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The Wheel-motor must remain ill-defined, since is inaccessible for casual inspection. Limited motor-data has been visually obtained; enough to identify the most likely manufacturer and motor-frame size, and from those data one may say that the Scooba wheels are powered with motors that are very much the same as those used in Roombas.
Upon disassembly of the Drive-Wheel Assembly, including removal of the Tachometer's Cap, small areas of the motor can be viewed through openings in the Wheel Assembly's housing. The best view is through the 10-mm diameter pivot-hole, as seen in Figure 1.
Figure 1. Limited View of Motor Provides Identity Clues
Looking through those holes, one of the first differences (from Roomba motors) is the use of a motor with a plastic end-plate (the end that supports the brush-holders); so that is one identifying datum. It is also possible to roughly judge the diameter and length of the motor. In fact its diameter could be measured by contacting the motor-housing through the forward and aft pivot holes. Not surprising, it is looking like one of the Mabuchi Motors variations.
We will have to go with that limited identification data, because if we try to remove the motor from its mounting, we find it is trapped in position by the pinion-gear, which has been press-fitted to its output shaft. A view of that situation is shown in the end-view of Figure 2. Notice that only one, of two provided, mounting screws is used to retain the motor.
Figure 2. A Press-Fit Pinion Gear Traps Motor in Place
Based on the estimated dimensions of the Wheel-motor, it was possible to sample options at Mabuchi's web-site, and thus converge on a most likely motor-frame candidate. That sorted out to be the basic RS365SA motor. It has an overall end-bell to end-plate length of 32.6-mm, and housing diameter of 27.7-mm. One difficulty: "RS365SA" defines only a generic form, such as the one with a plastic end-plate, and single-ended shaft, shown in Figure 3.
Figure 3. Candidate Mabuchi Motor
We are lacking all of the motor's 'features-tailoring' information. Existence of that information is signified by the A-suffix. Additionally, four or five digits follow the "A" to define parameters such as wire-size and number of turns per armature coil. None of that information is known. Naturally, we will never know what may be called out in the "A"-specification! One feature can be assumed, however, because this motor requires shaft-extensions at both ends -- and that would have to be especially requested by the OEM. As will be seen in the Tachometer section, the motor directly spins the optical-chopper wheel -- because the chopper mounts onto the motor's tail-shaft.
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