,500V (B) I2 20A ; I1 ? V1 x I1 V2 x I2 I1 (V2 x I2) / V1 I1 (22500V x 20A) / 900V I1 500 A (C) P1 ? P1 V1 x I1 P1 900V x 500A 450,000W (D) P2 ? P2 V2 x I2 P2 22,500V x 20A 450,000W Yep, the power in the primary is equal to power in the secondary.

Q: What is the primary side of the transformer: Explanation: The primary side refers to the input side of the voltage, and the secondary side refers to the output side of the voltage after the voltage is converted by the transformer. For the step-up transformer, the primary side is the low side, the secondary side is the high side; For the buck transformer, the primary side is the high side, the secondary side is the low side.

Q: I want to run a electric motor at 6v from a wall outlet. I need to know what wall plug transformer rating I should use to run it. Here is what I have.: You need a device called AC to DC adaptor,output choose 6 volts DC with a current rate at least 1 ampere. Suggest you go to the Dollar shop in your area to search one if your are lucky. Or search more Dollar Shops, it costs $1 or $2. It comes with different output connector. Just cut it off,connect two wires to the DC motor that you have. Some printer or scanner might use the same adaptor,read its output information. If you can find a scrapped old computer,take out the power supply . If it still good (fan running),you can get a very high current output 25 amperes or more at 5 volts (usually is between the wires red and black). This power supply is perfect for your DC motor to run.

Q: Why can autotransformers be used as safety transformers? Isolation transformer is a variable ratio of 1 transformer, why has a security role?: The input and output of the autotransformer share a set of coils, the output is connected to the input grid, and the zero line of the grid is directly connected to the earth. When the operator is standing on the ground contact with the FireWire, if the voltage exceeds the safe voltage of 36V, there may be electric shock casualties occurred. With isolation transformer, the input and output each have a set of coils, and the output coil is not grounded. When the operator stands on the ground to touch the output of a line, because it can not form a loop, there will be no electric shock casualties. Therefore, the use of isolation transformers with safety protection.

Q: Do not all change the pressure? What is the difference?: Transformer is the same frequency of a voltage into another level of voltage, such as the (frequency 50hz) 10kv into (power frequency 50hz) 400v. The inverter can convert DC into any frequency (there are many types of inverter, the output voltage frequency range is different) AC but the voltage level will not change.

Q: Transformer is the transmission of electrical equipment: Transformer is the power of the transmission of electrical equipment, it is the primary energy transformer through the electromagnetic coupling, to the secondary side, we need to become the voltage and current, the frequency does not change the power supply.

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