CN212660023U - NEMA motor divides winding start-up wiring structure - Google Patents

Abstract

The utility model discloses a NEMA motor divides winding start-up wiring structure, including three-phase asynchronous machine, three-phase asynchronous machine includes first phase start-up winding coil e, second phase start-up winding coil f and third phase start-up winding coil g; the first phase starting winding coil e, the second phase starting winding coil f and the third phase starting winding coil g are sequentially electrically connected end to end; after the motor is rotated, the other half of the remaining windings are connected in parallel under the action of the time delay switch, which is equivalent to the conversion from the motor voltage reduction state to the full voltage operation state; the starting motor has the advantages of convenient starting, simple starting circuit and the like.

Description

NEMA motor divides winding start-up wiring structure

Technical Field

The utility model belongs to the three-phase machine field.

Background

At present, a large number of alternating current asynchronous motors are used in industrial and mining enterprises, and most motors are started directly.

The motor can generate peak current at the starting moment because the rotor of the machine core does not rotate at the starting moment, the current tends to be stable after the machine core rotates normally, and the voltage of a power grid is reduced due to overlarge starting current (which can reach about 7 times of rated current), so that the normal operation of other electric equipment is influenced; undervoltage protection may also be activated, causing nuisance tripping of the equipment; meanwhile, the motor winding can be heated by overlarge starting current, so that the insulation aging is accelerated, and the service life of the motor is influenced;

in the prior art, in order to reduce the starting current of the motor, the starting modes generally include self-coupling voltage reduction starting, Y-delta starting, frequency converter starting and the like, but the starting modes are all complex, and particularly the phenomenon that the technical threshold of frequency conversion starting is too high is serious.

Disclosure of Invention

The purpose of the invention is as follows: in order to overcome the not enough that exists among the prior art, the utility model provides a reduce start current's NEMA motor branch winding start-up wiring structure.

The technical scheme is as follows: in order to achieve the above object, the present invention provides a winding division starting and wiring structure for a NEMA motor, which comprises a three-phase asynchronous motor, wherein the three-phase asynchronous motor comprises a first phase starting winding coil e, a second phase starting winding coil f and a third phase starting winding coil g; the first phase starting winding coil e, the second phase starting winding coil f and the third phase starting winding coil g are sequentially electrically connected end to end; a shared wire end between the first-phase starting winding coil e and the second-phase starting winding coil f is T2, a shared wire end between the second-phase starting winding coil f and the third-phase starting winding coil g is T3, and a shared wire end between the third-phase starting winding coil g and the first-phase starting winding coil e is T1; the wire head T1, the wire head T2 and the wire head T3 are respectively and electrically connected with three-phase power L1, L2 and L3;

the device also comprises a first phase delay energization winding coil E, a second phase delay energization winding coil F and a third phase delay energization winding coil G, wherein the first phase delay energization winding coil E, the second phase delay energization winding coil F and the third phase delay energization winding coil G are sequentially and electrically connected end to end,

the common end of the first phase delay energized winding coil E and the second phase delay energized winding coil F is T8, the common end of the second phase delay energized winding coil F and the third phase delay energized winding coil G is T9, and the common end of the third phase delay energized winding coil G and the first phase delay energized winding coil E is T7.

Furthermore, the stub T7 and the stub T1, the stub T8 and the stub T2, and the stub T9 and the stub T3 are all electrically connected through a delay switch; after three-phase power L1, L2 and L3 are electrified, wire ends T7, T8 and T9 are delayed for 2 to 3 seconds under the action of a delay switch, and then the wire ends T1, T2 and T3 are switched on.

Furthermore, the number of turns of the first phase starting winding coil E, the second phase starting winding coil F and the third phase starting winding coil G is N, the number of turns of the first phase delay energization winding coil E, the second phase delay energization winding coil F and the third phase delay energization winding coil G is N, and N is satisfied.

Furthermore, a first phase starting winding coil E and a first phase delay energization winding coil E are wound in the same wire slot, a second phase starting winding coil F and a second phase delay energization winding coil F are wound in the same wire slot, and a third phase starting winding coil G and a third phase delay energization winding coil G are wound in the same wire slot.

