Method of changing speeds in a multi-polar electric motor of the

Details Method of changing speeds in a multi-polar electric motor of the Method of changing speeds in a multi-polar electric motor of the

1991-09-26

1994-05-10

Shoop, Jr., William M.

Electricity: motor control systems

Open loop speed control system for dc motor with commutator

Analog armature control

388934, 310148, H02P 7285

Patent

active

053116151

ABSTRACT:
The invention provides a method of commutation control, for changing the speed of a direct current electric motor of the constant flux type, having an encapsulated inductive winding with n poles, each of which is supplied by a separate brush. In this method, a speed at a level i, where i is in the range 1 to n-1 inclusive, is obtained by connecting a group of i+1 brushes to the terminal of the direct current supply source. The state of connection of the brushes is modified in accordance with a control characteristic which comprises modifying the composition of the group of i+1 brushes to be connected in order to obtain a motor speed at a predetermined level i, and/or by interrupting the connection of one of two consecutive brushes to the brush previously connected during a speed changing operation.

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