KR20040041223A - Driving apparatus and method for shading coil type single induction motor - Google Patents

Abstract

PURPOSE: A driving device of a shading coil type single-phase induction motor and a driving method thereof are provided to stabilize an operation of the motor by preventing the reverse rotation generated due to a high voltage in an initial driving process. CONSTITUTION: A shading coil type single-phase induction motor includes a ring-shaped rotary magnet, an induction rotor formed at the inner side of the ring-shaped rotary magnet, a parking magnet for locating a position of the magnetic pole of the ring-shaped rotary magnet at the same place, a main coil, and a shading coil. A driving device of the shading coil type single-phase induction motor includes a diode and an NTC. The diode is connected reversely between a power part and a motor coil to interrupt the reverse voltage for generating the reverse-rotational torque. The NTC is connected in parallel to the diode in order to supply the synchronous voltage to the motor.

Description

DRIVING APPARATUS AND METHOD 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.

The present invention has been made to solve the above problems, the drive device of the shading coil type single-phase induction motor to improve the starting efficiency by preventing the reverse rotation caused by the high voltage during the initial start-up and stable starting and The purpose is to provide a method.

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

The present invention for achieving the above object, in the shading coil-type single-phase induction motor driven by a single-phase commercial power supply, is connected in the reverse direction between the power supply stage and the motor winding, to block the reverse voltage generating a reverse rotation torque A diode; It is characterized in that it comprises an NTC connected in parallel to the diode, and applies the voltage to the motor when the forward rotation synchronous voltage is drawn.

According to an aspect of the present invention, there is provided a shading coil starting type synchronous motor driven by a single phase commercial power source, the first process of driving a low inertia ring magnet by a commercial power source to drive an induction rotor; A second step of, when the voltage generating the reverse torque is generated, interrupting the reverse torque generating voltage from the diode to draw forward rotation synchronization; According to the operation of the NTC, it is characterized in that the third step of the normal operation by applying a voltage to the motor.

Hereinafter, with reference to the accompanying drawings, the operation and effects of the driving apparatus and method of the shading coil type single phase induction motor according to the present invention will be described in detail.

Figure 3 is a circuit diagram showing the configuration of the drive device of the shading coil type single-phase induction motor of the present invention, as shown therein is connected in the reverse direction 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.

Claims (4)

A rotating magnet on a ring that rotates freely at the synchronous speed on the motor side and an induction rotor inside the magnet, and a parking magnet at the stator tooth end that always keeps the magnetic poles at the same position. In the coil type single phase induction motor, A diode connected in a reverse direction between the power supply terminal and the motor winding to block a reverse voltage generating a reverse rotation torque; And a NC which is connected in parallel to the diode and applies a voltage to the motor when a forward rotation synchronous voltage is drawn therein. The driving device of the shading coil type single phase induction motor according to claim 1, wherein the NC has a low resistance value by rapidly decreasing the resistance value at a constant temperature. A rotating magnet on a ring that rotates freely at the synchronous speed on the motor side and an induction rotor inside the magnet, and a parking magnet at the stator tooth end that always keeps the magnetic poles at the same position. In the coil type single phase induction motor, A first step of operating the induction rotor by activating a low inertia ring magnet by a commercial power source; A second step of, when the voltage generating the reverse torque is generated, interrupting the reverse torque generating voltage from the diode to draw forward rotation synchronization; According to the operation of NTC, the shading coil type single-phase induction motor driving method, characterized in that performed in the third step of normal operation by applying a voltage to the motor. The driving device of the shading coil type single phase induction motor according to claim 3, wherein the NC has a low resistance value by rapidly decreasing the resistance value at a constant temperature.