Rotary Technology

		Three-part rotary topology The three-part rotary electric encoder comprises a tooted dielectric rotor that rotates between two stationary printed boards. One board serves as a space/time modulated electric-field transmitter, and the other as a field receiver. The rotor interaction with the electric field is influenced by the shaft rotation angle. The received, integrated, field is converted to a proportional current which is processed to provide DC output signals, proportional to the Sine and Cosine of the shaft angle.
		Two-part rotary topology The two-part rotary electric encoder comprises a fixed stator board that includes field transmitting and receiving plates on its bottom side and processing electronics on its top side. The bottom side faces the rotor which in turn modulates and redirects the field. The received, integrated, field is converted to a proportional current which is processed to provide DC output signals proportional to the Sine and Cosine of the shaft angle.
		Rotary Electric Encoder Technology (PDF)