The motor MCA 30/64

The aim of this tutorial is the well-known washing machine motor. In particular, the model MCA 30/64 of the CE.SE.T. In addition to explaining the electrical meaning of the poles present in the connector, the possible motor power supply modes and how to connect it to speed regulators (MST_K07 and MST_K07_CL) will be described. The information presented in the tutorial can be extended to other similar engines with the acronym MCA. The photo shows the engine object of the tutorial.

This motor, used for washing machine, has the follwing  electric data:

 As shown in the photo, the motor is equipped with a 6-pole connector and an inductive speed sensor, coaxial with the rotation axis, which is used for speed control. The motor has a thermal protection (indicated with the P in the wiring diagram on the next page) that disconnects the motor electrically when it reaches a certain temperature following an effort or short circuit. The engine reaches a speed of 13000 rpm which is equivalent to 433 rps. It has a power of 420W with 2A of absorption. Being a universal motor, it can also be powered with a continuous voltage if the rotation speed is to be limited. (For safety it is always advisable to keep this DC voltage below 220 VDC).

The universal motor 

The motor in question is a brush motor belonging to the universal motor family. These motors are called Universal because they can work in both AC and DC. Furthermore they can be reversible or they can be reversed. The main feature is that the brushes, which act on the rotor manifold, are electrically connected in series to the stator windings. This ensures that the direction of rotation is determined as a function of the direction of the current passing through the stator windings, and therefore of the magnetic flux generated by it. Further information on electric motors can be viewed in the section tutorial categoria motori