Stepping motor driver
First Claim
1. a stepping motor driver comprising:
- an inverter for feeding stepped currents to windings of a stepping motor;
a position detection means for obtaining a detected angle of a rotor of said stepping motor; and
a current control means for controlling said inverter, wherein;
in a d-q rotational coordinate system in which the d-axis is in the direction of the magnetic flux of said rotor of said stepping motor and the q-axis is in the direction perpendicular to said d-axis, an excitation angle for a winding is determined from a d-axis component and a q-axis component of a command current to said winding;
a lead angle control signal is computed from said excitation angle; and
a phase of an applied voltage to said stepping motor is controlled using said lead angle control signal.
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Accused Products
Abstract
The stepping motor driver comprises an inverter for feeding stepped currents to windings of a stepping motor, a position detector for obtaining a detected angle of a rotor of the stepping motor and a current controller for controlling the inverter. In a d-q rotational coordinate system in which the d-axis is in the direction of the magnetic flux of the rotor and the q-axis is in the direction perpendicular to the d-axis, an excitation angle for a winding is determined from a d-axis component and a q-axis component of a command current to the winding, a lead angle control signal is computed from the excitation angle, and a phase of an applied voltage to the stepping motor is controlled using the lead angle control signal.
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Citations
17 Claims
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1. a stepping motor driver comprising:
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an inverter for feeding stepped currents to windings of a stepping motor;
a position detection means for obtaining a detected angle of a rotor of said stepping motor; and
a current control means for controlling said inverter, wherein;
in a d-q rotational coordinate system in which the d-axis is in the direction of the magnetic flux of said rotor of said stepping motor and the q-axis is in the direction perpendicular to said d-axis, an excitation angle for a winding is determined from a d-axis component and a q-axis component of a command current to said winding;
a lead angle control signal is computed from said excitation angle; and
a phase of an applied voltage to said stepping motor is controlled using said lead angle control signal. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8, 9, 10, 11, 12, 13, 14, 15, 16, 17)
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Specification