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Motor control device

A control device, motor technology, applied in the direction of single motor speed/torque control, current controller, electronic commutator, etc.

Inactive Publication Date: 2009-12-16
NIDEC SHIBAURA CORP
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Furthermore, the optimal phase angle control characteristic of the energization of the brushless DC motor 1 is also affected by the temperature of the brushless DC motor 1, but in the case of the conventional structure, it is impossible to perform advance angle control that takes such temperature influence into consideration.

Method used

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Experimental program
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Effect test

no. 1 approach

[0062] refer to Figure 1 ~ Figure 3 , the first embodiment applied to the control of the fan motor of the air conditioner will be described.

[0063] figure 1 is the block wiring diagram of the motor control device, and Figure 10 The difference from the previous device is that instead of Figure 10 The phase angle signal generation circuit 11 is provided with a phase adjustment circuit 18A.

[0064] phase adjustment circuit 18A as figure 2 As shown in the connection diagram, the circuit consists of multiple resistors R1~R4 and multiple diodes D1, D2 (the inflection point is approximated by a broken line with one point α) or, further, a combination of resistor R5, diodes D3, D4 is added Circuit (when the inflection point is approximated by a broken line of two points α, β). Then, the speed command voltage of the speed signal generation circuit 5 applied to the input terminal 181 is processed into a voltage having a broken-line approximation characteristic, and a phase an...

no. 2 approach

[0074] refer to figure 1 as well as Figure 4 , Figure 5 A second embodiment applied to the control of a washing machine motor as an example of a low-rotation high-torque motor will be described. Figure 4 is a wiring diagram of the phase adjustment circuit 18B, Figure 5 It is an explanatory diagram of the characteristics of the phase angle signal with respect to the rotational speed of the washing machine motor.

[0075] The motor control device of the present embodiment is configured by figure 1 The phase adjustment circuit 18A is replaced by Figure 4 The phase adjustment circuit 18B.

[0076] Furthermore, when the brushless DC motor 1 is a washing machine motor of a low-rotation high-torque type, the optimal phase angle control characteristic (the optimal phase of energization corresponding to the torque) corresponding to its rotational speed (speed of the brushless DC motor 1) The characteristic of the angle value) is Figure 5 The nonlinear characteristics of ...

no. 3 approach

[0085] refer to figure 1 as well as Image 6 , Figure 7 A third embodiment corresponding to the third aspect of the present invention will be described. Image 6 is a wiring diagram of the phase adjustment circuit 18C, Figure 7 It is an explanatory diagram of the characteristics of the phase angle signal with respect to the rotational speed of the fan motor.

[0086] This embodiment is configured to be applied to the control of the fan motor of the air conditioner similar to the first embodiment, and for the motor control device, the figure 1 The phase adjustment circuit 18A is replaced by Image 6 The phase adjustment circuit 18C.

[0087] phase adjustment circuit 18C with figure 2 The phase adjustment circuit 18A differs in that the resistor R2 of the phase adjustment circuit 18A is replaced by a positive temperature coefficient (PTC) thermistor Rth whose resistance value changes according to the temperature change of the brushless DC motor 1 .

[0088] In this c...

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Abstract

The present invention provides a motor control device, which realizes desired high-accuracy advanced angle control of brush-less DC motor with simple and low-cost structure. In the motor control device, a phase adjusting circuit is provided, which is composed of a combined circuit of resistances (R1-5) and diodes (D1-4), and processes the speed instruction into voltage similar to fold lien of optimum phase angle control characteristic corresponding to speed of the brush-less DC motor to form phase angle signal, and by adjusting the combination of resistances (R1-5) and diodes (D1-4), the speed instruction is processed into voltage similar to fold lien of optimum phase angle control characteristic corresponding to speed of the brush-less DC motor to form phase angle signal of the voltage corresponding to the optimum phase angle control characteristic, and execute high-accuracy advanced angle control for phase of power supply of the brush-less DC motor according to the phase angle signal.

Description

technical field [0001] The present invention relates to a motor control device for controlling the drive of a brushless DC motor, and specifically relates to improvement of a phase angle signal used as a reference for advance angle control of energization drive. Background technique [0002] Conventionally, brushless DC motors have been used in fan motors of air conditioners (hereinafter referred to as air conditioners) and washing machine motors as examples of low-rotation, high-torque motors. [0003] The current phase of such a brushless DC motor is delayed due to the influence of armature reaction, winding inductance, and the like. Therefore, using Figure 10 The shown known motor control device performs drive control with an advanced phase based on speed control based on a speed command voltage and phase angle control based on energization based on a phase angle signal. [0004] next, yes Figure 10 The motor control device is described. [0005] Figure 10 The brushl...

Claims

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Application Information

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IPC IPC(8): H02P6/14H02P6/16H02P6/06H02P6/08H02P6/15H02P6/17H02P6/28
Inventor 中川纮一
Owner NIDEC SHIBAURA CORP
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