CN202696521U

CN202696521U - Bypass compensated motor starting controller

Info

Publication number: CN202696521U
Application number: CN 201220341269
Authority: CN
Inventors: 林进益
Original assignee: Individual
Current assignee: Individual
Priority date: 2012-07-13
Filing date: 2012-07-13
Publication date: 2013-01-23
Anticipated expiration: 2022-07-13

Abstract

The utility model discloses a bypass compensated motor starting controller which is applicable to the starting and compensating of a motor load loop. According to the bypass compensatory motor starting controller, a motor buffer, a control switch, an automatic power factor controller, a static switch unit group and a low-voltage capacitor group are arranged in the motor load loop; a user starts or stops the motor buffer through the control switch, so that the motor load loop is electrically switched on or switched off, and the motor buffer adjusts the starting voltage through phase control within motor load starting time so as to drive a motor load when the motor load loop is electrically switched off; in cooperation of the automatic power factor controller, at least one input voltage signal and an input current signal in the motor load loop are obtained so as to calculate out a current practical power factor value; when the practical power factor value does not reach an objective power factor value, a compensatory control signal is output to the static switch unit group; the static switch unit group outputs a switch action signal to the corresponding low-voltage capacitor unit group in a zero passage switching control mode; and however, the low-voltage capacitor unit group uses the switch action signal as an instruction, so that the low-voltage capacitor unit group is electrically connected or disconnected from the motor load loop.

Description

The motor starting controller of bypass compensation

Technical field

The utility model relates to a kind of circuit compensation, the motor starting controller that particularly compensates relevant for a kind of bypass.

Background technology

Power factor (be called for short merit because of) is to produce because the electric current of " AC electric power systems " is different with voltage-phase.AC load mostly is the combination of resistance and inductance, and electric current falls behind voltage, and its power factor is less than 1, and mean value is about 80%.The cosine of alternating voltage and electric current angle (θ) is called power factor.Fall behind because user's total power factor is about 0.8, namely " fictitious power " deficiency of system, so the staff of electric power system can add capacitor to be improved, and merit can be dwindled to avoid the situation of lower voltage because of angle θ.Merit can reach 1 because of the highest (θ=0 °); If the phase place of " alternating voltage " can fall behind the phase place of " alternating current ", then be called leading merit because of.

Except the electric power factor affects the working efficiency of load, the Starting mode of motor load wherein, also affect whole motor load loop electricity needs and configuration, when for example motor starts, its starting current is about six times of full-load current, and so large electric current can cause that the loop produces large pressure drop, and very easy other the load disturbance in running that causes of this pressure drop, the lighter's stability is not enough, and severe patient can cause the escape of load circuit.For avoiding this phenomenon, individual other load all can be improved by the method for step-down, general in the streets the Starting mode of motor is adopted Y-triangle loop more, this is known by industry, but the Y-triangle starts its voltage has the multistage transient change, please cooperate consult shown in Figure 1, the change in voltage figure of known Y-triangle starting.The time point of t1 and t2 among the figure, the instantaneous raising of voltage requirements, cause the pressure drop in motor load loop, cause power quality not good, and so instantaneous variation, general power factor controlling is the timely power factor of governor motor load circuit all, except causing power wastage, also causes easily the motor load loop to collapse.

Summary of the invention

Because the problem of above-mentioned prior art, a wherein purpose of the present utility model is exactly at the motor starting controller that a kind of bypass compensation is provided.To solve in the motor load loop when motor load start, cause the disappearances such as power quality interference and power factor compensation be too late.

According to the purpose of this utility model, a kind of motor starting controller of bypass compensation is proposed, be applicable to the electric power compensation in motor load loop.That motor buffer, control switch, automatic power factor controller, static switch unit group and secondary capacitor group are set in the motor load loop.Control switch, electrical connection motor buffer is to control motor buffer and motor load loop as electrical open or electric closed circuit.The motor buffer is arranged between described motor load loop and the described load, passes through phase control in the time in described load starting, and starting voltage is adjusted to the rated voltage that load starts.Automatic power factor controller when the motor load loop is closed circuit is obtained at least one input voltage signal and input current signal, and calculates actual at present power factor value, during the too late target power factor value of actual power factor value, and the output compensating control signal.Static switch unit group comprises a plurality of static switches, and is subjected to the triggering of compensating control signal, makes one of them output switch start signal of static switch.Secondary capacitor unit group comprises plurality of capacitors, capacitor is mutually corresponding with above-mentioned static switch, and be subjected to the switch start signal of one of them static switch, control its corresponding one of them capacitor that connects with operating passing zero, make the electric connection of capacitor or electric disconnection motor load loop.

Wherein, aforesaid automatic power factor controller is to be electrically connected in described motor load loop input with parallel way.

From the above, the motor starting controller of bypass compensation of the present utility model is by slow Starting mode, stablize the electric power in motor load loop, and when motor load power loop factor was not good, in time compensation adjustment was with power quality and the stable person who regulates whole motor load loop.

Description of drawings

Fig. 1 is the change in voltage figure of known Y-triangle starting;

Fig. 2 is the block schematic diagram of the motor starting controller of bypass compensation of the present utility model;

Fig. 3 is its motor buffer start voltage schematic diagram of motor starting controller of bypass compensation of the present utility model.

Embodiment

Hereinafter with reference to relevant drawings, the embodiment according to the motor starting controller of bypass compensation of the present utility model is described, to be convenient to understand for making, the same components among the following embodiment is to illustrate with identical symbology.

