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Determining motor position

A motor, three-phase motor technology, applied in motor control, electronic commutation motor control, electrical components, etc., can solve problems such as poor accuracy and high noise, and achieve the effect of reducing acoustic noise and vibration

Active Publication Date: 2019-03-05
ALLEGRO MICROSYSTEMS INC
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, conventional IPD techniques are noisy in practice due to the torque generated during current injection
In addition, the accuracy may be poor because of the comparison of six closer signals

Method used

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  • Determining motor position
  • Determining motor position
  • Determining motor position

Examples

Experimental program
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Embodiment Construction

[0035] figure 1 An exemplary motor control circuit 102 is shown coupled to a motor 104 for providing BLDC motor starting using complementary drive and detection (CDD) in accordance with an exemplary embodiment of the present invention. The motor 104 is shown to include three windings 104a, 104b, 104c, which may be depicted as a corresponding equivalent circuit having an inductor in series with a resistor and in series with a back electromotive force (BEMF) voltage source. For example, winding A 104 a is shown to include inductor 130 in series with resistor 131 and in series with back EMF voltage source VA 136 . Combination below Figure 1A An exemplary equivalent circuit is more fully described.

[0036] The motor control circuit 102 includes a speed demand generator 107 coupled to receive an external speed demand signal 106 from outside the motor control circuit 102 . External speed demand signal 106 may be in one of a variety of formats. Generally, the external speed dem...

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Abstract

Methods and apparatus for determining a position of a rotor in motor, such as a three-phase motor by determining first and second ones of sectors in which a first one of the magnetic poles of the rotor may be positioned by driving phase pairs with complementary signals and examining a voltage of a floating one of the phases. Embodiments can further include driving first and second currents towardsthe first and second ones of the sectors and analyzing a time for each of the first and second currents to reach a threshold to identify a sector. Embodiments can further include applying torque to the motor by driving at least one phase pair with respective signals aligned in phase and unequal duty cycles to move the rotor for determining the position of the rotor.

Description

Background technique [0001] Circuits for controlling and driving brushless DC (BLDC) motors are known. Also know that it may be desirable to know where the motor is at start-up. Conventional BLDC motor control techniques can use BEMF (back electromotive force) information for position estimation, however, at zero speed, for example, when the motor starts, BEMF information is not available. Another common start-up technique is to drive the motor in open loop (eg, line up and run) without position estimation, which can cause reverse rotation during start-up. In addition, this technique may increase the starting time if a relatively conservative starting profile is selected, or make the motor start unreliable if an aggressive starting profile is selected. A known alternative technique for motor starting is called Initial Position Detection (IPD), commonly used in eg hard disk drives. Current is injected into six combinations of the three stator phases, one of the six combinati...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H02P6/18
CPCH02P6/18H02P2203/03H02P6/182
Inventor 吕一松L·安布鲁森
Owner ALLEGRO MICROSYSTEMS INC
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