Detailed explanation of the forward and reverse rotation principle of single-phase dual-capacitor motor

How to distinguish the main and auxiliary windings and centrifugal switches of single-phase dual-capacitor motors

The single-phase dual-capacitor motor leads to 6 wires, with two capacitors and 6 wires, two wire ends for the start winding, two wire ends for the run winding, and two wire ends for the centrifugal switch. They each have a standard code, represented by Z, U for run, and V for centrifugal switch. On the wiring terminals, they are Z1, Z2, U1, U2, V1, and V2.

There are six lead wires in the motor. Set the multimeter to the lowest resistance level and measure two wires. If two wires have a resistance of 0 or the smallest resistance, they are the centrifugal switch leads. The remaining four wires have two wires with smaller resistances, which are the main winding leads, and the other two wires are the auxiliary winding leads. Example: The first group has a resistance of 2.6Ω and is marked green. The second group has a resistance of 5.9Ω and is marked blue. The third group has a resistance of 0.3Ω and is marked yellow. The largest resistance is the start winding (blue), the middle is the run winding (green), and the smallest resistance is the centrifugal switch (yellow), that is: start-up run > centrifugal switch.

Measuring main and auxiliary windings and centrifugal switches

Detailed explanation of the forward and reverse rotation principle of single-phase dual-capacitor motor

1. Principle of forward rotation:

Connect Z1 and U1 with a connecting piece, then connect Z2 and U2 with a connecting piece, and use wires to connect them to the live wire and neutral wire of the control switch respectively, which means forward rotation.

2. The principle of reversal:

To reverse, we just need to adjust the wiring method of the main winding or the secondary winding. The specific connection method is to connect Z1 and U2 with a connecting piece, then connect Z2 and U1 with a connecting piece, and then use wires to connect them to the live wire and neutral wire of the control switch respectively. This is reversal.

Principle explanation:

Single-phase capacitor motors, generally single-capacitor single-phase motors are used for motors below 500W, and double-capacitor single-phase motors are used for motors above 750W; one is the starting capacitor and the other is the running capacitor. The starting capacitor is used to increase the starting torque. After the motor reaches the rotation speed, the centrifugal switch on the motor is disconnected to remove the starting capacitor, and only the running capacitor works.