Drive unit for driving a stepping motor

Details Drive unit for driving a stepping motor Drive unit for driving a stepping motor

1992-05-15

1994-03-29

Shoop, Jr., William M.

Electricity: motive power systems

Positional servo systems

With particular motor control system responsive to the...

318696, G05B 1940

Patent

active

052988465

ABSTRACT:
In a rotation detecting unit for detecting rotation conditions such as a rotating position and speed of a stepping motor from a rotation signal of a motor without using any external sensor such as a potentiometer or encoder, by providing detection coils a and b to the main coils A, A', B, and B' provided at the stator of a stepping motor 2, the terminal voltages E2a and E2b outputted from the detection coils a and b are sequentially subjected to a signal processing in a rotation detecting circuit 1. The rotation detecting circuit 1 is provided with an output amplifier circuit 3, a signal processing circuit 4, a subtractive calculation circuit 5 for removing unnecessary voltage components by utilizing voltages E8A, E8A', E8B, and E8B' output from a charge/discharge circuit 8, a waveform shaping circuit 6 for converting the waveform of each input signal into waveforms processable in a digital form, a diagnosing circuit 7 for diagnosing whether the motor is rotating normally, and a control circuit 9' for controlling the motor in conformity with an output of the diagnosing circuit 7, whereby a superior stepping motor control can be achieved. By further providing an application voltage subtractive calculation circuit for a subtraction of application voltage components applied to the main coils A, A', B, and B', the rotation detecting coils a and b can be eliminated.

REFERENCES:
patent: Re31229 (1983-05-01), King
patent: 4608527 (1986-08-01), Glennon et al.
patent: 4734631 (1988-03-01), Kamikura et al.
patent: 4772841 (1988-09-01), Maruyama et al.

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