Ask me about the generator! Ask a question about motors!

I don't know what a beer machine is, if your beer machine is an inductive load then it can barely be driven, but it should not be too long, if it is a linear load then it will definitely not be able to move, you need a 5kw generator.

The noise of the generator and the current oil price ** is not very cost-effective, I think you should change your beer machine, I don't know how much your beer machine costs, you can also just change the electrical equipment in your beer machine, such as electric motors or heating wires and the like.

A 5kw generator is about 5,000 yuan.

It is best to connect to a three-phase power supply, if it is connected in a single phase, only a one-phase winding can be used, and a capacitor (moving to a capacitor) can be connected in parallel, but there will be a serious lack of power, which cannot be compared with a single-phase motor of 220V with the same power.

Specific connection method and capacitance calculation formula: <>

Buy Yamaha's gasoline generator, high-power. Now there is only one designated manufacturer of Yamaha generators overseas, if you want to buy it, you have to go to a regular store to buy it, and see if there is this, called Chuangjia Yamaha Sino-Japanese joint venture, in fact, it is Yamaha. The goods are good and cheap, I bought them from Shenzhen Jin Yongsheng Hardware.

Categories: Science & Engineering >> Engineering & Technology Sciences.

Problem description: What are the consequences of closing the two units without full synchronization during the merging process? What is the right way to do it?

Analysis: If the two generators are connected to the power grid, the impact between the two motors is not large. If there is no complete synchronization, it depends on how big the difference is in the case of non-synchronization, if the difference is not big, there is no problem, you can merge the car; This method is quasi-synchronous parallelism, and the large units of the power grid are connected with this method.

If the voltage, frequency and phase of a generator are quite different from the voltage, frequency and phase of the power grid, this is a great impact of the virtual transport of the parallel car, because at this time the power grid will be dragged into the generator, and there is a large current flowing to the generator (the maximum may be twice the short-circuit current of the generator), in fact, some small generators are also connected to the grid in this way, which is called self-synchronous grid connection. The same is true if there are only two generators in parallel.

The generator that has not been used for a long time cannot build voltage, mainly due to the disappearance of remanence, which is to add current to the rotor to allow the voltage to build up (of course, there is no damage to the motor).

Dual-value capacitor single-phase motor, generally designed as starting capacitor operating capacitor (200uf 50uf) (150uf 35uf)., divided into two kinds of large and small horsepower, its core and coil data are different, you first use a 250v35uf capacitor to connect to run, when you feel that the output is not enough and then increase to 250v50uf, if the motor heats too much, you can only use 35uf capacitor.

Capacitance is a physical quantity that represents the ability of a capacitor to hold charge. Capacitance from the physical point of view, it is a static charge storage medium, may be permanent charge, this is its characteristic, it is widely used, is an indispensable electronic component in the field of electronics, electricity. It is mainly used in power supply filtering, signal filtering, signal coupling, resonance, filtering, compensation, charge and discharge, energy storage, DC isolation and other circuits.

Related information

Theoretically (i.e., assuming the capacitor is pure capacitance), the larger the capacitance, the smaller the impedance, and the higher the frequency of passage. However, in fact, most capacitors over 1 F are electrolytic capacitors, which have a large inductance component, so the impedance increases when the frequency is high. Sometimes you will see a large capacitance electrolytic capacitor connected to a small capacitor in parallel, then the large capacitor filters the low frequency, and the small capacitor filters the high frequency.

The function of the capacitor is to pass through AC and DC, and through high frequency and low frequency. The larger the capacitance, the easier it is for high frequencies to pass through. Specifically, it is used in filtering, with a large capacitance (1000 F) filtering low frequencies and a small capacitance (20pF) filtering high frequencies.

Some netizens once vividly compared the filter capacitor to a "pond". Since the voltage across the capacitor does not change abruptly.

It can be seen that the higher the signal frequency, the greater the attenuation, but it is very figurative that the capacitance is like a pond, and will not cause changes in the amount of water due to the addition or evaporation of a few drops of water. It converts the change in voltage into a change in current, and the higher the frequency, the greater the peak current, thus buffering the voltage. Filtering the regret wave is the process of charging and discharging.

The fourth item will be a generator.

The reactive power drops to zero, at this time, the active and reactive power output of the generator are zero, so the output current of the generator return machine is also zero, but the motor voltage is not equal to zero, and the generator voltage is equal to the grid voltage, so the generator still has the excitation voltage and excitation current (the excitation that generates the generator voltage), so the excitation current must be reduced to zero when the generator is completely delisted later. At this point, the generator switch is disconnected, so the generator voltage also drops to zero.

When the generator is detrained, the active and reactive power are reduced to zero, at this time, the armature (stator) current is zero, but the rotor current is not zero, this current is the no-load excitation current of the generator, and the generator voltage it produces is equal to the grid voltage and the opposite direction, so the armature current is zero at this time.

When the asynchronous motor is running, there is a certain difference between its speed and the frequency of the power grid, and when the motor power increases, the slip will also increase, which is manifested as a decrease in speed. If there is no overload, the speed will be restored in a short time.

Once connected to the grid, the frequency of the unit and the grid is kept at 50Hz, so the generator also maintains its rated speed operation, and the speed of the unit changes according to the fluctuation of the grid frequency.

