Flip Clock AC Motor

On my Sony 8FC-59W Digimatic, the AC motor, which drives the flip clock mechanism, was faulty, as it was not turning. I therefore had to take the motor out to determine what had gone wrong. I desoldered the motor wires and checked the resistance with a meter, however the coil was open. I therefore had to take the motor apart and gain access to the coil, which required rewinding. This was going to be time consuming, and costly, but it had to be done if I wanted to keep the originality.

The motor consists of two sections separated by a mounting plate. On one side, there is the rotor drum with red stripes on it. This is the part, which rotates the main shaft. The inside lining of the rotor drum has a thin strip of magnetic material, which they glue in place. On this side, there is also the main coil and the formers to direct the magnetic field.

In the middle is the separating and mounting plate, which mounts the assembly. The other side of this plate consists of the gearbox section. A train of plastic gears reduces the rotation of the output shaft.

On the gearbox side, you can see the output shaft, which has a black coloured plastic cam connected to it. The manual indicates that there is a hole on this side for introducing oil into the gearbox assembly, however it is only for some versions of this model.

There are these iron formers, which when you remove, reveal the coil.

There are these layers of formers that channel the magnetic flux, and after removing them, you can see that underneath there is a fixed bobbin of coil. On my one, the coil was open; hence, I had to get down to this level if I wanted to repair it. Many specialist shops can wind coils and I decided to send it off.

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