Can the inverter be connected to a single phase motor? If so, how can I pick it up?

Single-phase motors can use frequency converters.

Drive, but with prerequisites:

1. The capacitor must be removed, and the reason is what popcdody said.

2. The starting winding and the working winding of the single-phase motor need to be consistent, that is, the starting winding and the working winding are not separated, and the resistance of these two windings is the same.

3. If it is a 380V inverter, then you need to set the maximum output voltage to 220V.

4. It is better to cancel the output phase loss detection function of the inverter.

5. The inverter of the drive needs to be at least one level larger than the capacity of the motor.

Frequency transformer is generally an electrical energy control device that uses the on-off effect of power semiconductor devices to convert the power supply of power frequency to another frequency. The main circuit of the inverter can be roughly divided into two categories: the voltage type is the inverter that converts the DC of the voltage source into AC, and the filter of the DC loop is capacitor; The current type is an inverter that converts the DC of the current source into AC, and its DC loop filter is an inductor.

1.Why can the rotational speed of the motor be changed freely?

Motor rotation speed unit: r min number of rotations per minute, can also be expressed as rpm

For example: 2-pole motor 50Hz 3000 [r min].

4-pole motor 50Hz 1500 [r min].

Conclusion: The rotational speed of the motor is proportional to the frequency.

The rotational speed of an induction AC motor (hereinafter referred to as a motor) is approximately determined by the number of poles and frequency of the motor. The number of poles of the motor is fixed due to the working principle of the motor. Since the pole value is not a continuous value (a multiple of 2, e.g. the pole number is 2, 4, 6), it is generally not suitable to adjust the speed of the motor by changing the value.

In addition, the frequency can be adjusted outside the motor and then supplied to the motor, so that the rotation speed of the motor can be freely controlled.

Therefore, the inverter for the purpose of controlling the frequency is the preferred equipment for motor speed regulation equipment.

n = 60f/p

n: Synchronization speed.

f: Power frequency.

p: Number of pole pairs of the motor.

Conclusion: Changing the frequency and voltage is the optimal motor control method.

If you only change the frequency without changing the voltage, the motor may burn out due to overvoltage (overexcitation) when the frequency decreases. Therefore, the frequency converter must change the voltage at the same time as the frequency. When the output frequency is above the rated frequency, the voltage can not continue to increase, and the maximum can only be equal to the rated voltage of the motor.

For example, in order to halve the rotation speed of the motor, the output frequency of the inverter needs to be changed from 50Hz to 25Hz, and the output voltage of the inverter needs to be changed from 400V to about 200V

2.When the rotational speed (frequency) of the motor changes, what happens to its output torque?

The starting torque and maximum torque when driven by the inverter are less than those driven by direct industrial frequency power supply.

The starting and acceleration shocks of the motor are large when the power frequency power supply is used, and these shocks are weaker when the power supply is used by the frequency converter. Direct starting at the power frequency will produce a large starting current. When the inverter is used, the output voltage and frequency of the inverter are gradually added to the motor, so the starting current and impact of the motor are smaller.

Yes, the output of the inverter can be connected to two wires, but it must be 220V output, and because the inverter only uses two phases, the power used should be reduced by 1 3

After the single-phase motor equipped with a capacitor is connected to the inverter, the inverter will be damaged quickly due to the reverse electromotive force of the capacitor, so it is best not to connect the motor if you do not know whether the motor is equipped with a capacitor.

Summary. Hello, the single-phase 220V inverter cannot be connected to the single-phase motor. In this case, the inverter will judge that the motor is faulty. If the inverter has the function of shielding phase loss protection and the function of setting the output voltage, it can be used.

However, the capacity of the inverter needs to be checked according to the output current. If the inverter does not have the above functions, the protection of the inverter will start and stop the output. Single-phase is not accepted.

The inverter relies on the interruption of the internal IGBT to adjust the voltage and frequency of the output power supply, and provides the required power supply voltage according to the actual needs of the motor, so as to achieve the purpose of energy saving and speed regulation.

