Sensorless motor driving device and its driving method

A motor drive and sensor technology, which is applied in the deceleration device of DC motor, starting device, AC motor control and other directions, can solve the problems of difficulty, difficulty in shortening time, and difficulty in starting sensorless motors quickly and reliably, and achieves rapid and reliable starting. Effect
CN1578104AInactive Publication Date: 2005-02-09コラボイノベーションズインコーポレイテッド
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Patent Information

Authority / Receiving Office
CN · China
Patent Type
Applications(China)
Current Assignee / Owner
コラボイノベーションズインコーポレイテッド
Publication Date
2005-02-09
Estimated Expiration
Not applicable · inactive patent

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Abstract

Sensorless motor driving device and its driving method. A PWM control section (1) gently changes phase currents (Iu, Iv, and Iw) under a current driving control over a pre-drive circuit (2) and an output circuit (3). The pre-drive circuit (2) suspends energizing of the specific motor coil (Mu, Mv, and Mw) according to a PWM disable signal (NPWM) at PWM disable periods. A self-commutation circuit (5) performs zero crossing detection according to a BEMF detection signal (DZC) during BEMF detection periods. A count section (7) selects either a self-commutation signal (SC) or a forced commutation signal (FC) as a commutation signal (CS), whichever enters earlier, and, based on its intervals, generates the PWM disable signal (NPWM) and the BEMF detection signal (DZC). The BEMF detection period starts after the start of the PWM disable period, and finishes together with the PWM disable period at the switching of the energization phases.
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Description

technical field

[0001] The present invention relates to a device and method for driving a sensorless motor, in particular to a device and method for controlling the state of a sensorless motor under forced commutation control. Background technique

[0002] In brushless motors, electrical commutation is used instead of mechanical commutation with brushes. Electrical commutation has requirements on the rotor position, that is, the rotation angle of the rotor. Conventional brushless motors are equipped with position sensors such as Hall devices and are used to detect rotor position. For example, see Japanese Patent Application Publication Nos. 2003-174789 and 2003-244983.

[0003] In a sensorless motor, the voltage induced in the motor coil during rotor rotation is detected. This voltage is hereinafter referred to as BEMF (Back Electromotive Force). Detection of rotor position using BEMF is performed without a position sensor. Since a sensorless motor has no position senso...

Claims

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