Patent ID: 11860002
Assignee: NIDEC CORPORATION
Field: Electrical machinery, apparatus, energy (Electrical engineering)
Classification: CPC G  H | IPC G  H

Claim 0:
1. A position estimation device that estimates a position of a mover having a plurality of magnetic poles, the position estimation device comprising:
N (where N is an integer of 3 or more) sensors to detect magnetic fields created by the plurality of magnetic poles, the N sensors each outputting a detection signal having a magnitude which is in accordance with an intensity of a detected magnetic field, and the N sensors being disposed so that the N detection signals are displaced in phase by an angle which is 360 degrees/N;
a preprocessing circuit to generate N corrected detection signals from the N detection signals by decreasing a noise included in each of the N detection signals;
a signal processing circuit to generate and output a signal indicating an estimated position value of the mover based on the N corrected detection signals, the estimated position value of the mover corresponding to a rotation angle of the mover; and
a storage medium being connected to the signal processing circuit and having stored thereon a computer program to control an operation of the signal processing circuit;
first and second terminals to supply voltage to the N sensors; and
at least one resistor element connected between the first and second terminals in series connection with the sensors, wherein the sensors and the resistor element have temperature coefficients of a same positive or negative polarity, wherein
as a reference voltage value, the storage device stores the voltage value when acquiring measurement data which correspond to a movement amount of the mover; and
the preprocessing circuit reads the reference voltage value from the storage device, and corrects the N detection signals based on a current voltage value as acquired from a voltage measurement circuit and on the reference voltage value.