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Adaptive holding current for electrically commutated electric motors

A technology of electric motor and current holding, applied in the deceleration device of DC motor, electronic commutation motor control, motor control and other directions, can solve problems such as adverse noise and electromagnetic radiation

Pending Publication Date: 2020-02-28
ELMOS SEMICON SE
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Furthermore, a number of iterative steps are performed in which the reduced holding current oscillates around the target value it needs to maintain the rotor position, which disadvantageously leads to noise and electromagnetic radiation

Method used

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  • Adaptive holding current for electrically commutated electric motors
  • Adaptive holding current for electrically commutated electric motors
  • Adaptive holding current for electrically commutated electric motors

Examples

Experimental program
Comparison scheme
Effect test

Embodiment Construction

[0054] Such as figure 1 As shown in , the control of a bipolar stepper motor 10 can be extended for adaptive hold-on. An adjustable holding current is fed by one of the two windings A or B, wherein the holding current is generated by at least one of the following methods:

[0055] - adjustable current source;

[0056] - Adjustable current sink;

[0057] - PWM-modulation with adjustable duty cycle; or,

[0058] - Chopper current control with adjustable current threshold.

[0059] A test current is modulated onto the second winding, the input energy of this test current being as low as possible, and the modulation of this test current is chosen to cause as little mechanical and acoustic disturbance as possible.

[0060] Common controls for bipolar stepper motors include final stages 12, 14, 16, and 18 connected to winding connections A0, A1, B1, B0, such as figure 1 shown in . figure 1 The structure of the final stage is shown as an example by means of the final stage 12 ....

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PUM

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Abstract

In a method for generating a blocking moment in a standstill state of an electrically commutated electric motor (10) having at least two windings (A, B, S12, S23, S31), on which electric motor a possibly varying load moment acts from outside in the standstill state, first, a blocking current is supplied at a maximum value into a first winding (A, B, S12, S23, S31). This blocking current is successively reduced to, possibly, a minimum value. From that moment the inductivity of the electric motor (10) is controlled, namely by controlling the blocking current if the control deviation between theactual value and the set value of the inductivity exceeds a predetermined threshold value. Thereby, it is possible to control the blocking current in an adaptive manner insofar as, despite a varying load moment, the standstill state of the electric motor (10) can be maintained by varying the blocking current.

Description

technical field [0001] The invention relates to a method and a device for generating a holding torque in a stationary state of an electrically commutated electric motor having at least two windings, in which a sometimes varying load torque acts on the electric motor from outside, the load torque not exceed the preset maximum value. In particular, the invention relates to generating a holding torque in the standstill state of a sensorless electric motor, in particular a sensorless stepper motor. Background technique [0002] Customer requirements for electrically adjustable drives (Stellantriebe) often include, in addition to the torque during normal or travel work, also holding torques, in which the adjusting drive must remain stationary when a load torque is applied from the outside, in standstill, up to the holding torque. In the case of electrically commutated motors with sensors for electrical commutation such as potentiometers, Hall sensors or in costly BLDC-motor sys...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H02P8/30H02P6/18H02P6/24
CPCH02P8/30H02P6/18H02P6/24H02P3/025H02P6/185H02P6/153H02P2203/01H02P3/08H02P6/28
Inventor 约尔格·哈茨池
Owner ELMOS SEMICON SE
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