Elevator power feedback

1, the use of this series of products

With the further in-depth industrialization, the use of various automated machinery is becoming more and more widespread. In the case of using a motor, the phenomenon of â€œgeneratorâ€ of the motor sometimes occurs, that is, the motor is operating in a state of a generator. For example, the following situation is prone to "power generation" phenomenon:
(1) When the motor decelerates from a high speed operation, such as an elevator, a machine tool, an electric vehicle, and a vehicle, if they decelerate during operation, the motor is actually â€œanti-dragâ€ by the inertia of the mechanical part, causing the motor to convert into electricity. machine.
(2) When the motor drives heavy objects to move downwards, such as elevators, oil field pumping units, cranes, hoists, etc., during the process of weight reduction, gravity potential energy is converted into electrical energy to form power generation. The era science instrument, the industry-driven leader.
(3) In some occasions, the motor is used as a load, and the torque it outputs is a resistance torque, such as dynamometers, centrifuges, etc. There are also some small-scale power generation equipments that have a long time power generation process.
If these devices are driven by a frequency converter, when the motor generates power, the power of the motor will be continuously rectified by the freewheeling diode of the IGBT, and the internal frequency converter will be charged to increase the DC bus voltage of the frequency converter.
At this time, using the time instrument energy feedback device (feedback unit), the DC bus from the inverter to absorb electricity, and through inverter and grid, so that this part of the power back to the grid, you can achieve the recovery and utilization of energy generation . With the use of Epoch's energy feedback device, the entire motor system not only does not consume electricity, but also generates electricity continuously and continuously to the power grid. Therefore, the energy-saving effect is very obvious.

2, the main categories of products and selection guide

The era of science instrument - power feedback products from the technical characteristics of points, can be divided into S1, S2, S3, S4, S5, S6 three major categories.

Power feedback product S1 S2

Power feedback product S3

Power feedback product S4 S5

Power feedback product S6

Cell current

30A / 40A

40A

25A/30A

40A

Technical stage

4th generation technology

5th generation technology

6th generation technology

Current type

Pure sine wave (distortion <5%)

Pure sine wave (distortion <3%)

Adapt to the occasion

Elevator power feedback

Pumping unit energy-saving renovation

Large hoist energy-saving

Laboratory power generator

Elevator power feedback

Elevator Package

Pumping unit energy-saving renovation

Centrifuge matching

Dynamometer supporting

Laboratory power generator

Synchronous motor drive

Elevator power feedback

Elevator Package

Pumping unit energy-saving renovation

Centrifuge energy saving and supporting

Large hoist energy-saving

Large-scale energy-saving driving

Large dynamometer supporting

Power generation unit connected to the grid

Large synchronous motor drive

Special feature

No circulation, any parallel

Power grid self-identification;

No circulation, any parallel connection;

Automatic average flow

Power grid self-identification;

No circulation, any parallel connection;

Automatic average flow

Protective function

Short circuit, over current, over voltage,

Anti-reflux, overheat protection;

Automatic isolation during faults

Short circuit, over current, over voltage,

Anti-reflux, overheat protection;

Automatic isolation during faults

Short circuit, over current, over voltage,

Anti-reflux, overheat protection;
Automatic isolation during faults;

Grid phase protection

Short circuit, over current, over voltage,

Anti-reflux, overheat protection;

Automatic isolation during faults;

Grid phase protection

3, energy feedback product model detailed list - Times Branch instrument

Note: Refer to the following text for specific selection methods.

4, the power feedback product can be configured as a dedicated type - era instrument

Elevator power feedback device-E

Pumping unit dedicated feedback unit -O

Hoist special feedback unit -P

Permanent magnet synchronous feedback unit -M

Dynamometer special feedback unit -T

Inverter module -R

Battery aging special feedback unit -C

Centrifuge special feedback unit -L

5, the selection method of different occasions

For the selection of the electric energy feedback device (regenerative unit) of Time Technology, it is mainly to determine the total current required, and then decide whether to use one product or multiple products in parallel. When multiple products are connected in parallel, the total current is equal to the sum of the currents of each product.

(1) Elevator power feedback device - selection method.
When there is braking resistor, energy saving is carried out. 25A products are selected when the traction machine power of the elevator is 15kW or less; 30A products are selected when the traction machine power of the elevator is 15kW to 22kW; when the traction machine of the elevator is When the power is more than 22kW, choose 40A products.
When there is no braking resistor, the elevator is matched. When the elevator motor power is below 15kW, 25A products can be selected; when the elevator motor power is between 15kW and 18.5kW, 30A products are selected; when the elevator is hoisted When the machine power is between 18.5kW and 30kW, 40A products are selected; when the elevator motor power is above 30kW, 2 units are connected in parallel.

(2) Pumping unit feedback unit - Selection method. 30kW and below, use 25A products. 37kW and below, use 30A products. Above 37kW, use 40A products.

(3) Machinery selection methods: hoist feedback selection, crane feedback selection, road feedback selection, gantry planer feedback selection, punch feedback selection, dynamometer feedback selection, centrifuge feedback selection, vehicle Feedback selection, grid-connected feedback selection, wind power feedback selection, solar power feedback selection, etc., are based on the actual power to calculate the actual current, and include a certain amount of margin, the specific calculation please contact our engineering technology Staff contact.

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