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An apparatus to produce accurately limited angular or pivotal movements of a shaft of a DC motor with a control circuit to supply appropriate signals to control the operation thereof. Position indicators are provided to detect the shaft position and a second indicator is located to detect a rearward

An apparatus to produce accurately limited angular or pivotal movements of a shaft of a DC motor with a control circuit to supply appropriate signals to control the operation thereof. Position indicators are provided to detect the shaft position and a second indicator is located to detect a rearward pivot position. Means are provided to establish a direction signal to indicate direction of rotation of the shaft, and the direction signal means and the position indicators produce outputs which are connected to the control circuit. The DC motor has a motor drive which receives signals from the control circuit during movement of the motor between forward and rearward pivot positions. The control circuit produces, first, an acceleration current and then a deceleration and finally a correction current with the current dropping to “zero”when the desired angular position has been reached by the shaft.

대표청구항 ▼

An apparatus for developing movements of a shaft about a limited angle and employing a DC motor comprising: first and second position indicators located at spaced-apart angular positions relative to the shaft; a motor drive having its output coupled to said DC motor to drive the same, means for esta

An apparatus for developing movements of a shaft about a limited angle and employing a DC motor comprising: first and second position indicators located at spaced-apart angular positions relative to the shaft; a motor drive having its output coupled to said DC motor to drive the same, means for establishing a direction signal indicative of the direction of rotation of said DC motor; said position indicators having means for generating output position signals to indicate an incorrect position of said DC motor; a control circuit; said direction signals and position signals being coupled to said control circuit and the output of the control circuit being coupled to said motor drive; and said control circuit producing, in response to said signals, an acceleration, deceleration and correction signal, said correction signal being developed for pivotal movement in either pivotal direction only when the shaft is in the region of either one of said first and second position indicators.