Multi-mode motor controller chip set

Details Multi-mode motor controller chip set Multi-mode motor controller chip set

2001-10-16

2004-02-17

Leykin, Rita (Department: 2837)

Electricity: motive power systems

Positional servo systems

Program- or pattern-controlled systems

C388S828000, C388S829000, C388S830000, C388S831000, C318S568100

Reexamination Certificate

active

06693400

ABSTRACT:

BACKGROUND OF THE INVENTION
This invention relates generally to motor controller circuits, and, more particularly, to a reconfigurable two-chip set motor controller.
Referring now to
FIG. 1
, a typical voice control motor (VCM)
16
is driven in a linear current mode in prior art motor controller configuration
10
. Driver circuit
12
includes a first amplifier
18
, a second amplifier
24
, and a sense amplifier
22
. The current, Im, driven into motor
16
is proportional to the control voltage, Vcmd, applied at circuit node
14
. In the steady state, the motor current, Im, is given by the following equation:
Im=
(
R
2
/
R
1
)×(
Vcmd/
(
Rs×As
))
where resistors R
1
, R
2
, and Rs are external to the driver circuit
12
and can be modified as required for a desired current gain for a specific application. The first amplifier
18
is used as an error amplifier, while the second amplifier
24
is used as a fixed gain stage. The control or command voltage Vcmd can be any value within a specified range and the commanded or motor current, Im, will be given by the above equation. System
10
shown above in
FIG. 1
is therefore continuous.
Referring now to
FIG. 2
, a compensated system
20
includes an external compensation circuit
26
to make the system stable. Compensation circuit is typically a simple passive circuit like a combination of a resistor and capacitor or other passive elements.
The driver circuit configurations
10
and
20
shown in
FIGS. 1 and 2
are typical for driving a VCM and the circuit elements must be changed to provide different operating modes, such as a pulsed mode of operation. While the circuit configurations
10
and
20
are simple and provide a stable operating system, it is inconvenient to change circuit elements to provide additional operating modes and restricts system versatility to adapt to changing load conditions.
What is desired, therefore, is a motor controller architecture that is easily reconfigurable for use in several operating modes and able to work in conjunction with a wide variety of controller circuits.
SUMMARY OF THE INVENTION
It is, therefore, a principal object of the present invention to provide a multi-mode motor controller architecture that is easily reconfigurable to operate in several modes and able to work in conjunction with a wide variety of controller circuits.
It is an advantage of the present invention that the motor can be driven in different modes without a need to change the circuit elements.
It is a further advantage of the present that new modes of operation can be evaluated or used in addition to established, conventional modes of operation.
According to the present invention a multi-mode motor controller architecture includes a motor, an integrated circuit controller, and an integrated circuit driver circuit. The integrated circuit controller includes a pulse generator, a DAC, an ADC, and a digital compensator circuit. The integrated circuit driver circuit is in communication with the controller and includes an error amplifier, first and second output amplifiers for driving the motor, and a sense amplifier. The motor controller architecture is configurable to operate in a linear mode, a pulsed mode, or a switchable linear/pulsed mode. The controller architecture can be implemented with external compensation circuitry, such as a resistor-capacitor circuit, or with the digital compensation circuitry located within the controller integrated circuit.
The foregoing and other objects, features and advantages of the invention will become more readily apparent from the following detailed description of a preferred embodiment of the invention which proceeds with reference to the accompanying drawings.


REFERENCES:
patent: 5289097 (1994-02-01), Erickson et al.
patent: 5838515 (1998-11-01), Mortazavi et al.

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