How to connect the single-phase 220V inverter with the single-phase motor?

Hello, the single-phase leakage and 220V inverter cannot be connected to the single-phase motor. In this case, the inverter will judge that the motor is faulty. If the inverter has the function of shielding the lack of cavity trace phase protection and the output voltage setting function, it can be used.

However, the capacity of the inverter needs to be checked according to the output current. If the inverter does not have the above functions, the protection of the inverter will start and stop the output. Single-phase is not accepted.

The inverter relies on the internal IGBT interrupting to adjust the voltage search and frequency of the output power supply, and provides the required power supply voltage according to the actual needs of the motor, so as to achieve the purpose of energy saving and speed regulation.

Single-phase 220-volt inverter is equipped with a motor, and a three-phase AC 220-volt motor should be selected, and a single-phase 220-volt motor cannot be used. The so-called single-phase 220-volt inverter refers to the inverter's Moling loss power input (L, N) is a single-phase AC voltage of 220 volts, and the output of the inverter (U, V, W) is a three-phase phase AC 220 volts.

There is no l n end on the inverter.

It's the RT side. Good.

RT means to select the second function, when RT is on, select the second torque boost, the second base collapse frequency, the second rotten circle plus the first slow deceleration time, the second motor constant, and so on.

The input R, S, and T terminals can be connected to the DC voltage regardless of the positive and negative poles, because there is a three-phase rectifier circuit, so no matter how the input is connected, after passing the rectifier bridge, it still touches the positive and negative electricity.

Ordinary motors can use frequency converters. However, it is worth noting that the rated frequency of ordinary motors is 50Hz, and the cooling fan, bearings and base are designed according to the 50Hz fixed frequency and output torque. The biggest advantage of the inverter-driven three-phase AC asynchronous motor is that it can be stepless speed regulation at the upper limit of the set frequency.

Yes, but there are differences, as follows:

Ordinary induction motors can realize frequency conversion control, and there is no difference between the use of frequency conversion motors. However, because it is only designed according to the power frequency, compared with the frequency conversion motor, there are problems such as low efficiency, increased temperature, easy aging of insulation, noise and vibration, and poor cooling.

The inverter is used to change the power frequency of the motor to change the speed of the motor. Therefore, the inverter can be connected to an ordinary motor, and it is also the case at the beginning of the application of the inverter to the motor. However, with the development, some manufacturers have installed the inverter with the ordinary motor, but the principle remains the same.

Inverter energy saving. The energy saving of the inverter is mainly manifested in the application of fans and pumps. After the fan and pump load adopts frequency conversion speed regulation, the power saving rate is 20% to 60%, because the actual power consumption of the fan and pump load is basically proportional to the cubic of the speed.

When the average flow required by the user is small, the fan and pump use frequency conversion speed regulation to reduce the speed, and the energy-saving effect is very obvious.

However, the traditional fans and pumps use baffles and valves to adjust the flow, and the speed of the motor is basically unchanged, and the power consumption does not change much. According to statistics, the electricity consumption of fans and pump motors accounts for 31% of the country's electricity consumption and 50% of industrial electricity consumption. It is of great significance to use a variable frequency speed control device on such loads.

At present, the more successful applications are constant pressure water supply, various types of fans, air conditioning and hydraulic pump frequency conversion speed regulation.

The above content reference: Encyclopedia - inverter.

Under normal circumstances, the inverter can be connected to an ordinary motor, and the ordinary motor here mainly refers to a three-phase asynchronous squirrel cage motor. However, in practical application, we must pay attention to the actual operating frequency of the inverter, if it runs at low frequency for a long time, such as 10Hz, it may cause frequent damage to the motor due to poor heat dissipation; If it is a long-term high-frequency operation, for example, if the actual operating frequency is 75Hz for a long time, the motor will also be frequently damaged. That is to say, if the inverter runs at low frequency for a long time, or if it runs at high frequency for a long time, it must be equipped with a variable frequency motor.