1. Open the junction box and record the connection mode of the motor-star connection or angle connection.
2. Dismantle the motor and record the number of slots, series, core size and connection mode of the motor.
3. Disassemble the winding, record the number of turns, the number of turns, the wire diameter and the circumference of each turn, and check the turn-to-turn connection mode (concentric or chain ...)
4. Clean the slot and pad it with slot paper, and wait for offline. ?
5. Wind new winding wires and bundle them according to the recorded data, and start off the assembly line after all windings are completed.
6, according to the corresponding order, turn in turn, after the completion of all, mat insulation paper.
7, according to the recorded connection mode, connect the indirect line of turning and make the lead.
8. Bundle the windings, connect the leads, and measure the insulation between each phase of the motor and the shell to see if there is any short circuit. If it is correct, the next step is to heat and spray paint, and then it can be assembled when the paint is dry.
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Winding of single-phase asynchronous motor
First, the steering is fixed.
When this kind of motor works normally, only one kind of motor rotates, such as blower, submersible pump and pulverizer. The secret of wiring summarized by the author is: single-phase covered and split-phase, the outgoing terminal looks at rotation, the split-phase is changed from auxiliary to main, and the cover electrode is changed from main to auxiliary.
1, covered pole motor
No matter the salient pole type or the hidden pole type, the connection mode is in line with "the cover pole is changed from main to auxiliary". For example, 40W Heilongjiang brand blower, 12 slot with 2 poles, has a decentralized winding and hidden pole structure, and its terminal wiring is shown in the right figure. The main winding is 1 4 in and 7 out, 10 in and 7 out, that is, first in and then out. Each secondary winding forms a short-circuit ring with only 2 turns. In the figure, AB is the neutral line of the main winding and CD is the neutral line of the secondary winding. Because of this connection, the steering always rotates from the neutral line of the primary winding to the neutral line of the secondary winding. Seen from the paper (terminal), the motor rotates clockwise. When wiring, the actual steering of the load must prevail, and the position of the terminal must be selected so that the theoretical steering is consistent with the actual steering. Therefore, the above rule is simply called the steering from the leading end, and the cover rod is turned from the main steering pair.
2, split-phase type
This kind of motor has four groups (or eight groups) of wires, two groups (or four groups) of which are primary windings and two groups (or four groups) of which the neutral wire is 90(2 poles) or 45&; (4 poles), there are two connection modes:
1) When the symmetrical motors of the main and secondary windings are connected, a lead wire is led out at the head of the main and secondary windings, and a lead wire is connected at the end of the lead wire as a male * * * line (zero line). When wiring, connect the male * * wire to any conductor of the power supply, connect the capacitor between U 1 and Z 1, then plug in the power supply plug, touch another conductor at either end of the capacitor until the steering is consistent with the actual requirements, then unplug the power supply plug and wrap the conductor, as shown in the following figure.
2) Motors with asymmetric windings generally have a large capacity, ranging from several hundred watts to several kilowatts, such as water pumps, grinders, shredders, powder presses, dough presses, etc. , are capacitor operation or capacitor start, the main winding wire is thick and the number of turns is small; The secondary winding wire is thin and has many turns. For example, the motor with model YL 100L-4 is a dual-value capacitor motor, with the main winding of U 1-U2 and the secondary winding of Z 1-Z2. When wiring, U2 and Z2 are connected as a male * * * lead (zero line), so according to the formula, his steering is a split phase from secondary to primary.
That is, from Z 1 to U 1, the turns are clockwise, U 1-U2 is the main winding, and Z 1-Z2 is the secondary winding. When wiring, U2 and Z2 are connected as a male * * * lead (zero line), so according to the formula, the phase separation is changed from secondary to primary, and then from Z 1. In short, when wiring, take the head of the main winding as the center. If the head of the secondary winding is on the right side of the main winding, the steering is clockwise, and if it is on the left side, it is counterclockwise.
Second, the steering reversible type
This kind of motor is mostly used in occasions where positive and negative rotation alternate frequently, such as washing machines, ventilators, woodworking planers, etc. The primary and secondary windings are symmetrical, such as washing machine and ventilator, which are controlled by timer; If the primary and secondary windings are asymmetrical, such as woodworking planer, bench drill, etc., the reverse switch can be used to realize the positive and negative rotation control of the motor.
(1) Forward current analysis The forward transmission line is shown in the above figure.
Main winding: power supply fire → main winding head (U 1)→ main winding tail (U2)→ power supply neutral secondary winding: power supply fire → centrifugal switch (V 1)→ centrifugal switch (V2)→ starting capacitor → secondary winding head (Z 1)→ secondary winding tail (v2). Out; Secondary winding, first in and then out.
(2) Reverse current analysis Reverse wiring is shown in the figure below.
Main winding: power supply fire → main winding head (U 1)→ main winding tail (U2)→ power supply zero line.
Secondary winding: power supply fire → secondary winding tail (Z2)→ secondary winding head (Z 1)→ starting capacitor.
Centrifugal switch (V2)→ Centrifugal switch (V 1)→ Power neutral line.
Current law: primary winding, FIFO, secondary winding, LIFO.
When stopping, the current can't enter the reverse switch, the motor is dead, and the motor stops running.
In short, in actual production and life, single-phase asynchronous motors should be connected in many ways due to different load conditions, but as long as the wiring rules are mastered, they will be used freely and greatly improve work efficiency.