Control unit for controlling a synchronous motor
First Claim
1. A control unit for controlling a permanent-magnet-type synchronous motor incorporating a position sensor, the motor being connected to a power converter, comprising:
- a motor speed unit for determining the rotational speed of said motor based on a signal output from said position sensor;
a motor position unit for determining a magnetic polar position of said motor based on the signal output from said position sensor;
a position-sensor abnormality identifier means for detecting abnormalities in the signal output from said position sensor;
a first controlling means for generating voltage-instructing values for said power converter by utilizing the magnetic polar position determined by the motor position unit so as to cause a motor speed detection value detected by said motor speed unit to pursue a speed instruction value;
a second controlling means for generating voltage-instructing values having a magnitude and a phase corresponding to said speed instruction value by employing a magnetic polar position based on a frequency corresponding to said speed instruction value; and
a switching means for selecting either said first controlling means or said second controlling means so as to transmit voltage-instructing values generated by either of said controlling means to said power converter, wherein, when said position-sensor abnormality identifier detects that the signal output from said position sensor is normal, said switching means transmits voltage-instructing values from said first controlling means to said power converter and when said position-sensor abnormality identifier detects that the signal output from said position sensor is abnormal, said switching means transmits voltage-instructing values from said second controlling means to said power converter.
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Accused Products
Abstract
A control unit is provided that controls a motor that opens and closes a door of an electric train such that, if an abnormality is detected by a position sensor, continuation of its open/closing operation can be maintained. The control unit includes an arrangement for computing the actual rotation speed and the magnetic polar position of the motor; a position sensor abnormality-detecting identifier unit for detecting abnormalities in the output of the position sensor; and a first controlling arrangement that generates voltage-instructing values by applying the magnetic polar position so as to cause a speed detection value to correspond to the speed instruction value. The control unit further includes a second controlling arrangement, which in turn includes an F/V arithmetic unit 24 and integrator 25; and a switcher unit 27. The F/V arithmetic unit 24 generates a voltage instruction value having a specific magnitude and phase corresponding to the speed instruction value by utilization of magnetic polar position data that is obtained via integration of a frequency corresponding to the speed instruction value. The switcher unit 27 selects either of the first and second controlling arrangements so as to generate voltage-instructing values for a power converter 3. When the output of the position sensor is normal, the switcher unit 27 selects a specific voltage-instructing value delivered from the first controlling arrangement, whereas if the position of the sensor 5 is abnormal, the switcher unit 27 selects a specific voltage-instructing value delivered from the second controlling arrangement.
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Citations
3 Claims
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1. A control unit for controlling a permanent-magnet-type synchronous motor incorporating a position sensor, the motor being connected to a power converter, comprising:
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a motor speed unit for determining the rotational speed of said motor based on a signal output from said position sensor;
a motor position unit for determining a magnetic polar position of said motor based on the signal output from said position sensor;
a position-sensor abnormality identifier means for detecting abnormalities in the signal output from said position sensor;
a first controlling means for generating voltage-instructing values for said power converter by utilizing the magnetic polar position determined by the motor position unit so as to cause a motor speed detection value detected by said motor speed unit to pursue a speed instruction value;
a second controlling means for generating voltage-instructing values having a magnitude and a phase corresponding to said speed instruction value by employing a magnetic polar position based on a frequency corresponding to said speed instruction value; and
a switching means for selecting either said first controlling means or said second controlling means so as to transmit voltage-instructing values generated by either of said controlling means to said power converter, wherein, when said position-sensor abnormality identifier detects that the signal output from said position sensor is normal, said switching means transmits voltage-instructing values from said first controlling means to said power converter and when said position-sensor abnormality identifier detects that the signal output from said position sensor is abnormal, said switching means transmits voltage-instructing values from said second controlling means to said power converter. - View Dependent Claims (2, 3)
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Specification