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FIELD WEAKENING OF BRUSHLESS PERMANENT MAGNET SERVOMOTORS WITH RECTANGULAR CURRENT
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| Author(s) |
G. Schaefer |
| Abstract |
For extension of speed and torque range of permanent excited brushless servomotors the principle of weakening the permanent field with a negativ d-axis current is used. The current control of sinusoidal-fed PM motors includes the control of the d-axis stator current and therefore it is simple to produce a negative d-axis stator current to weaken the permanent field of the motor. The control of the sinusodial-fed PM motor is rather complex because it needs two current regulators and a high resolution rotor position encoder. Rectangular-fed PM motor drives need only one current regulator and a simple rotor position encoder. A simple additional circuit prepoposes the switching points of the phase current in high speed region. This precommutation circuit enables the current regulator of the rectangular-fed PM motor to produce a negative d-axis current to weaken the permanent field of the motor. |
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| Filename: | Unnamed file |
| Filesize: | 4.045 MB |
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| Type |
Members Only |
| Date |
Last modified 2019-08-12 by System |
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