When the load of the generator increases, the output current increases, the electromagnetic torque increases, for the driving motor, the resistance torque increases, and the resistance torque is greater than the driving torque, so the motor speed decreases, the motor back EMF decreases, the current increases, the driving torque increases, and the resistance torque is balanced, and the final speed is slightly lower than the original.

In the case you are talking about, in a relatively small unit without an automatic speed control device, when the load of the generator increases, the resistance of the generator increases, and the speed decreases.

The load of the generator increases, the current increases》The electromagnetic torque increases》The mechanical torque of the generator to the motor increases》The load of the motor increases, and if the rated power of the motor is exceeded, the speed of the motor will decrease.

As the load increases, the current increases, and the power output of the generator increases, which is reflected in the output shaft of the engine as a resistance distance (torque).

When the engine power is constant, the rotational speed is inversely proportional to the torque, so when the output torque increases, the rotational speed decreases.

Describe the generator state operation, input, output, power, slip rate, motor speed.

Describe the generator state operation, input, output, power, slip rate, motor speed: for generators, due to the requirements of frequency, its speed is usually a constant speed, with more than 1500 rpm. And its output power is equal to its maximum power generation.

For example, a 40kw generator has a maximum output of 40 kilowatts. The output power can be arbitrarily changed between 0 40 kW according to the change of electricity consumption (load), but the input speed of the source is basically unchanged, basically keeping 1500 revolutions unchanged.

This paper analyzes why two generators with positive differential modulation characteristics can be directly connected in parallel at the machine end to stabilize the distribution of reactive power.

The situation is different when the generators are running in parallel and in the case of a single machine: first, the grid voltage (expressed in terms of bus voltage) is equal to the voltage at the end of each generator, so the change in the excitation current of each generator will affect the voltage change of the entire grid. In addition, when the total reactive power required by the load is unchanged, the problem of how much reactive power each generator bears also arises.

This question can be divided into: (1) what is the rational or optimal distribution; (2) When the distribution does not meet the requirements, how to transfer the reactive power borne by each generator tends to be reasonable; (3) When a reasonable distribution state is reached, whether it can be maintained, that is, whether the distribution is stable. These problems are related to the excitation regulation system of the generator.

Because the potential of each generator corresponds to their respective excitation current, when the grid voltage is certain and the potential is different, a circulation will be formed between the generators, which is basically reactive, so that the reactive power borne by each generator is inconsistent.

1.The engine (power) is important, but it can't be said completely. The generator and control part cannot be simply ignored. The best generators in China should be Landian, Stanford, Qianghui, etc. (personal opinion). But if the control part is not good, there are many failures!

2.For generators, domestic Shangchai Dongfeng should be more affordable, but it is necessary to choose products that are long. The quality of Shangchai's engine is very stable, and it also has more spare power!

Imported Volov, Rolls-Royce, Mercedes-Benz, Deutz, Steyr, Caterpillar are all good choices!

3.It's not what brand the engine uses, it's what brand the generator set is. Generally, engine manufacturers do not make generators. As for the American Cummins diesel generator set, it should just be a customary name.

4。Problem a to consider when choosing a generator, the power required, such as the common power of 100kw, and the standby power of 120-130kw

That is to say, the power of the generator set is greater than the actual power used. b, fuel economy. c. Ease of maintenance.

Three-phase four-wire is 3-phase 380v, plus 1 0 wire!

Generally, the output voltage of diesel generator set is 380V--400V, and when 220V is needed, it is 220V between any live wire and 0 line.

You are talking about Caterpillar is 380V-400V, why is there a voltage of 400V? Because of the AC voltage, there will be a voltage drop when passing through a certain length of cable, it is possible that the voltage of the generator set is 400V, and after 50 meters of cable, it will only be 380V or lower.

The above is a personal opinion, not necessarily all right, but also ask for your advice!

Yangzhou Hengrui Marine Electromechanical Equipment - specializing in the production of various models and brands of diesel units.

According to the description, there should be no problem with the generator winding and excitation rectifier circuit, and there are three points to pay attention to: 1: Check whether the commutator of the generator is clean or worn. 2：

Check the spring pressure of the carbon brush, whether the carbon brush is in good contact with the commutator or the carbon brush is worn excessively. 3: If the generator does not generate electricity for a long time, the motor does not have magnetism, you need to use the battery to magnetize the windings or increase the speed of the motor to let the motor run for a period of time, and the power will be generated normally.

There are three reasons why generators don't generate electricity.

1. Winding problems. Such as the wrong winding wiring.

2. Circuit problems. Such as whether the rectifier bridge is broken.

3. The remanence of the generator is gone. At this time, just use the battery to power up the windings of the generator, and you're good to go.

In terms of electrical principle, there is no difference between positive and negative generators in terms of whether they can generate electricity, and both positive and negative can generate electricity. However, from the specific structure of the generator, there is a difference between forward and reverse rotation, for example, the cooling fan is not allowed to reverse. After the reversal, the phase sequence of the generator also changes.

If the remanence cannot be generated after the battery is built, it is necessary to consider the winding error, including the winding, embedding, and wiring of the winding.

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