Three-state adjusting circuit of brush direct-current motor for pump

Abstract

The utility model discloses a three-state adjusting circuit of a brush direct-current motor for a pump, and belongs to the technical field of structural design of brush direct-current motors for aviation pumps. The method comprises three working states (weakening, basic and stress application), when the brush direct-current motor for the pump works at a low rotating speed, the weakening state is called, performance control of the weakening state is controlled by sliding resistors R36 omega and R27 omega, and when the brush direct-current motor for the pump works at a medium rotating speed, the basic state is called, and the stress application state is called. The performance of the basic state is controlled by the sliding resistor R36 omega, when the pump brush direct-current motor works at a high rotating speed, the pump brush direct-current motor is called as a stress application state, and the performance of the stress application state is controlled by the sliding resistor R36 omega and the sliding resistor R51 omega.

Description

TECHNICAL FIELD

[0001] The utility model discloses a pump with brush DC motor three state regulation circuit belongs to the technical field of brush DC motor structure design for aviation pump. BACKGROUND

[0002] The brush DC motor for aviation pump generally does not adjust voltage (namely under the rated voltage), and is single speed working state. The excitation mode of the brush DC motor for aviation pump is divided into two categories: permanent magnet excitation and electric excitation. The electric excitation is divided into series excitation, parallel excitation, other excitation or complex excitation. When the pump system needs multiple working states, the traditional single speed working state cannot meet the use requirement, and the permanent magnet excitation is fixed magnetic field, and three state use demand cannot be realized, therefore, only the electric excitation mode excitation is adopted, and the three states are adjusted by the sliding resistance to meet the use demand of the pump system. Figure 1 . SUMMARY

[0003] The utility model discloses a new structure that adopts the mode of combining sliding resistance and complex excitation winding to increase and decrease excitation magnetic field.

[0004] The utility model discloses a technical scheme of a pump with brush DC motor three state regulation circuit, the three state regulation circuit is complex excitation structure, and the armature winding is connected in series with the series excitation group, and then is connected in parallel with the parallel excitation winding and the sliding resistance.

[0005] When the motor is in the basic working state, the 2nd and 4th ends of the motor are connected to the "+" pole of the power supply, the 1st end of the motor is connected to the "-" pole of the power supply, at this time, the motor is connected in series with the armature winding and the series excitation winding CJ, the sliding resistance R1 is connected in series with the parallel excitation winding BJ1, and then the two circuits are connected in parallel.

[0006] When the motor is in the weakened working state, the 2nd, 3rd and 4th ends of the motor are connected to the "+" pole of the power supply, the 1st end of the motor is connected to the "-" pole of the power supply, at this time, the motor is connected in series with the armature winding and the series excitation winding CJ, the parallel excitation winding BJ1 is connected with the sliding resistance R1, the parallel excitation winding BJ2 is connected with the sliding resistance R2, and the three branches are connected in parallel.

[0007] When the motor is in the forced working state, the 4th end of the motor is connected to the "+" pole of the power supply, the 1st end of the motor is connected to the "-" pole of the power supply, at this time, the motor is connected in series with the armature winding and the series excitation winding CJ, the parallel excitation winding BJ1 is connected in series with the sliding resistance R1 and the sliding resistance R3, and then the two branches are connected in parallel.

[0008] The maximum resistance value of the sliding resistance R1 is 36Ω.

[0009] The maximum resistance value of the sliding resistance R2 is 27Ω.

[0010] The maximum resistance value of the sliding resistance R3 is 51Ω.

[0011] The utility model discloses the beneficial effect is:

[0012] The utility model discloses the structure is through the adjustment different sliding resistance, realizes in different working condition, the speed and current of brush DC motor for aviation pump satisfy the use demand of user simultaneously. The structural feature of brush DC motor for pump has three working conditions (weakening, basic, reinforcing), when brush DC motor for pump works at low speed, it is called weakening condition, and the performance control of weakening condition is controlled by sliding resistance R36Ω and R27Ω, when brush DC motor for pump works at medium speed, it is called basic condition, and the performance control of basic condition is controlled by sliding resistance R36Ω, when brush DC motor for pump works at high speed, it is called reinforcing condition, and the performance control of reinforcing condition is controlled by sliding resistance R36Ω and R51Ω. BRIEF DESCRIPTION OF DRAWINGS

[0013] Figure 1 It is the schematic diagram of the circuit principle of traditional DC motor;

[0014] Figure 2 It is the schematic diagram of the circuit principle of brush DC motor for pump. PREFERRED EMBODIMENT

[0015] The utility model is further explained in connection with the drawings:

[0016] As Figure 2 Shown, a brush DC motor three state regulation circuit for pump, the three state regulation circuit is compound excitation structure, and the armature winding is connected in series with the series excitation group, and then is connected in parallel with the shunt winding and sliding resistance.