See also Fig. 2 and Fig. 3, it is the block schematic diagram of motor starting controller of bypass of the present utility model compensation and its motor buffer start voltage schematic diagram of motor starting controller of bypass of the present utility model compensation.Among the figure, the motor starting controller 2 of bypass compensation is arranged at motor load loop 1, comprises control switch 21, motor buffer 22, automatic power factor controller 23, static switch unit group 24 and secondary capacitor group 25.

Above-mentioned control switch 21 electrical connection motor buffers 22 are with control said motor buffer 22 and motor load loop 1 electrical open or closed circuit.

Said motor buffer 22 is electrically connected between motor load loop 1 and the motor load 26 with series system, and the electrical control of suspension control switch 21, and starter motor load 26, and within the starting time, by phase control starting voltage is adjusted to the startup rated voltage of motor load 26, because the electric current of motor is directly proportional with the voltage of motor, so starting current can be reduced to the respective value of specified starting voltage, and cooperate shown in Figure 3, motor buffer 22 start voltages are stablizes the line rising, does not have the problem of instantaneous voltage rise.Above-mentioned automatic power factor control 23, be electrically connected in the motor load loop 1 with parallel way, and obtain at least input voltage signal and the input current signal in motor load loop 1, calculate present actual power factor value by above-mentioned input voltage signal and input current signal, when the too late target power factor value of actual power factor value, then export compensating control signal.

Above-mentioned static switch unit 24, adopting parallel way is electrically connected in the motor load loop 1, control the secondary capacitor unit group of its electrical connection with operating passing zero, use the infringements such as inrush current (Inrush), instantaneous (Transient) surge voltage and arc light when eliminating secondary capacitor unit group switching, static switch unit group 24 comprises a plurality of static switches, be subjected to the triggering of compensating control signal, make a corresponding wherein static switch output switch start signal.

Above-mentioned secondary capacitor unit group 25 is electrically connected in the motor load loop with parallel way, energy storage by capacitor is to offset inefficient power, improve power factor value, improve the voltage fluctuation variation, secondary capacitor unit group 25 comprises plurality of capacitors and mutually corresponding with above-mentioned static switch group 24, be subjected to the switch start signal of above-mentioned static switch group 24 outputs, control its corresponding one of them capacitor that connects with operating passing zero, make capacitor and 1 electrical connection of motor load loop be closed circuit or open circuit.

The user with the startup of control motor buffer 22 or close the border, and makes motor load loop 1 be electrical open or closed circuit by control switch 21.The user activates motor buffer 22 and makes motor load loop 1 for electric when closed circuit, by phase control starting voltage is adjusted to the rated voltage of motor load 26 within the starting time, promotes starter load circuit 1 with stable voltage.

It is electric when closed circuit cooperating motor load loop 1, automatic power factor controller 23 is obtained at least input voltage signal and input current signal in motor load loop 1, and calculated signals is learnt the power factor value of present reality by this, when the too late target power factor value of actual power factor value, automatic power factor controller 23 output compensating control signals give static switch unit group 24, static switch unit group 24 is by the static switch output switch start signal of correspondence, take 25 its corresponding capacitor starts of operating passing zero secondary capacitor unit group, make wherein capacitor and 1 electrical connection of motor load loop be open circuit or closed circuit, utilize capacitor deposited energy and voltage rise or pressure drop in the governor motor load circuit 1, the electric power input of guaranteeing input can convergence power factor (Power Factor is called for short PF) be 1.

The above only is illustrative, but not is restricted person.Anyly do not break away from spirit of the present utility model and category, and to its equivalent modifications of carrying out or change, all should be contained in the utility model right claimed range.

Claims

1. the motor starting controller of a bypass compensation is characterized in that, is arranged at the motor load loop to regulate the electric power factor value in described motor load loop, and the motor starting controller of described bypass compensation comprises:

The motor buffer is to be arranged between described motor load loop and the motor load, passes through phase control in the starting time in described motor load, and starting voltage is adjusted to the rated voltage that described motor load starts;

Control switch is the described motor buffer of electrical connection, to control described motor buffer and described motor load loop as electrical open or electric closed circuit;

The automatic power factor controller, to be arranged in the described motor load loop, obtain at least one input voltage signal and input current signal, and calculate the actual power factor value with described input voltage signal and described input current signal, and when the too late target power factor value of described actual power factor value, the output compensating control signal;

Static switch unit group is to be arranged in the described motor load loop, comprises the triggering that a plurality of static switches are subjected to described compensating control signal, to one of them output switch start signal of each described static switch; And

Secondary capacitor unit group, to be arranged at described motor load loop, comprise plurality of capacitors, each described capacitor is mutually corresponding with each described static switch, be subjected to one of them described switch start signal of each described static switch, with operating passing zero control its corresponding each described capacitor that connects one of them, making the described motor load of the electric connection of each described capacitor loop is electric closed circuit or electrical open.

2. the motor starting controller of bypass compensation as claimed in claim 1 is characterized in that described automatic power factor controller is to be electrically connected in described motor load loop with parallel way.

3. the motor starting controller of bypass compensation as claimed in claim 1 is characterized in that described secondary capacitor unit group is electrically connected in described motor load loop with parallel way.

4. the motor starting controller of bypass compensation as claimed in claim 1 is characterized in that described motor buffer is electrically connected between described motor load loop and the described motor load with series system.