Speed regulation of DC motor using current sensing means

Claim 1

A system for control of a dc motor having an armature, a field and separately excited armature and field windings comprising: i) armature voltage amplifying means operatively connected to the armature winding of said motor for varying voltage applied thereto, ii) field current amplifying means operatively connected to the field winding of said motor for varying current flow through the field winding; iii) means for generating a signal representative of actual armature speed; iv) field current sensing means operatively connected to said field winding for sensing field current and for providing a signal representative thereof and being operatively connected to the means for generating a signal representative of actual armature speed; v) armature current sensing means adapted to be operatively connected to said armature winding for sensing armature current and for providing a signal representative thereof and being operatively connected to the means for generating a signal representative of actual armature speed; vi) the means for generating a signal representative of actual armature speed including means for receiving the signals representative of armature current and field current and in response to both said current signals, generating a signal representative of actual armature speed, vii) means for generating a reference signal representative of desired armature speed; viii) means receiving the signals representative of actual armature speed and desired armature speed and in response thereto, generating an armature control signal, the armature voltage amplifying means receiving the armature control signal and in response thereto, controlling the voltage applied to the armature winding of said motor to effect the desired armature speed; and ix) means for generating a field current control signal, the field current amplifying means receiving the field current control signal and in response thereto, controlling current flow through the field winding.

Claim 2

A system for control of a dc motor having an armature, a field and separately excited armature and field windings comprising: i) armature voltage amplifying means operatively connected to the armature winding of said motor for varying voltage applied thereto, ii) field current amplifying means operatively connected to the field winding of said motor for varying current flow through the field winding; iii) means for generating a signal representative of actual armature speed; iv) field current sensing means operatively connected to said field winding for sensing field current and for providing a signal representative thereof and being operatively connected to the means for generating a signal representative of actual armature speed; v) armature current sensing means adapted to be operatively connected to said armature winding for sensing armature current and for providing a signal representative thereof and being operatively connected to the means for generating a signal representative of actual armature speed; vi) the means for generating a signal representative of actual armature speed including means for receiving the signals representative of armature current and field current and in response to both said current signals, generating a signal representative of actual armature speed, vii) means for generating a reference signal representative of desired armature speed; viii) means receiving the signals representative of actual armature speed and desired armature speed and in response thereto, generating an armature control signal, the armature voltage amplifying means receiving the armature control signal and in response thereto, controlling the voltage applied to the armature winding of said motor to effect the desired armature speed; and ix) means for generating a field current control signal, the field current amplifying means receiving the field current control signal and in response thereto, controlling current flow through the field winding.

Claim 11

A method for controlling a dc motor having separately excited armature and field windings and operating said dc motor anywhere under its characteristic commutation curve limit, the method comprising the steps of: a) reading a signal representative of actual motor armature current; b) reading a signal representative of actual motor field current; c) deriving actual armature rotational speed as a function of actual motor armature current and actual motor field current, and generating a signal representative thereof; d) determining armature control effort as a function of said derived actual armature rotational speed; e) utilizing said armature control effort to control voltage applied to the armature winding; and f) repeating steps a) through e).

Claim 12

A method for controlling a dc motor having separately excited armature and field windings and operating said dc motor anywhere under its characteristic commutation curve limit, the method comprising the steps of: a) reading a signal representative of actual motor armature current; b) reading a signal representative of actual motor field current; c) deriving actual armature rotational speed as a function of actual motor armature current and actual motor field current, and generating a signal representative thereof; d) determining armature control effort as a function of said derived actual armature rotational speed; e) utilizing said armature control effort to control voltage applied to the armature winding; and f) repeating steps a) through e).