Has the advantages that: after the motor is started and rotated, the other half of the remaining windings are connected in parallel under the action of the time delay switch, which is equivalent to the conversion from the motor voltage reduction state to the full voltage operation state; the starting motor has the advantages of convenient starting, simple starting circuit and the like; the driving device can be applied to driving of electromechanical equipment such as a fan, a water pump and a compressor; the peak current of the motor started in a partial winding mode is approximately equal to two thirds of the full-voltage starting, and the starting torque is approximately equal to one third to two thirds of the full-voltage starting; compared with direct starting, the damage to a power grid and the motor can be greatly reduced when the motor is started; meanwhile, the heat dissipation problem during starting is also considered.

Drawings

FIG. 1 is a schematic diagram of the winding wiring of the present invention;

fig. 2 is a schematic diagram of the disconnection of thread ends T7 and T1, thread ends T8 and T2, and thread ends T9 and T3;

fig. 3 is a schematic diagram of the connection of the thread end T7 and the thread end T1, the connection of the thread end T8 and the thread end T2, and the connection of the thread end T9 and the thread end T3.

Detailed Description

The present invention will be further described with reference to the accompanying drawings.

The NEMA motor split-winding start-up wiring structure shown in fig. 1 to 3 includes a three-phase asynchronous motor, the three-phase asynchronous motor includes a first phase start-up winding coil e, a second phase start-up winding coil f and a third phase start-up winding coil g; the first phase starting winding coil e, the second phase starting winding coil f and the third phase starting winding coil g are sequentially electrically connected end to end; the shared wire end between the first phase starting winding coil e and the second phase starting winding coil f is T2, the shared wire end between the second phase starting winding coil f and the third phase starting winding coil g is T3, and the shared wire end between the third phase starting winding coil g and the first phase starting winding coil e is T1; the wire head T1, the wire head T2 and the wire head T3 are respectively and electrically connected with three-phase power L1, L2 and L3;

the three-phase delay power-on winding comprises a first phase delay power-on winding coil E, a second phase delay power-on winding coil F and a third phase delay power-on winding coil G, wherein the first phase delay power-on winding coil E, the second phase delay power-on winding coil F and the third phase delay power-on winding coil G are sequentially electrically connected end to end, a shared line head between the first phase delay power-on winding coil E and the second phase delay power-on winding coil F is T8, a shared line head between the second phase delay power-on winding coil F and the third phase delay power-on winding coil G is T9, and a shared line head between the third phase delay power-on winding coil G and the first phase delay power-on winding coil E is T7.

The line head T7 and the line head T1, the line head T8 and the line head T2, the line head T9 and the line head T3 are electrically connected through a delay switch; after three-phase power L1, L2 and L3 are electrified, the line heads T7, T8 and T9 are delayed for 2 to 3 seconds under the action of the delay switch and then are switched on, and then the line heads T1, T2 and T3 are respectively switched on; therefore, only the first phase starting winding coil e, the second phase starting winding coil f and the third phase starting winding coil g are in an electrified state at the moment of electrifying the three-phase asynchronous motor, so that the peak current at the moment of starting the motor is approximately equal to two thirds of that of the common starting, and the starting current peak value of the motor is effectively relieved; after the motor is started for 2 to 3 seconds, the rotor of the motor rotates, the currents in three-phase power L1, L2 and L3 tend to be stable, at this time, a wire end T7 and a wire end T1, a wire end T8 and a wire end T2, a wire end T9 and a wire end T3 are switched on under the action of a delay switch, at this time, a first phase delay energization winding coil E, a second phase delay energization winding coil F and a third phase delay energization winding coil G are also switched on, the three-phase asynchronous motor recovers to normal power to work, the starting current is effectively reduced, heating of a motor winding is avoided, insulation aging is accelerated, and the service life of the motor is influenced.

