KR100511275B1 - Driving apparatus for shading coil type single induction motor - Google Patents

Abstract

The present invention relates to a driving device of a shading coil type single phase induction motor, and is intended to improve starting efficiency by stably starting by preventing reverse rotation caused by high voltage during initial startup. To this end, the present invention is a stator winding the main winding and the shading coil wound on the tooth; A rotating magnet on the ring freely rotating at the synchronous speed on the motor side; An induction rotor provided inside the rotating magnet; A parking magnet which always keeps the magnetic pole at the same position at the tooth end of the main winding and the shading coil wound stator; A diode connected in a forward direction between the single-phase commercial power supply stage and the motor winding, and blocking the reverse voltage to draw forward rotation synchronization; The diode is connected in parallel with the diode, and when the forward rotation synchronization is drawn, the high resistance value is changed to a low resistance value, and includes an NTC for lowering the overvoltage applied to the motor at the start to the normal voltage range.

Description

Driving device of shading coil type single phase induction motor {DRIVING APPARATUS FOR SHADING COIL TYPE SINGLE INDUCTION MOTOR}

The present invention relates to a driving apparatus and a method of a shading coil type single phase induction motor, and in particular, a shading coil type single phase induction motor designed to improve starting efficiency by preventing a reverse rotation caused by a high voltage during initial startup. It relates to a drive device and a method of the.

As shown in FIG. 1, the driving apparatus of the conventional shading coil starting type synchronous motor is configured by connecting the motor windings M1 to M4 in series with respect to the single-phase commercial power supply terminal VAC.

At initial startup, when the low inertia ring magnet is activated, the induction rotor is started and operated. The induction rotor placed inside the magnet that operates below the synchronous speed has a predetermined rotation corresponding to the fan load up to the synchronous speed by electromagnetic induction. Drive by water.

At this time, as shown in FIG. 2, the motor may momentarily receive torque in the reverse rotation direction according to the voltage phase applied to the initial motor and the magnet magnetic pole position. In this case, when the motor applied voltage becomes higher than a predetermined level as shown in FIG. 5. There is a problem in that the reverse torque is excessive and the reverse synchronous pull-in is introduced, which causes the motor to rotate in reverse, thereby lowering the driving efficiency of the motor.

That is, there is a section in which reverse rotation occurs due to the single-phase power supply during start-up, mechanical shock is generated, and the magnet that starts at the synchronous speed is sensitive to the start / load inertia and mechanically contacts the fan load. In addition, the operation efficiency of the noise is reduced and there is a problem.

SUMMARY OF THE INVENTION The present invention has been made to solve the above problems, and prevents the reverse rotation caused by the high voltage during the initial startup to start stably, thereby improving the driving efficiency of the shading coil type single phase induction motor driving device. The purpose is to provide.

The present invention for achieving the above object, the main winding and the shading coil is wound around the tooth; A rotating magnet on a ring freely rotating at a synchronous speed on the motor side; an inductor rotor provided inside the rotating magnet; a parking magnet which always keeps the magnetic pole at the same position on the teeth end of the stator wound around the winding wire and the shading coil; A diode connected in a forward direction between the single-phase commercial power supply stage and the motor winding, and blocking the reverse voltage to draw forward rotation synchronization; The diode is connected in parallel, and when the forward rotation synchronization is drawn, a high resistance value is changed to a low resistance value, and includes an NTC for lowering an overvoltage applied to the motor to a normal voltage range at startup. Hereinafter, with reference to the accompanying drawings, the operation and effects of the driving device of the shading coil type single phase induction motor according to the present invention will be described in detail.

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Figure 3 is a circuit diagram showing the configuration of the driving device of the shading coil type single-phase induction motor of the present invention, as shown in the reverse connection between the power supply stage (VAC) and the motor windings (M1 ~ M4), reverse torque A diode (DIODE) for blocking a reverse voltage generating a; It is configured to include an NTC that is connected in parallel to the diode DIODE and applies the voltage to the motor when the forward rotation synchronous voltage is drawn.

4 is an operation flowchart of an embodiment of a method of driving a shading coil starting type synchronous motor of the present invention. As shown in FIG. 4, a first induction rotor is driven by starting a low inertia ring magnet by a single phase power supply (VAC). Process; A second process of, when the voltage generating the reverse rotation torque is generated, blocking the reverse torque generating voltage from the diode DIODE to introduce forward rotation synchronization; In accordance with the operation of the NTC, it is made of a third process of normal operation by applying a voltage to the motor, this operation of the present invention will be described.

First, a low inertia ring magnet is started by a single phase power supply VAC to drive an induction rotor.

That is, when the low inertia ring magnet is activated during the initial startup, the inductor rotor placed inside the magnet which operates at the synchronous speed is operated at a predetermined rotation speed corresponding to the fan load until the synchronous speed by electromagnetic induction.

In this case, as shown in FIG. 5, the single-phase commercial power supply VAC generates a voltage for generating an initial reverse rotation torque, and blocks the reverse rotation torque generation voltage from the diode DIODE.

Then, according to the operation of NTC, the motor is operated by applying a normal voltage to the motor.

At this time, the NTC, by the characteristics as shown in Figure 6, initially maintains a high resistance value, but when a certain temperature or more rapidly decreases the resistance value to operate at a low resistance value to apply a propagation voltage to the motor, The forward synchronous draw voltage is always applied.

In other words, when the reverse torque voltage is generated by the single-phase commercial power supply (VAC) at the initial startup, the diode primarily blocks the reverse torque voltage at the diode DIODE, The overvoltage is lowered to the rated voltage using the temperature characteristic, and is applied to the motor as shown in FIG. 7 to efficiently operate the motor.

The specific embodiments or examples made in the detailed description of the present invention are intended to clarify the technical contents of the present invention to the extent that they should not be construed as limited to these specific embodiments and should not be construed in consultation. Various changes can be made within the scope of.

As described in detail above, the present invention has the effect of improving the initial starting efficiency of the motor by preventing the reverse rotation caused by the high voltage during the initial starting and starting stably.

1 is a circuit diagram showing the configuration of the driving device of the shading coil type single-phase induction motor.

FIG. 2 is a waveform diagram showing a voltage phase applied to an initial motor in FIG.

Figure 3 is a circuit diagram showing a configuration for the drive device of the present invention shading coil type single-phase induction motor.

Figure 4 is a flow chart for the operation method of the present invention shading coil type single phase induction motor.

FIG. 5 is a waveform diagram of an initial reverse rotation possible overvoltage in FIG. 4; FIG.

FIG. 6 shows the characteristics of NTC in FIG.

FIG. 7 is a waveform diagram showing an initial reverse rotation possible phase section in FIG. 4; FIG.

    ***** Description of the symbols for the main parts of the drawings *****

NTC: NC M1 ~ M4: Motor winding

Claims (4)

A stator in which the main winding and the shading coil are wound around the teeth; A rotating magnet on the ring freely rotating at the synchronous speed on the motor side; An induction rotor provided inside the rotating magnet; A parking magnet which always keeps the magnetic pole at the same position at the tooth end of the main winding and the shading coil wound stator; A diode connected in a forward direction between the single-phase commercial power supply stage and the motor winding, and blocking the reverse voltage to draw forward rotation synchronization; Shading characterized in that it is connected to the diode in parallel, when the forward rotation synchronization is drawn, the high resistance value is changed to a low resistance value, including the NTC to lower the overvoltage applied to the motor to the normal voltage range at start-up Driving device of coil type single phase induction motor. delete delete delete