CN2482274Y

CN2482274Y - Motor governor

Info

Publication number: CN2482274Y
Application number: CN 01244521
Authority: CN
Inventors: 朱彬; 范建文
Original assignee: Individual
Current assignee: Individual
Priority date: 2001-06-25
Filing date: 2001-06-25
Publication date: 2002-03-13
Anticipated expiration: 2011-06-25

Abstract

The utility model discloses a novel motor speed controller, which comprises an electric motor and a power output circuit. The power output circuit is connected with a soft start circuit in parallel, and the soft start circuit comprises a speed control circuit and a gradually speed-rising circuit both of which are connected in parallel; the speed control circuit and the gradually speed-rising circuit are arranged on the utility model, the process that the motor automatically starts from a low gear and gradually raises the speed is realized, which only has a little effect to the voltage sag of the electric network.

Description

The novel motor speed regulator

The utility model relates to a kind of speed regulating device of motor.

In the prior art, the problem and shortage of common alignment circuit is, can not soft start during startup, and the influence to line voltage when causing starting is very big, electric voltage dropping.Patent Office of the People's Republic of China on October 11st, 2000 Granted publication name be called the utility model patent of " the soft starter for motor device of dust catcher " (patent No. is that ZL99252348.6, notification number are CN2400051Y), " it comprises first start-up circuit, second start-up circuit, motor circuit, logic control circuit.Elder generation is by the first start-up circuit work during electric motor starting, therefore the angle of flow of bidirectional triode thyristor TR3 is less, motor is quickened to the slow-speed of revolution of R5 and C5 setting from zero rotating speed earlier, after the time-delay, motor speed reaches the slow-speed of revolution of described setting substantially, and first start-up circuit is switched, and second start-up circuit comes into operation, make the rotating speed of described motor when operate as normal quicken, because electric motor starting is divided into two-stage and progressively quickens, the starting current when therefore starting is little ".The problem and shortage of above-mentioned patent is: though can realize soft start during startup, and it is less relatively to the influence of line voltage, but initial start and homophony speed circuit operates being connected of these two states and will have jumping phenomenon, reason is that homophony speed circuit is can speed governing, can regulate by the user arbitrarily, particularly speed governing is when high state, and this sudden change will be clearly, and the result is that dust catcher or electric tool will have a shake.

The purpose of this utility model is: a kind of novel motor speed regulator is provided, and this speed regulator has realized that motor starts also the process of raising speed gradually from low grade automatically, and little to the influence of electric network electric voltage drop, circuit structure is simple, low production cost.

The technical solution of the utility model is: a kind of novel motor speed regulator, comprise motor and power output circuit, described power output circuit also is connected to soft starting circuit, soft starting circuit by and the alignment circuit that connects and gradually the raising speed circuit form.

The technical scheme that the utility model is detailed is: a kind of novel motor speed regulator, comprise motor and power output circuit, described power output circuit also is connected to soft starting circuit, soft starting circuit by and the alignment circuit that connects and gradually the raising speed circuit form; Described alignment circuit by capacitor C 2, C3 serial connection bridge rectifier B1 after and meet speed adjusting resistance RW, R4 and form; The described circuit of raising speed is is gradually charged and discharged circuit and is formed by diode D1, resistance R 3 serial connections; Described route R5, C5 and the BG1 composition of discharging and recharging.

The utility model has the advantages that:

1. the utility model is provided with alignment circuit and raising speed circuit gradually, has realized that motor starts and the process of raising speed gradually from low grade automatically, and is little to the influence of electric network electric voltage drop.

The utility model compared with prior art, simple, the low production cost of circuit structure.

The utility model will be further described below in conjunction with drawings and Examples:

Fig. 1, Fig. 2 are the circuit theory diagrams of prior art;

Fig. 3 is an electrical block diagram of the present utility model;

Wherein: 1 motor; 2 power output circuits; 3 soft starting circuits; 4 alignment circuits; 5 raising speed circuit gradually; 6 charge and discharge circuit.

Embodiment: as shown in Figure 3, a kind of novel motor speed regulator, comprise motor [1] and power output circuit [2], described power output circuit [2] also is connected to soft starting circuit [3], soft starting circuit [3] by and the alignment circuit [4] that connects and gradually raising speed circuit [5] form; Described alignment circuit [4] by capacitor C 2, C3 serial connection bridge rectifier B1 after and meet speed adjusting resistance RW, R4 and form; The described circuit of raising speed gradually [5] is charged and discharged circuit [6] and is formed by diode D1, resistance R 3 serial connections; The described circuit [6] that charges and discharge is made up of R5, C5 and BG1.

Operation principle of the present utility model is: after the power on circuitry, AC sine wave passes through R1, R2 is to C2, C3, C4 charges simultaneously, because capacitor C5 initial condition voltage is zero, pass through C2, the electric current of C3 is through rectifier bridge B1, BG1 charges to C5, because the capacity of C5 is bigger, therefore the voltage at C5 two ends is a process slowly by zero to stablizing, need time through several and even a hundreds of cycle, the alternating current voltage at motor two ends is to increase gradually along with the increase of C5 voltage, up to stable, stable state is determined by potentiometer RW, thereby has realized the low-grade startup process of raising speed gradually.

At the positive half cycle of alternating current, before the bidirectional triode thyristor T1 conducting, C5 is recharged, and after the T1 conducting, C5 discharges by R5, and the impulse electricity time is by the conduction phase angle decision of T1; Negative half period at alternating current, before the T1 conducting, C5 is recharged, after the T1 conducting, alternating current continues charging by the branch road that D1, R3, C5, B1, T1 form to C5, the voltage of C5 is raise, thereby make T1 some deviations be arranged, reduced the amplitude of triple-frequency harmonics at the positive-negative half-cycle angle of flow of alternating current.

Speed governing of the present utility model is realized by potentiometer RW, changes the conduction phase angle of T1 by the size of regulator potentiometer resistance.

Claims

1. a novel motor speed regulator comprises motor [1] and power output circuit [2], it is characterized in that: described power output circuit [2] also is connected to soft starting circuit [3], soft starting circuit [3] by and the alignment circuit [4] that connects and gradually raising speed circuit [5] form.

2. novel motor speed regulator according to claim 1 is characterized in that: described alignment circuit [4] by capacitor C 2, C3 serial connection bridge rectifier B1 after and meet speed adjusting resistance RW, R4 and form.

3. novel motor speed regulator according to claim 1 is characterized in that: the described circuit of raising speed gradually [5] is charged and discharged circuit [6] and is formed by diode D1, resistance R 3 serial connections.

4. novel motor speed regulator according to claim 3 is characterized in that: the described circuit [6] that charges and discharge is made up of R5, C5 and BG1.