[0017] When the motor is in basic working condition, the 2, 4 ends of the motor are connected to the "+" pole of the power supply, and the 1 end of the motor is connected to the "-" pole of the power supply, at this time the motor is connected in series by the armature winding and the series excitation winding CJ, the sliding resistance R36 is connected in series with the shunt winding BJ1, and then the two circuits are connected in parallel.

[0018] When the motor is in weakening working condition, the 2, 3, 4 ends of the motor are connected to the "+" pole of the power supply, and the 1 end of the motor is connected to the "-" pole of the power supply, at this time the motor is connected in series by the armature winding and the series excitation winding CJ, the shunt winding BJ1 is connected in series with the sliding resistance R1, and the shunt winding BJ2 is connected in series with the sliding resistance R2, and the three branches are connected in parallel.

[0019] When the motor is in reinforcing working condition, the 4 end of the motor is connected to the "+" pole of the power supply, and the 1 end of the motor is connected to the "-" pole, at this time the motor is connected in series by the armature winding and the series excitation winding CJ, the shunt winding BJ1 is connected in series with the sliding resistance R1 and the sliding resistance R3, and then the two branches are connected in parallel.

[0020] The maximum resistance value of the slide resistance R1 is 36Ω.

[0021] The maximum resistance value of the slide resistance R2 is 27Ω.

[0022] The maximum resistance value of the slide resistance R3 is 51Ω.

[0023] Working principle: basic state, by adjusting the resistance R1, and make resistance decrease, excitation current increase, magnetic flux increase, speed decrease. Conversely, to improve the speed, increase the resistance.

[0024] Force state, the performance control of force state is by resistance R1 and R3, because the basic state adjustment has been completed, that is, the R1 resistance position has been determined, no longer adjust the resistance R1, otherwise need to recheck the performance data under the basic state, by adjusting the R3 resistance to adjust the speed and total current, if the total current of the motor is high, the current needs to be reduced, the R3 resistance is increased, the resistance is increased to the current control below a certain value, at the same time, the speed of the brush DC motor for aviation pump is low, the R3 resistance is appropriately reduced, the R3 is repeatedly adjusted, the total current and speed of the brush DC motor for aviation pump in force state are all in the qualified range.

[0025] Weakened state, the performance control of weakened state is by resistance R1 and R2, because the basic state adjustment has been completed, that is, the R1 resistance position has been determined, no longer adjust the resistance R1, otherwise need to recheck the performance data under the basic state, by adjusting the R2 resistance to adjust the speed and current, if the current of the brush DC motor for aviation pump is high, the R2 resistance is increased, the resistance is increased to the current and speed all reach the qualified range, otherwise, if the speed of the brush DC motor for aviation pump is low, the R2 resistance is reduced.

Claims

1. A three-state regulating circuit for a brushed DC motor used in pumps, characterized in that, The three-state regulating circuit is a compound-wound structure, in which the armature winding is connected in series with the series winding CJ, and then in parallel with the shunt winding BJ1 and the sliding resistor R1.

2. The three-state adjustment circuit for a brushed DC motor used in pumps according to claim 1, characterized in that, When the motor is in its basic operating state, connect the "+" pole of the power supply to terminals 2 and 4 of the motor, and connect the "-" pole of the power supply to terminal 1 of the motor. At this time, the motor is connected in series with the armature winding and the series winding CJ, and the sliding resistor R36 is connected in series with the shunt winding BJ1. Then, the two circuits are connected in parallel.

3. The three-state adjustment circuit for a brushed DC motor used in pumps according to claim 1, characterized in that, When the motor is operating in a reduced working state, connect the "+" pole of the power supply to terminals 2, 3, and 4 of the motor, and connect the "-" pole of the power supply to terminal 1 of the motor. At this time, the motor is composed of the armature winding and the series winding CJ connected in series, the parallel winding BJ1 and the sliding resistor R1, and the parallel winding BJ2 and the sliding resistor R2.

4. The three-state adjustment circuit for a brushed DC motor used in pumps according to claim 1, characterized in that, When the motor is working under applied load, connect the "+" terminal of the power supply to terminal 4 of the motor and the "-" terminal of the motor to terminal 1. At this time, the motor is formed by connecting the armature winding and the series winding CJ in series, and the parallel winding resistor BJ1 in series with the sliding resistor R1 and the sliding resistor R3. Then, these two branches are connected in parallel.

5. The three-state adjustment circuit for a brushed DC motor used in pumps according to claim 1, characterized in that, The maximum resistance of the sliding resistor R1 is 36Ω.

6. The three-state adjustment circuit for a brushed DC motor used in pumps according to claim 1, characterized in that, The maximum resistance of the sliding resistor R2 is 27Ω.

7. The three-state adjustment circuit for a brushed DC motor used in pumps according to claim 1, characterized in that, The maximum resistance of the sliding resistor R3 is 51Ω.

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