In this embodiment, the number of turns of the first phase start winding coil E, the second phase start winding coil F and the third phase start winding coil G is N, the number of turns of the first phase delay energization winding coil E, the second phase delay energization winding coil F and the third phase delay energization winding coil G is N, and N is satisfied;

in the embodiment, the first phase starting winding coil E and the first phase delay energization winding coil E are wound in the same wire slot, the second phase starting winding coil F and the second phase delay energization winding coil F are wound in the same wire slot, and the third phase starting winding coil G and the third phase delay energization winding coil G are wound in the same wire slot; so that the first-phase start winding coil E is in a state of close proximity to the first-phase delay energization winding coil E; at the moment of starting, the first phase delay energization winding coil E, the second phase delay energization winding coil F and the third phase delay energization winding coil G are not energized and are in a cold state, and then when the motor is started, the first phase delay energization winding coil E, the second phase delay energization winding coil F and the third phase delay energization winding coil G can absorb a large amount of heat generated by the first phase start winding coil E, the second phase start winding coil F and the third phase start winding coil G due to current peaks, so that the heat dissipation of the first phase start winding coil E, the second phase start winding coil F and the third phase start winding coil G is promoted at the moment of starting, the winding heating is avoided, and the insulation aging is accelerated.

The above is only a preferred embodiment of the present invention, and it should be noted that: it will be apparent to those skilled in the art that various modifications and enhancements can be made without departing from the principles of the invention, and such modifications and enhancements are intended to be within the scope of the invention.

Claims (4)

1. The NEMA motor divides winding start-up wiring structure, its characterized in that: the three-phase asynchronous motor comprises a first phase starting winding coil (e), a second phase starting winding coil (f) and a third phase starting winding coil (g); the first phase starting winding coil (e), the second phase starting winding coil (f) and the third phase starting winding coil (g) are sequentially electrically connected end to end; a shared wire end between the first-phase starting winding coil (e) and the second-phase starting winding coil (f) is T2, a shared wire end between the second-phase starting winding coil (f) and the third-phase starting winding coil (g) is T3, and a shared wire end between the third-phase starting winding coil (g) and the first-phase starting winding coil (e) is T1; the wire head T1, the wire head T2 and the wire head T3 are respectively and electrically connected with three-phase power L1, L2 and L3;

   the device also comprises a first phase delay energization winding coil (E), a second phase delay energization winding coil (F) and a third phase delay energization winding coil (G), wherein the first phase delay energization winding coil (E), the second phase delay energization winding coil (F) and the third phase delay energization winding coil (G) are sequentially and electrically connected end to end,

   the shared line head between the first phase delay energization winding coil (E) and the second phase delay energization winding coil (F) is T8, the shared line head between the second phase delay energization winding coil (F) and the third phase delay energization winding coil (G) is T9, and the shared line head between the third phase delay energization winding coil (G) and the first phase delay energization winding coil (E) is T7.
2. 2. The NEMA motor split-winding start-up connection configuration of claim 1, wherein: the line head T7 and the line head T1, the line head T8 and the line head T2, the line head T9 and the line head T3 are electrically connected through a delay switch; and after three-phase power L1, L2 and L3 are electrified, a line head T7, a line head T8 and a line head T9 are delayed for 2 to 3 seconds under the action of a delay switch, and then the line head T1, the line head T2 and the line head T3 are respectively switched on.
3. 3. The NEMA motor split-winding start-up connection configuration of claim 2, wherein: the number of turns of the first phase starting winding coil (E), the second phase starting winding coil (F) and the third phase starting winding coil (G) is N, the number of turns of the first phase delay energization winding coil (E), the second phase delay energization winding coil (F) and the third phase delay energization winding coil (G) is N, and N is satisfied.
4. 4. The NEMA motor split-winding start-up connection configuration of claim 3, wherein: the first phase starting winding coil (E) and the first phase delay energization winding coil (E) are wound in the same wire slot, the second phase starting winding coil (F) and the second phase delay energization winding coil (F) are wound in the same wire slot, and the third phase starting winding coil (G) and the third phase delay energization winding coil (G) are wound in the same wire slot.

Images