Synchronous Motors

Can Stack step motors can be run as AC synchronous motors using a capacitance network as shown below. What is an AC Synchronous Motor? An AC Synchronous motors is constructed in the same basic way as the permanent magnet motor, but the coils have a resistance to enable proper operation when supplied by AC voltage through the capacitance network. Synchronous motors do not require the typical step motor controller but operate simply by the application of the AC voltage. This makes the motors ideal for applications where DC voltage is not readily accessible.

These motors run at a fixed speed and are well suited for continuous operation rather than intermittent duty (as is the case with step motors). The speed output of the motor is controlled by the number of pole pairs of the can stack motor in conjunction with the frequency of the voltage supply . For example, the speed of a 12 pole pair design run operated using a 50Hz supply will deliver 60 X 50/12 = 250rpm. At 60Hz the speed would therefore be 300 rpm.

Advantages of AC Synchronous Motors:-
• Operated from AC main supply
• Bi-directional operation simply by changing the connection of the capacitor
• Cost effective and long lasting
• Easy operation without special electronics or converters
• Standard features of our AC Synchronous Motors include:
• Running torques from 0.3 – 16 oz. in (0.38 – 115 mNm)
• AC supply voltages typically 24, 120 or 230 VAC
• Synchronous speeds from 250 rpm (300) to 500 rpm (600) (50 or 60Hz)

Synchronous motors